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tdma - cdma
(1644 results)-
White Papers
A Fast Bandwidth Request and Grant Method for IEEE 802.16 OFDMA/TDD Systems
Nov 2011
In the design of a contention-based bandwidth request scheme, decrease in data transmission delay is the most important factor. This paper proposes a new CDMA-based bandwidth request method in...
Provided by IARIA
-
White Papers
DS-CDMA Receiver in Software Defined Radio Technology
Jul 2011
Programmable radio is one of the latest trends in the construction of multi-standard receivers. The technology, called Software Defined Radio (SDR), is also an ideal test platform that allows to...
Provided by IARIA
-
White Papers
A Solution for Seamless Video Delivery in WLAN/3G Networks
Jul 2011
In this paper, the authors introduce a Session Proxy (SP) into a scenario in which Wireless Local Area Network (WLAN) and 3th Generation of networks cellular (3G networks) are integrated using...
Provided by IARIA
-
White Papers
Performance Analysis of Receive Collaboration in TDMA-Based Wireless Sensor Networks
Jul 2011
This paper presents a general framework to enable the implementation of receive collaboration in Wireless Sensor Networks (WSN). The framework also allows the evaluation of Collaborative Channel...
Provided by IARIA
-
White Papers
An Integrated Cluster-Based Multi-Channel MAC Protocol for Mobile Ad Hoc Networks
Nov 2007
This paper proposes a novel joint clustering and multi-channel Medium Access Control (MAC) protocol for mobile ad hoc networks, based on a scalable two-phase coding scheme. It employs the...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
A Divergence Minimization Approach to Joint Multiuser Decoding for Coded CDMA
Apr 2008
In this paper, a theoretical framework of Divergence Minimization (DM) is applied to derive iterative receiver algorithms for coded CDMA systems. The DM receiver obtained performs joint channel...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Seamless Handover Between CDMA2000 and 802.11 WLAN Using MSCTP
Apr 2012
The invention of mobile devices such as laptops, hand-held computers, and cellular phones has changed the whole Internet world. The main feature of mobile devices is that they can access the...
Provided by Universal Association of Computer and Electronics Engineers
-
Whitepapers
Case Study: How Cumulus Media Took Control of Telecom and Slashed Costs
May 2012
For Cumulus Media, a string of 100 acquisitions resulted in a chaotic array of carriers, calling plans and features. Rather than a manageable group of core service providers and carriers, the...
Provided by Cass Information Systems
-
White Papers
A New Hybrid Approach for Heterogeneous Radio Access Technology Selection
Jan 2012
Over the past twenty years, a number of wireless technologies were developed. The first generation systems are based on analog radio transmission. The Second Generation systems 2G brought a number...
Provided by Science Publications
-
White Papers
MPR-Aware Performance Improvement for Inter-Domain Routing in MANETs
Aug 2011
Inter-domain routing for MANETs (Mobile Ad Hoc NETworks) draws increasing attention in military and civil application. It works on heterogeneous networking protocols, including different MAC layer...
Provided by University of California
-
White Papers
Medium Access for a Military Narrowband Wireless Ad-Hoc Network; Requirements and Initial Approaches
Sep 2008
This paper presents the initial requirements for a tactical military MANET and their implications on the design of a Medium Access Control (MAC) protocol. The main focus is on TDMA based mobile...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Performance Analysis of Multi-User Multi Input Multi Output-Interleave-Division Multiple-Access System Employing Turbo Coding With Multi-User Detection Over Frequency-Selective Wireless Communication Channel
Feb 2011
Code division multiple access system is the most widely used system for multi-user communications. But the performances of CDMA is limited by multiple access interference and inter symbol...
Provided by Science Publications
-
White Papers
Performance of MMSE Receiver Based Multi Input Multi Output-Interleave Division Multiple-Access System with Multi-user Detection Over Frequency Selective Wireless Communication Channel
Jun 2011
Code division multiple access system is the most widely used system for multi-user communications. But the performance of CDMA is limited by multiple access interference and inter symbol...
