Tap selectable decision feedback equalizer

Details Tap selectable decision feedback equalizer Tap selectable decision feedback equalizer

1996-12-27

1999-08-31

Pham, Chi H.

Pulse or digital communications

Equalizers

Automatic

375348, 36472419, H03H 730, H03H 740, H03K 5159

Patent

active

059463511

ABSTRACT:
A decision feedback equalizer receiver that assigns a number F of feedforward filter taps and optimizes digital receiver performance in multipath channel environments, where F is an integer less than a memory length of a radio channel. The feedforward filter taps are assigned to delay times corresponding to an optimum burst timing parameter delay time, d(0), and to F-1 time delays based on "tap SNR indices." For an Uncorrelated Inter-Symbol-Interference (UISI) case, the F-1 time delays are the first F-1 rank ordered time delays are selected as the feedforward tap delay times. For a general case, a combination of the UISI case and an analytical two cluster case is obtained by selecting the first F-2 rank ordered time delays and a 2D time delay, where D is the delay time corresponding to the largest estimated tap SNR index.

REFERENCES:
patent: 5119196 (1992-06-01), Ayanoglu et al.
patent: 5245561 (1993-09-01), Sugiyama
patent: 5475710 (1995-12-01), Ishizu et al.
patent: 5483557 (1996-01-01), Webb
patent: 5513214 (1996-04-01), Gozzo
patent: 5777910 (1998-07-01), Lu

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