Pulse or digital communications – Repeaters – Testing
Patent
1990-01-19
1991-04-02
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
3647242, 375 16, H04L 2701
Patent
active
050051857
ABSTRACT:
In a parallel-mode adaptive transversal equalizer, P- and Q-channel data streams from A/D converters (1, 5) are respectively passed through the tapped-delay lines of trasversal filters (2, 6), on the one hand, and are one-symbol delayed, on the other, by delay circuits (3, 7, 66, 67) to produce (N-1) successively delayed P- and Q-channel data streams, which are respectively passed through the tapped delay lines of transversal filters (4; 63, 8; 64). In each trasversal filter, symbols appearing at successive taps of the tapped-delay line are sampled and held for a duration of N symbols to produce first and second groups of stored symbols, the stored symbols of the first group being multiplied by first tap weights and summed, producing N first equalized outputs for each channel. The stored symbols of the second are multiplied by second tap weights and summed, producing N second equalized outputs for each channel. The first equalized outputs of each channel are respectively combined by adders (10-14, 68, 69) with the second equalized outputs of the otehr channel and multiplexed (14, 15) into P- and Q-channel outputs. Correlations are detected by correlators (16-19, 70, 72) between data and error components of each of the P- and Q-channel outputs to control the first variable tap weights of associated tapped-delay lines, and correlations are detected by correlators (20-23, 71, 73) between data components of one of the P- and Q-channel outputs and error components of the other channel output to control the second variable tap weights of associated tapped-delay lines.
REFERENCES:
patent: 4594725 (1986-06-01), Desperben et al.
patent: 4635276 (1987-01-01), Karabinis
patent: 4716577 (1987-12-01), Oexmann
patent: 4829543 (1989-05-01), Borth et al.
Matsuura Hideki
Mizoguchi Shoichi
NEC Corporation
Safourek Benedict V.
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