Non-intrusive channel-impairment analyzer

Details Non-intrusive channel-impairment analyzer Non-intrusive channel-impairment analyzer

1990-04-02

1991-01-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 15, 375118, 333 18, H04B 346, H03H 730

Patent

active

049859005

ABSTRACT:
A non-intrusive channel-impairment analyzer is provided for measuring at least one quasi-static impairment characteristic of a band-limited data communications channel. The analyzer comprises a data receiver section and a measurement section. The data receiver section is arranged to receive data modulated onto quadrature phases of a carrier signal in two quadrature forward processing paths. The receiver section includes a data recovery circuit for effecting a decision as to the identity of the original data on the basis of the outputs from said processing paths, and decision-directed compensation means disposed in said paths and arranged to compensate for channel-impairment effects on the received signal. The measurement section is responsive to signals generated in the receiver section during the receipt of random data, to derive a measurement of at least one said channel impairment, such as phase or amplitude jitter.

REFERENCES:
patent: 3727134 (1973-04-01), Melvin
patent: 4273970 (1981-06-01), Favin et al.
patent: 4381546 (1983-04-01), Armstrong
patent: 4555790 (1985-11-01), Betts et al.
patent: 4575857 (1986-03-01), Murakami
patent: 4638495 (1987-01-01), Mizoguchi
patent: 4639939 (1987-01-01), Hirosaki et al.
Michael Y. Levy, Christian L. Poinas, "Adaptive Phase Correctors for Data Transmission Receivers", CIT-ALCATEL Dept. Transmission, France, IEEE Jul., 1979: pp. 45.5.1 through 45.5.5.

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