Energy-efficient cooperative sensing and transmission in relay-assisted cognitive radio network |
| |
Authors: | Li FENG Yu-jun KUANG Bin-wei WU Xin-chuan FU |
| |
Affiliation: | 1. School of Communication and Information Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;2. Engineering and Technology College,Sichuan Radio and TV University,Chengdu 610073,China |
| |
Abstract: | An innovative EE-oriented cooperative sensing and transmission scheme in relay-assisted cognitive radio networks,called energy-efficient best-relay cooperative transmission (BCT) was proposed.Based on the BCT scheme,mean energy efficiency (MEE) maximization problem with sensing duration and transmitting power as optimization variables was modeled for fading channels under constraint of minimal secondary outage probability.By virtue of Jensen’s inequality,the original optimization problem was decomposed into two relatively independent subproblems which solved sensing duration and power allocation respectively.And for the two subproblems,an efficient cross iteration based algorithm was proposed to obtain the suboptimal solutions.Both analytical and simulation results demonstrate that the proposals can achieve significantly higher EE while enhancing reliability of secondary transmission remarkably compared to non-cooperation single cognitive transmission schemesin high QoS requirement. |
| |
Keywords: | cognitive radio cooperative sensing relay transmission energy efficiency resource allocation |
|
| 点击此处可从《通信学报》浏览原始摘要信息 |
|
点击此处可从《通信学报》下载全文 |
|