一种基于矩阵旋转的正交空时分组码

Tarokh等人(1999)运用正交设计理论证明了当发射天线数大于2时,不存在可以获得最大分集增益和最大传输速率的复正交空时分组码。而以牺牲正交性和部分分集增益为代价来获得更高传输速率的非正交空时分组码又会使误码性能降低。该文通过对非正交空时分组码信道相关矩阵采用矩阵旋转的方法,提出了一种可以获得最大传输速率、部分分集增益以及接收端线性解码的正交空时分组码。仿真结果表明,该方案与已有典型的空时分组码相比,具有较好的误码性能。

An Orthogonal Space-Time Block Code Based on Matrix Rotation

According to the theory of orthogonal designs, Tarokh et al. (1999) proved that a complex orthogonal space-time block code that provides full diversity and full transmission rate is not feasible for more than two antennas. Whereas the non-orthogonal space-time block codes which obtain higher transmission rate at the cost of orthogonality and partial diversity gain may degrade the performance. By rotating the channel correlation matrix of the non-orthogonal space-time block code, this paper proposes an orthogonal rate-one space-time block code which provides partial diversity but can be linearly decoded at the receiver. Simulation results show that the scheme has better Bit Error Rate (BER) performance compared to the existing typical codes.