Distributed optimal relay selection for spectral efficiency improvement in underlay-paradigm based c

• 作 者: CHEN Dan JI Hong
• 机 构: Key Laboratory of Universal Wireless Communications, Ministry of Education,Beijing University of Pos
• 出 处: 北京理工大学学报（英文版）
• 发表日期: 2012年1期
• 关键词: cognitive radio (CR) cooperative communications relay selection

A distributed best-relay node selection scheme is investigated for cooperative communications with adaptive modulation and coding (MAC) strategy over underlay-paradigm based cognitive radio (CR) networks.The scheme aims to maximize the average spectral efficiency and meanwhile to guarantee that the primary link is provided with a minimum-rate for a certain percentage of time.Simulation results demonstrate that the proposed scheme can significantly improve the spectral efficiency compared with other existing schemes.