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tdma - cdma
(1612 results)-
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
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
-
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
-
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
-
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
-
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
-
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
-
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
-
White Papers
Simultaneous Optimization for Dynamic Sensor Function Allocation and Effective Sensed Data Aggregation in Wireless Sensor Networks
Dec 2009
This paper proposes a method to realize sensor function allocation and effective data aggregation simultaneously in wireless sensor networks. This method realizes dynamic allocation of sensor...
Provided by University of Aizu
-
White Papers
Spectrally Efficient Four Dimensional M-ary QAM for Synchronous DS-CDMA
Aug 2010
Wireless mobile communication has found prolific use through a versatile and successful technology known as CDMA. Multiuser capability of CDMA is substantially higher than other fundamental...
Provided by International Journal of Engineering and Technology
-
White Papers
The Analysis of System Performance of An MC-CDMA System Over Two-Tier Femtocell Networks
Mar 2010
The paper is analyzing the evaluation of system performance for an MC-CDMA (Multi-Carrier Coded-Division Multiple-Access) system operating over two-tier femtocell environment. The considered...
Provided by Dayeh University
-
White Papers
Performance Study of BPSK and 8-PSK Using Cyclic Codes in CDMA Environment
Mar 2010
This paper highlights the performance of BPSK and 8-PSK in Code Division Multiple Access (CDMA) environment by using Cyclic Codes as the Forward Error Correction (FEC). This model consists of...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Implementation of Cordic Based Architecture for WCDMA/OFDM Receiver
Sep 2009
The communications industry is experiencing an explosion in the demand for Personal Communications Services (PCS). Telecommunications service providers and network operators are embracing the...
Provided by EuroJournals
-
White Papers
MMSE Receiver for Overloaded CDMA System
Apr 2011
Linear and nonlinear receiver structures based on Minimum Mean Square Error (MMSE) linear combiner and Minimum Mean Square Error-Decision Feedback Equalizer (MMSE-DFE) are proposed to mitigate the...
Provided by EuroJournals
-
White Papers
Performance Analysis of Multi-Carrier Code Division Multiple Access System Under Clipping Noise
Dec 2009
Future communication systems are based on Multi Carrier (MC) techniques for their robustness in presence of fading. Higher capacity and robustness to interference is another objective, which...
Provided by EuroJournals
-
White Papers
Multi-Objective Optimization Using the Bees Algorithm in Time-Varying Channel for MIMO MC-CDMA Systems
Jul 2009
This paper proposes novel application of the Bees algorithm to multi objective optimization problems for the uplink of a Multi Carrier Code Division Multiple Access (MCCDMA) system based on...
Provided by EuroJournals
-
White Papers
Abstract Model of Fault Tolerance Algorithm in Cloud Computing Communication Networks
Sep 2011
The authors discussed in this paper the modeling behavior of the cloud computing communication network through which processors exchange their messages. The goal is to develop an abstract...
Provided by Jaypee University of Information Technology
-
White Papers
FPGA Implementation of Software Defined Radio Model Based 16QAM
Aug 2009
Software Defined Radio (SDR) has emerged as a priority theme of research since it will substitute for conventional implementation on wireless communication system. In this paper, a multi-standards...
Provided by EuroJournals
-
White Papers
Reanalysis of BER for Wavelet Based MC-CDMA Communication
May 2011
As demand for higher data rates is continuously rising, there is always a need to develop more efficient wireless communication systems. In this paper, described the author efforts in this...
Provided by International Journal of Computer Science and Management Studies
-
White Papers
SAC-OCDMA With Zero Vector Combinatorial Code (ZVCC)
Aug 2011
In this paper the performance of the incoherent SAC-OCDMA system using Zero Vector Combinatorial Code (ZVCC) has been observed by varying the code length and data rate. ZVCC is better than the...
Provided by International Journal of Computer Science and Management Studies
-
White Papers
Link Scheduling Algorithms for Wireless Mesh Networks
Jan 2009
The authors provide an overview of link scheduling algorithms in Spatial Time Division Access (STDMA) wireless mesh networks. These algorithms can be classified into three categories: those based...
