Cooperative multiple access channels: Achievable rates and optimal resource allocation  

作　　者：PAN ChengKang CAI YueMing XU YouYun 

机构地区：[1]Institute of Communications Engineering, PLA University of Science and Technology, Nanjing 210007, China

出　　处：《Science in China(Series F)》2009年第8期1428-1438,共11页中国科学（F辑英文版）

基　　金：Supported partially by the National Natural Science Foundation of China (Grant No. 60672079);the Natural Science Foundation of Jiangsu Province (Grant No. BK2006701);the Natinoal High-Tech Research & Development Program of China (Grant No. 2007AA01Z267)

摘　　要：We investigate the multiple access channels （MAC） where sources can cooperate via half-duplex relaying and refer to it as cooperative MAC channels （CMAC）. Assuming perfect channel state information （CSI） at the transmitters and the receivers, we determine the bounds on the achievable rate region of a Gaussian CMAC channel and an inner bound on the outage capacity region of a fading CMAC channel. Based on superposition modulation, a half-duplex cooperative relay scheme with optimal resource allocation is proposed to achieve the bounds of capacity region. Analytical results and simulation results show that the achievable rate region of a Gaussian CMAC channel is larger than that of a Gaussian MAC channel with direct transmission （DT） schemes. But they have the same achievable sum rate. Moreover, the proposed scheme can provide higher outage capacity region than DT schemes in a fading MAC channel due to the fact that sources can share the resources with each other to reduce outages.We investigate the multiple access channels （MAC） where sources can cooperate via half-duplex relaying and refer to it as cooperative MAC channels （CMAC）. Assuming perfect channel state information （CSI） at the transmitters and the receivers, we determine the bounds on the achievable rate region of a Gaussian CMAC channel and an inner bound on the outage capacity region of a fading CMAC channel. Based on superposition modulation, a half-duplex cooperative relay scheme with optimal resource allocation is proposed to achieve the bounds of capacity region. Analytical results and simulation results show that the achievable rate region of a Gaussian CMAC channel is larger than that of a Gaussian MAC channel with direct transmission （DT） schemes. But they have the same achievable sum rate. Moreover, the proposed scheme can provide higher outage capacity region than DT schemes in a fading MAC channel due to the fact that sources can share the resources with each other to reduce outages.

关 键 词：multiple access channel cooperative communication rate region resource allocation 

分 类 号：TN929.533[电子电信—通信与信息系统] F426.61[电子电信—信息与通信工程]