Broadband implementation of supplemental code channel carrier phase offsets
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-007/216
H04B-015/00
출원번호
US-0992368
(1997-12-16)
발명자
/ 주소
Anderson Kraig L.
출원인 / 주소
Sony Electronics Inc.
대리인 / 주소
Shaw, Jr.
인용정보
피인용 횟수 :
0인용 특허 :
11
초록▼
Reverse channel circuitry for CDMA based mobile stations which allows carrier phase offsets to be implemented at baseband, thereby eliminating the need for multiple quadrature modulators and excessive D/A converters. In addition, just four baseband filters, two using scaled coefficients and the othe
Reverse channel circuitry for CDMA based mobile stations which allows carrier phase offsets to be implemented at baseband, thereby eliminating the need for multiple quadrature modulators and excessive D/A converters. In addition, just four baseband filters, two using scaled coefficients and the other two unscaled coefficients, are time multiplexed to produce in-phase and quadrature terms. The invention can lead to a significant savings in hardware and be a valuable tool in implementing multiple code channels with different carrier phase offsets.
대표청구항▼
[What is claimed is:] [1.]a plurality of input terminal means for separately receiving a digital fundamental input signal A.sub.0 and a plurality of digital supplemental channel input signals A.sub.1 to A.sub.7 ;quadrature spreading means for quadrature spreading the fundamental channel input signal
[What is claimed is:] [1.]a plurality of input terminal means for separately receiving a digital fundamental input signal A.sub.0 and a plurality of digital supplemental channel input signals A.sub.1 to A.sub.7 ;quadrature spreading means for quadrature spreading the fundamental channel input signal and each supplemental channel input signal to produce, respectively, a fundamental in-phase channel signal F.sub.i, and a fundamental quadrature channel signal F.sub.q, and separate supplemental in-phase channel signals S.sub.1i, S.sub.2i, . . . S.sub.7i, and supplemental quadrature channel signals S.sub.1q, S.sub.2q, . . . S.sub.7q ;filtering means for separately filtering and scaling the fundamental in-phase channel signal F.sub.i, the fundamental quadrature channel signal F.sub.q, the separate supplemental in-phase channel signals S.sub.1i, S.sub.2i, . . . S.sub.7i, and the separate supplemental quadrature channel signals S.sub.1q, S.sub.2q, . . . S.sub.7q ;first combining means for combining the filtered fundamental in-phase channel signal F.sub.i ', some of the separate filtered supplemental in-phase channel signals S.sub.1i ', S.sub.2i ', . . .S.sub.7i ', and some of the separate filtered supplemental quadrature channel signals S.sub.1q ', S.sub.2q ', S.sub.7q ' according to the following formula: produce an overall in-phase digital output signal;second combining means for combining the filtered fundamental quadrature channel signal F.sub.q ', some of the separate filtered supplemental in-phase channel signals S.sub.1i ', S.sub.2i ', . . . S.sub.7i ', and some of the separate filtered supplemental quadrature channel signals S.sub.1q ', S.sub.2q ', . . . S.sub.7q ' according to the following formula: produce an overall quadrature digital output signal;digital to analog means for converting each of the overall in-phase digital output signal and the overall quadrature digital output signal into a corresponding overall in-phase analog output signal and a corresponding overall analog quadrature output signal, respectively; andquadrature modulating means for quadrature modulating the overall in-phase analog output signal with a carrier termcos(2.pi..function..sub.c t) to produce a first quadrature modulated result signal, quadrature modulating the overall quadrature analog output signal with a carrier term sin(2.pi..function..sub.c t) to produce a second quadrature modulated result signal, where f.sub.c is the carrier frequency and t is time, and combining the first quadrature modulated result signal with the second quadrature modulated result signal to produce a radio frequency output signal S(t).
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