PA Predistortion Feedback for Signal Linearity and Power Control
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Solution Overview
Problem
Existing communication technologies face challenges in improving the linearity of power amplifiers (PAs) without compromising efficiency, due to nonlinear distortion caused by PAs, which is exacerbated by unstable digital predistortion (DPD) coefficients influenced by non-ideal channel factors and interference.
Innovation Solution
A communication method where a first communication apparatus reports performance indicator information to a second apparatus, enabling accurate determination of nonlinear compensation status and coefficient information for the PA, thereby optimizing transmit power and improving signal linearity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If higher power is used to amplify the signal, then the efficiency of the PA is improved, but the linearity of the signal deteriorates due to nonlinear distortion
Solution Approach 1:
The patent applies preliminary action by performing digital predistortion processing on the signal before it enters the power amplifier. The network device sends measurement signals to the terminal device, which calculates DPD coefficients in advance. These coefficients are then used to pre-compensate the signal, so that when the signal passes through the non-linear PA at high power, the predistortion already applied counteracts the nonlinear distortion, maintaining signal linearity while operating at high efficiency
Solution Approach 2:
The patent implements feedback by having the terminal device measure the downlink signal quality and feed back DPD coefficient information to the network device. The network device uses this feedback to adjust and optimize the predistortion coefficients, creating a closed-loop system that continuously improves compensation accuracy. This feedback mechanism enables the system to adapt to changing channel conditions and maintain optimal linearity-efficiency balance
2Manufacturing precision
If DPD processing is performed to improve signal linearity, then the linearity of the output signal is improved, but the reliability of the DPD coefficient becomes unstable due to non-ideal channel factors and interference
Solution Approach 1:
The patent introduces an intermediary approach by having the terminal device calculate DPD coefficients based on received measurement signals and then feed back coefficient information to the network device. This intermediary process allows the system to account for actual channel conditions and interference experienced by the signal, creating more reliable and adaptive DPD coefficients that are tailored to the specific propagation environment rather than using fixed or theoretically optimal values
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the DPD coefficients based on measured signal quality and channel conditions. The terminal device measures downlink signal characteristics and uses these measurements to determine appropriate coefficient values, which are then fed back to the network device. This dynamic parameter adjustment allows the system to adapt to varying channel conditions, interference levels, and signal qualities, maintaining reliable compensation across different operating scenarios
Data Source
AI summary
Embodiments of this application provide a communication method and a related apparatus, so that a first communication apparatus reports first performance indicator information to a second communication apparatus, thereby helping the second communication apparatus determine a nonlinear compensation status of first coefficient information for a power amplifier. This helps the second communication apparatus determine appropriate transmit power for the power amplifier, and improves linearity of a signal output by the second communication apparatus, thereby improving performance of the second communication apparatus. The method in embodiments of this application includes: A first communication apparatus receives a first signal from a second communication apparatus, where the first signal is a signal obtained by performing nonlinear compensation based on first coefficient information. The first communication apparatus sends first performance indicator information to the second communication apparatus, where the first performance indicator information is determined based on a performance indicator of the first signal.