System for predistortion and post-distortion correction of both a receiver and transmitter during calibration
First Claim
1. A system for distortion compensation embodied in a transceiver, said system comprisinga predistorter operably disposed between a digital transmitter and a power amplifier;
- a post-distorter operably disposed between a receiver amplifier and a digital receiver;
said system being configurable to operate in a configuration mode with said transmitter and receiver active; and
said post-distorter adapted to compensate for nonlinearities in the receiver amplifier and, in configuration mode, produce post-distorted in-phase and quadrature-phase output signals and communicate such signals to the predistorter by filtering amplified signals from the receiver amplifier using a low pass filter, converting the filtered signals to digital signals using an analog to digital converter, producing the post-distorted in-phase and quadrature-phase output signals based upon the digital signals, and communicating the post-distorted in-phase and quadrature-phase output signals to the predistorter; and
said predistorter adapted to compensate for nonlinearities in the power amplifier by linearizing output from the digital transmitter.
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Abstract
A post-distorter compensates for receiver nonlinearity in calibration mode. Linearized receiver-side output from the post-distorter is used to correctly compensate for transmitter-side nonlinearities in calibration mode. The post-distorter also compensates for receiver-side nonlinearities during normal receive mode. Thus, the post-distorter features dual modes of use, a calibration mode, wherein calibration signals received from the adjacent transmitter are linearized by the post-distorter and a normal receive mode, wherein communication signals from a remote transmitter are linearized by the post-distorter.
23 Citations
14 Claims
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1. A system for distortion compensation embodied in a transceiver, said system comprising
a predistorter operably disposed between a digital transmitter and a power amplifier; -
a post-distorter operably disposed between a receiver amplifier and a digital receiver; said system being configurable to operate in a configuration mode with said transmitter and receiver active; and said post-distorter adapted to compensate for nonlinearities in the receiver amplifier and, in configuration mode, produce post-distorted in-phase and quadrature-phase output signals and communicate such signals to the predistorter by filtering amplified signals from the receiver amplifier using a low pass filter, converting the filtered signals to digital signals using an analog to digital converter, producing the post-distorted in-phase and quadrature-phase output signals based upon the digital signals, and communicating the post-distorted in-phase and quadrature-phase output signals to the predistorter; and said predistorter adapted to compensate for nonlinearities in the power amplifier by linearizing output from the digital transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for distortion compensation embodied in a transceiver, said system comprising
a predistorter operably disposed between a digital transmitter and a power amplifier; -
a post-distorter operably disposed between a receiver amplifier and a digital receiver; said system being configurable to operate in a configuration mode with said transmitter and receiver active; and said post-distorter adapted to compensate for nonlinearities in the receiver amplifier and, in configuration mode, produce post-distorted in-phase and quadrature-phase output signals and communicate such signals to the predistorter, and said predistorter adapted to compensate for nonlinearities in the power amplifier. - View Dependent Claims (14)
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Specification