DMRS Peak Shaping for Accurate Digital Post Distortion
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately compensating for transmission non-linearities induced by power amplifiers, leading to inefficiencies and errors in signal demodulation due to mismatched peak-to-average power ratios between demodulation reference signals and data signals.
Innovation Solution
A transmitting device adjusts the 1%-tile peak value of demodulation reference signal constellation points to match or exceed the peak value of data signals, enabling more accurate compensation for transmission non-linearities through digital post distortion techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the peak value of demodulation reference signal is kept at conventional levels, then the signal maintains standard power characteristics, but digital post distortion accuracy deteriorates due to mismatch with data signal peak-to-average power ratio
Solution Approach 1:
The patent changes the peak value parameter of the demodulation reference signal to match the peak-to-average power ratio characteristics of data signals. This parameter adjustment enables accurate digital post distortion compensation while maintaining power amplifier efficiency, resolving the contradiction between measurement precision and energy loss.
2Measurement precision
If the peak value of demodulation reference signal is increased to match data signal characteristics, then digital post distortion accuracy improves, but transmission power requirements increase
Solution Approach 1:
The patent applies preliminary action by adjusting the peak value of the demodulation reference signal before transmission to match data signal characteristics. This pre-adjustment enables accurate digital post distortion compensation at the receiver, improving demodulation accuracy without requiring excessive transmission power.
3Measurement precision
If conventional demodulation reference signal sequences are used, then implementation complexity remains low, but channel estimation accuracy deteriorates due to non-linear power amplifier effects
Solution Approach 1:
The patent modifies the peak value parameter of the demodulation reference signal to better represent actual data signal characteristics after power amplifier processing. This parameter change improves channel estimation accuracy for digital post distortion while maintaining relatively simple implementation through standardized signal generation procedures.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A first wireless device may identify a set of data resource elements for transmitting data in one or more symbols periods. The first wireless device may generate, for the one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. The first wireless device may transmit, to a second wireless device in the one or more symbol periods, the set of data resource elements and the set of pilot resource elements. The second wireless device may decode a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine the demodulation reference signal.