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tdma - cdma
(1640 results)-
White Papers
Adaptive Ranging Code Allocation Scheme in IEEE 802.16 Networks
Dec 2010
IEEE 802.16 uses the Code Division Multiple Access (CDMA) method as the channel access method to decrease the collision probability of data delivery. However, IEEE 802.16 does not regulate a...
Provided by Hindawi Publishing
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White Papers
How Equalization Techniques Affect the TCP Performance of MC-CDMA Systems in Correlated Fading Channels
Nov 2007
This paper investigates the impact of several equalization techniques for multicarrier code division multiple access systems on the performance at both lower and upper layers (i.e., physical and...
Provided by Hindawi Publishing
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White Papers
BER Degradation of MC-CDMA at High SNR With MMSE Equalization and Residual Frequency Offset
Dec 2009
Multi-Carrier Code Division Multiple Access (MC-CDMA) is an attractive technique for high speed wireless data transmission in view of its advantages over orthogonal frequency division...
Provided by Hindawi Publishing
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White Papers
Employing LSF at Transmitter Eases MMSE Adaptation at Receiver in Asynchronous CDMA Systems
Dec 2008
In this paper, the authors have presented an efficient structure employing two kinds of optimal FIR filters, respectively, at the transmitter and the receiver for asynchronous CDMA systems. They...
Provided by Hindawi Publishing
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White Papers
Utilization-Based Dynamic Scheduling Algorithm for Wireless Mesh Networks
Oct 2010
Channel access scheduling is one of the key components in the design of multihop Wireless Mesh Networks (WMNs). This paper addresses the allocation/demand mismatch problem observed in oblivious...
Provided by Hindawi Publishing
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White Papers
Adaptive Cross-Layer Distributed Energy-Efficient Resource Allocation Algorithms for Wireless Data Networks
Jul 2008
The issue of adaptive and distributed cross-layer resource allocation for energy efficiency in uplink Code-Division Multiple-Access (CDMA) wireless data networks is addressed. The resource...
Provided by Hindawi Publishing
-
White Papers
Class-Based Fair Code Allocation with Delay Guarantees for OVSF-CDMA and VSF-OFCDM in Next-Generation Cellular Networks
Nov 2010
This paper presents a novel Class-based Fair Code Allocation (CFCA) protocol to support delay and rate guarantees for real-time flows and to provide fairness for non-real-time flows on the...
Provided by Hindawi Publishing
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White Papers
CDMA Transmission with Complex OFDM/OQAM
Aug 2007
The authors propose an alternative to the well-known Multi-Carrier Code-Division Multiple Access (MC-CDMA) technique for downlink transmission by replacing the conventional cyclic-prefix...
Provided by Hindawi Publishing
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White Papers
Sensitivity of Multicarrier Two-Dimensional Spreading Schemes to Synchronization Errors
Apr 2008
This paper presents the impact of synchronization errors on the performance of a downlink multicarrier two-dimensional spreading OFDM-CDMA system. This impact is measured by the degradation of the...
Provided by Hindawi Publishing
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White Papers
MAP Channel-Estimation-Based PIC Receiver for Downlink MC-CDMA Systems
Oct 2007
The authors propose a joint MAP channel estimation and data detection technique based on the Expectation Maximization (EM) method with Parallel Interference Cancelation (PIC) for downlink...
Provided by Hindawi Publishing
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White Papers
A New Iterated Local Search Algorithm for Solving Broadcast Scheduling Problems in Packet Radio Networks
Apr 2010
The Broadcast Scheduling Problem (BSP) in packet radio networks is a well-known NP-complete combinatorial optimization problem. The broadcast scheduling avoids packet collisions by allowing only...
Provided by Hindawi Publishing
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White Papers
DOA Estimation in the Uplink of Multicarrier CDMA Systems
Oct 2007
The authors consider the uplink of a Multi-Carrier Code-Division Multiple-Access (MC-CDMA) network and assume that the base station is endowed with a uniform linear array. Transmission takes place...
Provided by Hindawi Publishing
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White Papers
Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems With Optimal Combining and Partial Cancellation
Feb 2011
Symbol Error Rate (SER) of quadrature subbranch Hybrid Selection/Maximal-Ratio Combining (HS/MRC) scheme for 1-D modulations in Rayleigh fading under employment of the Generalized Receiver (GR),...
Provided by Hindawi Publishing
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White Papers
HSUPA Transport Network Congestion Control
Jun 2009
The introduction of High Speed Uplink Packet Access (HSUPA) greatly improves achievable uplink bitrate but it presents new challenges to be solved in the WCDMA radio access network. In the...
