基于可靠性累积概率的球形译码排序

摘要

The decoding order has a deep impact on the complexity of sphere detection. A new ordering scheme for sphere decoding algorithm is presented in this paper which is based on the reliability defined by the accumulated probability of the difference between symbol element and the zero forcing solution.The proposed ordering scheme takes into account the channel states,the receiver signal and the effect of the noise amplification to get the decoding order according to the probability. The simulation results show that the proposed scheme can achieve a significant complexity reduction.%球形译码的信号顺序对译码的复杂度有很大的影响.本文提出了一种新的基于可靠性累积概率的排序算法,该算法以迫零解作为参考软信息,定义各符号与迫零解之差的累积概率作为信号的可靠性度量,译码符号顺序以累积概率从大到小进行,综合考虑了信道状态、接收向量以及迫零算法对噪声的放大影响.仿真结果表明,该算法大大降低了球形译码算法的计算复杂度.