Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1987-08-25
1988-12-13
Pellinen, A. D.
Pulse or digital communications
Spread spectrum
Direct sequence
375116, 370107, 371 47, H04L 700
Patent
active
047916532
ABSTRACT:
A bit-error-rate tester provides for testing of links with different numbers of channels without replacing or reconfiguring an included pseudorandom word sequence (PRWS) generator. The tester includes a transmitter and a receiver, each with generators for parallel evenly staggered pseudorandom bit sequence (PRBS) replicas collectively constituting the PRWS. The receiver generator is a copy of the transmitter generator so that it can predict the PRWS received from the transmitter. Comparators are provided so that incoming and locally generating sequences can be compared to determine bit error rates. Synchronization of the receiver generator is effected using a pattern detector coupled to at least one reception line. When a predetermined pattern is detected, an injector injects registers of the receiver generator with a predetermined bit pattern. Afterwards, the receiver generator autonomously generates its PRWS synchronously with the PRWS received from the transmitting generator. A further embodiment provides for rerouting of crossed transmission channels as well as synchronization. In either case, there is no requirement that all available channels be active to effect synchronization.
REFERENCES:
patent: 4442527 (1984-04-01), Munday
patent: 4663766 (1987-05-01), Bremer
John J. O'Reilly, "The Radio and Electronic Engineer", vol. 45, No. 4, pp. 171-176, Apr. 1975.
I. Rampaigul and J. J. O'Reilly, "Series-Parallel Bit-Error-Ratio Measurement for High Digit Rate Transmission Systems", paper presented at an International Conference on Measurement for Telecommunication, 1985.
McFarland William J.
Walker Richard C.
Frazzini John A.
Hewlett--Packard Company
Jennings Derek S.
Pellinen A. D.
Wong Edward Y.
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