摘要
视距路径的存在使多天线信道矩阵的条件数增加,造成同步多载波分层空时码的线性检测性能严重下降甚至失效。针对这一现实问题,该文提出了一种新的发射信号设计方法:在频域上将每个天线上的多载波信号异步发射。在莱斯信道中得到了联合迫零检测的误比特率表达式,并在未编码和Turbo编码情况下与同步多载波分层空时码进行了仿真对比。理论分析和仿真结果表明:异步多载波发射结构能够突破同步多载波分层空时码对接收天线数的限制,利用线性检测方法可以获得系统的最大可能空间分集度。
The presence of the Line-Of-Sight（LOS） component will increase the condition number of the multi antenna channel matrix,and severely reduce detection performance of the synchronous multi-carrier layered space-time code.As a remedy to this problem,a multi-carrier layered space-time architecture is proposed based on the asynchronous transmission of each antenna＇s signal in frequency domain.Closed-form Bit Error Rate（BER） expressions of the Zero Forcing（ZF） joint detection for a Ricean fading channel is derived for both coded and uncoded modulation.Comparisons are also made with those obtained in a traditional synchronous system.The theoretical analysis and simulation results show that the asynchronous multi-carrier transmission scheme can break through the antenna number limitation of synchronous multi-carrier layered space-time code system,while achieving full receive diversity with low complexity linear detector.
出处
《电子与信息学报》
EI
CSCD
北大核心
2012年第3期664-669,共6页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60902027
60832007
60901018
U1035002/L05
61001087
61101034)
国家科技重大专项(2010ZX03003-002-01
2011ZX03001-006-01
2010ZX03007-003)
中央高校基金(ZYGX2010J012
ZYGX2009J008
ZYGX2009J010)资助课题
关键词
无线通信
分层空时码
多载波
异步发射
莱斯信道
Wireless communication
Bell laboratories LAyered Space-Time（BLAST）
Multi-carrier
Asynchronous transmission
Ricean channel
