An Energy Detection Based Signal Detection Method with Multiple Antennas in Cognitive Radio
In Cognitive Radio systems,the performance of spectrum sensing will directly affect spectrum reallocation.Energy detection (ED) method is one of the most commonly used signal sensing methods in spectrum sensing,due to its low implementation complexity.ED can achieve a good detection performance when the noise variance is known.However in most cases,the noise variance is estimated.To reduce the impact of uncertainty in noise variance.an ED based signal detection method is proposed in this paper.This method exploits multiple antennas in a simple way to obtain the decision statistic as ED does.A technique is proposed to construct the decision statistic so that it is independent of the noise variance.As a consequence,the proposed method can significantly reduce the effect of noise variance uncertainty.Theoretical formulas are derived to describe the probability of detection and the probability of false alarm,which are free of noise variance uncertainty.The simulation results show that the detection performance of the proposed method can outperform the existing ED detection methods when the number of antenna is greater than four.
Cognitive radio signal detection energy detection multiple antennas
Jun Luo Guoping Zhang Hongbo Xu Yu Zhou Weidong Yang
College of Physical Science and Technology Central China Normal University Wuhan, China
国际会议
重庆
英文
187-191
2015-12-19（万方平台首次上网日期，不代表论文的发表时间）