DPoD Receiver MLC Set Partitioning for Nonlinear QAM Clipping
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling non-linear distortions in wireless communication signals, particularly at the cell edge, where digital pre-distortion (DPD) processing is limited in effectiveness and power efficiency due to strong non-linearity-induced clipping effects.
Innovation Solution
The implementation of a digital post-distortion (DPoD) receiver that performs multi-level coding (MLC) set partitioning, partitioning a quadrature amplitude modulation (QAM) constellation set by bounding the maximum Euclidean distance of errors associated with decoding least significant bits, to improve the handling of strong non-linearities and enhance communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion (DPD) processing is applied to handle non-linear distortions, then communication performance is improved, but power efficiency deteriorates due to strong non-linearity-induced clipping effects
Solution Approach 1:
Instead of applying pre-distortion at the transmitter (DPD), the patent applies post-distortion processing at the receiver. The receiver equalizer performs MLC set partitioning and iterative processing to compensate for non-linear distortions after they have occurred, reversing the conventional approach and achieving better power efficiency while maintaining communication performance
Solution Approach 2:
The patent segments the QAM constellation into multiple subsets using MLC set partitioning, where each subset corresponds to different bit positions (MSB, LSB). This segmentation allows iterative equalization processing to handle different bit groups separately, improving the ability to recover signals from strongly non-linear distorted transmissions
2Reliability
If traditional DPD processing is used, then some non-linear distortion compensation is achieved, but effectiveness deteriorates at cell edge due to strong non-linearity-induced clipping effects
Solution Approach 1:
The patent performs MLC set partitioning and iterative equalization processing in advance before final symbol detection. By preparing multiple candidate symbol estimates through iterative processing and then selecting the most likely symbol, the system proactively compensates for clipping effects rather than reacting to them after damage is done
Solution Approach 2:
The patent introduces an intermediary iterative equalization process between the received distorted signal and the final symbol decision. The equalizer performs multiple iterations of MLC set partitioning and candidate generation, acting as a mediator that gradually recovers the original signal from strongly non-linear distorted states
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may receive a wireless communication signal. The wireless communication device may process the wireless communication signal using a digital post distortion receiver based at least in part on performing a multi-level coding (MLC) set partitioning operation, wherein performing the MLC set partitioning operation comprises partitioning a quadrature amplitude modulation constellation set by bounding a maximum Euclidean distance of an error associated with decoding one or more least significant bits. Numerous other aspects are provided.