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多用户检测技术是DS/CDMA中的一项关键技术,而天线阵的广泛应用也促使对多入多出系统的研究。该文将两种技术结合在一起,考虑到基站在一般情况下总是知道本小区的多个用户的扩频码,在此半盲意义下研究了将子空间方法应用于多用户检测的技术。这种技术可适用于低速移动台在慢衰落信道下的盲检测。仿真结果表明这种算法相对于只利用一个用户的扩频码的盲检测算法性能有相当大的提高。
Multi-user detection technology is a key technology in DS / CDMA, and the wide application of antenna array has also led to the study of MIMO systems. In this paper, the two technologies are combined. Considering that the base station always knows the spreading codes of multiple users in the cell under normal circumstances, the technique of applying subspace method to multi-user detection is studied in the semi-blind sense . This technique is suitable for low-speed mobile station blind detection in slow fading channels. Simulation results show that the performance of this algorithm is improved significantly compared to the blind detection algorithm using only one user’s spreading code.