Sorting and Power Allocation-Based THP Precoding Algorithm in VLC System

The pre-coding algorithm is used to reduce channel interference in visible light communication (VLC) system in this paper. After comparing the traditional ZF, MMSE and THP precoding algorithms, it is found that the optimal anti-interference scheme of the system is THP algorithm in 4 x 4 sender and receiver systems. Based on this, the paper proposes an optimized THP algorithm, which alters the row sequence of channel matrix $H$ and controls the emitter power. Simulation results show that the bit error rate (BER) of the system under the power-based THP algorithm is between 10– 5 and 10– 4 , which greatly improves the performance of the system.