Decision feedback equalizer and a method of operating a decision

Details Decision feedback equalizer and a method of operating a decision Decision feedback equalizer and a method of operating a decision

1989-01-04

1991-01-15

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

333 18, H03H 2100

Patent

active

049859021

ABSTRACT:
A decision feedback equalizer includes a transversal feedforward digital filter section (16) and a recursive feedback digital filter section (18) including a decision stage (20). In order to optimize the performance of the equalizer, the reference tap position is preferably aligned with a storage location of the feedforward filter section (16) containing the first sample of a current symbol and any contemporaneous samples of preceding symbols, the second and subsequent samples of the current symbol being contained in other storage locations of the feedforward filter section (16). In the case of data being in bursts a better performance may be obtained by time reversing the data applied to the feedforward filter section (16).

REFERENCES:
patent: 3879664 (1975-04-01), Monsen
patent: 3974449 (1976-08-01), Falconer
patent: 4271525 (1981-06-01), Watanabe
patent: 4847869 (1989-07-01), Labedz et al.
S. U. H. Qureshi, "Adjustment of the Position of the Reference Tap of an Adaptive Equalizer", IEEE Transactions on Communications, Sep. 1973, pp. 1046-1052.
D. D. Falconer et al. "Comparison of DFE and MLSE Performance of HF Channels", IEEE Global Communications Conference, Nov. 28-Dec. 1, 1983, Conf. Rec. vol. 1, pp. 1.3.1-1.3.6.
K. H. Mueller et al., "Timing Recovery in Digital Synchronous Data Receivers", IEEE Transactions on Communications, vol. COM-24, No. 5, May 1976, pp. 516-531.
H. Sari, "Baseband Equalizer Performance in the Presence of Selective Fading", IEEE Global Communications Conference, Nov. 28-Dec. 1, 1983, Conf. Rec. vol. 1, pp. 1.1.1-1.1.7.

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