Provided by Hindawi Publishing
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White Papers
A QoS Multicast Routing in Wireless Mesh Networks
Jun 2010
Wireless Mesh Network (WMN) has recently emerged as a promising technology for next-generation wireless network. In WMNs, many important applications, such as audio/video conferencing, require the...
Provided by Wuhan University
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White Papers
Network Lifetime Optimization by Duality Approach for Multi-Source and Single-Sink Topology in Wireless Sensor Networks
Jun 2007
The Multi-Source and Single-Sink (MSSS) topology, in wireless sensor networks, is defined as the network topology, where all of nodes can gather, receive and transmit data to the sink. The authors...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A New Energy-Efficient Local Metric for Channel-Aware Geographic-Informed Forwarding (CAGIF) in Wireless Sensor Networks
Jun 2007
This paper proposes a new energy-efficient local metric, termed as Efficient Advancement Metric (EAM), for Channel Aware Geographic-Informed Forwarding (CAGIF) algorithm, which studies the optimal...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Cross-Layer Data Dissemination Protocol for Energy Efficient Sink Discovery in Wireless Sensor Networks
Jun 2007
This paper proposes a cross-layer protocol for energy-aware routing in wireless sensor networks. The protocol combines the energy depreciation rate, node distance and neighbourhood information...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Spreading Code MAC Protocol for Multi-Hop Wireless Ad Hoc Networks
Jun 2007
The authors propose a spreading code Medium Access Control (MAC) protocol with each node equipped with single transceiver for wireless ad hoc networks, based on the Code Division Multiple Access...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Maximal Lifetime Rate and Power Allocation for Sensor Networks With Data Distortion Constraints
Jun 2007
The authors address a lifetime maximization problem for a single-hop wireless sensor network where multiple sensors encode and communicate their measurements of a Gaussian random source to a...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Simulation and Evaluation of a Simple Adaptive Antenna Array for a WCDMA Mobile Communication
Aug 2011
This paper presents a uniform Linear Array model of a simple adaptive antenna array based on Signal-to-Interference and Noise Ratio (SINR) maximization. The SINR using the adaptive antenna array...
Provided by The Science and Information Organization
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White Papers
Video Transmission Over Cognitive Radio TDMA Networks Under Collision Errors
Aug 2011
Cognitive Radio (CR) networks are emerging as new paradigm of communication and channels sharing in multimedia and wireless networks. In this paper, the authors address the problem of video...
Provided by The Science and Information Organization
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White Papers
Bayesian Data Fusion for Asynchronous DS-CDMA Sensor Networks in Rayleigh Fading
Apr 2010
In this paper, the authors propose asynchronous non-orthogonal communication between distributed sensors and a data fusion center via asynchronous Direct-Sequence Code-Division Multiple Access...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Power Efficient Distributed Estimation in a Bandlimited Wireless Sensor Network
May 2008
The problem of distributed estimation of a nonrandom parameter in a Wireless Sensor Network (WSN) with, in general, correlated observations over a band-limited channel is addressed. Each...
Provided by University of New Mexico
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White Papers
Channel-Matched Spreading Codes for the Downlink of MC-CDMA
Jun 2007
This paper concerns the multiple access performance of spreading codes used in the downlink of Multi-Carrier Code-Division Multiple-Access (MC-CDMA). Complex-valued spreading codes, particularly...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Precoded Block-Spread CDMA With Maximum User Support and Frequency-Domain Equalization
Jun 2007
Code Division Multiple Access (CDMA) is a popular multiple access technique that is used to support multiple users simultaneously in a network. Many variants of CDMA exist, including Direct...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Iterative Interference Suppression for High-Rate Single-Carrier Space-Time Block-Coded CDMA
Jun 2007
In this paper, the authors employ Time-Reversal Space-Time Block Coding (TR-STBC) in single-carrier Direct Sequence Code-Division Multiple Access (DS-CDMA) block transmission in the presence of...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
TCP Performance of MC-CDMA Systems With Partial Equalization in Correlated Fading Channels
Jun 2007
This paper addresses the performance evaluation of multi-carrier code division multiple access systems both at physical and TCP levels. A partial equalization technique improving the performance...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Complexity Adjustable Scheduling Algorithm for Throughput Maximization in Clusterized TDMA Networks
Feb 2011
The authors consider clustered wireless networks, where transceivers in a cluster use a time-slotted mechanism (TDMA) to access a wireless channel that is shared among several clusters. Earlier...
Provided by Chalmers University of Technology
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White Papers
TSEEC - TS/TDMA Based Energy Efficient Congestion Control in Mobile Wireless Sensor Network
Oct 2011
In past few years, a remarkable change has been faced in the field of wireless sensor network - mobile sensor nodes. Congestion in the network and limited energy causes delay in the network. Due...
