单载波频域均衡中的协作分集方法

王荆宁, 沙学军, 谭学治

哈尔滨工业大学通信技术研究所



摘要:

为了克服单载波频域均衡技术中多径衰落对无线通信质量的影响,提出了一种"均衡前向"的协作分集方法.在该方法中协作伙伴把接收到的信号经过频域均衡后再转发到目的节点,并且把"解码前向"与"均衡前向"相结合以提高系统性能.仿真结果表明,协作分集可以有效降低系统的错误概率,并且两种协作方法结合的方法可以比单一方法得到更大的分集增益.协作伙伴的信道状态决定了协作增益的大小,必须综合考虑多个参数来选择合适的协作伙伴.

关键词:  协作分集  单载波频域均衡  均衡前向  协作伙伴选择

DOI：10.11918/j.issn.0367-6234.2011.07.009

分类号:TN929.5

基金项目:国家重点基础研究发展计划资助项目(2007CB310601);黑龙江省博士后基金资助项目(LRB09-019);高等学校博士学科点专项科研基金资助(20092302120001)



Cooperative diversity in single carrier frequency domain equalization

WANG Jing-ning, SHA Xue-jun, TAN Xue-zhi

Communication Research Center,Harbin Institute of Technology,150001 Harbin,China

Abstract:

To overcome the influence of multi-path fading in single carrier frequency domain equalization,this paper proposed "Equalization and Forward" method.In this method the partner equalizes the receiving signal in frequency domain and forward to destination.In addition,the "Equalization and Forward" and "Decoded and Forward" methods are combined to improve the performance,and the impact on cooperative performance of partners’ channel state information is analyzed.The simulation results show that the cooperative diversity can reduce error probability,and the combining method can provide larger diversity gain than single method.Partners’ channel state information determines the diversity gain,so various parameters should be considered to obtain best performance.

Key words:  cooperative diversity  single carrier frequency domain equalization  equalization and forward  partner selection