Research And Simulation On Algebraic Space-Time Coding

Space-time coding is one of the key techniques of the future mobile communications systems. Algebraic space-time coding is a general scheme of space-time coding, which relates algebraic number theory and Diophantine approximation theory into the design of space-time codes. Algebraic space-time codes have full diversities and high coding gains and subsume most of the existence space-time codes as special cases.This thesis focuses on algebraic space-time coding techniques in MIMO system. We propose an improved diagonal algebraic space-time block code and an optimaized threaded algebraic space-time block code. We also implement algebraic space-time codes into WCDMA/HSUPA system.In chapter 1, we introduce the key techniques of the beyond 3G mobil communications system. In chapter 2, we briefly introduce the space time coding techniques and MIMO channel capacity theory.In chapter 3, an improved diagonal algebraic space-time block code (DAST-BC) is proposed by replacing the Hadamard transform employed in the conventional DAST-BC with a novel iterative transform. Computations and simulations show that the improved DAST-BC has larger average of coding advantages and better performance than the conventional DAST-BC.In chapter 4, threaded algebraic space-time block code block code (TAST-BC) is studied. We give an optimized TAST-BC, and then discussion on its diversity gain and coding gain. Though computations simulations, we compare the optimized TAST-BC and other space-time codes including the original TAST-BC.In chapter 5, we firstly introduce HSUPA system and then implement algebraic space-time code to HSUPA system. We give the system design scheme. We simulate the improved HSUPA system in typical environments and give some analysis.In chapter 6, we summarize the whole thesis and point the issues to be further studied.