Hardware Efficient Signal Detector Based on Lanczos Method for Massive MIMO Systems

Minimum mean square error hometd has proved its superiority for signal detection in massive multiple-input multiple-output (MIMO) systems for its near-optimal performance. However, the detection efficiency is restrained by a high computation complexity and low parallelism operation of matrix inversion. This paper presented a hardware efficient signal detector based on low complexity Lanczos Method, which replaced the matrix inversion with a series iterations of linear equation and reduce the computational complexity form O(N-T(3)) to O(N-T(2)) where N-T denotes the number of users. According to the algorithm, a signal detector for 128x8 MIMO system is designed and implemented using TSMC 65 nm CMOS technology. The results are 0.441 Mbps/mW (throughput/power) and 206.55 Mbps/mm(2) (throughput/area), which are increased by 2.4 x and 1.82 x that of recently proposed Neumman method.