Provided by Science Publications
-
White Papers
CDMA Vs. OFDM- Comparison and Hybrid OFDM- The Solution for the Next Generation
May 2012
This paper investigates the effectiveness of OFDM and proven in other conventional (narrowband) commercial radio technologies (e.g. DS-CDMA in cell phones) (e.g. OFDM in IEEE 802.11a/g). The main...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Throughput Analysis of Multi-Channel TD-CSMA System and Reinforcement Learning
May 2012
This paper generates a cognitive radio scenario based on non-persistent Carrier Sense Multiple Access (CSMA) and Time Division Multiple Access (TDMA) systems sharing a multi-channel wireless...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Weighted Code Transmission in Optical CMDA
Mar 2012
In this paper, the comparative analysis of a fibre optics CDMA system with or without weighted code is presented using Matlab simulation. By changing various parameters of the systems, the authors...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Construction and Performance Studies of a Pseudo-Orthogonal Code for Fiber Optic CDMA LAN
Jan 2012
A pseudo-orthogonal prime sequence code and a modified prime sequence code using the elements of Galoi's Field (GF) for a particular prime number have been developed. Bit-error rate performances...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Multimedia Networks Based Dynamic WCDMA System Proposal for Qos
Oct 2011
In WCDMA 3rd Generation (3G) systems although there is no need for frequency planning as the case with Second Generation (2G) systems, the limitation of both capacity and coverage by the...
Provided by Bansal Institute of Science and Technology
-
White Papers
WR Based Semi-Blind Channel Estimation for Frequency-Selective MIMO MC-CDMA Systems
Jan 2012
In this paper, the authors propose a novel Whitening-Rotation (WR) based Semi-Blind (SB) scheme for frequency-selective channel estimation in Multiple-Input Multiple-Output (MIMO) Multi-Carrier...
Provided by Indian Institute of Technology Kanpur
-
White Papers
Deterministic Formulization of SNR for Wireless Multiuser DS-CDMA Networks
Aug 2009
Wireless multiuser receivers suffer from their relatively higher computational complexity that prevents widespread use of this technique. In addition, one of the main characteristics of...
Provided by University of Bridgeport
-
White Papers
Multiuser Detection in Large-Dimension Multicode MIMO-CDMA Systems With Higher-Order Modulation
Jan 2012
In this paper, the authors are interested in high spectral efficiency multi-code CDMA systems with large number of users employing single/multiple transmit antennas and higher-order modulation. In...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Performance Comparison of Spatial Reused Bandwidth Reservation in Satellite Networks
Apr 2012
In this paper, the authors present a spatial reused bandwidth reservation scheme in Time Division Multiple Accesses (TDMA)-based uplink channel of satellite networks by using directional antennas....
Provided by AICIT
-
White Papers
A New Quantum Clone Genetic Algorithm Based Multi-User Detection for CDMA System
Dec 2011
Quantum intelligent computation has been widely drawing the attention of many researchers. Quantum clone genetic algorithm, which is based on quantum genetic algorithm and clone algorithm, is a...
Provided by AICIT
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White Papers
Relay-Assisted Partial Packet Recovery With IDMA Method in CDMA Wireless Network
Apr 2010
Automatic Repeat Request (ARQ) is an effective technique for reliable transmission of packets in wireless networks. In ARQ, however, only a few erroneous bits in a packet will cause the entire...
Provided by China University of Technology
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White Papers
Group-Based Block Linear Successive Interference Cancellation for DS-CDMA
Jun 2009
Mobile communication systems based on DS-CDMA suffer from Multiple Access Interference (MAI), which limits the system capacity. Several techniques, such as beamforming with multiple antennas and...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Group-Based Linear Parallel Interference Cancellation for DS-CDMA Systems
Jun 2009
The increase in the demand for voice and data wireless services creates a need for a more efficient use of the available bandwidth. Current and future generations cellular systems based on DS-CDMA...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Use of Turbo Codes With Low-Rate Convolutional Constituent Codes in Fingerprinting Scenarios
Sep 2011
The authors discuss the use of turbo codes in fingerprinting schemes. More precisely, they present a family of turbo codes that are secure against attacking coalitions of size 2. This family is...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
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Whitepapers
MCMAC: An Optimized Medium Access Control Protocol for Mobile Clusters in Wireless Sensor Networks
Jul 2010
Wireless Sensor Networks (WSNs) are developing into a promising solution for many applications, for example in healthcare. In many scenarios, there is some form of node mobility. The Medium Access...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Outage-Based Rate Maximization in CDMA Wireless Networks
Oct 2008
The problem of maximizing the sum of the transmit rates while limiting the outage probability below an appropriate threshold is investigated for networks where the nodes have limited processing...
Provided by University of California
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Whitepapers
A Generalized Utility Maximization Problem With Outage Constraints in CDMA Networks
Sep 2010
The problem of maximizing a utility function while limiting the outage probability below an appropriate threshold is investigated. A coded-division multi access wireless network under mixed...
