Joint adaptive power allocation and interference suppression algorithms based on the MSER criterion for wireless sensor networks

• Published in: 浙江大学学报：C卷英文版 Vol. 15; no. 10; pp. 917 - 928
• Main Author: Gui-jie WANG Yun-long CAI Min-jian ZHAO Jie ZHONG
• Format: Journal Article
• Language: English
• Published: 2014
• ISSN: 1869-1951; 1869-196X

In this study, a two-hop wireless sensor network with multiple relay nodes is considered where the amplify-and-forward （AF） scheme is employed. Two algorithms are presented to jointly consider interference suppression and power allocation （PA） based on the minimization of the symbol error rate （SER） criterion. A stochastic gradient （SG） algorithm is developed on the basis of the minimum-SER （MSER） criterion to jointly update the parameter vectors that allocate the power levels among the relay sensors subject to a total power constraint and the linear receiver. In addition, a conjugate gradient （CG） algorithm is developed on the basis of the SER criterion. A centralized algorithm is designed at the fusion center. Destination nodes transmit the quantized information of the PA vector to the relay nodes through a limited-feedback channel. The complexity and convergence analysis of the proposed algorithms are carried out. Simulation results show that the proposed two adaptive algorithms significantly outperform the other previously reported algorithms.