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Issue 4 • April-2011
Showing 1-25 of 39
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Symbol Error Outage Analysis of MIMO OSTBC Systems over Rice Fading Channels in Shadowing Environments
Philippe Mary;Mischa Dohler;Jean-Marie Gorce;Guillaume Villemaud
Publication Year: 2011,Page(s):1009 - 1014
Cited by: Papers (6)
We deal with the analytical performance study of orthogonal space-time block codes (OSTBC) applied to multiple-input multiple-output (MIMO) systems experiencing non-frequency selective fast fading and shadowing. We address the problem of finding a tractable closed-form expression for the symbol error outage (SEO) over Rice fading channels in shadowing environments. In order to obtain the SEO, a sy...Show More
The 802.11g 11 Mb/s Rate is More Robust than 6 Mb/s
Publication Year: 2011,Page(s):1015 - 1020
Cited by: Papers (11)
The robustness to noise of the 802.11b/g 5.5 Mb/s and 11 Mb/s rates must be investigated experimentally as they cannot be predicted theoretically. In this paper we report on detailed outdoor and indoor measurements that lead us to the surprising conclusion that the 11 Mb/s 802.11g rate experiences fewer packet losses than the 6 Mb/s 802.11g rate at any given (symbol) SNR. This occurs due to the co...Show More
Accurate Outage Analysis of Incremental Decode-and-Forward Opportunistic Relaying
Publication Year: 2011,Page(s):1021 - 1025
Cited by: Papers (71)
In this paper, we investigate a dual-hop decode-and-forward opportunistic relaying scheme where the selected relay chooses to cooperate only if the source-destination channel is of an unacceptable quality. We first derive the exact statistics of received signal-to-noise (SNR) over each hop with co-located relays, in terms of probability density function (PDF). Then, the PDFs are used to determine ...Show More
Cross-Layer Designed Adaptive Modulation Algorithm with Packet Combining and Truncated ARQ over MIMO Nakagami Fading Channels
Publication Year: 2011,Page(s):1026 - 1031
Cited by: Papers (20)
This paper presents an optimal adaptive modulation (AM) algorithm designed using a cross-layer approach which combines truncated automatic repeat request (ARQ) protocol and packet combining. Transmissions are performed over multiple-input multiple-output (MIMO) Nakagami fading channels, and retransmitted packets are not necessarily modulated using the same modulation format as in the initial trans...Show More
On the Asymptotic Capacity of Multi-Hop MIMO Ad Hoc Networks
Publication Year: 2011,Page(s):1032 - 1037
Cited by: Papers (21)
Multi-input multi-output (MIMO) is a key technology to increase the capacity of wireless networks. Although there has been extensive work on MIMO at the physical and link layers, there is limited work on MIMO at the network layer (i.e., multi-hop MIMO network), particularly results on capacity scaling laws. In this paper, we investigate capacity scaling laws for MIMO ad hoc networks. Our goal is t...Show More
Optimal Beamforming with Combining for the Non-Orthogonal Amplify-and-Forward (NAF) Protocol in Cooperative Communication Systems
Publication Year: 2011,Page(s):1038 - 1043
Cited by: Papers (4)
This paper expands optimal beamforming with combining from the amplify-and-forward (AF) protocol to the non-orthogonal AF (NAF) protocol for environments with perfect channel state information (CSI) and a sum power constraint. After formulating an optimization problem for maximizing the signal-to-noise ratio (SNR), we propose optimal beamforming and combining vectors. After exhaustive comparison o...Show More
BER Performance Analysis of Cooperative DaF Relay Networks and a New Optimal DaF Strategy
George A. Ropokis;Athanasios A. Rontogiannis;Kostas Berberidis
Publication Year: 2011,Page(s):1044 - 1049
Cited by: Papers (7)
An analytical bit error rate (BER) performance study of three detect-and-forward (DaF) policies under a common framework is presented in this paper. More specifically, the direct, thresholded and link-adaptive schemes are studied, which differ in the way the decision on the transmitted symbol is forwarded from the relay to the destination. The analysis is carried out for a single relay DaF transmi...Show More
Asymptotic Analysis of Opportunistic Relaying Based on the Max-Generalized-Mean Selection Criterion
Publication Year: 2011,Page(s):1050 - 1057
Cited by: Papers (11)
In an opportunistic relaying mechanism, the "best" relay is selected to forward a received signal to the destination. In this paper, we propose a novel criterion to choose the "best" relay, namely the max-generalized-mean (MGM) selection criterion, which encompasses the max-min and the max-harmonic-mean (MHM) selection criteria. We then analyze the asymptotic outage probability of the selection de...Show More
