MMSE iterative soft interference cancellation algorithm using transmit power allocation scheme in V-BLAST system

In the V-BLAST system, the minimum mean square error (MMSE) iterative soft interference canceller is a popular soft-input/soft-output (SISO) detector for the turbo receiver. Link adaptation is a good scheme to improve performance in a wireless system. In the paper, we propose a modified algorithm of MMSE iterative soft interference cancellation detector with variable transmission power in each antenna, and propose an effective transmit power scheme to improve bit error rate (BER) performance. This scheme requires small feedback overhead. By uncoded system simulation, it is found that the modified V-BLAST system with transmit power allocation outperforms the conventional V-BLAST system greatly.