一种适合MIMO-OFDM系统的新型VBLAST检测算法

Study on Novel VBLAST Detection Algorithm for MIMO-OFDM System

提出了一种适合MIMO-OFDM系统的星座映射VBLAST迫零检测算法。该算法在接收端从整个发射星座空间中连续并循环映射,作为最先检测底层信号,以最大限度提高最先检测层的差错性能,再对余下接收信号采用传统ZF检测算法;最后,根据最大似然准则,确定最优一组检测信号作为译码结果。该算法主要克服ML算法复杂度高和单纯ZF算法性能差的缺点。仿真结果表明,该算法具有比ZF算法更优的性能,在误码率为10-3数量级上有3~4 dB的性能改善,且复杂度较低。

A novel constellation mapping VBLAST zero-forcing（ZF） detection algorithm is proposed for MIMO-OFDM system,in which cycle and successive mapping of constellation points from the entire space were made at the receiver,as the first detected underlying signals,to maximize the performance of the first detected layer.And for remaining received signals,traditional ZF detection algorithm were used.A set of optimal detection signals was defined as decoding result based on the maximum likelihood criterion.The proposed algorithm overcomes disadvantages of ML and ZF algorithms in complexity and performance.Simulation results showed that the algorithm had a superior performance over ZF algorithm,a 3-4 dB improvement for a bit error rate of 10-3 and lower complexity.