针对国标的一种单载波时频混合均衡方案  

A Method for SC -HDFE in DTTB

作　　者：尚文静[1] 赵芳蕾[1] 宫丰奎[1] 葛建华[1] SHANG Wen-jing, ZHAO Fang-lei, GONG Feng-kui, GE Jian-hua （National Key Lab on Integrated Service Network, Xi＇an Electronic Science ＆ Technology University, Shaanxi Xi＇an 710071, China）

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《中国有线电视》2007年第19期1802-1805,共4页China Digital Cable TV

基　　金：国家“863计划”资助项目（2006AA012270）.

摘　　要：按照已出台的国家数字电视地面广播传输标准，在传统单载波时域均衡的基础上，对时频混合均衡进行了改进。新的方案不用搬移重构频域循环特性，直接采用4375点的FFT变换，该方案基于LMS算法简化计算，并利用PN序列初始化反馈均衡器，从而大大提高了收敛速度。仿真结果表明，新的方案可以消除高信噪比时的错误平层，比一般频域均衡的误符号率性能提高2dB。An improved method of HDFE based on the traditional SC - TDE for Chinese national standard on DTTB（ digital television terrestrial broadcasting）is proposed in this paper. 4375 -point FFT operation is applied in this method without using cyclic restoration. The method can simplify the calculation based on the LMS algorithms, and initialize the DFE by PN extension. So the convergence speed of equalizer is highly enhanced. The simulation results show that the proposed method can reduce the error floor at high SNR, and get about 2 dB improvement over the conventional FDE.

关 键 词：单载波 频域均衡 数字电视地面广播 DFE 

分 类 号：TN949.197[电子电信—信号与信息处理;电子电信—信息与通信工程]