MIMO RF Transmitter Correction Architecture for Nonlinear Distortion
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Solution Overview
Problem
The increasing complexity and power consumption of radio frequency transmitters and receivers due to multiple-input multiple-output technologies, particularly in correcting nonlinear distortion, is exacerbated by the need for multiple correction circuits per channel, which consumes significant resources and increases area occupation.
Innovation Solution
Implementing a combined architecture with one primary correction circuit and N discrete secondary correction circuits, where the primary circuit corrects common nonlinear distortion across channels, and the secondary circuits correct differentiated distortion, reducing the need for individual correction circuits on each channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent correction circuits are used for each transmit channel, then nonlinear distortion correction is achieved, but power consumption and device complexity increase proportionally with the number of channels
Solution Approach 1:
The correction function is segmented into two independent parts: a first correction circuit that corrects common nonlinear distortion shared by all channels, and multiple second correction circuits that correct individual nonlinear distortion for each channel. This segmentation allows the power-consuming correction function to be shared rather than duplicated across all channels, reducing total power consumption while maintaining correction effectiveness.
Solution Approach 2:
The first correction circuit is designed to serve multiple transmit channels simultaneously by correcting common nonlinear distortion that affects all channels. This multi-functional approach allows a single correction circuit to perform the correction function for N channels, eliminating the need for N separate correction circuits and thereby reducing overall power consumption and device complexity.
2Reliability
If independent correction circuits are used for each transmit channel, then nonlinear distortion correction is achieved, but device complexity and area occupation increase with the number of channels
Solution Approach 1:
The correction system is divided into a first correction circuit handling common distortion and multiple second correction circuits handling individual channel distortion. This segmentation reduces the total number of correction circuits needed compared to having fully independent correction circuits for each channel, thereby reducing device complexity and area occupation.
Solution Approach 2:
The first correction circuit provides universal correction capability for common nonlinear distortion across all transmit channels. This multi-functional design allows one correction circuit to serve multiple channels, reducing the overall quantity of correction circuits and simplifying the device architecture.
3Measurement precision
If multiple correction circuits are used per channel, then correction precision is improved, but power consumption increases significantly
Solution Approach 1:
The correction precision is maintained by segmenting the correction function into two independent circuits with distinct roles: the first correction circuit addresses common nonlinear distortion, and the second correction circuits address individual channel distortion. This segmentation ensures that both common and individual distortion components are corrected, maintaining high precision while avoiding the power consumption of having fully redundant correction circuits for each channel.
Solution Approach 2:
Instead of providing full correction capability for each channel through multiple correction circuits, the system applies partial correction through the first correction circuit for common distortion and supplemental correction through second circuits for individual channel distortion. This partial action approach achieves sufficient correction precision without the excessive power consumption of complete redundancy.
Data Source
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AI summary
Embodiments of this application relate to the field of circuit technologies, and provide a radio frequency receiver, a radio frequency transmitter, and a communications device, to reduce resources consumed for correcting nonlinear distortion and improve operating performance of a radio frequency transceiver. The radio frequency transmitter includes: N transmit channels, where each transmit channel includes one nonlinear module; a primary correction circuit, coupled to each of N nonlinear modules that correspond to the N transmit channels, and configured to provide a primary correction signal for the N nonlinear modules; and N secondary correction circuits, where the N secondary correction circuits are coupled to the N nonlinear modules respectively, and each secondary correction circuit is configured to provide a secondary correction signal for a nonlinear module coupled to the secondary correction circuit. The primary correction signal and a secondary correction signal that is provided by a first secondary correction circuit (namely, any one of the N secondary correction circuits) may be used to correct nonlinear distortion in a first nonlinear module (namely, a nonlinear module coupled to the first secondary correction circuit).