[특허]Spread spectrum multipath receiver apparatus and method

Spread spectrum multipath receiver apparatus and method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04K-001/00
출원번호	US-0614827 (1990-11-16)
발명자 / 주소	Schilling Donald L. (Sands Point NY)
출원인 / 주소	SCS Mobilecom, Inc. (Port Washington NY 02)
인용정보	피인용 횟수 : 71 인용 특허 : 0

초록 ▼

An apparatus for adapting to receive a particular path, having the greatest amplitude, of a spread-spectrum signal with multipath. The spread-spectrum signal is modulated by a chip-code. A chip-code generator generates a chip-code signal having the same chip-code as the spread-spectrum signal. A plurality of shift registers shift the chip-code signal by a plurality of time delays. First and second ring counters generate first and second sequencing signals for controlling first and second switching devices. The first switching device successively switches between a plurality of taps of the shift registers in a direction of increasing or decreasing delays for generating the chip-code signal with the first time delay. The second switching device successively switches between the plurality of taps of the shift registers in a direction of increasing or decreasing delays for generating the chip-code signal with a second time delay. A first correlator correlates the spread-spectrum signal received at the input with the chip-code signal with the first time delay. A second correlator correlates the spread-spectrum signal received at the input with the chip-code signal with the second time delay. A comparator generates first and second comparator signals by comparing the outputs of the first correlator and the second correlator.

대표청구항 ▼

An apparatus having an input, for adapting to receive a particular path, having the greatest amplitude, of a spread-spectrum signal with multipath, said spread-spectrum signal modulated by a chip-code signal, comprising: a chip-code generator for generating the chip-code signal having the same chip code as the spread-spectrum signal; a plurality of shift registers operatively coupled to said chip-code generator for shifting said chip-code signal by a plurality of time delays, each time delay having a duration equal to a time period of one chip of said chip-code signal, said plurality of shift registers having a plurality of taps corresponding to each of said time delays; a first ring counter responsive to a second comparator signal for generating a first sequencing signal; a first switching device operatively coupled to said first ring counter and to the plurality of taps of said plurality of shift registers, said first switching device responsive to said first sequencing signal for successively switching between said plurality of taps for changing a delay of the chip-code signal with a first time delay; a second ring counter responsive to a first comparator signal for generating a second sequencing signal; a second switching device operatively coupled to said second ring counter and to the plurality of taps of said plurality of shift registers, said second switching device responsive to said second sequencing signal for successively switching between said plurality of taps for changing a delay of the chip-code signal with a second time delay; a first correlator operatively coupled to said input and to said first switching device for generating a first correlation signal by correlating said spread-spectrum signal received at said input with said chip-code signal having the first time delay; a second correlator operatively coupled to said input and to said second switching device for generating a second correlation signal by correlating said spread-spectrum signal received at said input with said chip-code signal having the second time delay; a difference amplifier for subtracting the second correlation signal from the first correlation signal; a first comparator operatively coupled to said difference amplifier for generating the first comparator signal when said difference signal is greater than a first threshold; and a second comparator operatively coupled to said difference amplifier for generating the second comparator signal when said difference signal is less than a second threshold.

이 특허를 인용한 특허 (71)

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Lomp, Gary R, Setting a transmission power level for a mobile unit.
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Lomp, Gary R., Spread spectrum adaptive power control.
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Lomp Gary R., Spread spectrum adaptive power control system and method.
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Lomp, Gary R., Spread spectrum adaptive power control using a base station.
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Lomp Gary R., Spread spectrum multipath processor system and method.
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Lomp Gary R., Variable bandwidth spread spectrum device.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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