Research On Signal Detection Algorithm Based On Super-relaxation Iteration In Massive MIM

Massive Multiple Input Multiple Output(Massive MIMO)technology plays a key role in the Fifth Generation Mobile Communication Technology due to its stable connection,low latency and high data transmission efficiency.However,due to the large number of antennas in massive MIMO systems,the complexity of traditional linear detectors will be too high,so a detector that balances detection performance and computational complexity is required.And considering the complex channel environment of the actual massive MIMO will lead to the degradation of the BER performance of the detection algorithm,it is also very important to study the signal detection problem in the correlation channel.To solve the two problems above,two different iterative detectors based on the Successive Over Relaxation(SOR)iterative are proposed in this paper,which work in the independent identically distribution channel and correlation channel respectively.The main work is as follows1.The existing SOR iterative algorithm detectors are highly affected by relaxation factor in massive MIMO,which makes the stability of the SOR detector poor.This paper proposes a Jacobi-Successive Over Relaxation(JA-SOR)detector which works in massive MIMO systems.The detector first introduces the Jacobi(JA)iterative to optimize the initial solution of SOR.Secondly,the difference vector is used to optimize the iterative formula of the traditional SOR to reduce the dependence on the relaxation factor.The simulation results show that,compared with other SOR-based detectors,the JA-SOR detector has better detection performance.2.Aiming at the poor performance of the SOR detectors in correlation channels,this paper proposes an F-corrected Adaptive Successive Over Relaxation(FA-SOR)detector that works in correlation channels.The detector is able to update the relaxation factor after each iteration,and a non-zero vector is used as the initial solution.The simulation results show that no matter in the independent identically distribution channel or correlation channel,compared with the existing adaptive SOR detectors,FA-SOR can achieve lower bit error rate with lower complexity,and at the same time approach the performance of MMSE detector.