Provided by KTH Royal Institute of Technology
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Whitepapers
Non-Cooperative Dynamic Spectrum Access for CDMA Networks
Aug 2007
Recent studies indicate the presence of a significant amount of idle licensed spectrum, in different time periods and geographic locations. Prompted by the latest regulatory changes and radio...
Provided by University of Athens
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Whitepapers
Performance of MC-DS-CDMA System in Rayleigh Fading Channel With Non-Coherent Combining Schemes and MAI Interference
Mar 2010
In this paper, the authors analyzed the multi - carrier direct sequence code division multiple access system when the received signal is divided into predetermined spreading sequences, and the sub...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
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Whitepapers
Spatial Diversity Scheme to Efficiently Cancel ISI and ICI in OFDM-OQAM Systems
Oct 2010
This paper is based on an Offset Quadrature Amplitude Modulation (OQAM) Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme that is operated without a Cyclic Prefix (CP), where...
Provided by Hindawi Publishing
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Whitepapers
Cooperative Subcarrier and Power Allocation for a Two-Hop Decode-and-Forward OFCDM Based Relay Network
Jan 2010
For wideband applications, Code Division Multiple Access (CDMA) based systems deployed on multi-carriers could provide effective multiple access capabilities. First was the Multi-Carrier...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Random DS/CDMA for the Amplify and Forward Relay Channel
Oct 2008
This paper presents a communication system where point-to-point transmissions are aided by L half-duplex, amplify and forward relays which access a common channel by means of random spreading...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Fair Cooperation Protocol for Wireless Mesh Networks Based on Time-Space Volumes
Apr 2008
In this paper, a new method for resource allocation in TDMA managed wireless mesh networks without energy constraint is studied. In particular two distributed protocols are proposed with the aim...
Provided by CTTC
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Whitepapers
The DS/CDMA Amplify and Forward Relay Channel: Asymptotic Spectral Efficiency
Jun 2008
This paper presents some research results obtained within COOPCOM, a EU-funded research project that investigates theoretical and practical issues of cooperative and opportunistic communications....
Provided by CTTC
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Whitepapers
About Asymptotic Spectral Efficiency in the DS/CDMA Amplify and Forward Relay Channel
May 2008
Diversity is one of the most common solutions to fading channels in wireless communications: the same information is sent over multiple, independently faded channels, improving the probability of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Lowsource Power Regime of the DS/CDMA Relay Channel
Jul 2008
This paper considers a DS/CDMA relay system where random spreading sequences are employed at the relays to allow multiple access to the channel between relays and destination. Two different...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of CDMA-Based Multi-Hop Wireless Networks in Fading
Jun 2010
In this paper, the authors derive the end-to-end error probability of multi-hop networks employing CDMA transmission in a multiuser environment. The standard Gaussian Approximation (SGA) is used...
Provided by Institute of Electrical & Electronic Engineers
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White Papers
Modelling and Analysis of the Distributed Coordination Function of IEEE 802.11 With Multirate Capability
Jun 2008
In this paper a discussion of the detailed operation of the interleavers used by the turbo codes defined on the telecommunications standards cdma2000 (3GPP2 C.S0024-B V2.0) and W-CDMA (3GPP TS...
Provided by Javeriana University
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White Papers
Frequency Domain Hybrid-ARQ Chase Combining for Broadband MIMO CDMA Systems
Apr 2009
In this paper, the authors consider high-speed wireless packet access using Code Division Multiple Access (CDMA) and Multiple-Input - Multiple-Output (MIMO). Current wireless standards, such as...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A QoS Based MAC Protocol for Wireless Ad-Hoc Network
Mar 2011
Multimedia communication over wireless Ad-hoc networks has become the driving technology for many of the important applications, experiencing dramatic market growth and promising revolutionary...
Provided by Cornell University
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White Papers
Performance of Adaptive Beamforming Algorithm for LMS-MCCDMA MIMO Smart Antennas
Jul 2009
The authors propose a downlink multiple-input multiple-output multi-carrier code division multiple access system with adaptive beamforming algorithm for smart antennas. The algorithm used in this...
Provided by Association of Colleges of Computing and Information
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White Papers
Performance of OCDMA Systems Using Random Diagonal Code for Different Decoders Architecture Schemes
Jan 2010
In this paper, new code families are constructed for spectral-amplitude coding optical code division multiple access, called random diagonal code for spectral amplitude coding optical code...