Provided by Indian Institute of Technology Bombay
-
White Papers
Power ControlMethods for Improving Spatial Reuse in TDMA-BasedWirelessMesh Networks
Jun 2011
Wireless Mesh Networks (WMNs) have attracted a great deal of interest in recent years as a cost-effective method to provide a wireless network infrastructure. To accommodate various types of...
Provided by Osaka University
-
White Papers
Modeling TDMA-Based USAP in JTRS MDL for Multicast and Unicast Traffic
Nov 2010
In this paper, the authors develop loss network models for the hard scheduling mode (virtual circuit mode) of the reservation-based USAP scheduling protocol as used in the Mobile Data Link (MDL)...
Provided by University of Maryland
-
White Papers
A Cooperative Dual Access Multi-Channel MAC Protocol for Ad Hoc Networks
Jun 2010
The authors present a multi-channel MAC protocol for ad hoc networks, for nodes equipped with a single half-duplex transceiver, combining the use of OFDMA and CDMA. To ease OFDMA channel...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Performance Analysis of the Quick Idle State Protocol of CDMA 1xEV-DO Rev. B Systems
Jun 2010
In this paper, the authors study the performance of Quick Idle State Protocol (QISP) introduced in CDMA 1xEV-DO Rev. B standard to enhance the battery life of Access Terminals (ATs) in the idle...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Efficient MAC Protocol for Ultra-Wideband Networks
Dec 2008
In this paper, the flow-level performance of opportunistic scheduling in Orthogonal Frequency Division Multiplexing (OFDM) networks is studied. The analysis accounts for the applications with a...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Cooperative Fair Scheduling for the Downlink of CDMA Cellular Networks
Jul 2007
In this paper, the authors study cooperation among the adjacent Base Stations (BSs) for downlink scheduling in code division multiple access cellular networks. They propose a cooperative fair...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Towards High Quality VoIP in 3G Networks an Empirical Approach
Nov 2008
Third Generation (3G) packet switched WCDMA networks with High-Speed Downlink Packet Access (HSDPA) are currently being deployed worldwide to provide wireless broadband connectivity. When...
Provided by Scientific Research Publishing
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White Papers
OCDMA/OCDMA Overloading Scheme for Cellular DS-CDMA Using Orthogonal Gold Codes and Complex Scrambling
Aug 2008
Overloading is a method to extend capacity limitation of multiple access techniques. The system becomes overloaded, when the number of users exceeds the signal dimensions. One of the efficient...
Provided by Scientific Research Publishing
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White Papers
Statistical Model of Downlink Power Consumption in Cellular CDMA Networks
Aug 2011
This paper proposes a theoretical statistical model of the downlink power consumption in cellular CDMA networks. The proposed model employs a simple but popular propagation model, which breaks...
Provided by University of Piraeus
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White Papers
An Efficient Hybrid Power Control Algorithm for Capacity Improvement of CDMA-Based Fixed Wireless Applications
Apr 2011
In Fixed Wireless Applications (FWA), the Code Division Multiple Access (CDMA) is the most promising candidate for wideband data access. The reason is the soft limit on the number of active mobile...
Provided by Seoul National University
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White Papers
Joint Iterative Channel Estimation and Data Detection for MIMO-CDMA Systems Over Frequency-Selective Fading Channels
Jun 2010
In this paper, the authors present an iterative joint channel estimation and data detection technique for Multiple-Input Multiple-Output (MIMO) Code-Division Multiple-Access (CDMA) systems over...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Opportunistic Spectrum Access to 3G Wireless CDMA Networks for Cognitive Radio
Aug 2011
In this paper, the authors deal with the scenario that a single Secondary User (SU) attempts to opportunistically access the 3G wireless CDMA networks licensed to Primary Users (PUs). Different to...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Characterization of CDMA2000 Cellular Data Network Traffic
Jan 2011
This paper describes the analysis of low-level measurements from a CDMA2000 1x cellular data network. The network traces record detailed information about wireless Internet packet data call...
