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tdma - cdma
(1643 results)-
White Papers
DiffServ Model With Backpressure for CDMA2000
Jun 2007
The nodes with shared-queues at the CDMA2000 data network have inherent rate mismatch and a single level of service. A core node, the Packet Control Function (PCF) is processing power limited....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A More Realistic Approach to Information - Theoretic Sum Capacity of Reverse Link CDMA Systems in a Single Cell
Jun 2007
In this paper, the authors discuss the information-theoretic approach to finding the pattern of transmission powers of the stations in a CDMA system which maximizes the aggregate capacity of the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Measuring WCDMA and HSDPA Delay Characteristics With QoSMeT
Jun 2007
Quality of Service (QoS) is becoming increasingly important with the rise of multimedia applications (e.g., Voice over IP (VoIP), video conferencing, online gaming, and Internet Protocol...
Provided by Institute of Electrical and Electronics Engineers
-
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
-
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
-
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
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
-
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
-
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
-
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
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
-
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
-
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
-
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
-
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
-
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
-
White Papers
Hybrid Power/Overlap Allocation Scheme for a Multirate Overlapped Optical CDMA System
Jun 2007
This paper addresses the problem of resource allocation in a multi-service optical network based on an Overlapped-CDMA system. A joint transmission power and overlapping coefficient (transmission...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Orthogonal En/Decoders for Truly Asynchronous Spectral Amplitude Encoded OCDMA
Jun 2007
In this paper, theoretical results are presented on the modular construction of orthogonal tree and cascade encoders/decoders of any size for truly asynchronous and cost-efficient spectral...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Time-and-Frequency-Hopping Optical Orthogonal Codes With Hierarchical Cross-Correlation Constraints for Service Differentiation
Jun 2007
In this paper, the authors consider Time-and-Frequency Hopping (TFH) codes for Optical Code-Division Multiple-Access (OCDMA) networks. To support the differentiated service requirements for...
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
Quadratic-Congruence Carrier-Hopping Prime Code for Multicode-Keying Optical CDMA
Jun 2007
In this paper, the authors studied a new family of the QC-CHPCs with expanded cardinality and the maximum cross-correlation value of two. The performance of the QC-CHPC in multicode-keying...
Provided by Institute of Electrical and Electronics Engineers
-
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
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
Pricing Strategies for Spectrum Lease in Secondary Markets
Aug 2009
The authors develop analytical models to characterize pricing of spectrum rights in cellular CDMA networks. Specifically, they consider a primary license holder that aims to lease its spectrum...
Provided by Boston University
-
White Papers
Handoff Triggering and Network Selection Algorithms for Load-Balancing Handoff in CDMA-WLAN Integrated Networks
Aug 2008
This paper proposes a novel vertical hand-off algorithm between WLAN and CDMA networks to enable the integration of these networks. The proposed vertical hand-off algorithm assumes a hand-off...
Provided by Texas A&M University
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White Papers
Subcarrier Group Assignment for MC-CDMA Wireless Networks
Nov 2007
Two interference-based subcarrier group assignment strategies in dynamic resource allocation are proposed for MC-CDMA wireless systems to achieve high throughput in a multi-cell environment. Least...
Provided by German University in Cairo
-
White Papers
Transmit Diversity at the Cell Border Using Smart Base Stations
Oct 2007
The authors address the problems at the most critical area in a cellular MultiCarrier Code Division Multiple Access (MC-CDMA) network, namely, the cell border. At a mobile terminal the diversity...
Provided by Hindawi Publishing
-
White Papers
Power-Controlled CDMA Cell Sectorization With Multiuser Detection: A Comprehensive Analysis on Uplink and Downlink
Oct 2007
The authors consider the joint optimization problem of cell sectorization, transmit power control and multiuser detection for a CDMA cell. Given the number of sectors and user locations, the cell...
Provided by Pennsylvania State University
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White Papers
A Study on Event-Driven TDMA Protocol for Wireless Sensor Networks
Nov 2010
MAC protocol controls the activity of wireless radio of sensor nodes directly so that it is the major consumer of sensor energy and the energy efficiency of MAC protocol makes a strong impact on...
Provided by Shanghai Jiao Tong University
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White Papers
Time of Arrival Estimation in Probability-Controlled Generalized CDMA Systems
Oct 2007
In recent years, more and more wireless communications systems are required to provide also a positioning measurement. In Code Division Multiple Access (CDMA) communication systems, the...
Provided by Hindawi Publishing
-
White Papers
On Intercell Interference and Its Cancellation in Cellular Multicarrier CDMA Systems
Sep 2007
The handling of intercell interference at the cell border area is a strong demand in future communication systems to guarantee efficient use of the available bandwidth. Therefore, this paper...
Provided by Hindawi Publishing
-
White Papers
WCDMA Uplink Interference Assessment From Multiple High Altitude Platform Configurations
May 2008
The authors investigate the possibility of multiple High Altitude Platform (HAP) coverage of a common cell area using a Wideband Code Division Multiple Access (WCDMA) system. In particular, they...
Provided by Hindawi Publishing
-
White Papers
Statistical Analysis of Multipath Fading Channels Using Generalizations of Shot Noise
Jul 2008
This paper provides a connection between the shot-noise analysis of Rice and the statistical analysis of multipath fading wireless channels when the received signals are a low-pass signal and a...
Provided by Hindawi Publishing
-
White Papers
Theoretical Analysis of Hole Punch Signal Conditioning for High Efficiency EER Power Amplifiers
Feb 2010
High efficiency and linearity can be achieved using Kahn's Envelope Elimination and Restoration (EER) technique. However, when used with modulation schemes such as Code Division Multiple Access...
Provided by Hindawi Publishing
-
White Papers
Assessment of Network Layouts for CDMA Radio Access
Jul 2008
The aim of this paper is to perform an overall comparison of different network layouts for CDMA-based cellular radio access. Cellular network layout, including base station site locations and...
Provided by Hindawi Publishing
-
White Papers
Novel Heuristics for Cell Radius Determination in WCDMA Systems and Their Application to Strategic Planning Studies
Aug 2009
The authors propose and compare three novel heuristics for the calculation of the optimal cell radius in mobile networks based on Wide-band Code Division Multiple Access (WCDMA) technology. The...
Provided by Hindawi Publishing
-
White Papers
A Near-Optimum Multiuser Receiver for STBC MC-CDMA Systems Based on Minimum Conditional BER Criterion and Genetic Algorithm-Assisted Channel Estimation
Mar 2011
The implementation of efficient base-band receivers characterized by affordable computational load is a crucial point in the development of transmission systems exploiting diversity in different...
Provided by Hindawi Publishing
-
White Papers
Transmitter Layering for Multiuser MIMO Systems
Feb 2008
A novel structure for multiple antenna transmissions utilizing space-time dispersion is proposed, where the original data stream is divided into K sub-streams which are modulated onto all...
Provided by Hindawi Publishing
-
White Papers
A Dynamic Utility Adaptation Framework for Efficient Multimedia Service Support in CDMA Wireless Networks
Aug 2010
In this paper, the problem of channel-aware opportunistic resource allocation for the down-link in code division multiple access wireless networks supporting simultaneously real-time multimedia...
Provided by Hindawi Publishing
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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
A Survey of Soft Handoff Prioritization Schemes in CDMA Cellular Networks
Apr 2011
Cellular communications systems require handoff to provide seem less service for users moving across cells. Code Division Multiple Access [CDMA] systems support soft handoff where a Mobile Station...
Provided by International Journal of Engineering Science and Technology
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White Papers
Reinforcement Learning for Dynamic Spectrum Management in WCDMA
Nov 2009
Low use of licensed spectrum imposes a need for the advanced spectrum management for wise spectrum usage with the release of unneeded frequency bands for the secondary markets and opportunistic...
Provided by Universitat Politecnica de Catalunya
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White Papers
Turbo Estimation and Equalization for Asynchronous Uplink MC-CDMA
Apr 2008
In this contribution, the authors propose a new code-aided synchronization and channel estimation algorithm for uplink MC-CDMA. The Space Alternating Generalized Expectation-maximization (SAGE)...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Opportunistic Cooperation for Quality of Service Provisionings Over Wireless Relay Networks
Jul 2007
The authors propose the QoS-driven opportunistic cooperation schemes for the wireless relay networks. By integrating information theory with the concept of effective capacity, their schemes aim at...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Cooperative Access in Wireless Networks: Stable Throughput and Delay
Jun 2011
The authors investigate the impact of a protocol-level cooperation idea in a wireless multiple access system. By dynamically and opportunistically exploiting spatial diversity among the N source...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Antenna Selection for Opportunistic Interference Management in MIMO Broadcast Channels
Apr 2010
Multi-user diversity scheme is an alternative approach to more traditional techniques like Time Division Multiple Access (TDMA) to increase the capacity of wireless cellular networks. The main...