Provided by UniMAP
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White Papers
Optimal Sparse CDMA Detection at High Load
May 2009
Balancing efficiency of bandwidth use and complexity of detection involves choosing a suitable load for a multi-access channel. In the case of synchronous CDMA, with random codes, it is possible...
Provided by Hong Kong University of Science and Technology
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White Papers
Reed-Muller Codes for Peak Power Control in Multicarrier CDMA
Oct 2010
Reed-Muller codes are studied for peak power control in Multi Carrier Code-Division Multiple Access (MC-CDMA) communication systems. In a coded MC-CDMA system, the information data multiplexed...
Provided by Lakehead University
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White Papers
MIMO Based Multimedia Communication System
Mar 2009
Communication technology requires being sustainable in the sense of people's satisfaction for high data rate multimedia communication. Communication channel is the main constraint to achieve high...
Provided by Jadavpur University
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White Papers
Wi-Fi, WiMax and WCDMA a Comparative Study Based on Channel Impairments and Equalization Method Used
Mar 2009
The use of Vehicle-To-Vehicle (V2V) communication will be an integral part of Intelligent Transport Systems (ITSs), and work on ITS has been growing substantially in recent years. Some obvious...
Provided by Jadavpur University
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White Papers
Uplink Capacity and Interference Avoidance for Two-Tier Femtocell Networks
Feb 2009
Two-tier femtocell networks - comprising a conventional cellular network plus embedded femtocell hotspots - offer an economically viable solution to achieving high cellular user capacity and...
Provided by University of Texas
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White Papers
Local Multicoloring Algorithms: Computing a Nearly-Optimal TDMA Schedule in Constant Time
Feb 2009
In this paper, the authors look at a variant of the standard vertex coloring problem that they name graph multicoloring. Given an n-node graph G = (V, E), the goal is to assign a set Sv of colors...
Provided by Massachusetts Institute of Technology
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White Papers
Analysis of Uncoordinated Opportunistic Two-Hop Wireless Ad Hoc Systems
Jan 2009
The authors consider a time-slotted two-hop wireless system in which the sources transmit to the relays in the even time slots (first hop) and the relays forward the packets to the destinations in...
Provided by University of Notre Dame
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White Papers
An Information Theoretic Analysis of Single Transceiver Passive RFID Networks
Jan 2009
In this paper, the authors study single transceiver passive RFID networks by modeling the underlying physical system as a special cascade of a certain BroadCast Channel (BCC) and a multiple access...
Provided by Cornell University
-
White Papers
Input Parameters Optimization in Swarm DS-CDMA Multiuser Detectors
Dec 2010
In this paper, the uplink Direct Sequence Code Division Multiple Access (DS-CDMA) MultiUser Detection problem (MUD) is studied into heuristic perspective, named Particle Swarm Optimization (PSO)....
Provided by University of Sao Paulo
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White Papers
Asymptotic Spectral Distribution of Crosscorrelation Matrix in Asynchronous CDMA
Oct 2008
Asymptotic Spectral Distribution (ASD) of the crosscorrelation matrix is investigated for a random spreading short/long-code asynchronous Direct Sequence-Code Division Multiple Access (DS-CDMA)...
Provided by National Tsing Hua University
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White Papers
Power Efficient Scheduling Under Delay Constraints Over Multi-User Wireless Channels
Feb 2008
In this paper, the authors consider the problem of power efficient uplink scheduling in a Time Division Multiple Access (TDMA) system over a fading wireless channel. The objective is to minimize...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Almost-Optimum Signature Matrices in Binary-Input Synchronous Overloaded CDMA
Dec 2010
The everlasting bandwidth limitations in wireless communication networks has directed the researchers' thrust toward analyzing the prospect of overloaded Code Division Multiple Access (CDMA). In...
Provided by Sharif University of Technology
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White Papers
A Steganography Based on CT-CDMA Communication Scheme Using Complete Complementary Codes
Jan 2010
It has been shown that complete complementary codes can be applied into some communication systems like approximately synchronized CDMA systems because of its good correlation properties. CT-CDMA...
Provided by Tokyo National College of Technology
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White Papers
Link Scheduling in STDMA Wireless Networks: A Line Graph Approach
Dec 2007
A prevalent scheme for spatial reuse in wireless networks is Spatial Time Division Multiple Access (STDMA), in which time is divided into fixed-length slots that are organized cyclically. An STDMA...