Provided by University of Calgary
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White Papers
Fault Recovery and Redundancy in Real-Time Wireless TDMA
May 2008
This paper aims to address the issue of message delivery reliability in real-time, wireless communication systems. The authors discuss the provision of a probabilistic admissions control protocol...
Provided by Trinity College Dublin
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White Papers
Opportunistic Spectrum Sharing Schemes for CDMA-Based Uplink MAC in Cognitive Radio Networks
Apr 2011
The authors consider a wireless cognitive radio network in which a set of Secondary Users (SUs) opportunistically utilize the wireless spectrum licensed to the Primary Users (PUs) to transmit...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Energy Efficient Multichannel MAC Protocol for Cognitive Radio Ad Hoc Networks
Aug 2010
This paper presents a TDMA based energy efficient cognitive radio multi-channel Medium Access Control (MAC) protocol called ECR-MAC for wireless Ad Hoc Networks. ECRMAC requires only a single...
Provided by Cornell University
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White Papers
Optimal Channel-Aware ALOHA Protocol for Random Access in WLANs With Multipacket Reception and Decentralized Channel State Information
Jun 2008
Perfect decentralized Channel State Information (CSI) is utilized to design an optimal distributed Medium Access Control (MAC) protocol for Wireless Local Area Networks (WLANs) with the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Likelihood-Based Multiple Access for Estimation in Sensor Networks
Nov 2007
In recent years, there has been a renewed interest in designing efficient transmission schemes over Multiple Access Channels (MACs), also driven by the growing interest in effective communications...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Uplink Versus Downlink Wirless Mobile Positioning in UMTS Cellular Radio Systems
Jan 2011
A performance comparison between radio Location Positioning (LP) in Wide band Code Division Multiple Access (WCDMA), more precisely in UMTS FDD cellular phones, using the UpLink (UL) and Downlink...
Provided by Institut National des Telecommunications
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White Papers
On Fair Sharing of Spectrum Via CSMA
Oct 2009
The authors contrast CSMA and TDMA schemes for medium access in spatially dispersed wireless networks under the primary interference model. CSMA is based on random access via dynamically tuned...
Provided by Boston University
-
White Papers
TDMA Scheduling With Optimized Energy Efficiency and Minimum Delay in Clustered Wireless Sensor Networks
Jun 2010
In this paper, the authors propose a solution to the scheduling problem in clustered Wireless Sensor Networks (WSNs). The objective is to provide network-wide optimized Time Division Multiple...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Interference Avoidance Code Assignment Strategy for Downlink Multi-Rate MC-DS-CDMA With TF-Domain Spreading
Jul 2007
Frequency selective fading may affect the orthogonality of the spreading codes in the Multi-Carrier Direct Sequence Code Division Multiple Access (MC-DS-CDMA) systems. In this paper, the authors...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Resolving State Inconsistency in Distributed Fault-Tolerant Real-Time Dynamic TDMA Architectures
Sep 2011
State consistency in safety-critical distributed systems is mandatory for synchronizing distributed decisions as found in dynamic Time Division Multiple Access (TDMA) schedules in the presence of...
Provided by University of Waterloo
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White Papers
Semantics-Preserving Implementation of Synchronous Specifications Over Dynamic TDMA Distributed Architectures
Oct 2010
The authors propose a technique to automatically synthesize programs and schedules for hard real-time distributed (embedded) systems from synchronous data-flow models. Their technique connects the...
Provided by Association for Computing Machinery
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White Papers
Multi-User Joint Tx/Iterative Rx MMSE-FDE and Successive MUI Cancellation for Uplink DS-CDMA
Jul 2011
Uplink multi-user Direct Sequence-Code Division Multi-Access (DS-CDMA) suffers from strong Multi-User Interference (MUI) and self Inter-Chip Interference (ICI) caused by severe frequency-selective...
Provided by Tohoku University
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White Papers
Performance Analysis of Optimal Channel Estimation and Multiuser Detection in a Randomly-Spread CDMA Channel
Aug 2009
This paper analyzes performance of optimal channel estimation and MultiUser Detection (MUD) in a block-fading Code-Division Multiple-Access (CDMA) channel on the assumptions of random spreading...
