Apparatus and method for adjusting the receivers of data transmi

Pulse or digital communications – Repeaters – Testing

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364724, H03H 730, H03K 5159

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active

047019360

ABSTRACT:
Filters are provided at the outputs of data transmission links to overcome attenuation distortion and phase distortion but such filters tend to increase the noise content of received signals. In the present invention a filter coupled to a linear baseband channel is constrained to be an all pass network, thus avoiding any noise enhancement at its output. The filter is adjusted using a channel estimator and an adjustment system to give the channel plus the filter an impulse-response that rises rapidly to its peak, thus simplifying the detection process needed for a satisfactory tolerance to noise. The required response is obtained by finding those roots (zeros) of the z transform of the sampled impulse-response of the channel, which have a modulus greater than some given value which is not less than unity, and adjusting the filter such that, in the z transform of the sampled impulse-response of the channel and filter, the roots are replaced by the complex conjugates of their reciprocals, the remaining roots of the channel z-transform being left unchanged.

REFERENCES:
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patent: 4356558 (1982-10-01), Owen et al.
patent: 4489391 (1984-12-01), Morikawa
Rabinev et al "Theory and Application of Digital Signal Processing" Prentical Hall 1975 pp. 84-87.
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The Radio and Electronic Engineer, vol. 51, "Detection Processes for a 9600 bit/s Modem", A. P. Clark et al, pp. 455-465, 1981.
IEEE Transactions on Information Theory, "Adaptive Maximum-Likelihood Sequence Estimation for Digital Signaling in the Presence of Intersymbol Interference", F. R. Magee, Jr. et al, Jan. 1973, pp. 120-124.
Signal Processing 2, "Estimation of the Sampled Impulse-Response of a Channel", A. P. Clark et al, pp. 39-53, 1980.
IEE Proc., vol. 128, Pt. F., No. 1, "Channel Estimation for an HF Radio Link, A. P. Clark et al, Feb. 1981, pp. 33-42.
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