Provided by Indian Institute of Technology Bombay
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White Papers
Joint Receiver and Transmitter Optimization for Energy-Efficient CDMA Communications
Dec 2007
This paper focuses on the cross-layer issue of joint multiuser detection and resource allocation for energy efficiency in wireless CDMA networks. In particular, assuming that a linear multiuser...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Generating Functional Analysis for Iterative CDMA Multiuser Detectors
Mar 2011
The authors investigate the detection dynamics of a soft Parallel Interference Canceller (soft-PIC), which includes a hard-PIC as a special case, for CDMA multiuser detection, applied to a...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
The Size of Optimal Sequence Sets for Synchronous CDMA Systems
Feb 2008
The sum capacity on a symbol-synchronous CDMA system having processing gain N and supporting K power constrained users is achieved by employing at most 2N − 1 sequences. Analogously, the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Improvement of BP-Based CDMA Multiuser Detection by Spatial Coupling
Feb 2011
Kudekar et al. proved that the Belief-Propagation (BP) threshold for low-density parity-check codes can be boosted up to the Maximum-A-Posteriori (MAP) threshold by spatial coupling. In this...
Provided by Kyoto University
-
White Papers
Sparsely-Spread CDMA - A Statistical Mechanics Based Analysis
Apr 2008
Sparse Code Division Multiple Access (CDMA), a variation on the standard CDMA method in which the spreading (signature) matrix contains only a relatively small number of non-zero elements, is...
Provided by Aston University
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White Papers
A New Decoding Scheme for Errorless Codes for Overloaded CDMA With Active User Detection
Oct 2009
In a binary CDMA system, each user is assigned a binary signature vector. At each symbol interval, each user multiplies its symbol (which is +1 or -1) by its signature and sends it through the...
Provided by Sharif University of Technology
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White Papers
An Efficient CDMA Decoder for Correlated Information Sources
Jan 2010
The authors consider the detection of correlated information sources in the ubiquitous Code-Division Multiple-Access (CDMA) scheme. They propose a message-passing based scheme for detecting...
Provided by University of California
-
White Papers
Adaptive MMSE Rake Receiver for WCDMA
Aug 2010
Several types of Rake Receivers like A-Rake, S-Rake, P-Rake, Adaptive frequency Rake, Time frequency Rake, Conventional MMSE Rake and Adaptive MMSE Rake are used for WCDMA. In this paper, the...
Provided by University of Asmara
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White Papers
A Rake Receiver Model for Filtering White Nose Presence in the Receiving Signals
Feb 2010
The third-generation universal mobile telecommunications system uses the high signal bandwidth for the WCDMA system (5 MHz) allows the received signal to be split into distinct multipath with high...
Provided by University of Asmara
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White Papers
Improving Capacity and Coverage for Multirate Soft Handoffs in WCDMA Cellular Systems
Nov 2009
The paper proposes Joint Power and Rate assignment Algorithm (JPRA) to deal with multirate soft handoffs in mixed size Wideband Code Division Multiple Access (WCDMA) cellular systems. The JPRA...
Provided by Pondicherry Engineering College
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White Papers
WirelessHART: Applying Wireless Technology in Real-Time Industrial Process Control
Jun 2008
Wireless technology has been regarded as a paradigm shifter in the process industry. The first open wireless communication standard specifically designed for process measurement and control...
Provided by University of Texas
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White Papers
MIST: Cellular Data Network Measurement for Mobile Applications
Oct 2009
The rapid growth in the popularity of cellular networks has led to aggressive deployment and a rapid expansion of mobile services. Services based on the integration of cellular networks into the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Interference Avoidance and Control
Sep 2008
The throughput of a wireless network is often limited by interference caused by multiple concurrently active nodes. The conventional approach of using a "One-transmission-at-a-time" MAC protocol...
Provided by Massachusetts Institute of Technology
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White Papers
Designing NFS With RDMA for Security, Performance and Scalability
Jan 2011
NFS has traditionally used TCP or UDP as the underlying transport. However, the overhead of these stacks has limited both the performance and scalability of NFS. Recently, high-performance network...
Provided by Ohio State University
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Case Studies
Veroxity VPLS-Based Network Delivers High Availability
Nov 2009
Veroxity delivers simplified data and Internet connectivity solutions through a streamlined process they need to expand L2VPN service footprint while minimizing operational costs with continue to...
Provided by Cisco Systems
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White Papers
SAMAC: A Cross-Layer Communication Protocol for Sensor Networks With Sectored Antennas
Aug 2010
Wireless sensor networks have been used to gather data and information in many diverse application settings. The capacity of such networks remains a fundamental obstacle toward the adaptation of...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
CILoS: A CDMA Indoor Localization System
Sep 2008
CILoS is an indoor localization system based on CDMA mobile phone signal fingerprinting. CDMA networks vary their transmission power to accommodate fluctuations in network load. This affects...
