Transmitter Amplifier Operating Point Estimation via Receiver Feedback
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Solution Overview
Problem
In communications systems, accurately determining the operating point of a transmitter amplifier without special instrumentation on the transmitter is challenging, especially due to temperature and frequency changes, which can lead to excessive adjacent channel interference and reduced power efficiency.
Innovation Solution
A method and system that use a receiver to process received transmission signals, generating a replica signal to estimate the initial source signal and determine an optimal parametric function for the transmitter amplifier through an iterative non-linear curve-fitting process, allowing for reliable measurement of the amplifier's operating point without requiring special instrumentation on the transmitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the amplifier is operated with sufficient backoff to remain in the linear operation region, then adjacent channel interference is reduced, but power efficiency decreases and cost increases
Solution Approach 1:
The system uses feedback from the receiver to the transmitter to dynamically control the amplifier operating point. The receiver measures signal quality metrics (EVM, BER) and feeds this information back to the transmitter, which adjusts the drive level to the amplifier to optimize the trade-off between linearity and power efficiency.
Solution Approach 2:
The system dynamically changes the operating parameters of the amplifier by adjusting the drive level based on feedback. This allows the amplifier to operate at different points on its characteristic curve, optimizing performance for different conditions rather than being fixed at a conservative operating point.
2Use of energy by moving object
If the amplifier is operated with minimal backoff to improve power efficiency, then cost and power consumption are reduced, but adjacent channel interference increases
Solution Approach 1:
The feedback mechanism continuously monitors signal quality and provides real-time adjustments to the transmitter. This allows the system to operate the amplifier at higher efficiency points while maintaining acceptable interference levels through dynamic compensation.
Solution Approach 2:
The system transitions from a static operating point to a dynamic one where the amplifier drive level can be adjusted in real-time based on channel conditions, temperature, and signal characteristics, allowing optimization of both efficiency and interference.
3Ease of operation
If the drive level to the amplifier is not carefully controlled, then the amplifier may be overdriven resulting in excessive adjacent channel interference
Solution Approach 1:
The feedback loop automatically controls the drive level to the amplifier based on measured signal quality, eliminating the need for manual calibration and ensuring the amplifier operates within acceptable parameters under varying conditions.
Solution Approach 2:
The system performs self-adjustment by using the receiver to measure performance and automatically controlling the transmitter operating point, eliminating the need for external instrumentation or manual intervention at the transmitter.
4Measurement precision
If special instrumentation is added to the transmitter to measure operating parameters, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
Instead of measuring parameters at the transmitter and sending them to the receiver, the system inverts the approach by having the receiver measure signal quality and feed this information back to control the transmitter, eliminating the need for transmitter instrumentation.
Solution Approach 2:
The channel itself serves as the measurement medium, with the receiver acting as an intermediary that measures the actual transmitted signal quality and provides feedback, replacing the need for direct transmitter measurements.
Data Source
AI summary
An apparatus includes a receiver component, a first signal processing component and a second signal processing component. The receiver component can receive a transmission signal, wherein the received transmission signal reflects an encoded and modulated initial source signal, amplified via a source transmitter, and transmitted over one or more channels of a wireless communications network. The first signal processing component can process the received transmission signal to generate a replica transmission signal that estimates the encoded and modulated initial source signal. The second signal processing component can determine an optimal parametric function for modeling the source transmitter, wherein the determination of the optimal parametric function comprises an iterative non-linear curve-fitting process, and wherein the optimal parametric function reflects one or more parameters of the source transmitter.