The performance of wireless sensor networks is degrade dramatically by fading environment.To improve signal to noise ratio(SINR).Multiple antennas array is set up in the central node of single-hop wireless sensor networks.Through adopting self-adaptive truncation opportunistic beamforming technique and selecting sensor nodes which are in good state
to improve characteristics of fading channel by simulating and analyzing the feedbacks and variation of SINR distribution
self-adaptive truncation opportunistic beamforming technique is proved can improve SINR and the system capacity.