OFDM多跳中继系统的子载波功率分配

doi:10.13190/jbupt.200802.59.099

北京邮电大学学报 ›› 2008, Vol. 31 ›› Issue (2): 59-63.doi: 10.13190/jbupt.200802.59.099

OFDM多跳中继系统的子载波功率分配

李佳宁，官磊，张建华，李晓帆，张平

北京邮电大学电信工程学院, 北京 100876

收稿日期:2007-06-11 修回日期:1900-01-01 出版日期:2008-04-28 发布日期:2008-04-28
通讯作者: 李佳宁

Subcarrier Power Allocation in OFDM Multi-Hop Relaying System

LI Jia-ning, GUAN Lei, ZHANG Jian-hua, LI Xiao-fan, ZHANG Ping

School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2007-06-11 Revised:1900-01-01 Online:2008-04-28 Published:2008-04-28
Contact: LI Jia-ning

摘要/Abstract

摘要：

针对非再生和再生两种中继方式，研究了宽带正交频分复用（OFDM）中继系统的子载波功率分配问题。首先在2跳非再生中继方式基础上，推导并给出了2跳再生中继方式下的等效信道增益；然后利用注水定理在子载波对间进行功率分配；最后把上述结论推广到多跳中继系统中。仿真结果表明，相比直传系统和平均功率分配机制，最优功率分配的OFDM中继系统有明显的容量增益，且多跳中继系统能有效扩大覆盖范围。

关键词: 协作传输, 功率分配, 子载波对, 等效信道增益

Abstract:

Subcarrier power allocation in broadband orthogonal frequency division multiplexing（OFDM） relaying system is addressed for the nonregenerative and regenerative relaying mode. Firstly, based on the two-hop nonregenerative relaying system, an equivalent channel gain model for the two-hop regenerative relaying system is induced. Afterwards, the overall transmit power is allocated to the subcarrier pairs using water-filling approach. Finally, the above conclusions are generalized to the multi-hop relaying system. Simulation shows that the proposed power allocation algorithm can achieve a higher system capacity than both the direct transmission system and uniform power allocation scheme, and the multi-hop relaying system can efficiently enlarge the coverage.

Key words: cooperative transmission, power allocation, subcarrier pair, equivalent channel gain

中图分类号:

TN911.2

李佳宁，官磊，张建华，李晓帆，张平. OFDM多跳中继系统的子载波功率分配[J]. 北京邮电大学学报, 2008, 31(2): 59-63.

LI Jia-ning, GUAN Lei, ZHANG Jian-hua, LI Xiao-fan, ZHANG Ping
. Subcarrier Power Allocation in OFDM Multi-Hop Relaying System[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2008, 31(2): 59-63.

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OFDM多跳中继系统的子载波功率分配

Subcarrier Power Allocation in OFDM Multi-Hop Relaying System

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