Wireless Communication Distortion Compensation via Feedback Path Merging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the variation in analog characteristics of feedback paths associated with multiple power amplifiers leads to errors in feedback signals, reducing the accuracy of distortion compensation coefficients and thereby decreasing the distortion compensation performance.
Innovation Solution
A wireless communication apparatus that collectively corrects variations in analog characteristics across multiple feedback paths using a processor, allowing for the accurate updating of distortion compensation coefficients without increasing electrical power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual correction of analog characteristics is performed for each feedback path, then the distortion compensation accuracy is improved, but the electrical power consumption and device complexity increase significantly
Solution Approach 1:
The patent combines multiple feedback paths into a single equivalent feedback path for distortion compensation purposes. Instead of processing each feedback path separately, the system integrates the analog characteristics of all feedback paths into one unified model, allowing a single set of multipliers to correct all paths simultaneously. This merging approach maintains compensation accuracy while dramatically reducing the number of multipliers and power consumption.
Solution Approach 2:
The patent creates a universal correction mechanism that serves all feedback paths simultaneously. A single filter with shared multipliers performs the correction function for multiple feedback paths, making the correction system multi-functional. This universal approach eliminates the need for separate correction circuits for each feedback path, reducing overall system complexity and power consumption.
2Measurement precision
If individual correction of analog characteristics is performed for each feedback path, then the distortion compensation accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent merges the correction functions for multiple feedback paths into a single integrated correction unit. By combining the analog characteristics of all feedback paths into one equivalent model, the system requires only one set of multipliers instead of multiple separate sets. This significantly reduces the total number of multipliers needed in the system while maintaining the ability to compensate for analog variations across all paths.
Solution Approach 2:
The correction system is designed as a universal module that handles all feedback paths through a single equivalent path. This multi-functional approach allows one correction unit to perform the work of multiple separate units, reducing device complexity and the number of required multipliers while maintaining comprehensive correction coverage.
3Device complexity
If distortion compensation is collectively performed for multiple power amplifiers, then the system complexity is reduced, but the distortion compensation performance decreases due to analog characteristic variations
Solution Approach 1:
The patent introduces an intermediary element - an equivalent feedback path - that mediates between the multiple actual feedback paths and the single distortion compensation processor. This equivalent path acts as a representative model that captures the essential analog characteristics of all feedback paths, allowing collective processing while maintaining compensation accuracy. The intermediary equivalent path translates multiple varying paths into a single unified representation.
Solution Approach 2:
The patent transforms the parameters of multiple feedback paths into a single equivalent set of parameters. By changing the representation from multiple individual path parameters to one consolidated equivalent path parameter set, the system achieves both low complexity and high performance. This parameter transformation allows the use of a single correction model that accurately represents all feedback paths.
Data Source
AI summary
A wireless communication apparatus includes a plurality of antenna elements; a plurality of power amplifiers provided in the plurality of antenna elements; a processor that outputs a transmission signal to the plurality of power amplifiers; and a plurality of feedback paths each of which allows a feedback signal to be fed back from the plurality of power amplifiers to the processor, wherein the processor executes a process for collectively correcting variations in analog characteristics exhibited in the plurality of feedback paths, and a process for updating, by using the transmission signal and the feedback signal that are obtained by being corrected, a distortion compensation coefficient that is used to compensate nonlinear distortion produced in the plurality of power amplifiers.