Provided by Springer Science+Business Media
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White Papers
Asynchronous CDMA Systems With Random Spreading-Part I: Fundamental Limits
Nov 2009
Spectral efficiency for asynchronous Code Division Multiple Access (CDMA) with random spreading is calculated in the large system limit allowing for arbitrary chip waveforms and frequency-flat...
Provided by University of South Australia
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White Papers
Asynchronous CDMA Systems With Random Spreading-Part II: Design Criteria
Nov 2009
Totally asynchronous Code-Division Multiple-Access (CDMA) systems are addressed. In Part I, the fundamental limits of asynchronous CDMA systems are analyzed in terms of spectral efficiency and...
Provided by University of South Australia
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White Papers
Large-System Analysis of Joint Channel and Data Estimation for MIMO DS-CDMA Systems
Apr 2011
This paper presents a large-system analysis of the performance of joint Channel Estimation, MultiUser Detection, and per-user Decoding (CE-MUDD) for randomly-spread Multiple-Input Multiple-Output...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
CDMA Bus Based On-Chip Interconnect Infrastructure
Apr 2009
As technology scales toward deep submicron, the integration of complete System-on-Chip (SoC) designs consisting of large number of Intellectual Property (IP) blocks (cores) on the same silicon die...
Provided by University of Nis
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White Papers
A Low-Complexity Detector for Large MIMO Systems and Multicarrier CDMA Systems
Apr 2009
Multiple-Input Multiple-Output (MIMO) systems with multiple antennas at both transmitter and receiver sides have become very popular owing to the several advantages they promise to offer,...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Optimum Linear Decoding of Vector Quantisation Transmitted Over a CDMA Channel
Jan 2008
The problem of joint source-channel and multi-user decoding for code division multiple access channels is considered. The block source-channel encoder is defined by a Vector Quantiser (VQ). The...
Provided by Institution of Engineering and Technology
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White Papers
Jointly Optimal Signature Sequences and Power Allocation for CDMA Systems
Dec 2008
The problems of designing signature sequences and power allocation policy for Code-Division Multiple Access (CDMA) are important and have been the subject of intensive research in recent years....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Protocol Integration for Intelligent Monitoring Applications in Wireless Sensor Networks
Mar 2011
Integration of algorithms and protocols from different layers will make possible the deployment of large-scale wireless sensor networks which are the basis of interesting monitoring applications....
Provided by University of Castilla-La Mancha
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White Papers
Dynamic Control Slot Scheduling Algorithms for TDMA Based Mobile Ad Hoc Networks
Sep 2008
In this paper, the authors introduce two novel control slot scheduling approaches for creating dynamic contention free Time Division Multiple Access (TDMA) schedules. Their approaches are ideal...
Provided by Raytheon Company
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White Papers
Distributed Channel Access Scheduling for Ad Hoc Networks
Jan 2011
In this paper, the authors present and analyze protocols for Time-Division Multiple Access (TDMA) scheduling in ad hoc networks with omni-directional antennas. These protocols use a Neighbor-aware...
Provided by University of California
-
White Papers
On Cross Layer Congestion Control for CDMA-Based Ad-Hoc Networks
Dec 2007
The authors investigate a cross layer congestion control technique for TCP Reno-2 (NewReno) in CDMA-based wireless ad-hoc networks in which both TCP layer and PHY layer jointly control congestion....
Provided by Indian Institute of Technology Bombay
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White Papers
Power Optimal Signaling for Fading Multi-Access Channel in Presence of Coding Gap
Feb 2009
The authors consider a Gaussian multi-access fading channel with perfect Channel Side Information (CSI) at the transmitters and the receiver. This models many important practical systems including...