Provided by UC Regents
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White Papers
The Problem of Sensing Unused Cellular Spectrum
May 2011
Sensing mechanisms that estimate the occupancy of wireless spectrum are crucial to the success of approaches based on Dynamic Spectrum Access. In this paper, the authors present key insights into...
Provided by Technische Universität Berlin
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White Papers
Space-Time Spreading MIMO-CDMA Downlink Systems Using Constrained Tensor Modeling
Apr 2008
This paper considers the downlink of a Multiple-Input Multiple-Output (MIMO) Code Division Multiple-Access (CDMA) system based on Space-Time Spreading (STS) using multiuser/multicode transmission....
Provided by Reed Elsevier
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White Papers
A Constrained Tensor-Based Approach for MIMO NL-CDMA Systems
Aug 2010
In this paper, the authors propose a deterministic tensor-based approach for joint channel and symbol estimation in the context of multiuser multi-antenna (MIMO) CDMA communication systems. They...
Provided by EURASIP
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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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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
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
-
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
-
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
-
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
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
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
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
-
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
-
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
-
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
-
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
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
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
Distributed Medium Access Control for Next-Generation CDMA Wireless Networks
Jun 2007
The next-generation wireless networks are expected to have a simple infrastructure with distributed control. In this paper, the authors consider a generic distributed network model for future...
Provided by Institute of Electrical and Electronics Engineers
-
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
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
-
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
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
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
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
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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
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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
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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
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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
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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
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
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
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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
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
Measuring WCDMA and HSDPA Delay Characteristics With QoSMeT
Jun 2007
Quality of Service (QoS) is becoming increasingly important with the rise of multimedia applications (e.g., Voice over IP (VoIP), video conferencing, online gaming, and Internet Protocol...
Provided by Institute of Electrical and Electronics Engineers
-
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
-
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
-
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
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
-
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
-
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
-
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
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
-
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
-
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
-
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
-
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
-
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
-
White Papers
Hybrid Power/Overlap Allocation Scheme for a Multirate Overlapped Optical CDMA System
Jun 2007
This paper addresses the problem of resource allocation in a multi-service optical network based on an Overlapped-CDMA system. A joint transmission power and overlapping coefficient (transmission...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Orthogonal En/Decoders for Truly Asynchronous Spectral Amplitude Encoded OCDMA
Jun 2007
In this paper, theoretical results are presented on the modular construction of orthogonal tree and cascade encoders/decoders of any size for truly asynchronous and cost-efficient spectral...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Time-and-Frequency-Hopping Optical Orthogonal Codes With Hierarchical Cross-Correlation Constraints for Service Differentiation
Jun 2007
In this paper, the authors consider Time-and-Frequency Hopping (TFH) codes for Optical Code-Division Multiple-Access (OCDMA) networks. To support the differentiated service requirements for...
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
Quadratic-Congruence Carrier-Hopping Prime Code for Multicode-Keying Optical CDMA
Jun 2007
In this paper, the authors studied a new family of the QC-CHPCs with expanded cardinality and the maximum cross-correlation value of two. The performance of the QC-CHPC in multicode-keying...
Provided by Institute of Electrical and Electronics Engineers
-
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
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
Pricing Strategies for Spectrum Lease in Secondary Markets
Aug 2009
The authors develop analytical models to characterize pricing of spectrum rights in cellular CDMA networks. Specifically, they consider a primary license holder that aims to lease its spectrum...
Provided by Boston University
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White Papers
Handoff Triggering and Network Selection Algorithms for Load-Balancing Handoff in CDMA-WLAN Integrated Networks
Aug 2008
This paper proposes a novel vertical hand-off algorithm between WLAN and CDMA networks to enable the integration of these networks. The proposed vertical hand-off algorithm assumes a hand-off...