Provided by Bahria University
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White Papers
BER Enhancement of MIMO-CDMA Based on Space-Time Block Codes
Sep 2011
Now days, the demand for wireless communication systems with high data rates and high capacity has dramatically increased. CDMA (Code Division Multiple Access) plays an important role in modern...
Provided by G. Narayanamma Institute of Technology and Science
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White Papers
Frequency Domain Joint Estimation of Synchronization Parameter and Channel Impulse Response in Composite Radio Receiver
Jun 2007
In this paper, an innovative frequency domain joint estimation algorithm of synchronization parameter and Channel Impulse Response (CIR) in Direct Sequence Code Division Multiple Access (DS-CDMA)...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Improved DS-CDMA Multi-Stage PIC in Fading Channels Using a Generalized Soft Limiter
Jun 2007
In this paper, the authors examine performance of a multi-stage Parallel Interference Cancellation (PIC) receiver using a generalized soft limiter. The Generalized Soft Limiter (GSL) improves the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A New Approach for Mobile Localization in Multipath Scenarios
Jun 2007
In this paper, the authors consider the localization of a Mobile Station (MS) in Time Division Multiple Access (TDMA) based communication systems. They use joint angle and delay measurements of...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Simulative Analysis of a Multi-Cell Admission Control Algorithm in WCDMA Networks
Jun 2007
It has for long been recognized that in multi-cell Wide-band Code Division Multiple Access (WCDMA) networks the admission of a new session into the system can have undesirable impacts on the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Performance Analysis of Adaptive Rate Scheduling Scheme for 3G WCDMA Wireless Networks With Multi-Operators
Jun 2007
Sharing of 3G network infrastructure among operators offers an alternative solution to reducing the investment in the coverage phase of WCDMA. For Radio Access Network (RAN) sharing method each...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Basis Expansion Model and Doppler Diversity Techniques for Frequency Domain Channel Estimation and Equalization in DS-CDMA Systems
Jun 2007
In this paper, the authors propose a frequency domain adaptive estimation of Doppler shifts for multiple Doppler sub-paths in Direct Sequence Code Division Multiple Access (DS-CDMA) systems. By...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Joint Transmitter-Receiver Beamforming Over Space-Time Fading Channels
Jun 2007
The problem of joint transmitter and receiver beam-forming in the downlink DS-CDMA over multi-path fading channels is considered in this paper. The proposed investigation is based on the array...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Maximal Ratio Combining in Cellular MIMO-CDMA Downlink Systems
Jun 2007
In this paper, the authors first analyze the performance of Maximal Ratio Combining (MRC) scheme for Multiple Input Multiple Output (MIMO) in an interference-limited CDMA cellular system....
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Hybrid Flow-Control for CDMA2000
Jun 2007
A common 'Finite-burst' mode of wireless links scheduling in CDMA2000 has been shown to cause occupancy oscillations at the bottleneck shared-queue resulting with large overflow-based closely...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Optical CDMA Networks Using Different Detection Techniques and Coding Schemes
Sep 2011
This paper presents the comparative performance of different detection and coding schemes for Spectral-Amplitude-Coded Optical Code Division Multiple Access (SAC-OCDMA) system. SAC-OCDMA systems...
Provided by Indian School of Mines
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White Papers
A Novel ZCZ Code Based on M-Sequences and Its Applications in CDMA Systems
Jun 2007
In this paper, the authors propose a novel Zero-Correlation Zone (ZCZ) code, called m-ZCZ code. Both Auto-Correlation Function (ACF) side lobes and Cross-Correlation Function (CCF) of the code are...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Dynamic Conflict-Free Transmission Scheduling for Sensor Network Queries
May 2011
With the emergence of high data rate sensor network applications, there is an increasing demand for high-performance query services. To meet this challenge, the authors propose Dynamic...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Performance of Turbo Coded CDMA System With PPM Modulation on Optical Fiber
May 2010
Pulse Position Modulation (PPM) is a power efficient scheme that is used with IM/DD. In this paper, performance of an optical Code Division Multiple Access (CDMA) system with Turbo coding is...
Provided by Gautam Buddha University
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White Papers
Router Control Mechanism for Congestion Avoidance in CDMA Based IP Network
Dec 2010
Cellular wireless networks have become an indispensable part of the communications infrastructure. CDMA is an important air-interface technology for cellular wireless networks. Traditionally, in...
Provided by Sipnas college of Engineering & Technology
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White Papers
Mobile Broadband: Pricing and Services
Jun 2009
Although, the number of OECD countries that publish data on the number of mobile broadband subscribers is not large, growth is significant in markets where data are available. This paper provides...
