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US 6,205,131 B1Granted
Broadband implementation of supplemental code channel carrier phase offsets
AssigneesSony Corporation, Sony Electronics Inc.
InventorKraig L. Anderson
Life of this patent
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Abstract
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.
Claims17
A reverse traffic channel circuit for Code Division Multiple Access (CDMA) based mobile stations, comprising:
- a plurality of input terminal means for separately receiving a digital fundamental input signal A0 and a plurality of digital supplemental channel input signals A1 to A7;
- 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 Fi, and a fundamental quadrature channel signal Fq, and separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and supplemental quadrature channel signals S1q, S2q, . . . S7q;
- filtering means for separately filtering and scaling the fundamental in-phase channel signal Fi, the fundamental quadrature channel signal Fq, the separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and the separate supplemental quadrature channel signals S1q, S2q, . . . S7q;
- first combining means for combining the filtered fundamental in-phase channel signal Fi′, some of the separate filtered supplemental in-phase channel signals S1i′, S2i′, . . .S7i′, and some of the separate filtered supplemental quadrature channel signals S1q′, S2q′, S7q′ according to the following formula:
- [ F i ′ + S lq ′ + S 2 i ′ 2 + S 2 q ′ 2 - S 3 i ′ 2 + S 3 q ′ 2 + S 4 i ′ + S 5 q ′ + S 6 i ′ 2 + S 6 q ′ 2 - S 7 i ′ 2 + S 7 q ′ 2 ]
- to produce an overall in-phase digital output signal;
- second combining means for combining the filtered fundamental quadrature channel signal Fq′, some of the separate filtered supplemental in-phase channel signals S1i′, S2i′, . . . S7i′, and some of the separate filtered supplemental quadrature channel signals S1q′, S2q′, . . . S7q′ according to the following formula:
- [ F q ′ - S li ′ - S 2 i ′ 2 + S 2 q ′ 2 - S 3 i ′ 2 - S 3 q ′ 2 + S 4 q ′ - S 5 i ′ - S 6 i ′ 2 + S 6 q ′ 2 - S 7 i ′ 2 - S 7 q ′ 2 ]
- to 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;
- and
- quadrature modulating means for quadrature modulating the overall in-phase analog output signal with a carrier termcos(2πƒct) to produce a first quadrature modulated result signal, quadrature modulating the overall quadrature analog output signal with a carrier term sin(2πƒct) to produce a second quadrature modulated result signal, where fc 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).
9 more elements
A reverse traffic channel method for Code Division Multiple Access (CDMA) based mobile stations, comprising the steps of
- separately receiving a digital fundamental input signal A0 and a plurality of digital supplemental channel input signals A1 to A7;
- quadrature spreading the fundamental channel input signal and each supplemental channel input signal to produce, respectively, a fundamental in-phase channel signal Fi, and a fundamental quadrature channel signal Fq, and separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and supplemental quadrature channel signals S1q, S2q, . . . S7q;
- separately filtering and scaling the fundamental in-phase channel signal Fi, the fundamental quadrature channel signal Fq, the separate supplemental in-phase channel signals S1i;
- S2i, . . . S7i, and the separate supplemental quadrature channel signals S1q, S2q, . . . S7q;
- combining the filtered fundamental in-phase channel signal Fi′, some of the separate filtered supplemental in-phase channel signals S1i′, S2i′, . . . S7i′, and some of the separate filtered supplemental quadrature channel signals S1q′, S2q′, . . . S7q′ according to the following formula:
- [ F i ′ + S lq ′ + S 2 i ′ 2 + S 2 q ′ 2 - S 3 i ′ 2 + S 3 q ′ 2 + S 4 i ′ + S 5 q ′ + S 6 i ′ 2 + S 6 q ′ 2 - S 7 i ′ 2 + S 7 q ′ 2 ]
- to produce an overall in-phase digital output signal;
- combining the fundamental filtered quadrature channel signal Fq′, and some of the separate filtered supplemental in-phase channel signals S1i′, S2i′, . . . S7i′, and the separate filtered supplemental quadrature channel signals S1q′, S2q′, . . . S7q′ according to the following formula:
- [ F q ′ - S li ′ - S 2 i ′ 2 + S 2 q ′ 2 - S 3 i ′ 2 - S 3 q ′ 2 + S 4 q ′ - S 5 i ′ - S 6 i ′ 2 + S 6 q ′ 2 - S 7 i ′ 2 - S 7 q ′ 2 ]
- to produce an overall quadrature digital output signal;
- 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;
- and
- quadrature modulating the overall in-phase analog output signal with a phase-offset carrier term cos(2πƒct) to produce a first quadrature modulated result signal, quadrature modulating the overall quadrature analog output signal with a phase-offset carrier term sin(2πƒct) to produce a second quadrature modulated result signal, where fc 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).
