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The Impact of CSI and Power Allocation on Relay Channel Capacity and Cooperation Strategies.pdf

发布:2015-09-24约7.53万字共26页下载文档
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The Impact of CSI and Power Allocation on Relay Channel Capacity and Cooperation Strategies Chris T. K. Ng, Student Member, IEEE, Andrea J. Goldsmith, Fellow, IEEE 7 0 0 2 Abstract n a J Capacity gain from transmitter and receiver cooperation are compared in a relay network where the 8 cooperating nodes are close together. Under quasi-static channels, when all nodes have equal average 1 transmit power along with full channel state information (CSI), it is shown that transmitter cooperation 1 v outperforms receiver cooperation, whereas the opposite is true when power is optimally allocated among 6 the cooperating nodes but only CSI at the receiver (CSIR) is available. When the nodes have equal power 1 1 with CSIR only, cooperative schemes are shown to offer no capacity improvement over non-cooperation 1 0 under the same network power constraint. When the system is under optimal power allocation with full 7 0 CSI, the decode-and-forward transmitter cooperation rate is close to its cut-set capacity upper bound, / T and outperforms compress-and-forward receiver cooperation. Under Rayleigh fading in the high SNR I . regime, similar conclusions follow. Cooperative systems provide resilience to channel fading; however, s c capacity becomes more sensitive to power allocation, and the cooperating nodes need to be closer : v i together for the decode-and-forward scheme to be capacity-achieving. Moreover, to realize capacity X r improvement, full CSI is necessary in transmitter cooperation, while in receiver co
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