Diversity communication method of time-division, time-compressed multiplexing telephone signal for mobile communication system
AssigneeIwatsu Electric Co., Ltd.
InventorSadao Itoh
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Abstract
In a mobile communication system in which signals are temporally compressed into time slots of a frame structure, a composite signal such as a telephone signal or data signal is hybrid-modulated using the same radio carrier wave, whereby diversity transmission/reception are available. The telephone signal is frequency-modulated using a single time slot of a single radio communication channel which has been allocated between a mobile transceiver and a radio base station. The frequency-modulated signal is again amplitude-modulated by the same telephone signal so that diversity transmission/reception is available.
Claims3
A method for providing diversity communication of a time-division, time-compressed multiplexing telephone signal for a mobile communication system having a plurality of radio base station means for covering a plurality of zones constituting service areas, and gateway switching means for switching communications between each of said plurality of radio base station means and each of a plurality of mobile radio means, wherein said plurality of mobile radio means use a radio channel through which signals segmented and temporally compressed into time slots of frame structures, are transmitted in order to thereby communicate with each of said plurality of radio base station means, and wherein said plurality of mobile radio means travel between said plurality of zones, said method comprising the steps of:
- performing amplitude modulation and angle modulation of a single carrier wave using said temporally compressed and segmented signals to thereby generate a hybrid-modulated signal which has been both amplitude-modulated and angle-modulated;
- transmitting said generated hybrid-modulated signal;
- and
- performing at least one of amplitude demodulation and angle demodulation on the hybrid-modulated signal.
Dependencies are inferred from the claim text.