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Transmit Power Allocation Scheme for Cooperative Wireless Networks based on Spatial Multiplexing

Power allocation problem in Decode and Forward (DF) wireless cooperative multiplexing communication systems is considered in this paper. We first derived an analytical bit error rate (BER) expression with BPSK modulation at the relays and Zero Forcing Successive Interference Cancellation (ZF-SIC) algorithm at the destination, which gives deep insight to how different power assignments among the source and the relays influence the BER performance. Based on this expression, a new power allocation algorithm is developed by minimizing BER under different power constraints, the effectiveness of which has been validated by both theoretical analysis and Monte Carlo simulations.