空时编码技术在OFDM系统中的研究  

Study on Space-time Coding Technique in OFDM System

作　　者：宋章瑜 荣定秀 张翠翠 

机构地区：[1]安徽省阜阳市无线电监测站,安徽阜阳236000 [2]安徽省黄山市无线电监测站,安徽黄山245000 [3]安徽省广播电视科研所,安徽合肥230000

出　　处：《通信技术》2010年第7期46-48,51,共4页Communications Technology

摘　　要：正交频分复用(OFDM)技术是一种多载波调制技术,其子载波之间相互正交,可以高效地利用频谱资源。空时编码是一种用于多发射天线的编码技术,该编码在多根发射天线和各个时间周期的发射信号之间能够产生空间域和时间域的相关性,从而使接收机克服多入多出(MIMO)信道衰落和减少发射误码率。这两种技术的结合,实现了最大分集增益,误码性能得到很好改善,而且具有系统实现复杂度低的特点。OFDM（Orthogonal Frequency Division Multiplexing） technology is a multi-carrier modulation technique,its sub-carriers orthogonality with each other could make efficient use of the spectrum resources.Space-time coding is an encoding for multi-transmitting antenna technology,which could,in between the multi-transmitting antennas and the transmission signal of various time periods,produce spatial domain and time domain correlation,thus allowing the receiver to overcome the MIMO（multi-Input Multiple-Output） channel fading and reduce the emission error rate.The combination of these two technologies could achieve the maximum diversity gain,improve the bit error performance,and realize low-complexity system implementation.

关 键 词：OFDM 空时编码 MIMO 分集增益 

分 类 号：TN915[电子电信—通信与信息系统]