Pulse or digital communications – Transceivers
Patent
1997-08-25
2000-03-07
Le, Amanda T.
Pulse or digital communications
Transceivers
375278, 375296, 375303, 375334, 455 83, 455 87, 455208, 455318, 332100, H04B 144
Patent
active
060349905
ABSTRACT:
A digital radio transmission and reception system capable of preventing shift of carrier by fading through receiving a modulated signal radio-transmitted, and then directly demodulating the signal. The digital radio transmission and reception system applying a direct modulation and demodulation method, including: a receiving part for selectively receiving a signal of a desired channel band, amplifying the received signal, mixing the selectively amplified signal with carrier frequency, subtracting a modulated signal in which eliminates the carrier frequency, and then comparing the signal with a reference level signal, thereby outputting demodulated digital; a transmitting part for power amplifying a demodulated transmitting signal, filtering spurious components and then outputting the filtered; a transmission and reception control switch for connecting the antenna to the transmitting part or the receiving part according to an input of a transmission and reception mode signal; a phase locked loop modulator for oscillating the carrier frequency corresponding to an oscillation control signal, outputting the oscillated carrier frequency, frequency shift keying modulating transmitting data as frequency of the carrier frequency band, thereby outputting the data; a second transmitting selection switch for switching an output of the phase locked loop modulator to the transmitting part or receiving part according to the transmitting mode control signal; and, a control part for detecting the amount of frequency offset of receiving data demodulated in the receiving part or monitoring a state of the carrier frequency oscillated from the phase locked loop modulator, thereby generating an oscillation control signal to constantly maintain the oscillated carrier frequency as well as a transmission and reception mode signal according to an operational state.
REFERENCES:
patent: 4570125 (1986-02-01), Gibson
patent: 5311556 (1994-05-01), Baker
patent: 5319799 (1994-06-01), Morita
patent: 5511236 (1996-04-01), Umstattd et al.
patent: 5550505 (1996-08-01), Gaus, Jr.
patent: 5862181 (1999-01-01), Ishizuka
Bushnell Esq. Robert E.
Le Amanda T.
Samsung Electronics Co,. Ltd.
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