DIGITALLY CONTROLLABLE NONLINEAR PRE-EQUALIZER
First Claim
1. A digitally controllable nonlinear pre-equalizer circuit receiving an input signal and generating an output signal, the circuit comprising:
- a splitter for dividing the input signal into a first signal path and a second signal path;
an attenuator and a time delay element in the first signal path, the attenuator and the time delay element operable to generate a linear signal;
a mixer and a vector modulator in the second signal path, the mixer being responsive to a signal from a digital to analog converter coupled to a processor chip providing a digital signal to the digital to analog converter, the mixer and vector modulator operable to generate a nonlinear signal; and
a summer for summing the linear signal and the nonlinear signal to generate the output signal.
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Abstract
A digitally controllable nonlinear pre-equalizer system receiving an input signal and generating an output signal, the system including a splitter for dividing the input signal into a first signal path and a second signal path, an attenuator and a time delay element in the first signal path, the attenuator and the time delay element operable to generate a linear signal, a mixer and a vector modulator in the second signal path, the mixer being responsive to a signal from a digital to analog converter coupled to a processor chip providing a digital signal to the digital to analog converter, the mixer and vector modulator operable to generate a nonlinear signal, and a summer for summing the linear signal and the nonlinear signal to generate the output signal.
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Citations
18 Claims
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1. A digitally controllable nonlinear pre-equalizer circuit receiving an input signal and generating an output signal, the circuit comprising:
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a splitter for dividing the input signal into a first signal path and a second signal path;
an attenuator and a time delay element in the first signal path, the attenuator and the time delay element operable to generate a linear signal;
a mixer and a vector modulator in the second signal path, the mixer being responsive to a signal from a digital to analog converter coupled to a processor chip providing a digital signal to the digital to analog converter, the mixer and vector modulator operable to generate a nonlinear signal; and
a summer for summing the linear signal and the nonlinear signal to generate the output signal. - View Dependent Claims (2, 3, 4)
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5. A digitally controllable nonlinear pre-equalizer circuit receiving an input signal and generating an output signal, the circuit comprising:
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a splitter for dividing the input signal into a first signal path and a second signal path;
an attenuator and a time delay element in the first signal path, the attenuator and the time delay element operable to generate a linear signal;
a mixer and a vector modulator in the second signal path, the mixer being responsive to a signal from a digital to analog converter coupled to a processor chip providing a digital signal to the digital to analog converter, the processor chip being operable to store a plurality of power amplifier parameters corresponding to a plurality of power amplifiers, each power amplifier parameter being provideable as the digital signal, the mixer and vector modulator operable to generate a nonlinear signal; and
a summer for summing the linear signal and the nonlinear signal to generate the output signal. - View Dependent Claims (6)
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7. An amplifier system receiving an input signal and generating an output signal comprising:
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a power amplifier;
a splitter for dividing the input signal into a first signal path and a second signal path;
an attenuator and a time delay element in the first signal path, the attenuator and the time delay element operable to generate a linear signal;
a mixer and a vector modulator in the second signal path, the mixer being responsive to a signal from a digital to analog converter coupled to a processor chip providing a digital signal to the digital to analog converter, the mixer and vector modulator operable to generate a nonlinear signal; and
a summer for summing the linear signal and the nonlinear signal to generate a gain expansion signal, the gain expansion signal being input to the power amplifier, the power amplifier providing the output signal. - View Dependent Claims (8, 9, 10)
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11. A satellite system receiving an input signal and generating an output signal comprising:
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a satellite;
a power amplifier disposed on said satellite;
a nonlinear pre-equalizer circuit coupled to said power amplifier, said nonlinear pre-equalizer circuit including, a splitter for dividing the input signal into a first signal path and a second signal path;
an attenuator and a time delay element in the first signal path, the attenuator and the time delay element operable to generate a linear signal;
a mixer and a vector modulator in the second signal path, the mixer being responsive to a signal from a digital to analog converter coupled to a processor chip providing a digital signal to the digital to analog converter, the mixer and vector modulator operable to generate a nonlinear signal; and
a summer for summing the linear signal and the nonlinear signal to generate a gain expansion signal, the gain expansion signal being input to the power amplifier, the power amplifier providing the output signal. - View Dependent Claims (12, 13, 14)
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15. A method of digitally controlling a nonlinear pre-equalizer circuit receiving an input signal and generating an output signal, the method comprising:
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dividing the input signal into a first signal path and a second signal path;
generating a linear signal by attenuating and time delaying the divided input signal in the first signal path;
generating a nonlinear signal by mixing and phase shifting the divided input signal in the second signal path, the mixing being responsive to a signal provided by a digital to analog converter coupled to a processor chip; and
summing the linear signal and the nonlinear signal to generate the output signal. - View Dependent Claims (16, 17, 18)
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Specification