Adaptive I/Q Sample Bit Width for Low-Power Receiver Interfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices with wireless communications capabilities face excessive power consumption due to fixed bit widths of I/Q samples, which are not optimized for varying radio conditions, leading to inefficient power usage.
Innovation Solution
The bit width of I/Q samples is dynamically adjusted based on radio conditions using baseband circuitry, reducing the bit width in poor conditions and increasing it in good conditions to minimize power consumption without sacrificing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a fixed bit width is used for I/Q samples, then the device complexity is reduced and ease of operation is improved, but power consumption increases excessively
Solution Approach 1:
The patent implements dynamic adjustment of the bit width for I/Q samples based on radio conditions. The baseband circuitry monitors signal quality metrics and adaptively changes the bit width parameter, transitioning from a static fixed value to a dynamic variable that optimizes power consumption while maintaining wireless performance under varying channel conditions.
Solution Approach 2:
The patent changes the bit width parameter of I/Q samples based on evaluated radio conditions. When signal quality is good, a higher bit width is used; when signal quality degrades, the bit width is reduced. This parameter adaptation allows the system to optimize power consumption by matching the data representation precision to the actual channel conditions.
2Use of energy by moving object
If the bit width is decreased to reduce power consumption, then energy efficiency improves, but wireless performance may be sacrificed
Solution Approach 1:
The patent implements a feedback mechanism where the baseband circuitry continuously evaluates wireless performance metrics (such as signal-to-noise ratio, bit error rate, or other quality indicators) and uses this feedback to adjust the bit width parameter. This closed-loop control ensures that bit width reduction does not compromise wireless performance below acceptable thresholds, as performance degradation would trigger an increase in bit width.
Solution Approach 2:
The system dynamically adapts the bit width based on real-time radio conditions, allowing it to optimize power consumption when conditions permit while automatically maintaining performance when conditions deteriorate. This dynamic behavior resolves the contradiction by making the bit width a flexible parameter rather than a fixed compromise.
3Reliability
If the bit width is increased to maintain wireless performance, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent changes the bit width parameter dynamically based on radio conditions rather than using a fixed high value. When radio conditions are poor, a higher bit width is used to maintain performance; when conditions are good, the bit width is reduced to save power. This conditional parameter adjustment resolves the contradiction by applying high bit width only when necessary for performance.
4Measurement precision
If a higher bit width is used for I/Q samples, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent adjusts the bit width parameter of I/Q samples based on evaluated radio conditions. When signal quality is high, measurement precision requirements are lower, so a reduced bit width suffices. When signal quality is poor, higher precision is needed to maintain reliable demodulation, so the bit width is increased. This adaptive approach matches precision requirements to actual channel conditions.
Solution Approach 2:
The system transitions from a static I/Q sample bit width to a dynamic one that adapts to radio conditions. This dynamic adjustment allows the measurement precision to be optimized for each channel condition, avoiding the excessive power consumption associated with always using high precision when it is not needed.
Data Source
AI summary
An electronic device may be provided with an antenna, a receiver, and baseband circuitry coupled to the receiver over a digital interface. The receiver may receive radio-frequency signals using the antenna and may generate digital in-phase and quadrature-phase (I/Q) samples from the radio-frequency signals. The I/Q samples may have a bit width and may be transmitted to the baseband circuitry over the digital interface. The baseband circuitry may evaluate a radio condition of the receiver based on the I/Q samples. The baseband circuitry may adjust the bit width of the I/Q samples based on the radio condition. For example, the baseband circuitry may decrease the bit width when wireless performance metric data falls below a threshold and/or may increase the bit width when the wireless performance metric data exceeds a threshold. This may minimize power consumed by the digital interface without sacrificing wireless performance.