Wireless DPoD Non-Linearity Estimation Using Dynamic-Range Signals
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Solution Overview
Problem
Existing wireless communication systems lack accurate methods for estimating power amplifier non-linearity, which hinders the effectiveness of digital post distortion (DPoD) and limits the achievable transmit power and signal-to-noise ratio.
Innovation Solution
Implementing a method for wireless communication devices to estimate power amplifier non-linearity using signals with a dynamic range, such as demodulation reference signals or data messages, and applying DPoD based on these estimates to improve accuracy and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital post distortion (DPoD) is applied without accurate power amplifier non-linearity estimation, then the system can operate with simpler estimation methods, but the accuracy of DPoD is degraded and transmit power is limited
Solution Approach 1:
The patent applies preliminary action by using demodulation reference signals (DMRS) or data messages transmitted before the actual data transmission to estimate the power amplifier non-linearity characteristics. This pre-estimation allows the receiver to prepare accurate compensation parameters in advance, improving DPoD accuracy without adding complexity to the main data transmission path.
Solution Approach 2:
The patent introduces intermediary signals (demodulation reference signals or data messages with known characteristics) that serve as mediators between the transmitter and receiver. These intermediary signals carry information about the power amplifier's non-linearity, enabling accurate estimation without requiring direct measurement of the amplified signal itself.
2Power
If higher transmit power is used to improve signal-to-noise ratio, then data rates can be increased, but power amplifier non-linearity increases and degrades signal quality
Solution Approach 1:
The patent implements feedback by having the receiver estimate the power amplifier non-linearity characteristics and use this information to apply digital post distortion compensation. The compensation parameters are derived from the estimated non-linearity, creating a feedback loop that counteracts the harmful non-linear effects even at high transmit powers.
Solution Approach 2:
The patent converts the harmful power amplifier non-linearity into a beneficial effect by using the non-linearity characteristics themselves as the basis for compensation. By estimating the non-linearity from transmitted signals and applying inverse distortion, the system transforms the distortion problem into a solvable estimation problem that improves overall signal quality.
3Measurement precision
If accurate power amplifier non-linearity estimation is implemented using dedicated pilot signals, then DPoD accuracy is improved, but system overhead increases
Solution Approach 1:
The patent applies universality by making existing signals (demodulation reference signals and data messages) serve multiple functions. These signals simultaneously perform their primary communication function and provide the basis for power amplifier non-linearity estimation, eliminating the need for separate dedicated pilot signals and reducing system overhead.
Solution Approach 2:
The patent merges the non-linearity estimation function with the existing reference signal and data transmission functions. By combining multiple purposes into existing signal structures, the system achieves accurate DPoD without adding separate overhead signals, thus reducing total system overhead while maintaining estimation accuracy.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for non-linearity estimation techniques for digital post distortion (DPoD) in a wireless system. In some aspects, a first wireless device may estimate a power amplifier (PA) non-linearity associated with a second wireless device using select signaling from the second wireless device. For example, the first wireless device may use a received signal to estimate the PA non-linearity if a dynamic power range associated with the signal triggers the estimation of the PA non-linearity (such as if the dynamic power range associated with the signal satisfies, or is expected to satisfy, a threshold dynamic power range). If the dynamic power range of the signal triggers the estimation of the PA non-linearity, the first wireless device may introduce DPoD to signaling received from the second wireless device in accordance with the estimation of the PA non-linearity.