Pulse or digital communications – Repeaters – Testing
Patent
1988-05-25
1990-09-11
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
375 13, 375121, H04B 138
Patent
active
049568515
ABSTRACT:
A modem which can automatically switch between protocols at different signalling rates. The protocal with non-standard signalling rates has a training sequence which initially has distinctive frequency-domain characteristics. Thus, as soon as one modem begins to send a training sequence, the other modem can distinguish which training sequence has been started. Thus, speed changes between protocols at different signalling rates can be remotely initiated.
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patent: 4734780 (1988-03-01), Iwata et al.
"Rapid Training of a Voiceband Data-Modem Receiver Employing an Equalizer with Fractional-T Spaced Coefficients," Chevillat et al., 35 IEEE Transactions on Communications, vol. COM-35, No. 9, (Sep. 1987).
"Passband Timing Recovery in an All-Digital Modem Receiver," Godard, IEEE Transactions on Communications, vol. COM-26, No. 5 (May 1978).
"Multidimensional Signal Constellations for Voiceband Data Transmission," Gersho et al., IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 5, (Sep. 1984).
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"Trellis-Coded Modulation with Multidimensional Constellations," Wei, IEEE Transactions on Information Theory, vol. IT-33, No. 4, (Jul. 1987).
Dunn William A.
Wolensky Joel A.
Case Communications Inc.
Chin Stephen
Olms Douglas W.
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