Data transmission system with reduced error propagation

Pulse or digital communications – Spread spectrum – Direct sequence

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375 14, 375 99, 3647242, H03D 106, H03D 1104, H03K 501, H03K 604, H04B 110, H04L 100, H04L 2508

Patent

active

053533100

ABSTRACT:
For avoiding error propagation as a result of decision feedback equalization, the data to be transmitted are coded with a coder 2 which has a transfer function substantially inverse to the transfer function of the channel 4. Consequently, instantaneous decisions about the received symbol may be made at the receiver 6 without intersymbol interference causing a disturbance. If the channel transfer function differs from the transfer function of the precoder 2, intersymbol interference will again occur, so that the symbol error rate will increase. In order to restrict this increase of the symbol error rate as much as possible, the receiver comprises a cascaded circuit of an adaptive filter 18 which has an inverse transfer function to that of the channel and a decoder 21 which has an inverse transfer function to that of the precoder 2.

REFERENCES:
patent: 4870657 (1989-09-01), Bergmans et al.
patent: 4905254 (1990-02-01), Bergmans
patent: 4953183 (1990-08-01), Bergmans et al.
Bergmans et al., "Partial-Response Decoding of Rate 1/2 Modulation Code for Digital Storage," IEEE. Trans. on Communications, vol. 39, No. 11 Nov. 1991 pp. 1569-1581.
Forney et al., "Combined Equalization and Coding Using Precoding", IEEE Communications Magazine (Dec. 1991) pp. 25-34.
Holte et al., "A New Digital Echo Canceler for Two-Wire Subscriber Lines", IEEE Trans. Com., vol. COM-29, No. 11, Nov. 1981 pp. 1573-1580.
Messerschmitt, "Generalized Partial Response for Equalized Channels with Rational Spectra", IEEE Trans. Comm., vol. Comm.-23, No. 11, Nov. 1975 pp. 1251-1258.
Kobayashi, "On Decoding of Correlative Level Coding Systems with Ambiguity Zone Detection", IEEE Trans. Comm., vol. Com-19, No. 4, Aug. 1971.

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