Tone Reservation Remapping for ADC Signal Distortion
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Solution Overview
Problem
Current wireless communication systems face challenges in managing signal distortion due to analog-to-digital conversion (ADC) bits used for signal quantization, particularly in 5G-NR systems, which affects power consumption and performance.
Innovation Solution
Implementing a tone reservation mechanism that remaps tone reservations and data based on signal distortion estimates, allowing for dynamic adjustment of ADC resolution to reduce clipping and quantization distortion, thereby improving UE performance and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ADC resolution is increased to reduce quantization distortion, then signal quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic ADC resolution adjustment where the number of ADC bits is adapted based on signal conditions (clipping probability, quantization distortion levels) rather than using a fixed high resolution. This allows the system to use higher resolution only when necessary to maintain signal quality while reducing power consumption during conditions that tolerate lower resolution.
Solution Approach 2:
The system changes the ADC resolution parameter dynamically based on measured signal characteristics. By monitoring clipping events and quantization distortion and adjusting the ADC bit depth accordingly, the system optimizes the trade-off between signal quality and power consumption by using the minimum necessary resolution at any given time.
2Use of energy by moving object
If ADC resolution is decreased to reduce power consumption, then power efficiency is improved, but signal distortion increases
Solution Approach 1:
The patent employs feedback mechanisms where the system monitors signal quality metrics (clipping probability, quantization distortion) and uses this information to adjust ADC resolution dynamically. This closed-loop control ensures that power consumption is reduced while maintaining signal quality within acceptable thresholds by increasing resolution only when distortion becomes problematic.
Solution Approach 2:
The system transitions from static to dynamic ADC resolution, allowing real-time adaptation to signal conditions. This enables the system to operate at lower power consumption levels during favorable conditions while automatically increasing resolution when signal quality deteriorates, thus resolving the contradiction between power efficiency and signal quality.
3Measurement precision
If tone reservation is used to reduce clipping distortion, then signal quality is improved, but system complexity increases
Solution Approach 1:
The patent applies tone reservation in advance to prevent clipping distortion before it occurs. By reserving specific subcarriers and adjusting their power levels proactively based on predicted signal conditions, the system reduces clipping distortion without requiring complex real-time processing during signal transmission, thus managing system complexity while improving signal quality.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may determine a signal distortion based at least in part on a number of analog-to-digital conversion (ADC) bits used for signal quantization at a user equipment (UE). The base station may remap a tone reservation and data based at least in part on the signal distortion. The base station may transmit, to the UE, a remapped tone reservation and remapped data. Numerous other aspects are provided.