Decision feedback equalizer with a pattern detector

Details Decision feedback equalizer with a pattern detector Decision feedback equalizer with a pattern detector

1986-08-28

1988-03-08

Safourek, Benedict

Pulse or digital communications

Repeaters

Testing

375103, 455306, H04B 304

Patent

active

047303433

ABSTRACT:
An improved decision feedback equalizer, which removes intersymbol interference from pulse transmissions having a desired period, includes an arithmetic circuit (9) for extracting a residual intersymbol interference signal from a residual signal and a delayed residual signal which is produced by delaying the residual signal. The residual signal is produced by a subtractor circuit (2) which subtracts an estimated intersymbol interference signal from the pulse transmissions. A pattern detector circuit (11) is also provided to detect a particular consecutive pattern from a demodulated data sequence produced by a decision or detection circuit (3) for demodulating the residual signal. The residual intersymbol interference signal and a reference signal are inputted to a selector (10) responsive to the output of the pattern detector circuit. The output of the selector is sent to an adaptive filter circuit (50) which also receives the demodulated data sequence produced by the detection circuit and outputs the estimated intersymbol interference signal. The decision feedback equalizer can be modified to provide additional adaptive filter circuits for estimating intrasymbol interference, such that both intersymbol and intrasymbol interference signals can be removed from the pulse transmissions.

REFERENCES:
patent: 4441192 (1984-04-01), Kita et al.
patent: 4476491 (1984-10-01), Murata et al.
patent: 4528676 (1985-07-01), Mein et al.
"Some Considerations on the Design of Adaptive Digital Filters Equipped with the Sign Algorithym", IEEE Transactions on Communications, vol. COM-32, No. 3, Mar. 1984, pp. 258-266.
"A Study on the Subscriber Loop Transmission System for ISDN Based on the Echo Cancellation Technique", IEEE Intl Conf. on Comm., vol. SAC-2, No. 2, Mar. 1984, pp. 314-323.

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