Provided by OECD
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White Papers
Mitigation of Non-Linear Impairments of W-CDMA Power Amplifier
Dec 2010
In this paper a non-linear Power Amplifier (PA) with memory effects is modeled and a Digital pre-distortion algorithm is presented to mitigate non-linearity effects of a power amplifier. Look-Up...
Provided by Punjabi University
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White Papers
Integrating New Calls and Performance Improvement in Ovsf Based Cdma Networks
Jul 2011
In Code Division Multiple Access (CDMA), Orthogonal Variable Spreading Factor (OVSF) codes are used to allocate vacant codes when new calls arrive. In this paper, integration is done for...
Provided by Jaypee University of Information Technology
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White Papers
A Modular Encoder Design Scheme for Turbo-ncoded BPPM-OCDMA System
Jan 2009
A Turbo-encoded Optical Code Division Multiple Access (OCDMA) system has been simulated and an application specific design process has been proposed to implement a Turbo-encoded OCDMA modulated...
Provided by NORTH ATLANTIC UNIVERSITY UNION
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White Papers
OCDMA Indoor Wireless Communications System With Mobile Receiver
Mar 2011
In this paper, the authors consider an Optical Code Division Multiple Access (OCDMA) indoor wireless communication system using spectral encoding and evaluate its performances in cases of...
Provided by University Politehnica of Bucharest
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White Papers
A Cellular Neural Network and Utility-Based Radio Resource Scheduler for Multimedia CDMA Communication Systems
Mar 2010
The paper proposes a Cellular Neural Network and Utility (CNNU)-based radio resource scheduler for multimedia CDMA communication systems supporting differentiated Quality-of-Service (QoS). Here,...
Provided by IEEE
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White Papers
Reduced-Rank Adaptive Filtering Using Localized Processing for CDMA Systems
Oct 2008
An integrated beamforming (spatial processing) and multiuser-detection (temporal processing) scheme is an effective approach to increase system capacity but is also impractical due to the high...
Provided by IEEE
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White Papers
Fault Tolerance of Connectivity Performance in CDMA-Based Wireless Sensor Networks
Jul 2007
The Wireless Sensor Networks (WSN) consisted of many tiny nodes with sensing, storing and communicating capability have recently emerged as a hot research topic. In the WSN, the data is collected...
Provided by Springer
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White Papers
Interference Management for DS-CDMA Systems Through Closed-Loop Power Control, Base Station Assignment, and Beamforming
Jun 2010
In this paper, the authors propose a Smart Step closed-loop Power Control (SSPC) algorithm and a Base Station Assignment method based on Minimizing the Transmitter Power (BSA-MTP) technique in a...
Provided by Scientific Research Publishing
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White Papers
Joint Centralized Power Control and Cell Sectoring for Interference Management in CDMA Cellular Systems in a 2D Urban Environment
Aug 2010
The interference reduction capability of cell sectoring and power control algorithms have been considered separately as means to decrease the interference in Code Division Multiple Access (CDMA)...
Provided by Scientific Research Publishing
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White Papers
A New Watermarking Approach - Combined RW/CDMA in Spatial and Frequency Domain
Jul 2011
In this paper, the authors study some watermarking methods and the comparison result of their combination, the first one is based on the CDMA (Code Division Multiple Access) in frequency domain...
Provided by International Journal of Computer Science and Telecommunications
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White Papers
TDMA Over WiFi: Providing Strict QoS in WiFi Mesh Networks
Dec 2010
Though there have been several TDMA MAC implementations, but there is still lack of detailed performance evaluation, in a realistic setting, of a generic TDMA MAC protocol for mesh networks which...
Provided by Association for Computing Machinery
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White Papers
REX: A Randomized EXclusive Region Based Scheduling Scheme for mmWave WPANs With Directional Antenna
Feb 2010
Millimeter-wave (mmWave) transmissions are promising technologies for high data rate (multi-Gbps) Wireless Personal Area Networks (WPANs). In this paper, the authors first introduce the concept of...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Fast Convergence Least-Mean-Square Algorithms for MMSE Receivers in DS-CDMA Systems
Jun 2010
This paper considers a Minimum Mean-Squared Error (MMSE) single user adaptive receiver for the asynchronous Direct-Sequence Code-Division Multiple-Access (DS-CDMA) system, based on the...
Provided by University Politehnica of Bucharest
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White Papers
A Linear Multi-User Detector for STBC MCCDMA Systems Based on the Adaptive Implementation of the Minimum-Conditional Bit- Error-Rate Criterion and on Genetic Algorithmassisted MMSE Channel Estimation
Jul 2008
The implementation of efficient baseband receivers characterized by affordable computational load is a crucial point in the development of transmission systems exploiting diversity in different...
