低复杂度的满速率和部分分集多天线空时块码及性能

在现有几种满分集空时码的基础上,提出两种满速率和复正交的多天线空时块码方案。一种是基于时分双工(TDD)模式下最大信道增益而设计的;另一种则不再限于TDD方式,具有普遍适用性。同时利用Turbo码良好的抗衰落信道的突发错误能力,来进一步提高所提方案性能。与满分集多天线空时块码相比,该方案可实现满速率、低复杂度和部分分集,具有相对多的空间冗余信息,从而级联Turbo码后可有效弥补部分分集所带来的性能损失。仿真结果也表明在相同系统容量和级联码的情况下,所提方案比其它相应的满分集空时码有着更低的误比特率。

Performance of full-rate and partial-diversity multiple antennas space-time block code with low complexity

On the basis of existing full-diversity space-time block coding (STBC), two full-rate complex orthogonal STBC schemes for multiple antennas were proposed. One was based on time division duplex (TDD) mode; the other had general application without being limited in TDD mode. Meanwhile, Turbo coding was adopted to improve the performance of proposed schemes further by utilizing its good ability to combat the burst error of fading channel. Compared with full-diversity multiple antennas STBC schemes, the proposed schemes could implement full rate, lower complexity and partial diversity; and had more spatial redundant information. Thus the concatenation of Turbo coding could effectively compensate for the performance loss due to partial diversity. Simulation results show that on the condition of same system throughput and concatenation of Turbo code, the proposed code schemes have lower bit error rate (BER) than those low-rate and full-diversity codes.