Abstract:

In MIMO communications,the reduction of inter-symbol interference and the impact of noise is very important a topic.In this paper,we first give a general MIMO communication system model diagram,followed by a simulation of the similarities and differences between the three different linear detection algorithms.Then spread spectrum technology and QC-LDPC channel coding techniques are cascaded at the input.The theory deduction and simulation results are given by comparing the relation between the cascade system and general MIMO system SNR and BER.The results show that the cascading reduces inter-symbol interference and noise,and is significantly better than the general MIMO system.

Key words: MIMO;linear detection;spread spectrum;QC-LDPC