Method of measuring the signature of digital transmission equipm

Details Method of measuring the signature of digital transmission equipm Method of measuring the signature of digital transmission equipm

1989-12-13

1991-06-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 51, 371 201, 36472401, 375 60, H04B 1700

Patent

active

050254537

ABSTRACT:
A method of measuring the signature of digital transmission equipment, in which the measurement can be performed during operation without adding special apparatus, and in which: the digital filtering on transmission is varied in order to simulate multiple paths; and the depth of fading is varied at each of a plurality of frequencies until a predetermined error rate is obtained. The invention also provides apparatus for implementing the method. The invention is particularly suitable for use with digital radio links.

REFERENCES:
patent: 3761825 (1973-09-01), Hill
patent: 4309771 (1982-01-01), Wilkens
patent: 4543066 (1985-09-01), French
patent: 4654851 (1987-03-01), Busby
patent: 4905172 (1990-02-01), Randle
International Conference of Measurements for Telecommunications Transmission Systems, MTTS'85, 1985, No. 286, pp. 108-111; G. D. Richman: "Automated signature measurement of operational microwave radio-relay equipment using a novel multipath simulator".
L'onde Electrique, vol. 66, No. 2, Mar. 1986, pp. 124-129, Paris, France; O. Toutan et al.: "Auto-adaptive dans les faisceaux hertziens numeriques".
Communication & Transmission, vol. 7, No. 1, Apr. 1985, pp. 5-30, Paris, France; J. M. Beddok et al.: "Transmissions a 140 Mbit/s par faisceaux hertziens a 6 et 11 GHz".

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