Provided by Association for Computing Machinery
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White Papers
A New Method for Multi-Objective TDMA Scheduling in Wireless Sensor Networks Using Pareto-Based PSO and Fuzzy Comprehensive Judgement
Sep 2007
In wireless sensor networks with many-to-one transmission mode, a multi-objective TDMA (Time Division Multiple Access) scheduling model is presented, which concerns about the packet delay and the...
Provided by Springer Science+Business Media
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White Papers
A Measurement Study of Interference Modeling and Scheduling in Low-Power Wireless Networks
Nov 2008
Accurate interference models are important for use in transmission scheduling algorithms in wireless networks. In this work, the authors perform extensive modeling and experimentation on two...
Provided by Association for Computing Machinery
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White Papers
Bent Functions at the Minimal Distance and Algorithms of Constructing Linear Codes for CDMA
Apr 2010
In this paper the authors study linear codes for CDMA (Code Division Multiple Access). This is the standard for the 3rd Generation cellular communications systems. In this standard bent functions...
Provided by Novosibirsk State University
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White Papers
ACR: Active Collision Recovery in Dense Wireless Sensor Networks
Dec 2009
Packet collision causes packet loss and wastes resources in wireless networks. It becomes even worse in dense WSNs, due to burst-traffic and congestion around sinks. In this paper, the authors...
Provided by University of Virginia
-
White Papers
A Solution for Seamless Video Delivery in WLAN/3G Networks
Jul 2011
In this paper, the authors introduce a Session Proxy (SP) into a scenario in which Wireless Local Area Network (WLAN) and 3th Generation of networks cellular (3G networks) are integrated using...
Provided by IARIA
-
White Papers
Performance Analysis of Receive Collaboration in TDMA-Based Wireless Sensor Networks
Jul 2011
This paper presents a general framework to enable the implementation of receive collaboration in Wireless Sensor Networks (WSN). The framework also allows the evaluation of Collaborative Channel...
Provided by IARIA
-
White Papers
An Integrated Cluster-Based Multi-Channel MAC Protocol for Mobile Ad Hoc Networks
Nov 2007
This paper proposes a novel joint clustering and multi-channel Medium Access Control (MAC) protocol for mobile ad hoc networks, based on a scalable two-phase coding scheme. It employs the...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
A Divergence Minimization Approach to Joint Multiuser Decoding for Coded CDMA
Apr 2008
In this paper, a theoretical framework of Divergence Minimization (DM) is applied to derive iterative receiver algorithms for coded CDMA systems. The DM receiver obtained performs joint channel...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Seamless Handover Between CDMA2000 and 802.11 WLAN Using MSCTP
Apr 2012
The invention of mobile devices such as laptops, hand-held computers, and cellular phones has changed the whole Internet world. The main feature of mobile devices is that they can access the...
Provided by Universal Association of Computer and Electronics Engineers
-
Whitepapers
Case Study: How Cumulus Media Took Control of Telecom and Slashed Costs
May 2012
For Cumulus Media, a string of 100 acquisitions resulted in a chaotic array of carriers, calling plans and features. Rather than a manageable group of core service providers and carriers, the...
Provided by Cass Information Systems
-
White Papers
A New Hybrid Approach for Heterogeneous Radio Access Technology Selection
Jan 2012
Over the past twenty years, a number of wireless technologies were developed. The first generation systems are based on analog radio transmission. The Second Generation systems 2G brought a number...
Provided by Science Publications
-
White Papers
MPR-Aware Performance Improvement for Inter-Domain Routing in MANETs
Aug 2011
Inter-domain routing for MANETs (Mobile Ad Hoc NETworks) draws increasing attention in military and civil application. It works on heterogeneous networking protocols, including different MAC layer...
Provided by University of California
-
White Papers
Medium Access for a Military Narrowband Wireless Ad-Hoc Network; Requirements and Initial Approaches
Sep 2008
This paper presents the initial requirements for a tactical military MANET and their implications on the design of a Medium Access Control (MAC) protocol. The main focus is on TDMA based mobile...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Performance Analysis of Multi-User Multi Input Multi Output-Interleave-Division Multiple-Access System Employing Turbo Coding With Multi-User Detection Over Frequency-Selective Wireless Communication Channel
Feb 2011
Code division multiple access system is the most widely used system for multi-user communications. But the performances of CDMA is limited by multiple access interference and inter symbol...