Provided by Indian Institute of Technology Bombay
-
White Papers
Localized QoS-Aware Media Access Control in High-Fidelity Data Center Sensing Networks
Oct 2010
Low-cost non-intrusive wireless sensor network is ideal for high-fidelity data center monitoring and helping improve energy efficiency. However, the stringent Quality of Service (QoS) requirements...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Collaborative Data Delivery in Energy-Synchronized Sensor Networks
Apr 2011
In an energy-synchronized sensor network, each sensor node needs to synchronize its duty-cycle with its residual energy (or energy harvesting rate) to meet a predefined network lifetime...
Provided by Georgia State University
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White Papers
Sensor Networks With Mobile Access: Optimal Random Access and Coding
Oct 2008
The authors consider random access and coding schemes for SEnsor Networks with Mobile Access (SENMA). Using an orthogonal Code-Division Multiple Access (CDMA) as the physical layer, an...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Wiener Feedback Filtering for Suppression of Residual ISI and Correlated Noise in MC-CDMA
Oct 2007
Multi-carrier CDMA takes advantage of frequency diversity by spreading each user symbol across multiple subcarriers to improve the transmission performance. However, the performance of linear...
Provided by Eindhoven University of Technology (TU/e)
-
White Papers
Design of a TDMA-Based Multi-Channel MAC Protocol for Wireless Sensor Networks
Apr 2011
In this paper, the authors propose a TDMA-based multi-channel Multiple Access Control (MAC) protocol for Wireless Sensor Networks (WSNs) and study its performance. The proposed protocol builds on...
Provided by University of Nis
-
White Papers
Cooperative Control of WCDMA System Under Geographically Congested Situations
Sep 2011
This paper extends recent developments in geographic load balancing techniques for cellular mobile communication systems using the Bubble Oscillation Algorithm (BOA), by investigating the...
Provided by Queen Mary, University of London
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White Papers
A Simulation Package for Hot-Spot Traffic Relief in WCDMA Networks
Oct 2009
This paper extends the previous study on geographic load balancing techniques for WCDMA networks using novel semi-smart antennas. The intelligent system can manage base stations' radio coverage...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
TREEFP: A TDMA-Based Reliable and Energy Efficient Flooding Protocol for WSNs
Apr 2011
Flooding a network with a message from the sink is required for many purposes like synchronization, code dissemination etc. While several flooding schemes exist, only a few are designed to achieve...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Energy-Efficient Wireless Sensor Networks: A Novel Dynamic Clustered and Cross-Layer Cooperation Approach
Oct 2011
In Wireless Sensor Networks (WSNs), energy efficiency is a foremost challenge. This paper studies energy-efficiency from cross-layer design in clustered WSNs. The authors propose a dynamic...
Provided by Nanjing University of Science & Technology
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White Papers
Cluster-Based Control Channel Allocation in Opportunistic Cognitive Radio Networks
Jun 2009
Cognitive Radio Networks (CRNs) involve extensive exchange of control messages, which are used to coordinate critical network functions such as distributed spectrum sensing, medium access, and...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Closed-Form BER Results for Multiple-Chip-Rate CDMA Systems Based on the Simplified Improved Gaussian Approximation
Jan 2008
The authors consider very general Code-Division Multiple Access (CDMA) systems, namely multiple-chip-rate CDMA systems, where signals can be transmitted at different chip rates, carrier...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Performance Evaluation of Five New Adaptive Contention Slot Allocators for IEEE 802.16 Based Systems
Feb 2009
A reservation based Medium Access Control (MAC) protocol has been adopted by the IEEE 802.16 standard as the basic protocol for data communication within the upstream channel. In this paper, the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Adaptive BLAST-Type Decision-Feedback Equalizers for DS-CDMA Systems
Jan 2011
In this paper, a new adaptive equalization scheme for time-varying and frequency selective channels in Direct Sequence Code Division Multiple Access (DS-CDMA) systems is proposed. It consists of a...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
VeMAC: A Novel Multichannel MAC Protocol for Vehicular Ad Hoc Networks
Apr 2011
This paper introduces VeMAC, a novel multichannel TDMA MAC protocol designed specifically for a vehicular ad hoc network. The network has one control channel and multiple service channels. On the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Cooperative Diversity Over Log-Normal Fading Channels: Performance Analysis and Optimization
Jul 2009
Although there has been a growing interest on cooperative diversity, the current literature is mainly limited to the results obtained for Rayleigh, Rician, or Nakagami fading channels. In this...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
On Asymptotic Efficiency for Asynchronous CDMA
Aug 2007
The authors consider asynchronous CDMA systems and analyze their performances in terms of asymptotic efficiency when linear receivers are employed and the system becomes overloaded. They show that...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Hybrid Noncooperative Game Model for Wireless Communications
Jan 2011
The authors investigate a hybrid non-cooperative game motivated by the practical problem of joint power control and Base Station (BS) assignment in Code Division Multiple Access (CDMA) wireless...
