Precoding and Resource Allocation for Multi-user Multi-antenna Broadband Wireless Systems

• Main Author: Khanafer, Ali
• Other Authors: Lim, Teng Joon
• Language: en_ca
• Published: 2010
• Subjects: Resource Allocation; Precoding; MIMO-OFDMA; Stream Rate Allocation; Time-Reversal Space-Time Block Coding; Tomlinson-Harashima precoding; Weighted Sum-Rate MAximization; Weighted MMSE Minimization; 0544
• Online Access: http://hdl.handle.net/1807/25728

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.