摘要
分析了基于放大前传的两跳正交频分复用接力系统.针对因信号在两跳过程中被置于相同子载波传输而限制系统性能的问题,提出了子载波配对技术,并采用匈牙利算法提出了最优配对方案.进一步提出了基于子带的子载波配对方案.仿真结果表明,子载波配对技术能为系统带来约5dB的增益;基于子带的子载波配对增益略低,但能大大降低信令开销.
An amplify-and-forward （AF） based two-hop orthogonal frequency division multiplexing （OFDM） relaying system was analyzed. Since channel fading of the first hop and second hop is independent, system performance is limited if the signal is transmitted on the same sub-carrier in both hops. In order to solve the problem, a sub-carrier coupling method was proposed. A Hungarian algorithm was adopted to provide the optimal coupling scheme, and furthermore, sub-carrier coupling scheme based on sub-bands was presented. Simulations indicate that sub-carrier coupling can bring about 5 dB gain to the system. Though the gain of sub-carrier coupling scheme based on sub-bands only has a little loss, it can reduce signaling overhead greatly.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2008年第1期135-139,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(60702051)
国家“863计划”项目(2007AA01Z261
2006AA01Z260)
高等学校博士学科点专项科研基金课题(20070013028)
诺基亚公司合作项目
关键词
放大前传
正交频分复用
匈牙利算法
amplify-and-forward
orthogonal frequency division multiplexing
Hungarian algorithm
