Pilot Power Scaling for PA Nonlinearity Compensation
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Solution Overview
Problem
The nonlinearity of power amplifiers (PAs) in wireless communication systems leads to signal distortion, limiting the transmission power and resulting in coverage loss when back-off processes are applied to prevent nonlinear operation.
Innovation Solution
A method is introduced to compensate for PA nonlinearity by deriving and reporting an amplitude scaling factor based on the distribution of pilot and data signals, allowing for accurate power allocation and compensation in the wireless communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmission power is increased through the power amplifier, then transmission coverage and data rates are improved, but signal distortion occurs due to amplifier nonlinearity
Solution Approach 1:
The system performs preliminary characterization of the power amplifier's nonlinear behavior by transmitting pilot signals at different power levels and measuring the resulting signal distortion. This advance knowledge is stored as compensation data that is later applied to correct the main data signals, allowing the system to operate at higher power levels while maintaining signal quality.
Solution Approach 2:
The receiver measures the signal distortion caused by amplifier nonlinearity and feeds back compensation information to the transmitter. This feedback loop enables the system to continuously adjust and correct for nonlinear effects, allowing operation at higher transmission powers without sacrificing signal reliability.
2Reliability
If back-off process is applied to prevent nonlinear operation, then signal distortion is reduced, but transmission coverage is lost
Solution Approach 1:
The system characterizes the amplifier's nonlinear behavior and converts this previously harmful effect into a usable compensation model. By measuring and storing the nonlinear characteristics, the system can apply inverse compensation to the transmitted signals, effectively canceling out the distortion and allowing operation at maximum power without coverage loss.
Solution Approach 2:
The system changes the operational parameters by introducing compensation factors that adjust the signal characteristics based on the measured nonlinear behavior. This allows the amplifier to operate in its nonlinear region while the compensation parameters restore signal quality, effectively decoupling the relationship between operating power level and signal distortion.
3Measurement precision
If pilot signal power is increased to improve nonlinearity compensation accuracy, then data reception performance is improved, but power allocation efficiency is reduced
Solution Approach 1:
The system applies partial power allocation to pilot signals, using just enough power to achieve sufficient measurement accuracy for nonlinearity characterization. Rather than allocating excessive power to all signals, the system uses targeted power allocation only where needed for compensation measurements, optimizing the balance between measurement accuracy and overall power efficiency.
Data Source
AI summary
The disclosure relates to a method and a device for transmitting and receiving a signal by a base station or a terminal in a wireless communication system. Specifically, a method performed by a first device in a wireless communication system includes deriving an amplitude scaling factor based on a comparison between amplitude distribution of a pilot signal corresponding to a first time resource domain and the amplitude distribution of a data signal corresponding to a second time resource domain; and transmitting, to a second device, a physical channel including the pilot signal and the data signal and the amplitude scaling factor, wherein the pilot signal is transmitted with a power determined based on the amplitude scaling factor, and power compensation for the data signal is based on the amplitude scaling factor.