可快速迭代解码的非相干空时编码

提出了一种基于满分集准正交空时分组码构造非酉非相干空时码的方法,该编码能够最大限度地利用信道的相关时间来提高码率.根据代数分集的定义,证明了所构造的编码可获得满代数分集.为了能够充分利用编码的准正交结构简化解码,选用了基于期望最大化的迭代算法对所构造的编码进行解码,该算法能够极大地减小最优解码器的复杂度.仿真结果表明,迭代解码算法可快速收敛且其能够很好地对解码复杂度和误码性能进行折衷.

A Non-Coherent Space-Time Code with Fast Iterative Decoding

A non-unitary non-coherent space-time code is proposed based on full diversity quasi-orthogonal space-time block code. This code can make use of the coherent time of the wireless channel as possible as it can. The conclusion that the proposed code can achieve full algebraic diversity is proved in terms of the definition of algebraic diversity. To exploit the quasi-orthogonal structure for simple decoding an iterative decoding algorithm based on EM algorithm is employed to the proposed non-coherent code. Simulation results demonstrate the iterative decoding algorithm can converge fast and it enjoys a favorable performance-complexity tradeoff.