Method and apparatus of estimating non-linear amplifier response in an overlaid communication system
First Claim
1. A method of estimating non-linear characteristics of an amplifier used to amplify a composite signal in a radio communication system, the method comprising:
- sampling the composite signal that includes a plurality of inbound signals overlay on an outbound signal, wherein the outbound signal is utilized as a training signal;
generating coarse estimates of response of the amplifier based on the samples of the composite signal and the training signal;
removing interference associated with the plurality of inbound signals from the estimation of the response of the amplifier by curve-fitting and estimating interference characteristics of the composite signal; and
outputting an estimated response of the amplifier.
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Abstract
An approach is provided estimating non-linear characteristics of an amplifier (such as a Travelling Wave Tube Amplifier) used to amplify a composite signal in a radio communication system. The composite signal, which includes a plurality of inbound signals overlay on an outbound signal, is sampled. The outbound signal is utilized as a training signal. Coarse estimates of the response of the amplifier is generated based on the samples of the composite signal and the training signal. Further, the interference associated with the inbound signals are removed from the estimation of the response of the amplifier by curve-fitting and estimating interference characteristics of the composite signal. An estimated response of the amplifier is thus output, and can be utilized to provide accurate non-linearity compensation and cancellation.
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Citations
20 Claims
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1. A method of estimating non-linear characteristics of an amplifier used to amplify a composite signal in a radio communication system, the method comprising:
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sampling the composite signal that includes a plurality of inbound signals overlay on an outbound signal, wherein the outbound signal is utilized as a training signal;
generating coarse estimates of response of the amplifier based on the samples of the composite signal and the training signal;
removing interference associated with the plurality of inbound signals from the estimation of the response of the amplifier by curve-fitting and estimating interference characteristics of the composite signal; and
outputting an estimated response of the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for estimating non-linear characteristics of an amplifier operating in a radio communication system, the apparatus comprising:
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means for sampling a composite signal that includes a plurality of inbound signals overlay on an outbound signal, wherein the outbound signal is utilized as a training signal;
means for generating coarse estimates of response of the amplifier based on the samples of the composite signal and the training signal;
means for removing interference associated with the plurality of inbound signals from the estimation of the response of the amplifier by curve-fitting and estimating characteristics of the composite signal; and
means for outputting an estimated response of the amplifier. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of compensating for amplifier non-linearity in a radio communication system, the method comprising:
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estimating distortion characteristics of an amplifier in real-time based on samples of a received composite signal and a training signal, wherein the composite signal includes a plurality of inbound signals overlay on an outbound signal that is utilized as the training signal;
iteratively curve-fitting to remove uplink interference and downlink interference from the estimates; and
modifying the received composite signal based on the estimates. - View Dependent Claims (19, 20)
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Specification