认知中继网络中基于能效的协作传输技术研究

doi:10.11959/j.issn.1000-436x.2017108

Abstract

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.

Key words: cognitive radio, cooperative sensing, relay transmission, energy efficiency, resource allocation

CLC Number:

TN92

Li FENG,Yu-jun KUANG,Bin-wei WU,Xin-chuan FU. Energy-efficient cooperative sensing and transmission in relay-assisted cognitive radio network[J]. Journal on Communications, 2017, 38(5): 145-156.

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