Adaptive Sphere Decoding for Space-Time Codes of Wireless MIMO Communications

摘要

In this paper, we develop an adaptive sphere decoding technique for space-time coding of wireless MIMO communications. This technique makes use of the statistics of previous decoding results to reduce the decoding complexity of subsequent decoding process. Specially, we propose a method for the determination of the initial sphere radius for the decoding process of future time-frame based on a queue of records of minimum sphere radius obtained from the decoding process of previous time-frames. Concrete methods have been derived for the choice of appropriate queue sizes. Numerical experiment is performed for demonstrating the efficiency of the adaptive technique.