10 more elements
A reverse traffic channel circuit for Code Division Multiple Access (CDMA) based mobile stations, comprising:
- a plurality of input terminal means for separately receiving a digital fundamental input signal A0 and a plurality of digital supplemental channel input signals A1 to A7;
- 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 Fi, and a fundamental quadrature channel signal Fq, and separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and supplemental quadrature channel signals S1q, S2q, . . . S7q;
- first combining means for combining the fundamental in-phase channel signal Fi, the fundamental quadrature channel signal Fq, the separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and the separate supplemental quadrature channel signals S1q, S2q. . . S7q according to the following groupings:
- ( F i + S 4 i ) ;
- ( S 2 i 2 - S 3 i 2 + S 6 i 2 - S 7 i 2 ) ;
- ( S 1 q + S 5 q ) ;
- ( S 2 q 2 + S 3 q 2 + S 6 q 2 + S 7 q 2 ) , ( a )
- second combining means for combining the fundamental in-phase channel signal Fi, the fundamental quadrature channel signal Fq, the separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and the separate supplemental quadrature channel signals S1q, S2q, . . . S7q according to the following groupings:
- ( F q + S 4 q ) ;
- ( - S 2 i 2 - S 3 i 2 - S 6 i 2 - S 7 i 2 ) ;
- ( - S 1 i - S 5 i ) ;
- ( S 2 q 2 - S 3 q 2 + S 6 q 2 + S 7 q 2 ) , ( b )
- filtering means for separately filtering and scaling each of the signals of the groupings (a) and (b) above;
- third combining means for combining the filtered signal groupings of group (a) to produce an overall in-phase digital output signal;
- fourth combining means for combining the filtered signal groupings of group (b) to 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;
- and
- quadrature modulating means for quadrature modulating the overall in-phase analog output signal with a phase-offset carrier term cos(2πƒct) to produce a first quadrature modulated result signal, quadrature modulating the overall quadrature analog output signal with a phase-offset carrier term sin(2πƒct) to produce a second quadrature modulated result signal, where fc 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).
15 more elements
A reverse traffic channel method for Code Division Multiple Access (CDMA) based mobile stations, comprising the steps of:
- separately receiving a digital fundamental input signal A0 and a plurality of digital supplemental channel input signals A1 to A7;
- quadrature spreading the fundamental channel input signal and each quadrature channel input signal to produce, respectively, the fundamental in-phase channel signal Fi, and a fundamental quadrature channel signal Fq, and separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and supplemental quadrature channel signals S1q, S2q, . . . S7q;
- combining the fundamental in-phase channel signal Fi, some of the separate supplemental in-phase channel signals S1i, S2i, . . . S7i, and some of the separate supplemental quadrature channel signals S1q, S2q, . . . S7q according to the following groupings:
- ( F i + S 4 i ) ;
- ( S 2 i 2 - S 3 i 2 + S 6 i 2 - S 7 i 2 ) ;
- ( S 1 q + S 5 q ) ;
- ( S 2 q 2 + S 3 q 2 + S 6 q 2 + S 7 q 2 ) , ( a )
- combining the fundamental quadrature channel signal Fq, some of the separate supplemental in-phase channel signals S1i, S2, . . . S7i, and some of the separate supplemental quadrature channel signals S1q, S2q, . . . S7q according to the following groupings:
- ( F q + S 4 q ) ;
- ( - S 2 i 2 - S 3 i 2 - S 6 i 2 - S 7 i 2 ) ;
- ( - S 1 i - S 5 i ) ;
- ( S 2 q 2 - S 3 q 2 + S 6 q 2 + S 7 q 2 ) , ( b )
- separately filtering and scaling each of the signals of the groupings (a) and (b) above;
- combining the filtered signal groupings of group (a) to produce an overall in-phase digital output signal;
- combining the filtered signal groupings of group (b) to produce an overall quadrature digital output signal;
- 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;
- and
- quadrature modulating the overall in-phase analog output signal with a phase-offset carrier term cos(2πƒct) to produce a first quadrature modulated result signal, quadrature modulating the overall quadrature analog output signal with a phase-offset carrier term sin(2πƒct) to produce a second quadrature modulated result signal, where fc 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).
15 more elements
Dependencies are inferred from the claim text.