Transmission circuit
First Claim
1. A transmission circuit, comprising:
- a baseband circuit for generating and outputting transmission data including first and second channel data;
a spreading unit for spreading the transmission data with a spreading code that differs for each transmission channel;
a multiplication unit for respectively weighting amplitudes of the first and second channel data by using a combination of two gain factors determined by a transmission data rate;
a digital modulation unit for digitally modulating the first and second channel data whose amplitudes are weighted by said multiplication unit; and
a quadrature modulator for quadrature-modulating the first and second channel data digitally modulated by said digital modulation unit and outputting the data as a transmission signal, wherein;
said multiplication unit weights the amplitudes of the first and second channel data by using gain factors that keep power of the transmission signal output from said quadrature modulator constant regardless of the transmission data rate without changing a ratio of a combination of gain factors determined by the transmission data rate, andsaid multiplication unit weights the amplitudes of the first and second channel data by using gain factors determined on the basis of the power of the transmission signal output from said quadrature modulator without changing the ratio of the combination of gain factors determined by the transmission data rate.
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Accused Products
Abstract
A transmission circuit includes a baseband circuit, spreading section, multiplier, digital modulator, quadrature modulator, and antenna. The baseband circuit generates and outputs at least one transmission data constituted by first and second channel data. The spreading section spreads the transmission data with a spreading code that differs for each transmission channel. The multiplier respectively weights the amplitudes of the first and second channel data by using a combination of two gain factors determined by a transmission data rate. The digital modulator digitally modulates the first and second channel data whose amplitudes are weighted by the multiplier. The quadrature modulator quadrature-modulates the digitally modulated first and second channel data and outputs the data as a transmission signal. The antenna emits the transmission signal output from the quadrature modulator as a radio wave. The multiplier weights the amplitudes of the first and second channel data by using gain factors that keep power of the transmission signal output from the quadrature modulator constant regardless of the transmission data rate without changing the ratio of a combination of gain factors determined by the transmission data rate.
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Citations
24 Claims
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1. A transmission circuit, comprising:
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a baseband circuit for generating and outputting transmission data including first and second channel data; a spreading unit for spreading the transmission data with a spreading code that differs for each transmission channel; a multiplication unit for respectively weighting amplitudes of the first and second channel data by using a combination of two gain factors determined by a transmission data rate; a digital modulation unit for digitally modulating the first and second channel data whose amplitudes are weighted by said multiplication unit; and a quadrature modulator for quadrature-modulating the first and second channel data digitally modulated by said digital modulation unit and outputting the data as a transmission signal, wherein; said multiplication unit weights the amplitudes of the first and second channel data by using gain factors that keep power of the transmission signal output from said quadrature modulator constant regardless of the transmission data rate without changing a ratio of a combination of gain factors determined by the transmission data rate, and said multiplication unit weights the amplitudes of the first and second channel data by using gain factors determined on the basis of the power of the transmission signal output from said quadrature modulator without changing the ratio of the combination of gain factors determined by the transmission data rate. - View Dependent Claims (2, 3, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 21, 23)
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6. A transmission circuit, comprising:
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a baseband circuit for generating and outputting transmission data including first and second channel data; a spreading unit for spreading the transmission data with a spreading code that differs for each transmission channel; a multiplication unit for respectively weighting amplitudes of the first and second channel data by using a combination of two gain factors determined by a transmission data rate; a digital modulation unit for digitally modulating the first and second channel data whose amplitudes are weighted by said multiplication unit; a quadrature modulator for quadrature-modulating the first and second channel data digitally modulated by said digital modulation unit and outputting the data as a transmission signal; and an antenna for emitting the transmission signal output from said quadrature modulator as a radio wave, wherein said transmission circuit further comprises; an amplification unit for amplifying the transmission signal output from said quadrature modulator with a gain based on a control voltage; a transmission level circuit for determining a transmission power value of the second channel data component; a first gain offset circuit for adding, to a transmission power value determined by said transmission level circuit, a first gain correction amount for controlling a gain of said amplification unit to keep transmission power of the second channel data component at the antenna end constant regardless of the transmission data rate by using a combination of two gain factors determined by the transmission data rate, and outputting the transmission power value; and a voltage generating circuit for generating a voltage for controlling the gain of said amplification unit, on the basis of the transmission power value output from said first gain offset circuit, and wherein said antenna emits the transmission signal output from said quadrature modulator and amplified by said amplification unit as a transmission signal. - View Dependent Claims (9, 12, 15, 18, 22, 24)
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Specification