Hybrid equalizer arrangement for use in data communications equi

Details Hybrid equalizer arrangement for use in data communications equi Hybrid equalizer arrangement for use in data communications equi

1994-10-13

1997-02-18

Marcelo, Melvin

Pulse or digital communications

Equalizers

375231, 375233, H04L 2701

Patent

active

056047690

ABSTRACT:
A hybrid type of decision feedback equalizer (DFE) structure that approaches optimal DFE performance is described. The hybrid DFE includes both an intersymbol interference DFE (ISI-DFE) and a noise predictive DFE (NP-DFE). In particular, an adaptive feedforward filter section is followed by both an intersymbol interference (ISI) predictive filter and a noise predictive (NP) filter. The corresponding transmitter uses a precoder that utilizes optimal coefficient values, denoted as C(z), of the hybrid DFE structure. In particular, C(z) is equal to (1+I(z)) (1+N(z))-1, where, the notation I(z) and N(z), as known in the art, represent the resulting coefficient values after adaptation of the ISI-DFE and the NP-DFE, respectively.

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IEEE, "Approximate maximum likelihood sequence estimators for time dispersive channels", N. A. Zervos, et al., 1983 International Electrical, Electronics Conference Proceedings, pp. 62-65, vol. 1; Publication Date: 1983.
ISCAS, "Design and Performance of an All-Digital Adaptive 2.048 MBIT/S Data Transmission System Using Noise Prediction", Graf et al., ISCAS 1989, pp. 1808-1812.

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