Pulse or digital communications – Repeaters – Testing
Patent
1987-08-31
1989-07-25
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375121, 34082562, H04l 516
Patent
active
048521221
ABSTRACT:
The modem of this invention overcomes problems associated with use in a wireless radio frequency communications channel. This modem provides a data carrier detection (DCD) function for associated data terminal equipment even though a transmission carrier or tone is not used. Provision is also made for communicating with data terminal equipment operating at a substantially lower data rate than the modem data rate without requiring a reduction in the modem data rate.
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Quresch et al. "A Custom VLSi Chip Set for Digital Signal Processing in High-Speed Voiceband Modems"]IEEE Journal on Selected Area in Communications, vol. SAC-4, No. 1, Jan. 1986.
C. Mills "A New Approach to Modem Design" Communication & Broadcast (GB) vol. 4, No. 2, (Spring, 1978).
Gilhousen "A Multi-Stack Microprocessor for Satellite Modems" NTC Telecommunication Conference, San Diego, Calif. 19174.
Harris Joseph L.
Nelson David P.
Polk, Jr. Charles E.
Chin Stephen
Safourek Benedict V.
Universal Data Systems, Inc.
Warren Charles L.
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