地面数字电视广播系统的发射分集实现  

Transmitter diversity scheme for Chinese digital terrestrial television broadcasting

作　　者：昌文婷[1] 王劲涛[1] 潘长勇[1] 杨知行 

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

出　　处：《清华大学学报（自然科学版）》2010年第10期1699-1702,1707,共5页Journal of Tsinghua University(Science and Technology)

基　　金：高等学校博士学科点专项科研基金(20090002120026);轨道交通控制与安全国家重点实验室(北京交通大学)开放课题基金资助(RCS2009K009)

摘　　要：中国地面数字电视广播系统采用了时域同步正交频分复用(TDS-OFDM)技术。在该系统中实现双天线发射分集时,不同天线发送的训练序列在独立链路上传输,到达接收端时相互之间存在干扰。该文提出了一种有效实现双天线发射分集的帧结构,将一组伪随机序列对经过空时编码后,分别作为双天线发射信号帧中二个帧时隙的帧头序列。基于该帧结构,给出了迭代的信道估计算法,提高了在衰落信道下系统的接收性能,可以改善电视信号的覆盖范围。Chinese digital terrestrial television broadcasting systems use time domain synchronous orthogonal frequency division multiplexing（TDS-OFDM）.When realizing two-antenna transmitter diversity in TDS-OFDM systems,the training sequences sent independently by different antennas will result in mutual interference at the receiver.This paper describes an effective scheme to deal with this interference.After the space-time coding,a pair of pseudo-random（PN） sequences are used to fill two time slots and the two antenna＇s signal frame headers.This frame scheme is used in an iterative channel estimation algorithm to effectively achieve the two-antenna transmitter diversity,improve the system performance especially in fading channels,and increase the coverage area of the television signals.

关 键 词：TDS-OFDM 伪随机序列 空时编码 信道估计 发射分集 

分 类 号：TN911[电子电信—通信与信息系统]