In order to solve the problem of massive MIMO detection and calculation of communication system with terahertz, the algorithm signal detection with high-complexity based on iterative Newton algorithm is proposed. By improving the initial matrix in Newton iterative algorithm, the addition of step factor, reduce the computing complexity, and improve the speed of convergence; by adding the adjustment factor, the stability, reliability and scene applications of the algorithm are guaranteed. The simulation results show that compared with the traditional algorithm, the algorithm has lower calculation complexity and faster convergence speed. Thenumber of iterations is 3 times, the MMSE algorithm performance can be approached.

Massive MIMO, MMSE, Netwon approximation