Transmitter Feedback Circuit for Multi-Channel Distortion Compensation
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Solution Overview
Problem
As the number of transmission systems increases, the circuit scale of the local signal generation part and the transmitter itself grows, leading to increased complexity and power consumption due to the need for multiple local signals with different frequencies for distortion compensation in existing transmitter designs.
Innovation Solution
A transmitter design that includes a feedback circuit with a delay circuit to delay transmission signals by different amounts of time, a combining unit to generate a combined signal, and a signal conversion unit to convert the combined signal to a common frequency, allowing for the calculation and feedback of distortion compensation coefficients to compensate for signal distortion across multiple transmission systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple local signals with different frequencies are used for distortion compensation in each transmission system, then distortion compensation accuracy is improved, but circuit scale and complexity increase
Solution Approach 1:
The patent combines multiple transmission signals into a single composite signal, processes it through one frequency conversion unit using a common local signal, and then separates the processed signal back into individual transmission signals. This merging approach allows distortion compensation to be performed centrally rather than requiring separate local signals for each transmission system, thereby reducing circuit scale while maintaining compensation accuracy.
Solution Approach 2:
The patent introduces a single frequency conversion unit that handles multiple transmission signals simultaneously, making it a universal component that serves all transmission systems. This multi-functional unit uses a common local signal for frequency conversion across different transmission systems, eliminating the need for multiple dedicated local signal generation units and reducing overall circuit complexity.
2Reliability
If multiple local signals with different frequencies are used for distortion compensation in each transmission system, then distortion compensation is maintained, but power consumption increases
Solution Approach 1:
The patent merges the processing of multiple transmission signals into a single frequency conversion path, which consumes less power than maintaining separate frequency conversion paths for each transmission system. By combining signals and using a shared local signal source, the overall power consumption is reduced while distortion compensation reliability is maintained through centralized processing.
3Productivity
If the number of transmission systems increases, then communication capacity is improved, but circuit scale of the transmitter increases
Solution Approach 1:
The patent employs a merging approach where multiple transmission signals are combined into a single composite signal that is processed through a shared frequency conversion unit. This allows the transmitter to handle multiple transmission systems (increasing communication capacity) without proportionally increasing the circuit scale, as the frequency conversion infrastructure is shared across all transmission systems rather than being duplicated.
Solution Approach 2:
The frequency conversion unit is designed as a universal component that can process multiple transmission signals simultaneously using a common local signal. This multi-functional design enables the transmitter to support an increasing number of transmission systems without requiring additional dedicated frequency conversion units for each system, thereby scaling communication capacity while controlling circuit complexity.
Data Source
AI summary
A transmitter includes: a transmission circuit that outputs, via a transmission amplifier, transmission signals of a same frequency band; and a feedback circuit that feeds back, to the transmission circuit, a distortion compensation coefficient that is used to compensate for distortion of the transmission signals. The feedback circuit includes: a delay circuit that delays each of the transmission signals by a different amount of time; a combining unit that combines the delayed transmission signals to generate a combined signal; a signal conversion unit that converts a frequency of the combined signal to a different frequency using a local signal that is common among the transmission signals, and generates a demodulated digital signal from the combined signal of which the frequency has been converted; and a distortion compensation calculation unit that calculates the distortion compensation coefficient based on the demodulated digital signal.