Provided by University of Illinois
-
White Papers
Power Control for Multicell CDMAWireless Networks: A Team Optimization Approach
Jan 2011
The authors study power control in multicell CDMA wireless networks as a team optimization problem where each mobile attains at the minimum its individual fixed target SIR level and beyond that...
Provided by University of Illinois
-
White Papers
Power-Delay Analysis of Consensus Algorithms on Wireless Networks With Interference
Dec 2009
The authors study the convergence of the average consensus algorithm in wireless networks in the presence of interference. For regular lattices with periodic boundary conditions, they characterise...
Provided by Inderscience Enterprises
-
White Papers
Delay Characterization of Multi-Hop Transmission in a Poisson Field of Interference
Mar 2011
The authors evaluate the end-to-end delay of a multi-hop transmission scheme that includes a source, a number of relays and a destination, in the presence of interferers located according to a...
Provided by University of Notre Dame
-
White Papers
Moment-Matched Lognormal Modeling of Uplink Interference With Power Control and Cell Selection
Mar 2010
The authors develop an alternate characterization of the statistical distribution of the inter-cell interference power observed in the uplink of CDMA systems. They show that the lognormal...
Provided by Institute of Electrical and Electronics Engineers
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
White Papers
Simultaneous Optimization for Dynamic Sensor Function Allocation and Effective Sensed Data Aggregation in Wireless Sensor Networks
Dec 2009
This paper proposes a method to realize sensor function allocation and effective data aggregation simultaneously in wireless sensor networks. This method realizes dynamic allocation of sensor...
Provided by University of Aizu
-
White Papers
Spectrally Efficient Four Dimensional M-ary QAM for Synchronous DS-CDMA
Aug 2010
Wireless mobile communication has found prolific use through a versatile and successful technology known as CDMA. Multiuser capability of CDMA is substantially higher than other fundamental...
Provided by International Journal of Engineering and Technology
-
White Papers
The Analysis of System Performance of An MC-CDMA System Over Two-Tier Femtocell Networks
Mar 2010
The paper is analyzing the evaluation of system performance for an MC-CDMA (Multi-Carrier Coded-Division Multiple-Access) system operating over two-tier femtocell environment. The considered...
Provided by Dayeh University
-
White Papers
Performance Study of BPSK and 8-PSK Using Cyclic Codes in CDMA Environment
Mar 2010
This paper highlights the performance of BPSK and 8-PSK in Code Division Multiple Access (CDMA) environment by using Cyclic Codes as the Forward Error Correction (FEC). This model consists of...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Implementation of Cordic Based Architecture for WCDMA/OFDM Receiver
Sep 2009
The communications industry is experiencing an explosion in the demand for Personal Communications Services (PCS). Telecommunications service providers and network operators are embracing the...
Provided by EuroJournals
-
White Papers
MMSE Receiver for Overloaded CDMA System
Apr 2011
Linear and nonlinear receiver structures based on Minimum Mean Square Error (MMSE) linear combiner and Minimum Mean Square Error-Decision Feedback Equalizer (MMSE-DFE) are proposed to mitigate the...
Provided by EuroJournals
-
White Papers
Performance Analysis of Multi-Carrier Code Division Multiple Access System Under Clipping Noise
Dec 2009
Future communication systems are based on Multi Carrier (MC) techniques for their robustness in presence of fading. Higher capacity and robustness to interference is another objective, which...
