Mitsubishi Denki Kabushiki Kaisha

Hiroyuki Mizutani

Shuji Murakami

Kazuya Yamanaka

Hirohisa Machida

Hiroshi Ochi

An object is to obtain an adaptive equalizer device and an adaptive equalizer controlling method which provide an ideal output signal certainly and in a shorter time. The adaptive equalizer device includes an adaptive equalizer ( ) receiving a signal indicating a symbol, for filtering the signal indicating the symbol to adaptively remove intersymbol interference by selectively using one of a plurality of preset algorithms, and a rotation detecting circuit ( ) receiving an output signal (y(n)) from the adaptive equalizer, for detecting rotation of the symbol of the output signal (y(n)), wherein the adaptive equalizer ( ) selects one of the plurality of algorithms in accordance with detected result flags (&agr;, &bgr;) from the rotation detecting circuit ( ).

Adaptive equalizer device and method for controlling adaptive equalizer

Following arrangement of an adaptive equalizer with a direct filter structure according to the least mean square error architecture, look ahead conversion of modifying a tap coefficient of the next cycle utilizing the tap coefficient of a predetermined preceding cycle is carried out and then a retiming process of adjusting the timing of tap coefficients and signals is carried out to arrange delay elements, whereby a transposition filter is realized. A high-speed adaptive equalizer is provided that can have the critical path reduced without increasing the hardware amount and that is superior in expansionability.

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Hyogo, Japan

Hiroyuki Mizutani