Provided by Texas A&M University
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White Papers
Subcarrier Group Assignment for MC-CDMA Wireless Networks
Nov 2007
Two interference-based subcarrier group assignment strategies in dynamic resource allocation are proposed for MC-CDMA wireless systems to achieve high throughput in a multi-cell environment. Least...
Provided by German University in Cairo
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White Papers
Transmit Diversity at the Cell Border Using Smart Base Stations
Oct 2007
The authors address the problems at the most critical area in a cellular MultiCarrier Code Division Multiple Access (MC-CDMA) network, namely, the cell border. At a mobile terminal the diversity...
Provided by Hindawi Publishing
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White Papers
Power-Controlled CDMA Cell Sectorization With Multiuser Detection: A Comprehensive Analysis on Uplink and Downlink
Oct 2007
The authors consider the joint optimization problem of cell sectorization, transmit power control and multiuser detection for a CDMA cell. Given the number of sectors and user locations, the cell...
Provided by Pennsylvania State University
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White Papers
A Study on Event-Driven TDMA Protocol for Wireless Sensor Networks
Nov 2010
MAC protocol controls the activity of wireless radio of sensor nodes directly so that it is the major consumer of sensor energy and the energy efficiency of MAC protocol makes a strong impact on...
Provided by Shanghai Jiao Tong University
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White Papers
Time of Arrival Estimation in Probability-Controlled Generalized CDMA Systems
Oct 2007
In recent years, more and more wireless communications systems are required to provide also a positioning measurement. In Code Division Multiple Access (CDMA) communication systems, the...
Provided by Hindawi Publishing
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White Papers
On Intercell Interference and Its Cancellation in Cellular Multicarrier CDMA Systems
Sep 2007
The handling of intercell interference at the cell border area is a strong demand in future communication systems to guarantee efficient use of the available bandwidth. Therefore, this paper...
Provided by Hindawi Publishing
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White Papers
WCDMA Uplink Interference Assessment From Multiple High Altitude Platform Configurations
May 2008
The authors investigate the possibility of multiple High Altitude Platform (HAP) coverage of a common cell area using a Wideband Code Division Multiple Access (WCDMA) system. In particular, they...
Provided by Hindawi Publishing
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White Papers
Statistical Analysis of Multipath Fading Channels Using Generalizations of Shot Noise
Jul 2008
This paper provides a connection between the shot-noise analysis of Rice and the statistical analysis of multipath fading wireless channels when the received signals are a low-pass signal and a...
Provided by Hindawi Publishing
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White Papers
Theoretical Analysis of Hole Punch Signal Conditioning for High Efficiency EER Power Amplifiers
Feb 2010
High efficiency and linearity can be achieved using Kahn's Envelope Elimination and Restoration (EER) technique. However, when used with modulation schemes such as Code Division Multiple Access...
Provided by Hindawi Publishing
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White Papers
Assessment of Network Layouts for CDMA Radio Access
Jul 2008
The aim of this paper is to perform an overall comparison of different network layouts for CDMA-based cellular radio access. Cellular network layout, including base station site locations and...
Provided by Hindawi Publishing
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White Papers
Novel Heuristics for Cell Radius Determination in WCDMA Systems and Their Application to Strategic Planning Studies
Aug 2009
The authors propose and compare three novel heuristics for the calculation of the optimal cell radius in mobile networks based on Wide-band Code Division Multiple Access (WCDMA) technology. The...
Provided by Hindawi Publishing
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White Papers
A Near-Optimum Multiuser Receiver for STBC MC-CDMA Systems Based on Minimum Conditional BER Criterion and Genetic Algorithm-Assisted Channel Estimation
Mar 2011
The implementation of efficient base-band receivers characterized by affordable computational load is a crucial point in the development of transmission systems exploiting diversity in different...
Provided by Hindawi Publishing
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White Papers
Transmitter Layering for Multiuser MIMO Systems
Feb 2008
A novel structure for multiple antenna transmissions utilizing space-time dispersion is proposed, where the original data stream is divided into K sub-streams which are modulated onto all...
Provided by Hindawi Publishing
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White Papers
A Dynamic Utility Adaptation Framework for Efficient Multimedia Service Support in CDMA Wireless Networks
Aug 2010
In this paper, the problem of channel-aware opportunistic resource allocation for the down-link in code division multiple access wireless networks supporting simultaneously real-time multimedia...
Provided by Hindawi Publishing
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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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