Adaptive DPD Unit Control for PA Linearity Across Bandwidth Changes
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining the linearity of power amplifiers due to non-linear characteristics and memory effects, leading to signal distortion, especially when bandwidth and resource allocation change.
Innovation Solution
An electronic device and method that dynamically adjusts the complexity of the digital predistortion (DPD) circuit based on resource allocation, activating or deactivating DPD units to compensate for memory effects and non-linearities, using a finite impulse response (FIR) filter structure and adaptive resource allocation to optimize DPD modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the complexity of the DPD circuit is increased to improve distortion compensation accuracy, then the linearity of the power amplifier is improved, but the device complexity and computational overhead increase
Solution Approach 1:
The patent implements dynamic adjustment of DPD circuit complexity by activating or deactivating specific DPD units based on real-time operating conditions such as bandwidth and resource allocation. This allows the system to adapt the compensation accuracy to match the actual needs of the transmission scenario, avoiding unnecessary computational overhead while maintaining linearity when required.
Solution Approach 2:
The system changes operational parameters of the DPD circuit by adjusting the number of active DPD units, memory order, and filter coefficients based on bandwidth and resource allocation conditions. This enables the DPD circuit to optimize its complexity level dynamically, improving distortion compensation only when the operating conditions warrant higher accuracy.
2Measurement precision
If the number of active DPD units is increased to handle wider bandwidths, then the compensation accuracy is improved, but the computational load and processing time increase
Solution Approach 1:
The patent dynamically adjusts the number of active DPD units based on the current bandwidth and resource allocation. When bandwidth increases or resource allocation changes, the system activates additional DPD units to maintain compensation accuracy. When bandwidth decreases, units are deactivated to reduce computational load and processing time, thus optimizing the trade-off between accuracy and speed.
Solution Approach 2:
The DPD circuit is divided into multiple independent DPD units that can be selectively activated or deactivated. This segmentation allows the system to scale the computational resources precisely according to the bandwidth and resource allocation requirements, avoiding unnecessary processing when full complexity is not needed.
3Productivity
If the DPD circuit complexity is adaptively adjusted based on resource allocation, then the efficiency is improved, but the control complexity increases
Solution Approach 1:
The system implements feedback mechanisms that monitor bandwidth and resource allocation conditions, and use this information to automatically adjust the DPD circuit configuration. This feedback loop enables adaptive optimization of transmission efficiency without requiring manual intervention, as the system self-adjusts the DPD units based on real-time operating conditions.
Solution Approach 2:
The DPD circuit is designed to self-adjust its complexity by automatically activating or deactivating units based on pre-defined criteria related to bandwidth and resource allocation. This self-service capability reduces the need for complex external control mechanisms, as the system autonomously optimizes its own configuration to maintain transmission efficiency.
Data Source
AI summary
According to embodiments, a method performed by an electronic device includes: identifying a channel bandwidth; identifying one or more active DPD units among a plurality of DPD units of a digital pre-distortion (DPD) circuit based on the channel bandwidth and amount of resource allocated within the channel bandwidth; generating a DPD output signal of the DPD circuit based on the one or more active DPD units; generating an amplifier output signal based on the DPD output signal of the DPD circuit, a digital-to-analog converter (DAC), and a power amplifier (PA). While the DPD output signal is generated, at least one DPD unit different from the one or more active DPD units among the plurality of DPD units of the DPD circuit is deactivated.