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Performance analysis of cooperative relaying networks
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Shi, Rui (Researcher in engineering) (2014) Performance analysis of cooperative relaying networks. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2715846~S1
Abstract
Recently, cooperative diversity system has become an effective way to
mitigate multipath fading. This thesis concentrates on the performance analysis
of cooperative diversity relaying system by considering several realistic
limitations. These limitations are likely to exist in the real network and may
cause the system performance degradation significantly. Consequently, it is
valuable to produce the more accurate system evaluation for the development
of network. Our research work is immersed in amplify-and-forward (AF) relaying
protocol due to its simplicity. The effect of limitations such as correlated
channels, signal-to-noise ratio (SNR) estimation errors and feedback delay are
further studied. At first, we analyze the performance of a single antenna dualhop
AF relaying system with correlated links in Nakagami-m fading channels
by taking account of blind fixed-gain relaying (BFG), semiblind fixed-gain
relaying (SFG), and variable-gain relaying (VG) schemes. Numerical results
show that the link correlation can have a considerable effect on these schemes
for specific ways of correlation, especially when the correlation coefficient is
larger than 0.5. Then we investigate the effect of SNR estimation error which
assumes relay selection performed under imperfect channel gain as well as imperfect
noise power in Rayleigh fading channels. The numerical derivations of
outage probability together with PDF and CDF of the estimated end-to-end
SNR are verified and analyzed by simulation results. Finally, regarding the impact of outdated channel state information (CSI) due to feedback delay, we
evaluate the performances of several generalized relay selection schemes based
on multihop cooperative diversity over Rayleigh fading channels. Our results
show that increasing the hop index may lead different peformance degradations
for different relay selection schemes. Furthermore, it is also shown that selecting
more relays in one hop does not necessarily lead to better performance.
Again, simulation results verify the correctness of numerical derivation of outage
probability.
Item Type: | Thesis (PhD) |
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering |
Library of Congress Subject Headings (LCSH): | Network performance (Telecommunication), Signal processing, Wireless communication systems |
Official Date: | January 2014 |
Institution: | University of Warwick |
Theses Department: | School of Engineering |
Thesis Type: | PhD |
Publication Status: | Unpublished |
Supervisor(s)/Advisor: | Chen, Yunfei |
Extent: | xx, 141 leaves : charts. |
Language: | eng |
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