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Performance evaluation and protocol design of fixed-rate and rateless coded relaying networks Open Access


Other title
large SNR approximation
outage probability
energy per bit
cooperative communication
single-hop communication
fixed-rate codes
peak power constraint
average capacity
rateless coding
power allocation schemes
acknowledgment signals
selection relaying
repetition coding
relaying networks
feedback communication
maximum likelihood
cooperative gain
rateless codes
multiple access channels
dual-hop relaying
orthogonal relaying
relay-to-source usage ratio
mutual information
energy per symbol
nonconcave fractional programming
bit error rate
energy efficiency
maximum achievable rates
average power constraint
rateless coded relaying
parallel channel coding
degree of freedom
superimposed relaying
decode-and-forward relaying
numerical optimization
amplify-and-forward relaying
symbol error rate
direct transmission
maximal ratio combining
power fairness
protocol design
distributed space-time coding
Rayleigh fading
rate efficiency
optimal power allocation
outage optimality
fixed-rate coding
fixed-rate coded relaying
Type of item
Degree grantor
University of Alberta
Author or creator
Nikjah, Reza
Supervisor and department
Beaulieu, Norman C. (Electrical and Computer Engineering)
Examining committee member and department
Jing, Yindi (Electrical and Computer Engineering)
Tellambura, Chintha (Electrical and Computer Engineering)
Molisch, Andreas F. (Electrical Engineering, University of Southern California)
Schmuland, Byron (Mathematical and Statistical Sciences)
Department of Electrical and Computer Engineering

Date accepted
Graduation date
Doctor of Philosophy
Degree level
The importance of cooperative relaying communication in substituting for, or complementing, multiantenna systems is described, and a brief literature review is presented. Amplify-and-forward (AF) and decode-and-forward (DF) relaying are investigated and compared for a dual-hop relay channel. The optimal strategy, source and relay optimal power allocation, and maximum cooperative gain are determined for the relay channel. It is shown that while DF relaying is preferable to AF relaying for strong source-relay links, AF relaying leads to more gain for strong source-destination or relay-destination links. Superimposed and selection AF relaying are investigated for multirelay, dual-hop relaying. Selection AF relaying is shown to be globally strictly outage suboptimal. A necessary condition for the selection AF outage optimality, and an upper bound on the probability of this optimality are obtained. A near-optimal power allocation scheme is derived for superimposed AF relaying. The maximum instantaneous rates, outage probabilities, and average capacities of multirelay, dual-hop relaying schemes are obtained for superimposed, selection, and orthogonal DF relaying, each with parallel channel cooperation (PCC) or repetition-based cooperation (RC). It is observed that the PCC over RC gain can be as much as 4 dB for the outage probabilities and 8.5 dB for the average capacities. Increasing the number of relays deteriorates the capacity performance of orthogonal relaying, but improves the performances of the other schemes. The application of rateless codes to DF relaying networks is studied by investigating three single-relay protocols, one of which is new, and three novel, low complexity multirelay protocols for dual-hop networks. The maximum rate and minimum energy per bit and per symbol are derived for the single-relay protocols under a peak power and an average power constraint. The long-term average rate and energy per bit, and relay-to-source usage ratio (RSUR), a new performance measure, are evaluated for the single-relay and multirelay protocols. The new single-relay protocol is the most energy efficient single-relay scheme in most cases. All the multirelay protocols exhibit near-optimal rate performances, but are vastly different in the RSUR. Several future research directions for fixed-rate and rateless coded cooperative systems, and frameworks for comparing these systems, are suggested.
License granted by Reza Nikjah ( on 2010-12-23 (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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