Signal pre-processor for an amplifying system
First Claim
1. A signal pre-processor for an amplifying system, for use in providing a multiplexed, multi-carrier signal to an amplifier to give an amplified signal comprising a wanted frequency range, the pre-processor comprising:
- a) a sample rate setting arrangement for providing a digital, multiplexed signal as an over-sampled signal in complex form, the signal being over-sampled with respect to the wanted frequency range;
b) an amplitude processor for receiving the over-sampled signal and processing it to obtain a set of amplitude values;
c) an amplitude value converter for converting at least some of the amplitude values to complex correction values; and
d) a signal correcting processor for applying the complex correction values to the over-sampled signal to create a pre-distorted digital signal, prior to amplification by the amplifier,such that signal distortion in the amplified signal can be at least partially avoided.
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Accused Products
Abstract
A signal pre-processor, for at least partially correcting non-linear performance of a high power amplifier (“HPA”), operates on an over-sampled signal in complex form in the digital domain. By converting the over-sampled signal to amplitude values, the pre-processor is enabled to apply correction values, based on the amplitude values, which correction values incorporate both amplitude and phase correction in respect of distortion generated in the HPA. The use of an over-sampled signal allows out-of-band correction values to be applied to correct out-of-band distortion arising in the signal processing path, for instance in the linearization process itself. The out-of-band distortion can otherwise alias back in-band, creating noise at the HPA.
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Citations
29 Claims
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1. A signal pre-processor for an amplifying system, for use in providing a multiplexed, multi-carrier signal to an amplifier to give an amplified signal comprising a wanted frequency range, the pre-processor comprising:
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a) a sample rate setting arrangement for providing a digital, multiplexed signal as an over-sampled signal in complex form, the signal being over-sampled with respect to the wanted frequency range; b) an amplitude processor for receiving the over-sampled signal and processing it to obtain a set of amplitude values; c) an amplitude value converter for converting at least some of the amplitude values to complex correction values; and d) a signal correcting processor for applying the complex correction values to the over-sampled signal to create a pre-distorted digital signal, prior to amplification by the amplifier, such that signal distortion in the amplified signal can be at least partially avoided. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of processing a multiplexed, multi-carrier signal, for use in providing a pre-distorted signal to an amplifier for amplification to give an amplified signal comprising a wanted frequency range, the method comprising:
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a) receiving the multiplexed signal and processing it to provide an over-sampled digital signal in complex form; b) processing the over-sampled signal to obtain a set of amplitude values; c) converting at least some of the amplitude values to complex correction values; and d) applying the complex correction values to the over-sampled digital signal to create the pre-distorted signal, such that signal distortion in the amplified signal is at least partially avoided. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification