Decision feedback equalizer

Details Decision feedback equalizer Decision feedback equalizer

H - Electricity

04

L

H04L 27/01 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2055847

A decision feedback equalizer for equalizing a received analog baseband signal (1) has a gain control circuit (11) which compresses the amplitude of the baseband signal (1) to 1/K (K ? 1). The compressed signal is converted to a digital signal by an analog-to-digital converter (12). A decision feedback equalizer section (101) has a feedforward equalizer (201) to which the digital signal is applied, a feedback equalizer (202), and an adder (13) for adding the outputs of the feedforward and feedback equalizers. A postprocessor (15) discriminates the adder output (S1') which has been multiplied by K to thereby output a received data signal (d) and a discrimination error signal (e). An expansive decision circuit (104) expands the adder output by L times (L > 1), discriminates the expanded signal, and delivers the result of discrimination to the feedback equalizer (202). A control signal generator (102) feeds tap coefficients to the feedforward and feedback equalizers.

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