Demodulation and modulation circuit and demodulation and modulation method
First Claim
1. A demodulation circuit for demodulating a digital transmission signal, wherein a preliminarily known signal being inserted in said digital transmission signal upon transmission, said demodulation circuit comprising:
- A/D converting means for performing A/D conversion of a base band signal obtained by demodulation of said digital transmission signal; and
phase shifting means for causing phase shift of one of said digital transmission signal and said base band signal on the basis of said known signal after digital conversion by said A/D converting means and said known signal upon transmission.
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Abstract
A demodulation circuit and a demodulation method can optimize sampling timing with achieving reduction of power consumption. A preliminarily known signal is inserted in the digital transmission signal upon transmission. The demodulation circuit includes A/D converting means for performing A/D conversion of a base band signal obtained by demodulation of the digital transmission signal, and phase shifting means for causing phase shift of one of the digital transmission signal and the base band signal on the basis of the known signal after digital conversion by the A/D converting means and the known signal upon transmission.
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Citations
28 Claims
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1. A demodulation circuit for demodulating a digital transmission signal, wherein
a preliminarily known signal being inserted in said digital transmission signal upon transmission, said demodulation circuit comprising: -
A/D converting means for performing A/D conversion of a base band signal obtained by demodulation of said digital transmission signal; and
phase shifting means for causing phase shift of one of said digital transmission signal and said base band signal on the basis of said known signal after digital conversion by said A/D converting means and said known signal upon transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A modulation circuit for modulating a digital signal comprising:
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known signal inserting means for inserting a preliminarily known signal to said digital signal; and
modulating means for modulating the digital signal after insertion of said known signal. - View Dependent Claims (12, 13, 14)
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15. A demodulation method for demodulating a digital transmission signal, wherein
a preliminarily known signal being inserted in said digital transmission signal upon transmission, said demodulation method comprising: -
first step of performing A/D conversion of a base band signal obtained by demodulation of said digital transmission signal; and
second step causing phase shift of one of said digital transmission signal and said base band signal on the basis of said known signal after digital conversion in said first step and said known signal upon transmission. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A modulation circuit for modulating a digital signal comprising:
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fifth step of inserting a preliminarily known signal to said digital signal; and
sixth step of modulating the digital signal after insertion of said known signal. - View Dependent Claims (26, 27, 28)
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Specification