Method and apparatus for distortionless peak reduction
First Claim
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1. A method for reducing a peak-to-average ratio (PAR) of a signal, comprising:
- (a) receiving a input signal;
(b) generating an offsetting signal associated with the input signal;
(c) combining the input signal and the offsetting signal so that the offsetting signal reduces the PAR of the input signal to produce a combined signal;
(d) processing the combined signal and the offsetting signal; and
(e) combining the processed combined signal and the processed offsetting signal.
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Abstract
The present invention reduces the peak-to-average power ratio (PAR) of a signal while at the same time providing improved signal-to-noise-and-distortion and increased dynamic range. In the context of a transmitter, the PAR of an input signal is reduced so that one or more elements of a transmitter can be operated with increased dynamic range. However, the initial PAR is restored before the signal is transmitted thereby removing distortion generated as the result of the PAR reduction. The initial PAR is reduced in the digital domain, converted into the analog domain, and then restored in the analog domain.
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Citations
44 Claims
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1. A method for reducing a peak-to-average ratio (PAR) of a signal, comprising:
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(a) receiving a input signal;
(b) generating an offsetting signal associated with the input signal;
(c) combining the input signal and the offsetting signal so that the offsetting signal reduces the PAR of the input signal to produce a combined signal;
(d) processing the combined signal and the offsetting signal; and
(e) combining the processed combined signal and the processed offsetting signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of reducing a peak-to-average ratio (PAR) of a signal, comprising:
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receiving a digital input signal;
formulating an anti-phase signal for the input signal;
combining the input and anti-phase signals to produce a peak-limited digital signal;
converting the peak-limited digital signal in a first digital-to-analog converter into a peak-limited analog signal;
converting the anti-phase digital signal in a second digital-to-analog converter into an anti-phase analog signal; and
combining the peak-limited and anti-phase analog signals to produce a combined analog signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method, comprising:
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reducing in a digital domain a peak-to-average ratio (AR) of a signal having an initial PAR;
converting the reduced PAR digital signal into the analog domain to provide a reduced PAR analog signal; and
removing distortion in the reduced PAR analog signal caused by the PAR reducing step in the analog domain. - View Dependent Claims (23, 24, 25)
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26. Apparatus for reducing a peak-to-average ratio (PAR) of an input signal, comprising:
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first electronic circuitry configured to generate an offsetting signal associated with the input signal;
a first combiner configured to combine the input signal and the offsetting signal so that the offsetting signal reduces the PAR of the input signal to produce a combined signal;
second electronic circuitry configured to process the combined signal and the offsetting signal; and
a second combiner configured to combine the processed combined signal and the processed offsetting signal. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. Apparatus for reducing a peak-to-average ratio (AR) of an input signal, comprising:
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first electronic circuitry configured to receive a digital input signal and to formulate an anti-phase signal for the input signal;
a first combiner configured to combine the input and anti-phase signals to produce a peak-limited digital signal;
a first digital-to-analog converter configured to convert the peak-limited digital signal into a peak-limited analog signal;
a second digital-to-analog converter configured to convert the anti-phase digital signal into an anti-phase analog signal; and
a second combiner configured to combine the peak-limited analog signal and the anti-phase analog signal. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification