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Does Amplify-and-Forward Cooperative Relay Improve OFDM/OFDMA Ergodic Capacity?

被引：1
|
作者：
Huangfu Wei [1 ]
Zhang Zhongshan [1 ,2 ]
Zhang Dandan [1 ]
Long Keping [1 ]
机构：
[1] Univ Sci & Technol Beijing, Beijing Engn & Technol Ctr Convergence Networks &, Sch Comp & Commun Engn, Beijing 100083, Peoples R China
[2] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China
来源：
CHINA COMMUNICATIONS | 2014年 / 11卷 / 02期
基金：
中国国家自然科学基金;
关键词：
cooperation; amplify-and-forward (AF); ergodic information rate; frequency offset; Orthogonal Frequency-Division Multiplexing (OFDM); Orthogonal Frequency-Division Multiple Access (OFDMA); OFDMA UPLINK TRANSMISSION; INFORMATION RATE ANALYSIS; JOINT OPTIMIZATION; CELLULAR NETWORKS; DIVERSITY; STRATEGIES; DESIGN;
D O I：
10.1109/CC.2014.6821740
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
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 alpha (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 alpha=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.
引用
收藏
页码：83 / 89
页数：7
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