Provided by University of Trento
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White Papers
An Adaptive, High Performance MAC for Long-Distance Multihop Wireless Networks
Sep 2008
The authors consider the problem of efficient MAC design for long-distance WiFi-based mesh networks. In such networks it is common to see long propagation delays, the use of directional antennas,...
Provided by Association for Computing Machinery
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White Papers
A Test-Based Scheduling Protocol (TBSP) for Periodic Data Gathering in Wireless Sensor Networks
Jul 2010
The authors propose TBSP, a TDMA protocol for gathering information periodically from multiple data sources to a central location across multiple hops. TBSP incurs a lower overhead than the...
Provided by Imperial College London
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White Papers
Randomized Scheduling Algorithm for Data Aggregation in Wireless Sensor Networks
Feb 2010
The authors consider a wireless sensor network in which a routing tree has been established to transmit the information from a set of source nodes to a data sink. The existing algorithms to...
Provided by Imperial College London
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White Papers
Optimum Diversity-Multiplexing Tradeoff in the Multiple Relays Network
Sep 2007
In this paper, a multiple-relay network in considered, in which K single-antenna relays assist a single-antenna transmitter to communicate with a single-antenna receiver in a half-duplex mode. A...
Provided by University of Waterloo
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White Papers
Routing for Minimum Length Schedule in Multi-Channel TDMA Based Wireless Mesh Networks
Sep 2010
In TDMA based wireless mesh networks, routing and scheduling algorithms are essential to provide QoS support for mesh clients. In order to maximize the network throughput and minimize session...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
SINR Prediction in Mobile CDMA Systems by Linear and Nonlinear Artificial Neural-Network-Based Predictors
Jul 2011
This paper describes linear and nonlinear Artificial Neural Network (ANN)-based predictors as Autoregressive Moving Average models with Auxiliary input (ARMAX) process for Signal to Interference...
Provided by Islamic Azad University
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White Papers
SpaceOrthogonal FrequencyTime Medium Access Control (SOFT MAC) for VANET
May 2009
The IEEE is working on a MAC standard (802.11p) for VANET based on 802.11e. Although the access function of 802.11e supports QoS by using different backoff counters and interframe spaces for...
Provided by University of Plymouth
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White Papers
CoRe-MAC: A MAC-Protocol for Cooperative Relaying in Wireless Networks
Mar 2009
Cooperative relaying protocols introduce overhead due to relay selection and resource reservation compared to non-cooperative transmission which needs to be at least compensated by its benefits....
Provided by University of Klagenfurt
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White Papers
Distributed Broadcast Scheduling in Mobile Ad Hoc Networks
May 2010
Data and control messages broadcasting is a widely used mechanism in network applications and protocols, which can have latency requirements for the information delivery. One solution to achieve...
Provided by Universidade Federal do Rio de Janeiro
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White Papers
Low-Energy, Adaptive, and Distributed MAC Protocol for Wireless Sensor-Actuator Networks
Jan 2011
Sensor-actuator networks are often limited in battery capacity and processing power. Therefore, it is exigent to develop solutions that are both energy and delay efficient. In this paper, the...
Provided by Institut Eurecom
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White Papers
Effects of Subcarrier Power Allocation on an Interference Avoidance Code Assignment Strategy for Multirate MC-DS-CDMA Systems
Mar 2010
In this paper, the authors propose a joint Subcarrier Power Allocation (SPA) and code assignment scheme for the synchronous multi-rate Multi-Carrier Direct-Sequence Code-Division Multiple-Access...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Joint Power and Rate Assignment Algorithm for Multirate Soft Handoffs in Mixed-Size WCDMA Cellular Systems
Mar 2010
This paper proposes a Joint Power and Rate Assignment (JPRA) algorithm to deal with multi-rate Soft Hand-Offs (SHOs) in mixed-size wideband code division multiple access cellular systems. This...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Technical-Economic Evaluation of Spectrum Regimes: Static, Dynamic and Utopian Allocations for B3G CDMA With Coexisting UWB Devices
Jun 2007
The technical-economic performances of static (traditional) and auction-driven dynamic radio-spectrum allocation (FSA and DSA), and of a utopian "Federated" network (with all spectrum and...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Power Allocation Through Revenue-Maximising Pricing on a CDMA Reverse Link Shared by Energy-Constrained and Energy-Sufficient Heterogeneous Data Terminals
Apr 2009
The authors perform market-oriented management of the reverse link of a CDMA cell populated by data terminals, each with its own data rate, channel gain, Willingness To Pay (WTP), and link-layer...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Power Allocation for Social Benefit Through Price-taking Behaviour on a CDMA Reverse Link Shared by Energy-Constrained and Energy-Sufficient Data Terminals
May 2009
The authors allocate power to maximise "Social benefit" in the uplink of a CDMA cell populated by data terminals, each with its own data rate, channel gain, Willingness To Pay (WTP), and linklayer...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Efficient Channel-Estimation-Based Multiuser Detection for Underwater CDMA Systems
Oct 2008
Motivated by finding reduced complexity versions of the Maximum-Likelihood (ML) detector for highly distorted underwater channels, a MultiUser Detection (MUD) algorithm for joint data detection...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Uplink Capacity and Interference Avoidance for Two-Tier Cellular Networks
Dec 2007
Two-tier femtocell networks-comprising a conventional macrocellular network plus embedded femtocell hotspots-offer an economically viable solution to achieving high cellular user capacity and...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
CDMA Uplink Capacity in Both Open and Closed Access Two-Tier Femtocell Networks
Aug 2010
Femtocells are assuming an increasingly important role in cellular coverage. Femtocells can be configured to be either open access or closed access. Seemingly, the network operator would prefer an...
