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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 會議論文  >  Capacity analysis and power allocation under imperfect channel estimation for AF-based cooperative relay systems

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/83649

    Title: Capacity analysis and power allocation under imperfect channel estimation for AF-based cooperative relay systems
    Authors: Chin-Liang Wang;Jyun-Yu Chen;Hung-Chin Wang
    教師: 王晉良
    Date: 2012
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Proceedings of the 2012 IEEE Global Communications Conference (Globecom 2012), Anaheim, CA, 2012, Dec. 3-7, Pages 4899-4904
    Keywords: amplify-and-forward
    capacity lower bound
    channel estimation
    cooperative communication
    power allocation
    Abstract: In this paper, we investigate the effect of channel estimation errors on the capacity of amplify-and-forward cooperative relay systems. Since an exact capacity expression in the presence of channel estimation errors is difficult to be found, we turn to derive its lower bound instead. Accordingly, by maximizing the derived lower bound, we propose power allocation schemes for both single-relay and multi-relay systems. For single-relay systems, an analytical solution for inequality constrained problem is too complicated to be obtained. Thus, we propose a gradient descent algorithm with a log-barrier function to solve the inequality constrained problem. For multi-relay systems, in terms of the channel estimates and the corresponding mean-squared errors, we provide a water-filling solution for the optimal power allocation among the relays. Simulation results show that the proposed power allocation schemes yield capacity gain compared with equal power allocation at low to medium signal-to-noise ratios.
    Relation Link: http://www.ieee.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/83649
    Appears in Collections:[電機工程學系] 會議論文
    [通訊工程研究所] 會議論文
    [電腦與通訊科技研發中心] 會議論文

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