Dixon Robert C. (Palmer Lake CO) Vanderpool Jeffrey S. (Colorado Springs CO)
출원인 / 주소
Omnipoint Data Company, Inc. (Colorado Springs CO 02)
인용정보
피인용 횟수 :
212인용 특허 :
0
초록▼
A dual-mode transmitter having an antenna, a mode controller, a source encoder, a tunable-frequency synthesizer, a chip-code generator, a spread-spectrum modulator, a narrowband modualator, a power amplifier, and an adjustable bandpass filter. Also provided is a dual-mode receiver having a mode cont
A dual-mode transmitter having an antenna, a mode controller, a source encoder, a tunable-frequency synthesizer, a chip-code generator, a spread-spectrum modulator, a narrowband modualator, a power amplifier, and an adjustable bandpass filter. Also provided is a dual-mode receiver having a mode controller, a tunable-frequency synthesizer, a chip-code generator, an antenna, an adjustable bandpass filter, a preamplifier, a frequency converter, an IF amplifier, a spread-spectrum despreader, a spread-spectrum demodulator, a narrowband modulator, and a source decoder. For the transmitter and receiver, the mode controller selects receiving a narrowband modulation or a spread-spectrum modulation. The tunable-frequency synthesizer generates a local oscillator signal for the receiver, and a carrier signal for the transmitter. The chip-code generator generates a chip code signal for both the transmitter and the receiver. With a narrowband modulation setting of the mode controller, the transmitter and receiver have the adjustable bandpass filters adjusted to a narrowband width for telephone communications. With a spread-spectrum setting of the mode controller, the adjustable bandpass filters and the system are adjusted to transmit and receive a wide bandwidth for passing the spread-spectrum signal.
대표청구항▼
A dual-mode transmitter comprising: an antenna; a mode controller for selecting narrowband modulation and spread-spectrum modulation; information means for processing an information signal; a tunable-frequency synthesizer for generating a carrier signal; a chip-code generator for generating a chip-c
A dual-mode transmitter comprising: an antenna; a mode controller for selecting narrowband modulation and spread-spectrum modulation; information means for processing an information signal; a tunable-frequency synthesizer for generating a carrier signal; a chip-code generator for generating a chip-code signal; a spread-spectrum modulator coupled to said information means, said tunable-frequency synthesizer and said chip-code generator for spread-spectrum modulating the processed information signal with the chip-code signal and the carrier signal as a spread-spectrum signal; a narrowband modulator coupled to said information means and said tunable-frequency synthesizer for modulating the processed information signal with narrowband modulation as a narrowband modulated signal; a power amplifier coupled to said mode controller, said spread-spectrum modulator and said narrowband modulator, responsive to a narrowband modulation setting of said mode controller for amplifying the narrowband modulated signal, and responsive to a spread-spectrum setting of said mode controller for amplifying the spread-spectrum signal; an adjustable bandpass filter coupled to said antenna, said power amplifier and said mode controller, responsive to a narrowband modulation setting of said mode controller for adjusting a bandwidth of said adjustable bandpass filter to a narrow bandwidth for passing the narrowband modulated signal, and responsive to a spread-spectrum setting of said mode controller for adjusting the bandwidth of said adjustable bandpass filter to a wide bandwidth for passing the spread-spectrum signal.
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