Radio transmitter and method of controlling transmission by radio transmitter
First Claim
1. A radio transmitter comprising:
- a transmission power control means for controlling a gain thereof according to a control signal applied thereto and for amplifying a radio frequency (RF) signal input thereto to generate an RF output signal having a predetermined power;
a power monitoring means for monitoring the RF output signal so as to obtain an average power level of the RF output signal;
an error calculating means for calculating an error level from the difference between the average power level and a reference power level which corresponds to the predetermined power; and
a control signal generating means for multiplying the error level by a correction coefficient so as to obtain a control signal correction value for correcting the value of the control signal, and adjusting the value of the control signal to be delivered to said transmission power control means on the basis of the control signal correction value and a reference control value that is predetermined so as to generate an RF output signal having the predetermined power.
1 Assignment
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Accused Products
Abstract
APC circuitry used for a radio transmitter comprises a detector (7) which detects a radio frequency (RF) output signal (5) to output a detection signal (8), an integrator (15) which integrates the detection signal (8) to output a power signal (16) representing the average power level of the RF output signal (5), a control unit (18) for calculating an error level from the difference between the average power level and a reference power level which corresponds to a predetermined power of the RF output signal (5), and for multiplying the error level by a correction coefficient so as to calculate a control signal correction value for correcting the value of a control signal (14) and then generate control data the digital value of which is corrected according to the control signal correction value and a reference control value that is predetermined so as to generate the RF output signal (5) having the predetermined power.
298 Citations
15 Claims
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1. A radio transmitter comprising:
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a transmission power control means for controlling a gain thereof according to a control signal applied thereto and for amplifying a radio frequency (RF) signal input thereto to generate an RF output signal having a predetermined power; a power monitoring means for monitoring the RF output signal so as to obtain an average power level of the RF output signal; an error calculating means for calculating an error level from the difference between the average power level and a reference power level which corresponds to the predetermined power; and a control signal generating means for multiplying the error level by a correction coefficient so as to obtain a control signal correction value for correcting the value of the control signal, and adjusting the value of the control signal to be delivered to said transmission power control means on the basis of the control signal correction value and a reference control value that is predetermined so as to generate an RF output signal having the predetermined power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of controlling transmission of a radio transmitter, comprising steps of:
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generating a radio frequency (RF) output signal having a predetermined power from a radio frequency (RF) signal according to the value of a control signal by means of a gain control; monitoring the RF output signal so as to obtain an average power level of the RF output signal; calculating an error level from the difference between the average power level and reference power data which corresponds to the predetermined power of the RF output signal; calculating error data by multiplying the error level by coefficient data so as to correct the value of the control signal; and adjusting the value of the control signal on the basis of the error data and reference control data that is predetermined so as to generate an RF output signal having the predetermined power. - View Dependent Claims (14, 15)
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Specification