DPD Calibration Pulses With Silence Gaps for Low-Power RF Linearity
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Solution Overview
Problem
Current DPD calibration techniques for wireless communication devices are too time-consuming and power-consuming for battery-operated devices, leading to potential power management failures and network performance degradation due to nonlinear distortions in RF power amplifiers.
Innovation Solution
A method and apparatus for DPD calibration using a pattern of amplitude steps separated by silence gaps, with interlaced high and low amplitudes, to reduce power consumption and calibration time, utilizing a feedback loop and accumulator component to compute AM/AM and AM/PM values for lookup table entries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DPD calibration is performed using traditional continuous amplitude steps, then measurement precision is improved, but power consumption and calibration time increase excessively
Solution Approach 1:
The patent applies periodic action by using discrete amplitude steps separated by silence gaps instead of continuous amplitude sweeping. The calibration signal is transmitted in periodic pulses with specific duty cycles, allowing the system to perform DPD calibration in intermittent bursts rather than continuously. This reduces average power consumption while maintaining calibration accuracy through accumulated samples during the active periods.
Solution Approach 2:
The patent segments the continuous calibration process into discrete amplitude steps with silence gaps between them. Each amplitude step is transmitted as a separate pulse train, and the calibration is performed in stages rather than as a continuous operation. This segmentation allows power management between steps and reduces overall power consumption while maintaining measurement precision through systematic accumulation of data at each segment.
2Measurement precision
If DPD calibration is performed using traditional continuous amplitude steps, then measurement precision is improved, but calibration time increases excessively
Solution Approach 1:
The patent maintains continuity of useful action by accumulating samples across multiple pulse trains at each amplitude step. Rather than requiring a single long continuous measurement, the system continuously accumulates useful calibration data during each pulse train and combines these accumulations across steps. This approach reduces total calibration time while maintaining precision through the cumulative effect of multiple measurements.
Solution Approach 2:
By using periodic pulse trains with silence gaps instead of continuous sweeping, the patent reduces calibration time. The periodic structure allows faster transitions between amplitude steps and enables parallel processing during silence gaps, significantly reducing the total time required for DPD calibration while maintaining measurement accuracy through the periodic accumulation of samples.
3Measurement precision
If pulse width is increased to improve signal detection, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the pulse width parameter across different calibration steps. Instead of using a fixed or excessively long pulse width throughout, the system adjusts pulse width parameters according to specific calibration requirements at different amplitude steps. This optimized parameter selection improves signal detection accuracy while minimizing power consumption by using the minimum necessary pulse duration for each measurement.
Data Source
AI summary
A method for digital predistortion (DPD) calibration in a wireless communication device is provided that includes transmitting, by transmission circuitry of the wireless communication device, a plurality of pulses, where each pulse corresponds to an amplitude step in a pattern of amplitude steps, where the amplitude steps are separated by silence gaps, receiving each pulse in receiver circuitry of the wireless communication device, generating, by an accumulator component of the wireless communication device, an accumulated sample for each pulse based on a plurality of samples output by the receiver circuitry for the pulse, and computing, by a processor of the wireless communication device, amplitude dependent gain (AM/AM) and amplitude dependent phase shift (AM/PM) values for each accumulated sample.