Multiplex communications – Channel assignment techniques – Combined time and frequency assignment
Patent
1995-11-14
1998-01-20
Chin, Wellington
Multiplex communications
Channel assignment techniques
Combined time and frequency assignment
370478, 370496, H04J 400
Patent
active
057107718
ABSTRACT:
A multichannel communication system has a transmitter for frequency-division-multiplexing and transmitting signals in a plurality of channels, and a receiver for selectively receiving the signal in one of the channels. The multichannel communication system prevents additional information from being interrupted in reception due to a channel change, for thereby reliably transmitting such additional information. The transmitter has a control information multiplexing unit for time-division-multiplexing main information in each of the channels with control information common to the channels at the same timing, and a transmitting unit for frequency-division-multiplexing and transmitting the main information in each of the channels which has been time-division-multiplexed with the control information by the control information multiplexing unit. The receiver has an inhibit signal generating unit for generating a channel change inhibit signal in timed relationship to the multiplexing of the control information, and an extracting unit extracting unit responsive to a channel change signal indicative of one of the channels to be received, for extracting the signal in the channel which is indicated by the channel change signal from frequency-division-multiplexed signals transmitted from the transmitting unit if a channel change inhibit signal is not transmitted from the inhibit signal generating means.
REFERENCES:
patent: 3872255 (1975-03-01), Nance et al.
patent: 5081704 (1992-01-01), Umeda et al.
Chin Wellington
Fujitsu Limited
Vu Huy D.
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