Multiantenna Distortion Compensation via Multiplexed Feedback
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Solution Overview
Problem
The existing multiantenna communication systems face an increase in circuit scale and power consumption due to the need for extensive feedback systems for digital predistortion, particularly when using phase shifters and independent A/D converters for each antenna element, which complicates the miniaturization and efficiency of power amplifiers.
Innovation Solution
A multiantenna communication device that employs a processor to perform distortion compensation using a distortion compensation coefficient, with a multiplexer to combine feedback signals from multiple power amplifiers and an A/D converter to update the coefficient based on a multiplexed feedback signal, thereby minimizing the circuit scale by eliminating the need for separate feedback paths for each antenna element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent feedback circuits with A/D converters are provided to each antenna element, then distortion compensation precision is improved, but circuit scale and device complexity increase
Solution Approach 1:
The patent combines multiple feedback signals from multiple antenna elements into a single multiplexed feedback signal using a multiplexer. This merging approach allows one shared A/D converter to process all feedback signals, eliminating the need for separate A/D converters for each antenna element while maintaining distortion compensation precision through subsequent digital separation and processing of the multiplexed signal.
Solution Approach 2:
The patent implements a universal feedback processing architecture where a single A/D converter serves multiple antenna elements by processing their multiplexed feedback signals. This multi-functional approach allows the same hardware component to perform distortion compensation measurement for all antenna elements, reducing overall circuit complexity while preserving measurement precision through digital signal processing.
2Adaptability or versatility
If phase shifters are provided to each antenna element for beamforming, then beamforming capability is improved, but circuit scale and power consumption increase
Solution Approach 1:
The patent merges the feedback paths of multiple antenna elements into a single shared feedback path using a multiplexer. This consolidation eliminates the need for separate feedback circuits, phase shifters, and A/D converters for each antenna element, significantly reducing circuit scale while preserving beamforming capability through digital processing of the multiplexed feedback signal.
3Measurement precision
If separate feedback circuits are provided to each antenna element, then distortion compensation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple feedback signals into a single multiplexed signal that is processed by one shared A/D converter and processing circuitry. This consolidation dramatically reduces the number of active components consuming power while maintaining distortion compensation accuracy through digital separation and individual processing of each antenna element's feedback signal in the digital domain.
Data Source
AI summary
A multiantenna communication device forms a directional beam by adding an antenna weight to respective signals of a plurality of antenna elements. The multiantenna communication device includes: a processor that executes performing distortion compensation on a transmission signal by using a distortion compensation coefficient; a plurality of power amplifiers that are provided corresponding to the antenna elements, and that amplify the transmission signal subjected to the distortion compensation by the processor; a multiplexer that multiplexes signals output from the power amplifiers to feed back; and an analog/digital (A/D) converter that A/D converts a multiplex feedback signal that is obtained by the multiplexer, wherein the processor executes updating the distortion compensation coefficient by using the multiplex feedback signal A/D converted by the A/D converter and the transmission signal.