QoS, Channel and Energy-Aware Packet Scheduling over Multiple Channels
Publication Year: 2011,Page(s):1058 - 1062
Cited by: Papers (6)
In this letter, we extend the study from our previous work in. First, we extend physical layer resource allocation problem to a packet based transmission scheme. The proposed packet assignment improves the implementation robustness as it allows for consideration of coded modulation schemes while still ensuring energy efficient transmission as with our previous work. Secondly, we study the impact o...Show More
Effect of Primary User Traffic on Sensing-Throughput Tradeoff for Cognitive Radios
Publication Year: 2011,Page(s):1063 - 1068
Cited by: Papers (111)
The effect of the primary user traffic on the performance of the secondary network is investigated for the tradeoff between the sensing quality and the achievable throughput. Numerical results show that the actual secondary network performance when the random departure or arrival of the primary user is taken into account is worse than the predicted secondary network performance in the literature a...Show More
Performance Analysis of a Cooperative System with Rateless Codes and Buffered Relays
Publication Year: 2011,Page(s):1069 - 1081
Cited by: Papers (53)
In a cooperative relay-assisted communication system that uses rateless codes, packets get transmitted from a source to a destination at a rate that depends on instantaneous channel states of the wireless links between nodes. When multiple relays are present, the relay with the highest channel gain to the source is the first to successfully decode a packet from the source and forward it to the des...Show More
Multi-Relay Selection Design and Analysis for Multi-Stream Cooperative Communications
Publication Year: 2011,Page(s):1082 - 1089
Cited by: Papers (26)
In this paper, we consider the problem of multi-relay selection for multi-stream cooperative MIMO systems with M relay nodes. Traditionally, relay selection approaches are primarily focused on selecting one relay node to improve the transmission reliability given a single-antenna destination node. As such, in the cooperative phase whereby both the source and the selected relay nodes transmit to th...Show More
Cognitive Code-Division Channelization
Kanke Gao;Stella N. Batalama;Dimitris A. Pados;John D. Matyjas
Publication Year: 2011,Page(s):1090 - 1097
Cited by: Papers (20)
We consider the problem of simultaneous power and code-channel allocation for a secondary transmitter/receiver pair coexisting with a primary code-division multiple-access (CDMA) system. Our objective is to find the optimum transmitting power and code sequence of the secondary channel that maximize the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum SINR linear receiver...Show More
Cognitive Code-Division Channelization
Kanke Gao;Stella N. Batalama;Dimitris A. Pados;John D. Matyjas
Year: 2011 | Volume: 10 | Issue: 4
Channel Modeling Approach Based on the Concept of Degradation Level Discrete-Time Markov Chain: UWB System Case Study
Publication Year: 2011,Page(s):1098 - 1107
Cited by: Papers (12)
In this work an approach to obtain an accurate high level channel model based on Discrete-Time Markov Chain, useful in some simulation context, is provided. In particular, this model is based on the concept of error trace analysis and on the degradation level of given observation windows: an observation window is fixed and the degradation level of the link, the Packet Error Rate (PER) relative to ...Show More
Utility Maximization via Power and Rate Allocation with Outage Constraints in Nakagami-Lognormal Channels
Publication Year: 2011,Page(s):1108 - 1120
Cited by: Papers (13)
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 Nakagami-lognormal fading is considered. Solving such a utility maximization problem is difficult because the problem is non-convex and non-geometric with mixed integer and real decision variables and no explic...Show More
Optimal Network Size and Encoding Rate for Wireless Sensor Network-Based Decentralized Estimation under Power and Bandwidth Constraints
Publication Year: 2011,Page(s):1121 - 1131
Cited by: Papers (7)
In this paper, we address the problem of decentralized parameter estimation via Wireless Sensor Networks (WSNs). We consider two different encoding strategies, namely, Quantize-and-Estimate (Q&E) and Compress-and-Estimate (C&E) and assume that sensor observations are conveyed to the Fusion Center (FC) over a number of orthogonal Gaussian or Rayleigh-fading channels. We constrain both power and ban...Show More
