基于频域二值块通序列的TDS-OFDM发射分集  

TDS-OFDM transmit diversity scheme based on binary partial block pass sequences

作　　者：杜邓宝[1] 王劲涛[1] 王军[1] 杨知行 

机构地区：[1]清华大学电子工程系,微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第10期1642-1645,1650,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家“八六三”高技术项目

摘　　要：在数字电视地面广播中,为了消除时域同步正交频分复用(TDS-OFDM)技术在发射分集应用中的相互干扰,提出了频域二值块通序列的设计方法。该序列频域块状连续、正交、自相关性良好,且具有零互相关特性,可以很好地满足TDS-OFDM发射分集系统对时域快速同步和相互干扰消除的要求。分析了用该发射分集系统结构和信道估计算法。仿真结果表明:和传统的单天线低密度校验编码(LDPC)系统相比,该发射分集系统在慢衰落信道下可以获得1～3 dB的分集增益。A design method for digital television terrestrial broadcasting was developed for binary partial block pass （BPBP） sequences to eliminate mutual interference using training sequences for time-domain synchronous orthogonal frequency division multiplexing （TDS-OFDM） systems with transmit diversity. The BPBP sequences are block consecutive, orthogonal in the frequency domain, and have good autocorrelation and zero cross correlation properties. The TDS OFDM transmit diversity padded by BPBP sequences as guard intervals provides fast synchronization in the time domain and eliminates mutual interference. The scheme and the corresponding channel estimation method are given in detail. Simulations with low density parity check （LDPC） coding show that the scheme can obtain 1 - 3 dB gains compared with single input single output （SISO） systems over slow fading channels.

关 键 词：数字电视地面广播 频域二值块通序列 时域同步正交频分复用 发射分集 

分 类 号：TN911.25[电子电信—通信与信息系统]