Power Amplifier Power Detection for Digital Pre-Distortion Retraining
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Solution Overview
Problem
In RF communication systems, power amplifiers face challenges in managing power efficiently to prolong battery life and maintain suitable transmit power levels, particularly in 5G technology where features like beamforming and high spectral efficiency pose technical complexities.
Innovation Solution
A mobile device with a transmit chain that includes a digital pre-distortion circuit and a power detector to generate a detection signal for initiating a retraining sequence of the digital pre-distortion circuit, based on detecting output power mismatches between the power amplifier and antenna, ensuring efficient power management and linearization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power amplifier output power is increased to maintain suitable transmit power levels, then transmit power level is improved, but power consumption increases reducing battery life
Solution Approach 1:
The patent implements a feedback mechanism where a power detector monitors the output power of the power amplifier and generates a detection signal. This feedback loop enables the system to detect mismatches between the power amplifier and antenna, and automatically initiate retraining of the digital pre-distortion circuit to optimize performance while managing power consumption efficiently.
Solution Approach 2:
The system dynamically adjusts the digital pre-distortion parameters based on detected power amplifier output power and mismatch conditions. By changing the pre-distortion parameters in response to detected conditions, the system maintains optimal transmit power levels while adapting to varying operational states, thereby managing power consumption effectively.
2Reliability
If digital pre-distortion retraining is initiated frequently to maintain linearization accuracy, then signal linearization is improved, but processing time and computational resources increase
Solution Approach 1:
The power detector provides continuous monitoring and feedback on power amplifier output power, enabling the system to detect mismatch conditions. Retraining is initiated only when mismatches are detected, rather than continuously, which maintains signal linearization accuracy while avoiding unnecessary processing time consumption during stable operational conditions.
Solution Approach 2:
The system employs periodic monitoring of power amplifier output power through the power detector, with retraining sequences initiated periodically based on detected mismatch conditions. This periodic approach ensures maintained linearization accuracy while minimizing unnecessary retraining operations that would consume computational resources and time.
Data Source
AI summary
Apparatus and methods for retraining digital pre-distortion are disclosed. In certain embodiments, a mobile device includes a transmit chain and a front end system. The transmit chain generates a transmit signal and converts the transmit signal to a radio frequency input signal, and includes a digital pre-distortion circuit that provides digital pre-distortion to the transmit signal. The front end system includes a power amplifier that amplifies the radio frequency input signal to generate a radio frequency output signal, and a power detector that generates a detection signal based on detecting an output power of the power amplifier. The detection signal controls initiation of a retraining sequence of the digital pre-distortion circuit.