This thesis is targeted at precoding methods and resource allocation for the downlink of
fixed multi-user multi-antenna broadband wireless systems. We explore different utilizations
of precoders in transmission over frequency-selective channels. We first consider
the weighted sum-rate (WSR) maximization problem for multi-carrier systems using
linear precoding and propose a low complexity algorithm which exhibits near-optimal
performance. Moreover, we offer a novel rate allocation method that utilizes the signalto-
noise-ratio (SNR) gap to capacity concept to choose the rates to allocate to each
data stream. We then study a single-carrier transmission scheme that overcomes known
impairments associated with multi-carrier systems. The proposed scheme utilizes timereversal
space-time block coding (TR-STBC) to orthogonalize the downlink receivers and
performs the required pre-equalization using Tomlinson-Harashima precoding (THP).We
finally discuss the strengths and weaknesses of the proposed method.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/25728 |
| Date | 06 January 2011 |
| Creators | Khanafer, Ali |
| Contributors | Lim, Teng Joon, Doostnejad, Roya |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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