Provided by EuroJournals
-
White Papers
Multi-Objective Optimization Using the Bees Algorithm in Time-Varying Channel for MIMO MC-CDMA Systems
Jul 2009
This paper proposes novel application of the Bees algorithm to multi objective optimization problems for the uplink of a Multi Carrier Code Division Multiple Access (MCCDMA) system based on...
Provided by EuroJournals
-
White Papers
Abstract Model of Fault Tolerance Algorithm in Cloud Computing Communication Networks
Sep 2011
The authors discussed in this paper the modeling behavior of the cloud computing communication network through which processors exchange their messages. The goal is to develop an abstract...
Provided by Jaypee University of Information Technology
-
White Papers
FPGA Implementation of Software Defined Radio Model Based 16QAM
Aug 2009
Software Defined Radio (SDR) has emerged as a priority theme of research since it will substitute for conventional implementation on wireless communication system. In this paper, a multi-standards...
Provided by EuroJournals
-
White Papers
Reanalysis of BER for Wavelet Based MC-CDMA Communication
May 2011
As demand for higher data rates is continuously rising, there is always a need to develop more efficient wireless communication systems. In this paper, described the author efforts in this...
Provided by International Journal of Computer Science and Management Studies
-
White Papers
SAC-OCDMA With Zero Vector Combinatorial Code (ZVCC)
Aug 2011
In this paper the performance of the incoherent SAC-OCDMA system using Zero Vector Combinatorial Code (ZVCC) has been observed by varying the code length and data rate. ZVCC is better than the...
Provided by International Journal of Computer Science and Management Studies
-
White Papers
Link Scheduling Algorithms for Wireless Mesh Networks
Jan 2009
The authors provide an overview of link scheduling algorithms in Spatial Time Division Access (STDMA) wireless mesh networks. These algorithms can be classified into three categories: those based...
Provided by Indian Institute of Technology Bombay
-
White Papers
Power ControlMethods for Improving Spatial Reuse in TDMA-BasedWirelessMesh Networks
Jun 2011
Wireless Mesh Networks (WMNs) have attracted a great deal of interest in recent years as a cost-effective method to provide a wireless network infrastructure. To accommodate various types of...
Provided by Osaka University
-
White Papers
Modeling TDMA-Based USAP in JTRS MDL for Multicast and Unicast Traffic
Nov 2010
In this paper, the authors develop loss network models for the hard scheduling mode (virtual circuit mode) of the reservation-based USAP scheduling protocol as used in the Mobile Data Link (MDL)...
Provided by University of Maryland
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White Papers
A Cooperative Dual Access Multi-Channel MAC Protocol for Ad Hoc Networks
Jun 2010
The authors present a multi-channel MAC protocol for ad hoc networks, for nodes equipped with a single half-duplex transceiver, combining the use of OFDMA and CDMA. To ease OFDMA channel...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Performance Analysis of the Quick Idle State Protocol of CDMA 1xEV-DO Rev. B Systems
Jun 2010
In this paper, the authors study the performance of Quick Idle State Protocol (QISP) introduced in CDMA 1xEV-DO Rev. B standard to enhance the battery life of Access Terminals (ATs) in the idle...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Efficient MAC Protocol for Ultra-Wideband Networks
Dec 2008
In this paper, the flow-level performance of opportunistic scheduling in Orthogonal Frequency Division Multiplexing (OFDM) networks is studied. The analysis accounts for the applications with a...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Cooperative Fair Scheduling for the Downlink of CDMA Cellular Networks
Jul 2007
In this paper, the authors study cooperation among the adjacent Base Stations (BSs) for downlink scheduling in code division multiple access cellular networks. They propose a cooperative fair...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Towards High Quality VoIP in 3G Networks an Empirical Approach
Nov 2008
Third Generation (3G) packet switched WCDMA networks with High-Speed Downlink Packet Access (HSDPA) are currently being deployed worldwide to provide wireless broadband connectivity. When...
