Radio communication apparatus
AssigneeUniden Corporation
InventorsKiyoshi Tanaka, Ping Huang
Life of this patent
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Abstract
A radio communication apparatus comprises a first/second modulator for modulating a first/second signal according to a first/second frequency, a first demodulator for detecting the received first modulation signal and regenerating the carrier, a clock regenerator for regenerating a clock from the detection output from the first demodulator, an amplitude sampler for sampling the amplitude of the received first modulation signal according to the regenerated clock, a second demodulator for controlling the frequency of the received second modulation signal and executing demodulation for the signal, and a gain controller for executing gain control for the output from the second demodulator according to the output from the amplitude sampler.
Claims16
A radio communication apparatus having a transmitting device and a receiving device, said transmitting device comprising:
- a first modulator for modulating a first signal according to a first frequency and outputting a first digital modulation signal;
- a second modulator for modulating a second signal according to a second frequency and outputting a second modulation signal;
- and
- a transmitter for transmitting said first modulation signal and said second modulation signal,
- said receiving device comprising:
- a receiver for receiving said first modulation signal and said second modulation signal;
- a first demodulator for detecting said received first digital modulation signal;
- a clock regenerator for regenerating a clock from a detection output from said first demodulator;
- an amplitude sampler for sampling the amplitude of said received first digital modulation signal at a timing of said regenerated clock;
- a second demodulator for controlling a frequency of said received second modulation signal and performing demodulation;
- and
- a gain controller for executing gain control of said second demodulator according to output from said amplitude sampler.
In a radio communication system having a transmitter for transmitting a first frequency signal modulated according to a first information signal and a second frequency signal modulated according to a second information signal, a receiver, comprising:
- a first demodulator responsive to said first frequency signal for regenerating a carrier signal and outputting a detection output.
- a first discriminator responsive to the detection output of said first demodulator for detecting said first information signal,
- a clock regenerator responsive to the detection output of said first demodulator for detecting a clock signal,
- a second demodulator responsive to said second frequency signal and said carrier signal for generating an intermediate signal representing said second information signal, and
- a second discriminator responsive to said first frequency signal, said intermediate signal and said clock signal for detecting said second information signal.
Method of radio communication using a combination of a first frequency signal modulated according to a first information signal and a second frequency signal modulated according to a second information signal, comprising the steps of:
- receiving said combination to detect said first frequency signal and said second frequency signal,
- demodulating said received first frequency signal to extract a carrier and to detect said first information signal,
- processing said received second frequency signal, together with said carrier, to generate an intermediate signal representing said second information signal, and
- processing said received first frequency signal, together with said intermediate signal, to detect said second information signal.
Dependencies are inferred from the claim text.