Achievable Rate Performance Analysis for Massive MIMO Relay Transmission

Abstract

Achievable rate is important performance indicator for cooperative massive MIMO relay systems. We analyze the rate performance of a cooperative transmission system based on ZF linear processing. At the same time, relevant factors affecting the rate are discussed, including the number of massive transmitting and receiving antennas array set by the relay station, transmitting power of the relay station and loop interference. The system performance will be affected by the relay station loop interference, resulting in the system rate performance decline. Generally, a large scale transmitting and receiving antenna can be set up on the relay station to avoid the continuous influence of loop interference on system performance. The total achievable rate of the system depends on the minimum achievable rate of the two links from the source station to the receiving end of the relay station, and the transmitting end of the relay station to the destination. We adjusted transmission power which is set by the relay station to make the sum achievable rate increase to a certain extent, that is to say, the minimum achievable rate of the above two links increases. Experimental data show that better achievable speed can be obtained by adjusting the transmission power of the relay end when the signal to noise ratio(SNR) is high. The achievable rate can be improved continuously in the whole channel state signal-to-noise ratio condition by setting different power of relay station simultaneously.