Power Loading by Minimizing the Average Symbol Error Rate on MIMO THP Systems

Nonlinear Tomlinson-Harashima precoding (THP), considered in this paper, is an attractive solution for a scenario where a transmitter serves multiple antennas at transmitter and receiver, where cooperation among them is possible. THP solution based on zero forcing (ZF) and minimum mean square error (MMSE) criteria are one of the important techniques to achieve multiple input multiple output (MIMO) channels capacity with reasonable complexity. In this paper, power allocation at transmitter side is shown to be important in performance of THP system. A good solution for power allocation and optimum as well as suboptimum solutions are presented, too. By considering the power allocation, THP structure is generalized as GTHP in order to enable different transmission power per antenna. Simulation results are used to shown the performance advantage attained by the ZF/MMSE THP with power allocation.