改进Turbo-BLAST检测算法及其仿真

An improved detection algorithm and the simulation for Turbo-BLAST system

Turbo-BLAST系统基于MMSE的迭代软干扰消除检测技术可有效克服由于V-BLAST的应用带来的多流干扰,但是在迭代检测译码过程中存在错误传播,并且收敛性较差,尤其在接收天线远小于发射天线时。而MAP迭代检测算法的性能接近最优,但复杂度随发射天线和调制阶数呈指数增长。所以本文把这两种算法相结合,提出改进的SIC-MAP/MMSE检测算法。仿真结果表明,在相同频谱利用率的条件下,这种新检测算法在性能和收敛性上明显优于MMSE的迭代软干扰消除(SIC-MMSE)检测技术。

The soft interference cancellation with MMSE detector can effectively overcomes the multi-stream interference caused by the V-BLAST system, but it suffers error propagation and poor convergence, especially when the receiving antenna is much smaller than the transmitting antenna. The performance of a maximum a posterior （MAP） iterative de- tector is close to optimal, but the complexity increases exponentially with the number of transmit antennas and modulation order. So the combination of the both algorithms, called an improved SIC-MAP/MMSE detection algorithm, is proposed in the paper which makes a compromise between system performance and complexity. The simulation results show that the new algorithm is better than SIC-MMSE on system performance and convergence under the same spectrum efficiency.