Provided by Scientific Research Publishing
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White Papers
OCDMA/OCDMA Overloading Scheme for Cellular DS-CDMA Using Orthogonal Gold Codes and Complex Scrambling
Aug 2008
Overloading is a method to extend capacity limitation of multiple access techniques. The system becomes overloaded, when the number of users exceeds the signal dimensions. One of the efficient...
Provided by Scientific Research Publishing
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White Papers
Statistical Model of Downlink Power Consumption in Cellular CDMA Networks
Aug 2011
This paper proposes a theoretical statistical model of the downlink power consumption in cellular CDMA networks. The proposed model employs a simple but popular propagation model, which breaks...
Provided by University of Piraeus
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White Papers
An Efficient Hybrid Power Control Algorithm for Capacity Improvement of CDMA-Based Fixed Wireless Applications
Apr 2011
In Fixed Wireless Applications (FWA), the Code Division Multiple Access (CDMA) is the most promising candidate for wideband data access. The reason is the soft limit on the number of active mobile...
Provided by Seoul National University
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White Papers
Joint Iterative Channel Estimation and Data Detection for MIMO-CDMA Systems Over Frequency-Selective Fading Channels
Jun 2010
In this paper, the authors present an iterative joint channel estimation and data detection technique for Multiple-Input Multiple-Output (MIMO) Code-Division Multiple-Access (CDMA) systems over...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Opportunistic Spectrum Access to 3G Wireless CDMA Networks for Cognitive Radio
Aug 2011
In this paper, the authors deal with the scenario that a single Secondary User (SU) attempts to opportunistically access the 3G wireless CDMA networks licensed to Primary Users (PUs). Different to...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Characterization of CDMA2000 Cellular Data Network Traffic
Jan 2011
This paper describes the analysis of low-level measurements from a CDMA2000 1x cellular data network. The network traces record detailed information about wireless Internet packet data call...
Provided by University of Calgary
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White Papers
Fault Recovery and Redundancy in Real-Time Wireless TDMA
May 2008
This paper aims to address the issue of message delivery reliability in real-time, wireless communication systems. The authors discuss the provision of a probabilistic admissions control protocol...
Provided by Trinity College Dublin
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White Papers
Opportunistic Spectrum Sharing Schemes for CDMA-Based Uplink MAC in Cognitive Radio Networks
Apr 2011
The authors consider a wireless cognitive radio network in which a set of Secondary Users (SUs) opportunistically utilize the wireless spectrum licensed to the Primary Users (PUs) to transmit...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
An Energy Efficient Multichannel MAC Protocol for Cognitive Radio Ad Hoc Networks
Aug 2010
This paper presents a TDMA based energy efficient cognitive radio multi-channel Medium Access Control (MAC) protocol called ECR-MAC for wireless Ad Hoc Networks. ECRMAC requires only a single...
Provided by Cornell University
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White Papers
Optimal Channel-Aware ALOHA Protocol for Random Access in WLANs With Multipacket Reception and Decentralized Channel State Information
Jun 2008
Perfect decentralized Channel State Information (CSI) is utilized to design an optimal distributed Medium Access Control (MAC) protocol for Wireless Local Area Networks (WLANs) with the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Likelihood-Based Multiple Access for Estimation in Sensor Networks
Nov 2007
In recent years, there has been a renewed interest in designing efficient transmission schemes over Multiple Access Channels (MACs), also driven by the growing interest in effective communications...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Uplink Versus Downlink Wirless Mobile Positioning in UMTS Cellular Radio Systems
Jan 2011
A performance comparison between radio Location Positioning (LP) in Wide band Code Division Multiple Access (WCDMA), more precisely in UMTS FDD cellular phones, using the UpLink (UL) and Downlink...
Provided by Institut National des Telecommunications
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White Papers
Tensor Coding for CDMA-MIMO Wireless Communication Systems
Sep 2011
In this paper, the authors propose a tridimensional tensor coding for Multiple-Input Multiple-Output (MIMO) communication systems. This coding allows spreading and multiplexing the transmitted...
Provided by EURASIP
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