Directional Digital Pre-Distortion for Inter-UE Interference Mitigation
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Solution Overview
Problem
Current wireless communication systems face challenges in mitigating inter-user equipment (UE) interference, particularly due to out-of-band distortion causing adjacent channel interference, which affects signal quality and reliability in downlink communications.
Innovation Solution
The implementation of directional digital pre-distortion (DPD) techniques, where a UE applies DPD based on a configuration indicating specific directions to minimize interference, using a combination of DPD coefficients for both the main uplink transmission beam and beams other than the main transmission beam to reduce out-of-band emissions in specific directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If directional digital pre-distortion is applied to reduce out-of-band emissions in specific directions, then inter-UE interference is mitigated, but device complexity increases due to the need for multiple DPD coefficients and directional processing
Solution Approach 1:
The patent applies different DPD coefficients to different spatial directions (main beam direction versus other directions). This local quality approach allows the system to optimize interference mitigation specifically in directions where other UEs are located, rather than applying uniform DPD processing to all transmissions. The base station determines separate DPD coefficients for the main beam and for other beams, enabling targeted interference reduction while maintaining signal quality in the desired direction.
2Manufacturing precision
If multiple DPD coefficients are used for different beams, then out-of-band distortion is reduced, but processing time and computational requirements increase
Solution Approach 1:
The base station determines and configures the multiple DPD coefficients (for main beam and other beams) in advance before the actual uplink transmission occurs. This preliminary action allows the UE to have the distortion correction parameters ready beforehand, reducing the computational burden and processing time during the actual transmission. The base station performs the complex coefficient determination and sends them to the UE prior to the uplink data transmission, so the UE can apply pre-computed DPD rather than calculating it in real-time.
3Reliability
If directional DPD is implemented with combination of coefficients, then signal-to-interference-plus-noise ratio is maintained, but ease of operation decreases due to configuration management
Solution Approach 1:
The base station acts as an intermediary that manages the complexity of DPD coefficient configuration. Instead of requiring the UE to independently determine and manage multiple DPD coefficients for different directions, the base station performs the complex determination of appropriate DPD coefficients and sends them as configuration to the UE. This intermediary approach maintains high SINR through proper DPD coefficient selection while relieving the UE of the operational burden of managing complex directional DPD parameters.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration indicating one or more directions for applying directional digital pre-distortion (DPD) to mitigate interference in a direction to another UE. The UE may transmit a communication to a wireless node based at least in part on applying the directional DPD according to the configuration. Numerous other aspects are described.