放大转发协作中继是否提升OFDM/OFDMA遍历容量?(英) |
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引用本文: | 皇甫伟,张中山,张丹丹,隆克平.放大转发协作中继是否提升OFDM/OFDMA遍历容量?(英)[J].中国通信学报,2014(2). |
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作者姓名: | 皇甫伟 张中山 张丹丹 隆克平 |
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基金项目: | supported by the 863 project No.2014AA01A701;the National Natural Science Foundation of China(under Grants No.61172050);Program for New Century Excellent Talents in University(NECT-12-0774);;
the open research fund of National Mobile Communications Research Laboratory Southeast University(No.2013D12);the Research Foundation of China Mobile;the Foundation of Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services |
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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.
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