Power Control via Non-Linear Interference Analysis
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Solution Overview
Problem
Wireless communication systems face challenges in accurately determining whether non-linear distortion noise or thermal noise dominates the signal-to-noise ratio (SNR) in uplink transmissions, leading to inefficient power control adjustments that can reduce throughput.
Innovation Solution
Implementing digital post-distortion (DPOD) at the base station to measure post-DPOD SNR and differentiate between non-linear distortion noise and thermal noise components, allowing for precise power output back-off indications to be sent to user equipment (UE) for optimized transmit power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power control adjustments are made without differentiating between non-linear distortion noise and thermal noise, then power control complexity is reduced, but power control accuracy deteriorates leading to reduced throughput
Solution Approach 1:
The patent segments the total noise into distinct components: non-linear distortion noise and thermal noise. By separating these noise sources and measuring them independently, the system can identify which noise type dominates and apply appropriate power control adjustments, thereby improving throughput without requiring overly complex measurement systems.
Solution Approach 2:
The patent changes the measurement parameter from total noise level to noise component composition. By measuring the ratio or difference between non-linear distortion noise and thermal noise components, the system can determine the dominant noise type and adjust power control parameters accordingly, resolving the contradiction between measurement simplicity and control accuracy.
2Measurement precision
If DPOD processing is implemented to differentiate noise components, then power control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies digital post-distortion (DPOD) processing as a preliminary step before noise measurement. By pre-compensating for non-linear distortions through DPOD, the system simplifies the subsequent noise component differentiation process, reducing the overall complexity while maintaining high measurement precision.
Solution Approach 2:
The patent implements a feedback mechanism where the base station measures post-DPOD SNR and noise components, then uses this information to generate power output back-off indications sent to the UE. This closed-loop feedback system optimizes power control accuracy while managing complexity through automated decision-making based on measured parameters.
3Speed
If power output back-off indications are frequently updated based on noise analysis, then power control responsiveness is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial updates of power output back-off indications based on the dominant noise type. Rather than continuously updating regardless of conditions, the system adjusts power control parameters selectively when noise component analysis indicates a change in dominant noise type, reducing signaling overhead while maintaining responsive power control.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may receive an uplink transmission from a user equipment (UE) over a wireless channel and measure a post-digital post-distortion (post-DPOD) signal-to-noise ratio (SNR) of the uplink transmission. The base station may generate a power output back-off indication for the UE according to the post-DPOD SNR and a change in a post-DPOD noise level of the transmission between a non-linear distortion noise component and a thermal noise component. The base station may transmit the power output back-off indication and a downlink transmission to the UE. In response, the base station may receive an uplink transmission from the UE over the wireless channel. The uplink transmission may be based on the power output back-off indication, a signal quality metric of the downlink transmission, or both.