Intelligent timing recovery for a broadband adaptive equalizer

Details Intelligent timing recovery for a broadband adaptive equalizer Intelligent timing recovery for a broadband adaptive equalizer

1996-03-20

1998-09-15

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Angle modulation

375355, H04L 2722, H04L 700

Patent

active

058090860

ABSTRACT:
A timing recovery process for digital receivers employing decision-feedback equalization (DFE) or delayed decision-feedback sequence estimation (DDFSE) can be executed prior to equalization, minimizes training complexity, and provides fast equalizer start-up for transmissions of short packets. The optimum symbol timing and burst timing is determined by (i) calculating a signal-to-intersymbol interference-plus-noise ratio (SINR) index by estimating the channel impulse response and the noise power, and (ii) varying the symbol timing and the burst timing to maximize the calculated SINR index. The timing recovery process particularly improves performance of a digital receiver utilizing (a) decision-feedback equalizer structures in which the delay spread is large compared to the span of the feedforward filter, and (b) equalizer structures based on delayed decision-feedback sequence estimation in which the delay spread is large compared to the memory of the Viterbi sequence estimator section.

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