最小均方误差判决和自适应判决反馈均衡器设计实现.pdfVIP

35 6 上 海 交 通 大 学 学 报 V ol. 35 N o . 6 200 1 6 J O U RN A L O F SHA N GHA I J IA O T O NG U N IV ERSIT Y J un. 200 1 : 1006-24 67 2001) 06-0897-05 朱小刚, 　诸鸿文, 　戎蒙恬 , 2000 30) : 介绍了基于F IR 和IIR 的采用最小均方误差 M M SE) 法的判决反馈均衡器, 针对该 法的缺点提出了两种采用自适应 法的判决反馈均衡器: L M S 法和CM A 法, 对这些 法的 仿真表明了各自的性能和优缺点, 在此基础上提出了一种改进的混合 法. 仿真表明, 该 法只需 要少量的训练序列, 性能比CMA 法有明显的改进. : 判决反馈均衡器; 常数模 法; 差错扩散; 波特间距均衡; 分段均衡; 符号估计错误比 : T N929. 5 : A Design Realizat ion of Adapt ive and Blind Adapt ive Decision Feedback Equalizer ZH U X iao-gang, ZH U H ong -wen, RON G Meng-tian Dept . of Elect ronic Eng . , Shanghai Jiaot ong Univ. , Shanghai 200030, China) Abstract: T his paper int roduced t he desig n real iz at ion o f F IR-and IIR -based decision f eedback equalizer w hich adopt s M M SE algo rithm . A imed at it s def ault s , t w o adapt ive decisio n feedback equaliz ers are brought f orw ard , one ado pt s t he L M S alg orit hm and the ot her ado pt s t he CM A algor it hm. T he det ailed sim ulat ion result s of t hese algo rithms w ere giv en and their perf orm ance w as analyzed . Som e im pro vement t o these t w o alg orit hms was made by put t ing f orw ard a hybrid al gorit hm. T he simulation result illu st rat es it oper at es bet t er t han CM A al gorit hm. : ; ; ; - Key words decisio n f eedback equalizer const ant m odulu s alg orit hm error pro pagat ion Baud spaced ; - ; equalizat ion fractionally spaced equalizat io n sy mbol estim at ion erro r r at e DF E) , DF E , SER SER Sy