Abstract
MIMO multi antenna technology can increase the capacity and channel utilization of the communication system without increasing the bandwidth, and become the key technology in the new generation of mobile communication system. However, each channel has its own channel parameters, so in the process of signal transmission, the influence of channel parameters should be considered. When the signal is received, it needs to be restored, which leads to the complexity of the receiving signal. Therefore, this paper proposes a multi antenna precoding algorithm based on M spread spectrum, precoding before sending signal spread spectrum to simplify the signal receiving equipment, and verify the feasibility of the algorithm through system error rate.