Performance and Optimization of Amplify-and-Forward Cooperative Diversity Systems in Generic Noise and Interference
Publication Year: 2011,Page(s):1132 - 1143
Cited by: Papers (35)
Cooperative diversity systems have received significant attention recently as a distributed means of exploiting the inherent spatial diversity of wireless networks. In this paper, we consider a cooperative diversity system consisting of a source, a destination, and multiple single-hop amplify-and-forward relays, and provide a mathematical framework for the asymptotic analysis of this system in gen...Show More
Generalized Space-Time Shift Keying Designed for Flexible Diversity-, Multiplexing- and Complexity-Tradeoffs
Publication Year: 2011,Page(s):1144 - 1153
Cited by: Papers (141)
In this paper, motivated by the recent concept of Spatial Modulation (SM), we propose a novel Generalized Space-Time Shift Keying (G-STSK) architecture, which acts as a unified Multiple-Input Multiple-Output (MIMO) framework. More specifically, our G-STSK scheme is based on the rationale that P out of Q dispersion matrices are selected and linearly combined in conjunction with the classic PSK/QAM ...Show More
Efficient Algorithm for Constructing Minimum Size Wireless Sensor Networks to Fully Cover Critical Square Grids
Publication Year: 2011,Page(s):1154 - 1164
Cited by: Papers (26)
Wireless sensor networks are formed by connected sensors that each have the ability to collect, process, and store environmental information as well as communicate with others via inter-sensor wireless communication. These characteristics allow wireless sensor networks to be used in a wide range of applications. In many applications, such as environmental monitoring, battlefield surveillance, nucl...Show More
Transient Analysis of IEEE 802.15.4 Sensor Networks
Marco Gribaudo;Daniele Manini;Alessandro Nordio;Carla-Fabiana Chiasserini
Publication Year: 2011,Page(s):1165 - 1175
Cited by: Papers (16)
We study the delay performance of a sensor network, whose nodes access the medium by using the unslotted MAC protocol specified by the IEEE 802.15.4 standard. Unlike previous works, which focus on the average throughput and delay analysis, we develop a detailed model that allows us to obtain the delivery delay distribution of messages sent by concurrently contending sensors toward a central contro...Show More
On Ergodic Secrecy Rate for Gaussian MISO Wiretap Channels
Publication Year: 2011,Page(s):1176 - 1187
Cited by: Papers (125)
A Gaussian multiple-input single-output (MISO) wiretap channel model is considered, where there exists a transmitter equipped with multiple antennas, a legitimate receiver and an eavesdropper, each equipped with a single antenna. We study the problem of finding the optimal input covariance that maximizes the ergodic secrecy rate subject to a power constraint, where only statistical information abo...Show More
A Selective-Relay Based Cooperative Spectrum Sensing Scheme without Dedicated Reporting Channels in Cognitive Radio Networks
Publication Year: 2011,Page(s):1188 - 1198
Cited by: Papers (83)
Typically, each cooperative spectrum sensing process requires two phases: the primary user's signal detection phase, in which all cognitive users attempt to detect the presence of the primary user within a certain observation window (called signal detection overhead); and the initial detection result reporting phase, in which the cognitive users forward their detection results to a fusion center. ...Show More
BER and Diversity Order Analysis of Distributed Alamouti's Code with CSI-Assisted Relays
Publication Year: 2011,Page(s):1199 - 1211
Cited by: Papers (8)
This paper focuses on the average bit error rate (BER) and diversity order analysis of the distributed Alamouti's code in dissimilar cooperative networks with channel state information (CSI)-assisted relays. We first assume that the relays adopt the amplifying coefficient proposed in . Lower and upper bounds of the average BER of the distributed Alamouti's code are derived. Those two bounds tightl...Show More
Contact Information
Editor-in-Chief
Vincent Wong
Professor, Electrical and Computer Engineering
The University of British Columbia
Vancouver
Canada
vincentw@ece.ubc.caContact Information
Editor-in-Chief
Vincent Wong
Professor, Electrical and Computer Engineering
The University of British Columbia
Vancouver
Canada
vincentw@ece.ubc.caIEEE Account
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