Provided by Science Publications
-
White Papers
Performance of MMSE Receiver Based Multi Input Multi Output-Interleave Division Multiple-Access System with Multi-user Detection Over Frequency Selective Wireless Communication Channel
Jun 2011
Code division multiple access system is the most widely used system for multi-user communications. But the performance of CDMA is limited by multiple access interference and inter symbol...
Provided by Science Publications
-
White Papers
CDMA Vs. OFDM- Comparison and Hybrid OFDM- The Solution for the Next Generation
May 2012
This paper investigates the effectiveness of OFDM and proven in other conventional (narrowband) commercial radio technologies (e.g. DS-CDMA in cell phones) (e.g. OFDM in IEEE 802.11a/g). The main...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Throughput Analysis of Multi-Channel TD-CSMA System and Reinforcement Learning
May 2012
This paper generates a cognitive radio scenario based on non-persistent Carrier Sense Multiple Access (CSMA) and Time Division Multiple Access (TDMA) systems sharing a multi-channel wireless...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Weighted Code Transmission in Optical CMDA
Mar 2012
In this paper, the comparative analysis of a fibre optics CDMA system with or without weighted code is presented using Matlab simulation. By changing various parameters of the systems, the authors...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Construction and Performance Studies of a Pseudo-Orthogonal Code for Fiber Optic CDMA LAN
Jan 2012
A pseudo-orthogonal prime sequence code and a modified prime sequence code using the elements of Galoi's Field (GF) for a particular prime number have been developed. Bit-error rate performances...
Provided by International Journal of Soft Computing and Engineering (IJSCE)
-
White Papers
Multimedia Networks Based Dynamic WCDMA System Proposal for Qos
Oct 2011
In WCDMA 3rd Generation (3G) systems although there is no need for frequency planning as the case with Second Generation (2G) systems, the limitation of both capacity and coverage by the...
Provided by Bansal Institute of Science and Technology
-
White Papers
WR Based Semi-Blind Channel Estimation for Frequency-Selective MIMO MC-CDMA Systems
Jan 2012
In this paper, the authors propose a novel Whitening-Rotation (WR) based Semi-Blind (SB) scheme for frequency-selective channel estimation in Multiple-Input Multiple-Output (MIMO) Multi-Carrier...
Provided by Indian Institute of Technology Kanpur
-
White Papers
Deterministic Formulization of SNR for Wireless Multiuser DS-CDMA Networks
Aug 2009
Wireless multiuser receivers suffer from their relatively higher computational complexity that prevents widespread use of this technique. In addition, one of the main characteristics of...
Provided by University of Bridgeport
-
White Papers
Multiuser Detection in Large-Dimension Multicode MIMO-CDMA Systems With Higher-Order Modulation
Jan 2012
In this paper, the authors are interested in high spectral efficiency multi-code CDMA systems with large number of users employing single/multiple transmit antennas and higher-order modulation. In...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Performance Comparison of Spatial Reused Bandwidth Reservation in Satellite Networks
Apr 2012
In this paper, the authors present a spatial reused bandwidth reservation scheme in Time Division Multiple Accesses (TDMA)-based uplink channel of satellite networks by using directional antennas....
Provided by AICIT
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White Papers
A New Quantum Clone Genetic Algorithm Based Multi-User Detection for CDMA System
Dec 2011
Quantum intelligent computation has been widely drawing the attention of many researchers. Quantum clone genetic algorithm, which is based on quantum genetic algorithm and clone algorithm, is a...
Provided by AICIT
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White Papers
Relay-Assisted Partial Packet Recovery With IDMA Method in CDMA Wireless Network
Apr 2010
Automatic Repeat Request (ARQ) is an effective technique for reliable transmission of packets in wireless networks. In ARQ, however, only a few erroneous bits in a packet will cause the entire...
Provided by China University of Technology
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White Papers
Group-Based Block Linear Successive Interference Cancellation for DS-CDMA
Jun 2009
Mobile communication systems based on DS-CDMA suffer from Multiple Access Interference (MAI), which limits the system capacity. Several techniques, such as beamforming with multiple antennas and...
