MIMO technology has been applied to PLC to meet the demand of PLC for larger capacity and wider coverage, and it can achieve high-speed data transmission. However, the channel of MIMO-PLC system has the characteristics of serious multipath effect and frequency selective fading, and the channel quality of different subcarriers is quite different. Therefore, the existing signal detection algorithms cannot achieve good performance. This paper proposed a detection algorithm based on condition number threshold selection, and used the condition number of the channel matrix to measure the quality of the channel and set the threshold of the optimal condition number. It selected the CLLL-MMSE-SQRD detection algorithm when the condition number of channel was less than or equal to the threshold, and the selected QRD-M detection algorithm when the condition number of channel was greater than the threshold. The simulation results prove that the proposed algorithm can reach the performance of optimal detection algorithm. In the 16QAM modulation mode, the complexity of the proposed algorithm is reduced by 44% compared with the QRD-M detection algorithm, and with the increase of modulation order, the complexity is reduced more obviously.

[2020-01-05] Printed Article /doc/2018.05.0455/v2