Low-complexity capacity-approaching schemes for wireless systems: Design, analysis and applications

This thesis focuses on the low-complexity capacity-approaching schemes for wireless systems. Specifically, we are interested in the detection schemes, coding schemes, cross-layer optimization schemes, as well as diversity schemes. In the work, we first consider the EXIT chart analysis of turbo multiuser detection. We then extend the work to the analysis and optimization of interleave-division multiple-access (IDMA) systems. Since the low-rate coding is an important component for the code-spread IDMA system, we propose the repeat-zigzag-Hadamard (RZH) code, which is a class of low-complexity capacity-approaching low-rate code with a simple encoding structure and flexible coding rate. Performance analysis and optimization of RZH code are considered. Cross-layer optimization of a wireless mesh network with network coding and the phase-sweeping diversity scheme for multiantenna system are also considered.