计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2013年
24期
200-204
,共5页
变系数%误差函数%判决反馈
變繫數%誤差函數%判決反饋
변계수%오차함수%판결반궤
variable weighted coefficient%error function%decision feedback
针对严重失真的水声信道,在分析几种常用传统误差函数和判决反馈均衡器(DFE)的基础上,构造了一种变系数加权误差函数,对DFE权向量进行更新,提出了基于变系数加权误差函数的判决反馈盲均衡算法(VCMDFE)。与基于传统误差函数的判决反馈盲均衡算法(CMDFE)相比,新算法能够根据均衡的进度,利用一变系数去调节误差函数数值的大小,以取得比CMDFE算法更快的收敛速度和更低的稳态误差。水声信道的仿真结果验证了该算法的有效性。
針對嚴重失真的水聲信道,在分析幾種常用傳統誤差函數和判決反饋均衡器(DFE)的基礎上,構造瞭一種變繫數加權誤差函數,對DFE權嚮量進行更新,提齣瞭基于變繫數加權誤差函數的判決反饋盲均衡算法(VCMDFE)。與基于傳統誤差函數的判決反饋盲均衡算法(CMDFE)相比,新算法能夠根據均衡的進度,利用一變繫數去調節誤差函數數值的大小,以取得比CMDFE算法更快的收斂速度和更低的穩態誤差。水聲信道的倣真結果驗證瞭該算法的有效性。
침대엄중실진적수성신도,재분석궤충상용전통오차함수화판결반궤균형기(DFE)적기출상,구조료일충변계수가권오차함수,대DFE권향량진행경신,제출료기우변계수가권오차함수적판결반궤맹균형산법(VCMDFE)。여기우전통오차함수적판결반궤맹균형산법(CMDFE)상비,신산법능구근거균형적진도,이용일변계수거조절오차함수수치적대소,이취득비CMDFE산법경쾌적수렴속도화경저적은태오차。수성신도적방진결과험증료해산법적유효성。
For overcoming effect of the underwater acoustic channel on communication quality, a new style of error function weighted by a variable coefficient is proposed, on the basis of analyzing the feature of the usual traditional error functions and Decision Feedback Equalizer(DFE). And a new blind decision feedback equalization algorithm(VCMDFE)based on the new error function is proposed too. In this proposed VCMDFE algorithm, the variable coefficient can adjust the value of the error function according to the progress of equalization, so as to have faster convergence rate and lower residual error than CMDFE. The efficiency of the proposed VCMDFE algorithm is proven by computer simulation with underwater acoustic channels.