Receiver Compensation Models for Transmitter Backoff Changes
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Solution Overview
Problem
The change in backoff amount by a transmitter leads to nonlinear distortion of received signals, causing degradation in communication quality due to the receiver's inability to properly compensate for distortion.
Innovation Solution
A communication apparatus and system that includes a receiving unit to detect backoff changes, a compensation model based on backoff amounts, and a model creation unit to adaptively create and update compensation models to counteract distortion, ensuring effective signal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transmitter reduces backoff to improve power amplifier efficiency, then power amplifier efficiency is improved, but interference with other nearby communication apparatuses increases
Solution Approach 1:
The backoff amount is made dynamically adjustable rather than fixed. The transmitter can change the backoff amount based on communication conditions, allowing optimization between power amplifier efficiency and interference reduction. The receiver adapts by selecting appropriate compensation models corresponding to different backoff amounts.
Solution Approach 2:
The backoff amount parameter is changed to balance between power amplifier efficiency and interference. By adjusting this parameter, the system can operate in different modes: lower backoff for efficiency, higher backoff for interference reduction. The receiver compensates for distortion by selecting compensation models matched to the current backoff parameter.
2Use of energy by moving object
If the transmitter changes backoff amount, then power amplifier efficiency or interference reduction is improved, but the receiver's ability to properly compensate for distortion deteriorates
Solution Approach 1:
Multiple compensation models are prepared in advance, each corresponding to a specific backoff amount. When the transmitter changes the backoff amount, the receiver can immediately select the pre-prepared compensation model that matches the new backoff level, avoiding the need for real-time model creation and ensuring continuous accurate compensation.
Solution Approach 2:
The transmitter notifies the receiver of backoff amount changes. Based on this feedback information, the receiver selects the appropriate compensation model to match the current backoff level, ensuring accurate distortion compensation despite backoff changes.
3Device complexity
If the receiver uses a fixed compensation model, then compensation processing is simple, but it cannot properly compensate when backoff amount changes
Solution Approach 1:
The compensation model selection is made dynamic based on the backoff amount. Instead of using a single fixed compensation model, the receiver dynamically selects from multiple pre-prepared compensation models corresponding to different backoff amounts, maintaining both simplicity and accuracy.
Solution Approach 2:
Multiple compensation models are pre-prepared for different backoff amounts before actual communication. This preliminary preparation allows the receiver to quickly switch between models based on current backoff conditions without complex real-time calculations, balancing simplicity and accuracy.
Data Source
AI summary
A communication apparatus performs to: receive, from a transmitter, a backoff change amount indicating an amount by which a backoff amount of the transmitter has changed from a reference value, and a transmission signal transmitted by the transmitter; and compensate for distortion of the transmission signal using a compensation model for use in processing to compensate for the distortion of the transmission signal transmitted from the transmitter, the compensation model being determined based on the backoff change amount.