Provided by University of Texas
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White Papers
Femtocell Access Control in the TDMA/OFDMA Uplink
Jul 2010
This paper investigates open vs. closed access in the uplink of femtocell networks, for the particular case of orthogonal multiple access protocols like TDMA or OFDMA. Open access reduces near-far...
Provided by University of Texas
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White Papers
Multiuser Antenna Partitioning for Cellular MIMO - CDMA Systems
Sep 2007
Improving the capacity of Code-Division-Multiple-Access (CDMA) systems through advanced signal processing has been an area of intensive research for many years, with limited success. Multi-antenna...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
BER Degradation of MC-CDMA at High SNR With MMSE Equalization and Residual Frequency Offset
Dec 2009
Multi-Carrier Code Division Multiple Access (MC-CDMA) is an attractive technique for high speed wireless data transmission in view of its advantages over orthogonal frequency division...
Provided by Hindawi Publishing
-
White Papers
Employing LSF at Transmitter Eases MMSE Adaptation at Receiver in Asynchronous CDMA Systems
Dec 2008
In this paper, the authors have presented an efficient structure employing two kinds of optimal FIR filters, respectively, at the transmitter and the receiver for asynchronous CDMA systems. They...
Provided by Hindawi Publishing
-
White Papers
Utilization-Based Dynamic Scheduling Algorithm for Wireless Mesh Networks
Oct 2010
Channel access scheduling is one of the key components in the design of multihop Wireless Mesh Networks (WMNs). This paper addresses the allocation/demand mismatch problem observed in oblivious...
Provided by Hindawi Publishing
-
White Papers
Adaptive Cross-Layer Distributed Energy-Efficient Resource Allocation Algorithms for Wireless Data Networks
Jul 2008
The issue of adaptive and distributed cross-layer resource allocation for energy efficiency in uplink Code-Division Multiple-Access (CDMA) wireless data networks is addressed. The resource...
Provided by Hindawi Publishing
-
White Papers
Class-Based Fair Code Allocation with Delay Guarantees for OVSF-CDMA and VSF-OFCDM in Next-Generation Cellular Networks
Nov 2010
This paper presents a novel Class-based Fair Code Allocation (CFCA) protocol to support delay and rate guarantees for real-time flows and to provide fairness for non-real-time flows on the...
Provided by Hindawi Publishing
-
White Papers
CDMA Transmission with Complex OFDM/OQAM
Aug 2007
The authors propose an alternative to the well-known Multi-Carrier Code-Division Multiple Access (MC-CDMA) technique for downlink transmission by replacing the conventional cyclic-prefix...
Provided by Hindawi Publishing
-
White Papers
Sensitivity of Multicarrier Two-Dimensional Spreading Schemes to Synchronization Errors
Apr 2008
This paper presents the impact of synchronization errors on the performance of a downlink multicarrier two-dimensional spreading OFDM-CDMA system. This impact is measured by the degradation of the...
Provided by Hindawi Publishing
-
White Papers
MAP Channel-Estimation-Based PIC Receiver for Downlink MC-CDMA Systems
Oct 2007
The authors propose a joint MAP channel estimation and data detection technique based on the Expectation Maximization (EM) method with Parallel Interference Cancelation (PIC) for downlink...
Provided by Hindawi Publishing
-
White Papers
A New Iterated Local Search Algorithm for Solving Broadcast Scheduling Problems in Packet Radio Networks
Apr 2010
The Broadcast Scheduling Problem (BSP) in packet radio networks is a well-known NP-complete combinatorial optimization problem. The broadcast scheduling avoids packet collisions by allowing only...
