基于多中继的双向OFDM系统资源分配算法

doi:10.11959/j.issn.1000-436x.2017050

通信学报 ›› 2017, Vol. 38 ›› Issue (9): 193-200.doi: 10.11959/j.issn.1000-436x.2017050

基于多中继的双向OFDM系统资源分配算法

梁轩伟^1,²,朱琦^1,²,梁广俊^1,²

¹ 南京邮电大学江苏省无线通信重点实验室，江苏南京 210003
² 教育部宽带无线通信与传感网技术重点实验室，江苏南京210003

修回日期:2017-01-19 出版日期:2017-09-01 发布日期:2017-10-18
作者简介:梁轩伟（1991-），男，江苏徐州人，南京邮电大学硕士生，主要研究方向为无线通信、协作通信。|朱琦（1965-），女，江苏苏州人，南京邮电大学教授、博士生导师，主要研究方向为下一代移动通信、宽带无线接入、OFDM 技术、信道和信源编码技术和无线资源动态分配技术等。|梁广俊（1982-），男，安徽芜湖人，南京邮电大学博士生，主要研究方向为无线通信网络中的资源分配与优化、中继通信。
基金资助:
国家自然科学基金资助项目(61571234);国家自然科学基金资助项目(61631020);国家重点基础研究发展计划（“973”计划）基金资助项目(2013CB329005)

Resource allocation scheme in two-way multi-relay OFDM system

Xuan-wei LIANG^1,²,Qi ZHU^1,²,Guang-jun LIANG^1,²

¹ Jiangsu Province Key Lab of Wireless Communications,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
² Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education,Nanjing 210003,China

Revised:2017-01-19 Online:2017-09-01 Published:2017-10-18
Supported by:
The National Natural Science Foundation of China(61571234);The National Natural Science Foundation of China(61631020);The National Basic Research Program of China (973 Program)(2013CB329005)

摘要/Abstract

摘要：

在双向多中继 OFDM 网络中，提出了一种高信噪比下的功率分配与子载波配对的联合算法，与传统的基于中继选择的算法不同，允许所有中继转发同一子载波对，从而提高系统的额外分集增益。该算法在系统总功率受限的条件下，首先应用柯西不等式优化分配了所有中继总功率为定值时各个中继的最优功率，简化原有的最优系统模型；再应用二分法，通过最大化不同子载波对下的等效信道增益计算出源节点与中继节点的功率分配；最后通过凸规划分配不同子载波对的功率，并应用匈牙利算法进行子载波配对，获得最大的系统容量。由于双向多中继网络中功率分配算法过于复杂，目前尚没有计算复杂度较低的最优功率分配方式，该算法大大降低了功率分配的复杂度，并通过仿真结果表明其性能优于最优单中继选择算法和基于中继选择的功率分配算法。

关键词: OFDM, 双向多中继, 功率分配, 子载波配对

Abstract:

A joint optimization scheme for power allocation and subcarrier pairing under high SNR in two-way multi-relay OFDM system was proposed.Unlike those schemes in which relays use subcarriers separately,all the relays were allowed to forward signal on each subcarrier pair for providing much space diversity.With the constraint of total system power,the proposed scheme firstly allocated each relay power with Cauchy inequality with the assuming that the total relay power was fixed.Then the dichotomy was used to calculate the power allocation between the source node and the relay node by maximizing the equivalent channel gain for different subcarrier pairs.Lastly,the power of different subcarrier pairs was allocated by convex programming,and the subcarriers were paired by Hungarian algorithm to obtain the maximum system capacity.There was no optimal power allocation method with low complexity because of the complexity of the power allocation algorithm in two-way multi-relay networks.This algorithm greatly reduces the complexity of power allocation and simulation results show that the proposed scheme outperforms the relay selection scheme and the relays use subcarriers separately scheme.

Key words: OFDM, two-way multi-relay, power allocation, subcarrier pairing

中图分类号:

TN92

梁轩伟,朱琦,梁广俊. 基于多中继的双向OFDM系统资源分配算法[J]. 通信学报, 2017, 38(9): 193-200.

Xuan-wei LIANG,Qi ZHU,Guang-jun LIANG. Resource allocation scheme in two-way multi-relay OFDM system[J]. Journal on Communications, 2017, 38(9): 193-200.

图/表 4

参考文献 11

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基于多中继的双向OFDM系统资源分配算法

Resource allocation scheme in two-way multi-relay OFDM system

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