连续衰落信道下适用于酉空时调制的多符号差分球形译码算法

基于连续衰落信道假设,将一种具有递推形式的近似最大似然(ML)度量嵌入自动球形译码算法中,提出了多符号差分近似自动球形译码(MSDAASD)。该算法适用于一般酉空时星座,克服了准静态信道假设下多符号差分球形译码(MSDSD)的错误平层现象,具有接近ML检测的性能,其平均复杂度在大多数情况下低于相同假设下的判决反馈检测算法。

Multiple symbol differential sphere decoding for unitary space-time modulation in continuous fading

Based on the assumption of continuous fading,a multiple symbol differential approximate automatic sphere decoding(MSDAASD) algorithm was developed by incorporating a recursive form of an approximate maxi-mum-likelihood(ML) metric into automatic sphere decoding.The proposed algorithm is suitable for arbitrary unitary constellations and eliminates the error floor caused by in multiple symbol differential sphere decoding(MSDSD) with quasi-static channel assumption.Compared with decision-feedback detection under the same assumption,MSDAASD achieves similar performance of ML detection with much lower complexity at moderate to high signal-to-noise ratios.