Provided by Hindawi Publishing
-
White Papers
DOA Estimation in the Uplink of Multicarrier CDMA Systems
Oct 2007
The authors consider the uplink of a Multi-Carrier Code-Division Multiple-Access (MC-CDMA) network and assume that the base station is endowed with a uniform linear array. Transmission takes place...
Provided by Hindawi Publishing
-
White Papers
Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems With Optimal Combining and Partial Cancellation
Feb 2011
Symbol Error Rate (SER) of quadrature subbranch Hybrid Selection/Maximal-Ratio Combining (HS/MRC) scheme for 1-D modulations in Rayleigh fading under employment of the Generalized Receiver (GR),...
Provided by Hindawi Publishing
-
White Papers
HSUPA Transport Network Congestion Control
Jun 2009
The introduction of High Speed Uplink Packet Access (HSUPA) greatly improves achievable uplink bitrate but it presents new challenges to be solved in the WCDMA radio access network. In the...
Provided by Hindawi Publishing
-
White Papers
A QoS Multicast Routing in Wireless Mesh Networks
Jun 2010
Wireless Mesh Network (WMN) has recently emerged as a promising technology for next-generation wireless network. In WMNs, many important applications, such as audio/video conferencing, require the...
Provided by Wuhan University
-
White Papers
Network Lifetime Optimization by Duality Approach for Multi-Source and Single-Sink Topology in Wireless Sensor Networks
Jun 2007
The Multi-Source and Single-Sink (MSSS) topology, in wireless sensor networks, is defined as the network topology, where all of nodes can gather, receive and transmit data to the sink. The authors...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A New Energy-Efficient Local Metric for Channel-Aware Geographic-Informed Forwarding (CAGIF) in Wireless Sensor Networks
Jun 2007
This paper proposes a new energy-efficient local metric, termed as Efficient Advancement Metric (EAM), for Channel Aware Geographic-Informed Forwarding (CAGIF) algorithm, which studies the optimal...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Cross-Layer Data Dissemination Protocol for Energy Efficient Sink Discovery in Wireless Sensor Networks
Jun 2007
This paper proposes a cross-layer protocol for energy-aware routing in wireless sensor networks. The protocol combines the energy depreciation rate, node distance and neighbourhood information...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Spreading Code MAC Protocol for Multi-Hop Wireless Ad Hoc Networks
Jun 2007
The authors propose a spreading code Medium Access Control (MAC) protocol with each node equipped with single transceiver for wireless ad hoc networks, based on the Code Division Multiple Access...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Maximal Lifetime Rate and Power Allocation for Sensor Networks With Data Distortion Constraints
Jun 2007
The authors address a lifetime maximization problem for a single-hop wireless sensor network where multiple sensors encode and communicate their measurements of a Gaussian random source to a...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Simulation and Evaluation of a Simple Adaptive Antenna Array for a WCDMA Mobile Communication
Aug 2011
This paper presents a uniform Linear Array model of a simple adaptive antenna array based on Signal-to-Interference and Noise Ratio (SINR) maximization. The SINR using the adaptive antenna array...
Provided by The Science and Information Organization
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White Papers
Video Transmission Over Cognitive Radio TDMA Networks Under Collision Errors
Aug 2011
Cognitive Radio (CR) networks are emerging as new paradigm of communication and channels sharing in multimedia and wireless networks. In this paper, the authors address the problem of video...
Provided by The Science and Information Organization
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White Papers
Bayesian Data Fusion for Asynchronous DS-CDMA Sensor Networks in Rayleigh Fading
Apr 2010
In this paper, the authors propose asynchronous non-orthogonal communication between distributed sensors and a data fusion center via asynchronous Direct-Sequence Code-Division Multiple Access...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Power Efficient Distributed Estimation in a Bandlimited Wireless Sensor Network
May 2008
The problem of distributed estimation of a nonrandom parameter in a Wireless Sensor Network (WSN) with, in general, correlated observations over a band-limited channel is addressed. Each...
