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[1]唐岚,张兴敢,柏业超*.在中继选择系统中的发送功率和调制方式的联合优化方案[J].南京大学学报(自然科学),2014,50(3):350.[doi:10.13232/j.cnki.jnju.2014.03.015]
 Tang Lan,Zhang Xinggan,Bai Yechao.Joint optimization of transmit power and rate in relay selection systems[J].Journal of Nanjing University(Natural Sciences),2014,50(3):350.[doi:10.13232/j.cnki.jnju.2014.03.015]
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在中继选择系统中的发送功率和调制方式的联合优化方案()
     

《南京大学学报(自然科学)》[ISSN:0469-5097/CN:32-1169/N]

卷:
50
期数:
2014年第3期
页码:
350
栏目:
出版日期:
2014-05-31

文章信息/Info

Title:
Joint optimization of transmit power and rate in relay selection systems
作者:
唐岚张兴敢柏业超*
南京大学电子科学与工程学院,南京大学,210093
Author(s):
Tang Lan Zhang Xinggan Bai Yechao
(School of electronic science and engineering, Nanjing, 210093, China)
关键词:
中继选择功率控制自适应调制
Keywords:
relay selection power control adaptive modulation
分类号:
-
DOI:
10.13232/j.cnki.jnju.2014.03.015
文献标志码:
-
摘要:
在传感器网络中,降低网络总功耗和延长网络寿命是网络设计和优化的重要要求。本文研究了采用机会性中继选择的解码前传系统,提出了一种能提高系统功率效率的中继选择调制方式和发送功率的联合优化方案。方案中,源节点和中继节点使用不同的发送功率。在给定误码率和系统参数的条件下,可以通过分布式的计算方法获得最优解。仿真结果表明所提方案能获得比协作MIMO系统更高的功率效率。
Abstract:
For sensor networks, maximizing the network lifetime is the main concern. Since sensor networks are mainly designed to cooperate on some joint task, the design intention is to minimize the total energy consumption in the network instead of minimizing energy consumption of individual nodes. In repetition-based cooperative diversity schemes, each relay requires its own subchannel for repetition. Therefore, full spatial diversity benefit comes at a price of decreasing bandwidth efficiency with the number of cooperating relays. Moreover, total circuit energy consumption also increases with the number of active relays. Especially in short-range applications, the circuit energy consumption is comparable to or even dominates the transmission energy. A simplified technique to achieve spatial diversity in cooperative networks is the opportunistic relaying scheme. The basic idea is to choose the best relay node amongst all available relays through a certain policy. On the other hand, energy and spectral efficiency can be enhanced by employing adaptive transmission techniques, which could fully utilize the time-varying wireless channels by adjusting transmission parameters, such as transmission power and constellation size. In this work, we propose a relay selection scheme to minimize the total energy consumption, which includes both the transmission energy and the circuit energy consumption. The energy efficiency for orthogonal opportunistic decode-and-forward (DF) relaying is improved by optimizing transmit power, rate and relay selection jointly.The proposed scheme allows source and relay nodes to transmit information using different transmit power. Given the target bit-error-rate (BER) and system parameters, the optimization problem involving transmit powers, modulation formats and the relay selection is solved in a distributed manner. The numerical results indicate the proposed scheme can achieve more energy saving than the cooperative MIMO transmission and reception.

参考文献/References:

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备注/Memo

备注/Memo:
国家自然科学基金(61101082)
更新日期/Last Update: 2014-06-01