Digital Post-Distortion Signaling for UE Non-Linearity Control
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Solution Overview
Problem
Existing wireless communication systems face challenges with non-linear distortion in transmitter devices, leading to reduced power efficiency and interference, as conventional digital pre-distortion (DPD) processing is limited in effectiveness and not universally applicable across all network conditions.
Innovation Solution
Implementing digital post-distortion (DPoD) processing by enabling user equipment (UE) to transmit capability information about its non-linearity, allowing the base station (BS) to configure DPoD accordingly, ensuring both devices support DPoD processing when feasible, thereby optimizing power efficiency and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion (DPD) processing is used to reduce non-linear distortion, then transmission quality is improved, but power efficiency deteriorates and the solution is not universally applicable across all network conditions
Solution Approach 1:
The patent inverts the conventional DPD approach by implementing digital post-distortion (DPoD) processing at the receiver (base station) instead of at the transmitter (UE). This allows the transmitter to operate at higher power levels without applying complex pre-distortion, while the receiver compensates for the non-linear effects, thereby improving power efficiency while maintaining transmission quality.
Solution Approach 2:
The patent introduces capability signaling as an intermediary mechanism that enables conditional DPoD processing. The UE transmits capability information indicating whether it supports DPoD, and the base station uses this information to determine whether to apply post-distortion processing. This intermediary signaling layer allows the system to adaptively enable or disable DPoD based on network conditions and device capabilities, making the solution universally applicable.
2Use of energy by moving object
If DPoD processing is universally applied to all UEs, then power efficiency is improved, but device complexity increases and compatibility issues arise
Solution Approach 1:
The patent implements dynamic adaptability by enabling the system to adjust DPoD processing based on real-time capability information. The base station receives capability signaling from each UE and dynamically determines whether to apply DPoD processing on a per-UE basis. This dynamic approach allows the system to optimize power efficiency for DPoD-capable devices while maintaining simplicity and compatibility for devices that do not support DPoD, avoiding universal application of complex processing.
Solution Approach 2:
The patent changes the operational parameter of the system by introducing a capability indicator that can take different values (DPoD supported or not supported). Based on this parameter change, the base station adjusts its processing behavior accordingly. For UEs that support DPoD, the base station applies post-distortion processing and can operate with higher power efficiency; for UEs that do not support DPoD, the base station uses conventional processing, maintaining broad compatibility without increasing overall system complexity.
3Adaptability or versatility
If capability signaling for DPoD is implemented, then adaptability is improved, but communication overhead increases
Solution Approach 1:
The patent applies partial action by implementing capability signaling only when necessary for DPoD operation. The UE transmits capability information indicating DPoD support, and the base station uses this information selectively to determine whether to apply post-distortion processing. This partial implementation of capability signaling provides the adaptability needed for DPoD while minimizing overhead by not requiring continuous or excessive signaling exchanges, achieving a balance between network adaptability and communication efficiency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit, to a base station (BS), UE capability information including transmission non-linearity information related to a digital post-distortion processing capability; and transmit, to the BS and after transmitting the UE capability information, signaling for digital post-distortion processing. Numerous other aspects are provided.