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| Joint Power Allocation and Adaptive M-QAM Algorithm in Cooperative System |
| CHEN Yong, ZHAN Ao, HE Chen, JIANG Ling-Ge |
| (Information Transmission and Processing Lab., Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract In a decode-and-forward Rayleigh fading system with relay nodes, this paper derived a tight upper bound on symbol error rate (SER) in the high signaltonoise ratio (SNR) regime, and then proposed a joint power allocation and adaptive M-QAM algorithm. The algorithm requires transmission nodes to have only the channel statistic state information (CSSI), which spends fewer overheads than power schemes with channel instantaneous state information (CISI). The simulation results show that the derived upper bound approximates the Monte Carlo results and the proposed algorithm achieves performance gain.
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Received: 25 May 2011
Published: 28 June 2012
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