|
An adaptive equalizer is an equalizer that automatically adapts to time-varying properties of the communication channel.〔S. Haykin. (1996). Adaptive Filter Theory. (3rd edition). Prentice Hall.〕 It is frequently used with coherent modulations such as phase shift keying, mitigating the effects of multipath propagation and Doppler spreading. Many adaptation strategies exist. They include: *LMS Note that the receiver does not have access to the transmitted signal when it is not in training mode. If the probability that the equalizer makes a mistake is sufficiently small, the symbol decisions made by the equalizer may be substituted for .〔(Tutorial on the LMS algorithm )〕 *RLS A well-known example is the decision feedback equalizer,〔(Decision Feedback Equalizer )〕 a filter that uses feedback of detected symbols in addition to conventional equalization of future symbols.〔(【引用サイトリンク】 Equalization: The Correction and Analysis of Degraded Signals )〕 Some systems use predefined training sequences to provide reference points for the adaptation process. ==See also== * Equalizer * Intersymbol interference 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「adaptive equalizer」の詳細全文を読む スポンサード リンク
|