A Successive SLNR with GMD for Downlink Multi-user Multi-stream MIMO Systems Based on Pre-processing Matrix

摘要

Aiming to co-channel interference (CCI) and multi-stream for LTE downlink multi-user multiple input multiple output orthogonal frequency division multiple (MIMO-OFDM) system, a successive signal to leakage plus noise ratio (SLNR) with geometric mean decomposition (GMD) for downlink multi-user multi-stream MIMO systems based on pre-processing matrix is proposed. The algorithm utilizes precoding matrix based on SSLNR scheme to process emission signal at the transmitter, and the known leakages is canceled by dirty paper coding (DPC) algorithm. GMD is applied to cancel the known leakages, as all subchannels for this system have identical signal noise ratio (SNR), it is more convenient to reduce the influence of gain. Moreover, the received signal is treated by preconditioned matrix, the interference between different users is eliminated in further, the sum-capacity is improved by pre-processing Matrix. Meanwhile, the proposed scheme has no restriction of the number of antennas. The performance improvement is verified by simulation, the proposed scheme has superior bit error rate (BER) performance compared with the existing algorithm, when BER is 10~4, SNR is improved about 4 dB.