Pulse or digital communications – Repeaters – Testing
Patent
1992-04-10
1993-08-24
Swann, Tod R.
Pulse or digital communications
Repeaters
Testing
380 34, 455 331, 379 61, 379 63, H04K 100
Patent
active
052395570
ABSTRACT:
A cellular radio telephone system employs discontinuous transmission and reception of speech signals to conserve receiver processing resources. A frame structure is imposed on digitized speech data to divide the data into units of fixed transmission time. When no active speech is present for the entire duration of a frame, transmission of that frame of data is inhibited. At the receiver, decoding of received bits is performed to determine correlation with a defined set of code words. If no correlation is found after the first few received bits of a frame, due to the absence of active speech data, decoding is discontinued for the remainder of the frame's duration. This approach frees up the receiver's resources for other tasks, such as decoding of other received signals. Frames of data from different sources are transmitted with a defined time alignment to enable the receiver to remain synchronized in the absence of transmitted data. The frames associated with different sources are staggered relative to one another, to distribute processing loads at the receiver.
REFERENCES:
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patent: 4293953 (1981-10-01), Gutleber
patent: 4470138 (1984-09-01), Gutleber
T. Masamura, "Spread Spectrum Multiple Access System with Intrasystem Interference Cancellation", Transations Of The Institute Of Electronics And Communication Engineers Of Japan, Section E71, No. 3, Mar. 1, 1988, Tokyo, pp. 224-231.
Kohno et al., "Adaptive Cancellation of Interference in Direct-Sequence Spread-Spectrum Multiple Access Systems", Communications for the Information Age, IEEE Global Telecommunications Conference, vol. 1, Nov. 15, 1987, Tokyo, pp. 630-634.
M. K. Varanasi et al., "An Iterative Detector for Asynchronous Spread-Spectrum Multiple-Access Systems", IEEE Global Telecommunications Conference, vol. 1, Nov. 28, 1988, pp. 556-560.
Database Wpil, Week 9127, Derwent Publications Ltd., London, GB, An 91199981 & SU-A-1 605, 254, Nov. 1990.
Ericsson GE Mobile Communications
Swann Tod R.
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