Wideband digital equalizers for subscriber loops

Details Wideband digital equalizers for subscriber loops Wideband digital equalizers for subscriber loops

H - Electricity

04

L

340/73

H04L 1/00 (2006.01) H03H 17/00 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2023178

A digital decision feedback equalizer is disclosed in which compensation for the post-cursors of the impulse response of the transmission channel is divided up into two regions. A first region encompasses the initial rapidly changing unpredictable transient response, possibly oscillatory, of the transmission channel. A fast acting, close-tracking linear filter is used to compensate for this largely unpredictable initial transient. The second region of the impulse response is the slowly changing, easily predictable asymptotic tail of the impulse response. This second region can be compensated for by a relatively slowacting, simple pole-zero filter. Together, the two equalizer sections provide anoverall equalizer design far less complicated and less expensive than an equalizer based on a single linear compensating filter. A finite impulse response (FIR) filter is used to compensate for the unpredictable, rapidly changing initial transient portion of the impulse response, while an infinite impulse response (IIR) filter is used to compensate for the slower acting tail portion of the impulse response.

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