Transmit Power Allocation for Virtual V-BLAST System in Wireless Sensor Networks
Haitao Liu · Jisuanji fangzhen · 2008
Considering energy-constraint problem in wireless sensor networks, a virtual V-BLAST system, which is applicable to wireless sensor networks, was presented, and the transmit power allocation (TPA) scheme for bit-error rate (BER) minimization of each sensor node was investigated. An optimal scheme based on KKT condition, as well as a suboptimal scheme based on equal signal-interfere-noise ratio (SINR) were proposed. Simulations show that the virtual V-BLAST system adopting the proposed TPA scheme provides a significant improvement in transmission performance compared with the conventional V-BLAST system with equal power allocation scheme. When system BER is given, the TPA proposed will save each sensor node’s transmitting power, so as to prolong lifetime of wireless sensor networks.