[특허]Multiformat auto-handoff communications handset

Multiformat auto-handoff communications handset 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/38
출원번호	US-0556863 (1995-11-02)
발명자 / 주소	Andrews Scott (Long Beach CA)
출원인 / 주소	TRW Inc. (Redondo Beach CA 02)
인용정보	피인용 횟수 : 76 인용 특허 : 0

초록 ▼

Disclosed is an apparatus and method for supporting communications and handoffs between multiple signal formats at multiple carrier frequencies. Antenna circuitry which includes a linearly polarized antenna and a circularly polarized antenna is utilized to receive and transmit the multiple signal formats at the multiple carrier frequencies simultaneously. A pair of RF signal paths each including RF transmit circuitry, RF receive circuitry and RF processing capabilities are utilized to support simultaneous communications between two signal formats. A multisystem controller in communications with each RF signal path initiates and completes handoffs between the multiple signal formats utilizing both RF signal paths to achieve uninterrupted communications across a large service coverage area.

대표청구항 ▼

A multiformat auto-handoff communications handset to support communications and handoffs between multiple signal formats at multiple carrier frequencies, said multiformat auto-handoff communications handset comprising: antenna means for receiving and transmitting the multiple signal formats at the multiple carrier frequencies, said antenna means for simultaneously receiving a first RF receive signal and a second RF receive signal and for simultaneously transmitting a first RF transmit signal and a second RF transmit signal; first broadband RF receive means for down converting the first RF receive signal into a first IF receive signal, said first broadband RF receive means including a first quadrature LO generator operable to produce a first pair of quadrature signals substantially 90°out of phase of each other over a frequency range of between about 800 MHz to 2.4 GHz, first broadband RF transmit means for up converting a first IF transmit signal into the first RF transmit signal, and first IF processor means for demodulating multiple signal formats of the first IF receive signal and for modulating multiple signal formats of the first IF transmit signal; second broadband RF receive means for down converting the second RF receive signal into a second IF receive signal, said second broadband RF receive means including a second quadrature LO generator operable to produce a second pair of quadrature signals substantially 90°out of phase of each other over a frequency range of between about 800 MHz to 2.4 GHz, second broadband RF transmit means for up converting a second IF transmit signal into the second RF transmit signal, and second IF processor means for demodulating multiple signal formats of the second IF receive signal and for modulating multiple signal formats of the second IF transmit signal; and multisystem controller means for initiating and completing handoffs between the multiple signal formats at the multiple carrier frequencies.

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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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메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

Multiformat auto-handoff communications handset 원문보기

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Multiformat auto-handoff communications handset 원문보기

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연구과제 타임라인

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