A New Nonlinear Precoding Algorithm

A novel nonlinear algorithm combined with lattice reduction technique and traditional tomlinson-harashima precoding (THP) algorithm is proposed in this paper, which intends to solve the problem of high bit error rate (BER) from traditional THP algorithm when the channel is in bad condition. The multiple-input multiple-output (MIMO) practical channel matrix can be transformed orthogonally by using the lattice reduction technique. As a result, the system BER could be improved and the user fairness could be ensured as well. Simulation result shows that two particular proposed algorithms can significantly improve the BER performance of the MIMO system. As the signal-to-noise ratio increases gradually, the system performance would be better and better.