This paper proposes a scheme of iterative precoding between the transmitter and the relay end that can effectively suppress multi-user interference in order to solve the inter-user interference problem in multi-user transmission in a multi-relay MIMO communication system. The scheme first performs multi-relay joint zero-forcing precoding at the relay end, and then treats the base station and multiple users as a point-to-multipoint MIMO channel. It adopts a precoding method that maximizes the signal-leakage-to-noise ratio to further eliminate the interference between users at the transmitter end, while avoiding the influence of noise amplification. Then, through multiple iterations of precoding at the relay end and precoding at the transmitter end, it better maintains the performance advantage brought by the spatial diversity introduced by multi-relay parallel transmission, effectively suppresses the interference between users, and obtains a higher system and capacity.
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