Provided by Institute of Electrical & Electronic Engineers
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White Papers
Group-Based Linear Parallel Interference Cancellation for DS-CDMA Systems
Jun 2009
The increase in the demand for voice and data wireless services creates a need for a more efficient use of the available bandwidth. Current and future generations cellular systems based on DS-CDMA...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Use of Turbo Codes With Low-Rate Convolutional Constituent Codes in Fingerprinting Scenarios
Sep 2011
The authors discuss the use of turbo codes in fingerprinting schemes. More precisely, they present a family of turbo codes that are secure against attacking coalitions of size 2. This family is...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
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Whitepapers
MCMAC: An Optimized Medium Access Control Protocol for Mobile Clusters in Wireless Sensor Networks
Jul 2010
Wireless Sensor Networks (WSNs) are developing into a promising solution for many applications, for example in healthcare. In many scenarios, there is some form of node mobility. The Medium Access...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Outage-Based Rate Maximization in CDMA Wireless Networks
Oct 2008
The problem of maximizing the sum of the transmit rates while limiting the outage probability below an appropriate threshold is investigated for networks where the nodes have limited processing...
Provided by University of California
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Whitepapers
A Generalized Utility Maximization Problem With Outage Constraints in CDMA Networks
Sep 2010
The problem of maximizing a utility function while limiting the outage probability below an appropriate threshold is investigated. A coded-division multi access wireless network under mixed...
Provided by KTH Royal Institute of Technology
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Whitepapers
Non-Cooperative Dynamic Spectrum Access for CDMA Networks
Aug 2007
Recent studies indicate the presence of a significant amount of idle licensed spectrum, in different time periods and geographic locations. Prompted by the latest regulatory changes and radio...
Provided by University of Athens
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Whitepapers
Performance of MC-DS-CDMA System in Rayleigh Fading Channel With Non-Coherent Combining Schemes and MAI Interference
Mar 2010
In this paper, the authors analyzed the multi - carrier direct sequence code division multiple access system when the received signal is divided into predetermined spreading sequences, and the sub...
Provided by Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
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Whitepapers
Spatial Diversity Scheme to Efficiently Cancel ISI and ICI in OFDM-OQAM Systems
Oct 2010
This paper is based on an Offset Quadrature Amplitude Modulation (OQAM) Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme that is operated without a Cyclic Prefix (CP), where...
Provided by Hindawi Publishing
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Whitepapers
Cooperative Subcarrier and Power Allocation for a Two-Hop Decode-and-Forward OFCDM Based Relay Network
Jan 2010
For wideband applications, Code Division Multiple Access (CDMA) based systems deployed on multi-carriers could provide effective multiple access capabilities. First was the Multi-Carrier...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Random DS/CDMA for the Amplify and Forward Relay Channel
Oct 2008
This paper presents a communication system where point-to-point transmissions are aided by L half-duplex, amplify and forward relays which access a common channel by means of random spreading...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Fair Cooperation Protocol for Wireless Mesh Networks Based on Time-Space Volumes
Apr 2008
In this paper, a new method for resource allocation in TDMA managed wireless mesh networks without energy constraint is studied. In particular two distributed protocols are proposed with the aim...
Provided by CTTC
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Whitepapers
The DS/CDMA Amplify and Forward Relay Channel: Asymptotic Spectral Efficiency
Jun 2008
This paper presents some research results obtained within COOPCOM, a EU-funded research project that investigates theoretical and practical issues of cooperative and opportunistic communications....
Provided by CTTC
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Whitepapers
About Asymptotic Spectral Efficiency in the DS/CDMA Amplify and Forward Relay Channel
May 2008
Diversity is one of the most common solutions to fading channels in wireless communications: the same information is sent over multiple, independently faded channels, improving the probability of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Lowsource Power Regime of the DS/CDMA Relay Channel
Jul 2008
This paper considers a DS/CDMA relay system where random spreading sequences are employed at the relays to allow multiple access to the channel between relays and destination. Two different...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of CDMA-Based Multi-Hop Wireless Networks in Fading
Jun 2010
In this paper, the authors derive the end-to-end error probability of multi-hop networks employing CDMA transmission in a multiuser environment. The standard Gaussian Approximation (SGA) is used...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Adaptive Technique for CI/MC-CDMA System Using Combined Strategy of Genetic Algorithms and Neural Network
May 2010
MultiCarrier Code Division Multiple Access (MC-CDMA) is one of the most promising techniques for high bit rate and high user capacity transmission in future broadband mobile services. The use of...
Provided by Macrothink Institute
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Whitepapers
Performance Evolutionary in AWGN Channel for 802.11a High Speed Network
Feb 2012
FDMA, TDMA and CDMA are the well known multiplexing techniques used in wireless communication systems. While working with the wireless systems using these techniques various problems encountered...
Provided by International Journal of Advanced Research in Computer Science and Software Engineering (IJARCSSE)
