一种循环相关结构酉空时星座的低复杂度译码方法

提出了一种改进的酉空时码检测算法，根据星座中信号间的循环相关特性将星座分组，每组中的信号均与该组的中心信号具有较强的相关性．收方依据接收信号与各个分组中心信号之间的相关性判断接收信号所属的分组，通过在选定分组中的搜索得到对发送信号的估值．由于译码过程避免了最大似然检测对整个星座的遍历计算，因而计算复杂度低．仿真结果表明，合理选择分组参数能够以较小的性能损失换取译码复杂度的降低．

Low-complexity decoding of unitary space-time constellation with the circulant correlation structure

A modified decoding algorithm for unitary space-time codes is presented, in which the decoding search is based on the groups classified by the circulant correlation of the signal points in the constellation. The decoder estimates the group to which the received signal belongs first. The decision is made after searching in the selected group. Only the central signals of each group and the signals within the selected group are considered, and lower decoding complexity is obtained compared to maximum likelihood decoding. Simulation results show that the proposed algorithm can result in an acceptable performance with much lower decoding complexity.