Design of Delay-Tolerant Space-Time Codes with Linear MMSE Receivers

This paper presents a new design method for delay-tolerant linear dispersion codes (DT-LDCs) for asynchronous cooperative communication networks. We consider a system that is equipped with linear minimum mean square error (MMSE) receiver. Based on the DT-LDC framework, we propose a new design method to yield DT-LDCs that approach near-optimal capacity as well as minimum average MSE. The proposed design employs stochastic gradient algorithm to guarantee the local optimum. Moreover, it is improved by using simulated annealing type optimization to approach the global optimum. Simulation results confirm the performance of the newly-proposed delay-tolerant LDCs.