Compact wide dynamic range transmitter for point to point radio
First Claim
Patent Images
1. A radio frequency transmitter comprising:
- a modem configured to modulate one or more input data signals to generate a first modulated signal;
an upconversion module configured to receive the first modulated signal and to generate a first radio frequency (“
RF”
) signal based on the first modulated signal;
a power amplifier configured to amplify the first RF signal to generate a first amplified RF signal, the power amplifier nonlinearly causing first distortion in the first amplified RF signal;
a feedback module configured to receive at least a portion of the first amplified RF signal and to downconvert the at least a portion of the first amplified RF signal to generate a downconverted feedback signal;
a predistorter configured to add predistortion to a second modulated signal based on the downconverted feedback signal to reduce second distortion in a second RF amplified signal, the second distortion being caused by the power amplifier; and
an attenuator configured to attenuate power of the second modulated signal based on the downconverted feedback signal to further reduce the second distortion in the second amplified RF signal.
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Abstract
A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which receives the in-phase and quadrature phase signals and provides a radio frequency output signal. A predistortion module receives the radio frequency signal, downconverts the radio frequency signal to an intermediate frequency signal, and downconverts the intermediate frequency signal to a baseband feedback signal. The transmitter samples the feedback signal and provides an adaptive predistortion signal to the modem.
85 Citations
18 Claims
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1. A radio frequency transmitter comprising:
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a modem configured to modulate one or more input data signals to generate a first modulated signal; an upconversion module configured to receive the first modulated signal and to generate a first radio frequency (“
RF”
) signal based on the first modulated signal;a power amplifier configured to amplify the first RF signal to generate a first amplified RF signal, the power amplifier nonlinearly causing first distortion in the first amplified RF signal; a feedback module configured to receive at least a portion of the first amplified RF signal and to downconvert the at least a portion of the first amplified RF signal to generate a downconverted feedback signal; a predistorter configured to add predistortion to a second modulated signal based on the downconverted feedback signal to reduce second distortion in a second RF amplified signal, the second distortion being caused by the power amplifier; and an attenuator configured to attenuate power of the second modulated signal based on the downconverted feedback signal to further reduce the second distortion in the second amplified RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for transmitting a signal comprising the steps of:
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providing a co-located modem and transmitter in an assembly; receiving at the modem one or more input data signals; generating, by the modem, a first modulated signal by modulating the one or more input data signals; upconverting the first modulated signal to generate a first radio frequency (“
RF”
) signal;amplifying, by a power amplifier, the first RF signal to generate a first amplified RF signal, the amplifying of the first RF signal by the power amplifier nonlinearly causing first distortion in the first amplified RF signal; transmitting the first amplified RF signal with a transmitter; downconverting at least a portion of the first amplified RF signal to generate a downconverted feedback signal; adding predistortion to a second modulated signal based on the downconverted feedback signal to reduce second distortion in a second RF amplified signal, the second distortion being caused by the power amplifier; and attenuating power of the second modulated signal based on the downconverted feedback signal to further reduce the second distortion in the second RF amplified signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification