Pulse or digital communications – Repeaters – Testing
Patent
1980-06-27
1982-12-21
Swann, III, Glen R.
Pulse or digital communications
Repeaters
Testing
375 34, H03H 1700
Patent
active
043653383
ABSTRACT:
In a communication system for transmitting information over a dispersive link, a transmitted message is assembled to contain alternately arranged known and unknown pluralities of data symbols. At the transmitter, the known data symbols may be produced by a maximal length PN sequence generator, with an identical generator being provided at the receiver for reproducing the known symbol sequences to enable data recovery to be achieved. In the received signal processing equipment, the received message is subjected to a prescribed data recovery algorithm containing a transversal filter function and a data estimate refinement scheme which takes advantage of the a priori knowledge of data symbols of those portions of the transmitted message between which unknown data symbols are located. A transmitted message contains a plurality of successive frame, each frame containing N known data symbols followed by M unknown data symbols. Thus preceding and succeeding each set of M unknown data symbols there are respective sets of N known data symbols that enable the characteristics of the transversal filter function, and thereby the data estimates of the unknown symbols, to be updated and adaptively refined. Synchronization of the local PN sequence generator at the receiver with the PN sequence of which the successive sets of N known data symbols are composed in the transmitted message is achieved through a prescribed tone sequence/initialization scheme, subsequent to which unknown data is transmitted and processed at the receiver in accordance with the data recovery algorithm.
REFERENCES:
patent: 4027258 (1977-05-01), Perreault
patent: 4038536 (1977-07-01), Feintuch
patent: 4058713 (1977-11-01), Di Toro
Clark George C.
McRae Daniel D.
Szuchy Nicholas C.
Harris Corporation
Swann III Glen R.
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