Signal Distortion Estimation Using Time-Varying Loopback Separation
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Solution Overview
Problem
Existing radio communication systems face challenges in accurately estimating and compensating for distortion characteristics of both the transmission and loop-back systems, which affects broadband communication stability and accuracy, particularly due to the use of power amplifiers that distort signals over time.
Innovation Solution
A signal processing apparatus that includes a signal generator, transmit and loop-back signal processors, a time-characteristic circuitry, and a distortion estimator to separately estimate and compensate for the distortion characteristics of both the transmission and loop-back systems by using separation characteristics that change with time, allowing for accurate distortion compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If loop back signals are used to estimate distortion characteristics, then distortion compensation can be performed, but the distortion characteristics of transmission system and LB system cannot be estimated separately
Solution Approach 1:
The patent divides the combined distortion characteristics into separate transmission system characteristics and LB system characteristics by introducing a time-varying separation characteristic. The processing circuitry separates the product of distortion characteristics into individual components through mathematical operations involving the time-varying separation characteristic, enabling independent estimation of each system's distortion characteristics.
2Adaptability or versatility
If power amplifier is used for broadband communication, then communication bandwidth is improved, but signal distortion increases over time
Solution Approach 1:
The patent uses loop back signals that carry distortion information from the power amplifier and transmission system back to the processing circuitry. This feedback mechanism enables continuous monitoring and estimation of distortion characteristics, allowing the system to compensate for time-varying distortions generated by the power amplifier in broadband communications.
3Reliability
If distortion compensation is performed using loop back signals, then transmission distortion can be compensated, but LB system distortion also affects the compensation accuracy
Solution Approach 1:
The patent extracts the LB system distortion characteristics from the combined distortion signal by using the time-varying separation characteristic. The processing circuitry isolates and removes the LB system component from the total distortion, leaving only the transmission system characteristics for accurate compensation, thereby improving both measurement precision and compensation reliability.
Data Source
AI summary
An electronic apparatus according to one embodiment, includes: a signal generator generating a first signal and a second signal; a first characteristic circuitry acquiring first and second distorted signals by giving first and second distortion characteristic to the first and second signals; a first time-characteristic circuitry acquiring a third distorted signal by giving a first time-characteristic to the first distorted signal and acquiring a fourth distorted signal by giving a second time-characteristic to the second distorted signal; a second characteristic circuitry acquiring a fifth distorted signal by giving a second distortion characteristic to the third distorted signal, and acquiring a sixth distorted signal by giving the second distortion characteristic to the fourth distorted signal; and a processing circuitry estimating at least one of the first distortion characteristic and the second distortion characteristic based on the first signal, the second signal, the fifth distorted signal, and the sixth distorted signal.