摘要
为了进一步降低分层空时接收机的球形译码复杂度,提出了一种分组球形译码算法。接收对信号矢量的分量进行分组,每个分组内部采用球形译码算法进行检测,而各个分组之间通过判决反馈的方式进行干扰抵消。由于在各个分组内部进行球形译码,大大降低了最坏情况下的计算量,从而简化了接收机复杂度。计算机仿真结果表明,新算法能够明显的降低接收机译码过程的计算量。
In order to further reduce the computation complexity of sphere decoding (SD) based layered space-time codes receiver, a new receiver algorithm with grouping sphere decoding structure is presented. The elements of signal vector are divided into several groups. The receiver performs sphere decoding for the elements within the same group. The already detected groups are cancelled by using decision feed equalization. Since the sphere decoding are performed in each group separately the worst case complexity of sphere decoding is reduced dramatically. Simulation results show that the decoding complexity of the new algorithm is much lower compared with that of the original sphere decoding algorithm while still maintaining reasonable performance.
出处
《电路与系统学报》
CSCD
北大核心
2008年第5期22-25,共4页
Journal of Circuits and Systems
基金
国家自然科学基金资助项目(60702060)
西安电子科技大学研究生创新基金资助项目(050710)
关键词
球形译码
分层空时码
复杂度
sphere decoding (SD)
layered space-time codes
complexity