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In this letter, a simplified algorithm for designing the precoder at the transmitter for multiple antenna systems with receive correlation over Ricean fading channels is proposed. From the common property of the asymptotic solutions of high and low SNR's, a simple power allocation structure is proposed, which greatly reduce the computational complexity in comparison with the existing precoder schemes. For the case of two transmit antennas, it becomes an optimal precoder. A simple enhancement procedure, which refines the power allocation to further improve the symbol error rate (SER) performance, is also derived. Unlike most of the existing precoder schemes which need expensive computational complexity but cannot guarantee the iterative algorithms to converge, the proposed algorithm is computationally efficient and can converge to the solution fast. Simulation results show that the proposed scheme achieves SER performance close to that of the optimal one, but requires less computational complexity with fast convergence.
Date of Publication: May 2012