Power allocation algorithm for V-BLAST system with channel correlation and estimation error

In this paper, a new transmit power allocation (TPA) algorithm is proposed for Vertical Bell Labs Layered Space-Time (V-BLAST) system with channel correlation and estimation error. At the receiver, the minimum mean squared error (MMSE) rule is adopted for signal detection. At the transmitter, adaptive power allocation scheme based on Lagrange multiplier method is presented to allocate appropriate power to each antenna. However, the bit error rate (BER) performance of V-BLAST system degrades with the increase of channel correlation, then a decorrelation method is proposed based on beam-forming technique. Numerical results demonstrate that the proposed TPA scheme combined with the decorrelation method is more effectively than the traditional equal power allocation. The BER performance of the correlated V-BLAST system can be well improved with the proposed algorithm.