Study of LDPC-SSD Performance Based on Precoding System

In order to improve communication system performance in wireless fading channel,this paper proposes LDPC coded Signal Space Diversity(LDPC-SSD) with precoding system.The signal space diversity rotation matrix is considered as an encoder with code rate equal to 1.In this system,a precoder is added before the signal space diversity matrix.At the same time,three pre-encoder design criteria are given.The pre-encoded LDPC-SSD system is simulated in wireless fading channel.Simulation results show that the proposed scheme has better performance than those without pre-encoded LDPC-SSD system in wireless fading channel.