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Does Amplify-and-Forward Cooperative Relay Improve OFDM/OFDMA Ergodic Capacity？ 被引量：1

Does Amplify-and-Forward Cooperative Relay Improve OFDM/OFDMA Ergodic Capacity？
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摘要 The ergodic information rate for Orthogonal Frequency-Division Multiplexing/ Orthogonal Frequency-Division Multiple Access with amplify-and-forward(AF)relaying systems in the presence of frequency offsets is evaluated.Unlike previous work,per-subcarrier adaptive power allocation is performed on each relay to optimize the system ergodic information rate.For a given frequency offset and total number of relays M,the AF ergodic information rate is proven to be a monotonically increasing function of a(the ratio of the power allocated to the source node and the total transmit power),implying that the maximum ergodic information rate can be obtained at α=1(i.e.,there is no cooperative relay).Furthermore,the proof of "cooperative relays cannot improve the AF ergodic information rate in a quasi-static wireless channel" is also provided in this letter. The ergodic information rate for Orthogonal Frequency-Division Multiplexing / Orthogonal Frequency-Division Multiple Access with amplify-and-forward （AF） relaying systems in the presence of frequency offsets is evaluated. Unlike previous work, per-subcarrier adaptive power allocation is performed on each relay to optimize the system ergodic information rate. For a given frequency offset and total number of relays M, the AF ergodic information rate is proven to be a monotonically increasing function of α （the ratio of the power allocated to the source node and the total transmit power）, implying that the maximum ergodic information rate can be obtained at α=1 （i.e., there is no cooperative relay）. Furthermore, the proof of ＂cooperative relays cannot improve the AF ergodic information rate in a quasi-static wireless channel＂ is also provided in this letter.
作者 HUANGFU Wei ZHANG Zhongshan ZHANG Dandan LONG Keping
机构地区 School of Computer and Communication Engineering National Mobile Communications Research Laboratory
出处 《China Communications》 SCIE CSCD 2014年第2期83-89,共7页 中国通信（英文版）
基金 the 863 project No.2014AA01A701,the National Natural Science Foundation of China，Program for New Century Excellent Talents in University，the open research fund of National Mobile Communications Research Laboratory Southeast University，the Research Foundation of China Mobile,and the Foundation of Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services
关键词 中继系统 OFDMA 遍历 放大 转发 正交频分复用 信息速率 协同 cooperation amplify-ano-forward （AF） ergodic information rate frequency offset Orthogonal Frequency-Division Multiplexing （OFDM） OrthogonalFrequency-Division Multiple Access（OFDMA）
分类号 TN925.93 [电子电信—通信与信息系统] TP360.3 [自动化与计算机技术—计算机系统结构]
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参考文献18

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China Communications
2014年 第2期

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