Provided by University of New Mexico
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White Papers
Channel-Matched Spreading Codes for the Downlink of MC-CDMA
Jun 2007
This paper concerns the multiple access performance of spreading codes used in the downlink of Multi-Carrier Code-Division Multiple-Access (MC-CDMA). Complex-valued spreading codes, particularly...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Precoded Block-Spread CDMA With Maximum User Support and Frequency-Domain Equalization
Jun 2007
Code Division Multiple Access (CDMA) is a popular multiple access technique that is used to support multiple users simultaneously in a network. Many variants of CDMA exist, including Direct...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Iterative Interference Suppression for High-Rate Single-Carrier Space-Time Block-Coded CDMA
Jun 2007
In this paper, the authors employ Time-Reversal Space-Time Block Coding (TR-STBC) in single-carrier Direct Sequence Code-Division Multiple Access (DS-CDMA) block transmission in the presence of...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
TCP Performance of MC-CDMA Systems With Partial Equalization in Correlated Fading Channels
Jun 2007
This paper addresses the performance evaluation of multi-carrier code division multiple access systems both at physical and TCP levels. A partial equalization technique improving the performance...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Complexity Adjustable Scheduling Algorithm for Throughput Maximization in Clusterized TDMA Networks
Feb 2011
The authors consider clustered wireless networks, where transceivers in a cluster use a time-slotted mechanism (TDMA) to access a wireless channel that is shared among several clusters. Earlier...
Provided by Chalmers University of Technology
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White Papers
TSEEC - TS/TDMA Based Energy Efficient Congestion Control in Mobile Wireless Sensor Network
Oct 2011
In past few years, a remarkable change has been faced in the field of wireless sensor network - mobile sensor nodes. Congestion in the network and limited energy causes delay in the network. Due...
Provided by Bahria University
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White Papers
BER Enhancement of MIMO-CDMA Based on Space-Time Block Codes
Sep 2011
Now days, the demand for wireless communication systems with high data rates and high capacity has dramatically increased. CDMA (Code Division Multiple Access) plays an important role in modern...
Provided by G. Narayanamma Institute of Technology and Science
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White Papers
Frequency Domain Joint Estimation of Synchronization Parameter and Channel Impulse Response in Composite Radio Receiver
Jun 2007
In this paper, an innovative frequency domain joint estimation algorithm of synchronization parameter and Channel Impulse Response (CIR) in Direct Sequence Code Division Multiple Access (DS-CDMA)...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Improved DS-CDMA Multi-Stage PIC in Fading Channels Using a Generalized Soft Limiter
Jun 2007
In this paper, the authors examine performance of a multi-stage Parallel Interference Cancellation (PIC) receiver using a generalized soft limiter. The Generalized Soft Limiter (GSL) improves the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A New Approach for Mobile Localization in Multipath Scenarios
Jun 2007
In this paper, the authors consider the localization of a Mobile Station (MS) in Time Division Multiple Access (TDMA) based communication systems. They use joint angle and delay measurements of...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Simulative Analysis of a Multi-Cell Admission Control Algorithm in WCDMA Networks
Jun 2007
It has for long been recognized that in multi-cell Wide-band Code Division Multiple Access (WCDMA) networks the admission of a new session into the system can have undesirable impacts on the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Performance Analysis of Adaptive Rate Scheduling Scheme for 3G WCDMA Wireless Networks With Multi-Operators
Jun 2007
Sharing of 3G network infrastructure among operators offers an alternative solution to reducing the investment in the coverage phase of WCDMA. For Radio Access Network (RAN) sharing method each...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Basis Expansion Model and Doppler Diversity Techniques for Frequency Domain Channel Estimation and Equalization in DS-CDMA Systems
Jun 2007
In this paper, the authors propose a frequency domain adaptive estimation of Doppler shifts for multiple Doppler sub-paths in Direct Sequence Code Division Multiple Access (DS-CDMA) systems. By...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Joint Transmitter-Receiver Beamforming Over Space-Time Fading Channels
Jun 2007
The problem of joint transmitter and receiver beam-forming in the downlink DS-CDMA over multi-path fading channels is considered in this paper. The proposed investigation is based on the array...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Maximal Ratio Combining in Cellular MIMO-CDMA Downlink Systems
Jun 2007
In this paper, the authors first analyze the performance of Maximal Ratio Combining (MRC) scheme for Multiple Input Multiple Output (MIMO) in an interference-limited CDMA cellular system....
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Hybrid Flow-Control for CDMA2000
Jun 2007
A common 'Finite-burst' mode of wireless links scheduling in CDMA2000 has been shown to cause occupancy oscillations at the bottleneck shared-queue resulting with large overflow-based closely...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Reliability-Based Partial Parallel Interference Cancellation and Iterative Decoding for DS-CDMA Over Fading Channels
Jun 2007
Multistage Partial Parallel Interference Cancellation (PPIC) is proposed for Turbo-encoded DS-CDMA systems where the partial cancellation factors are derived based on the Log-Likelihood Ratios...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Uplink-Downlink Imbalance in Wireless Cellular Networks
Jun 2007
Uplink-Downlink imbalance is a characteristic of all wireless networks which greatly impacts system performance, and must be accounted for in system design and simulation. However this property...
Provided by Institute of Electrical and Electronics Engineers
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