Wireless Receiver Noise Tracking for Sensitivity

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Solution Overview

Problem

Wireless receivers employing amplitude modulation techniques face limitations in sensitivity and operational range due to Signal-to-Noise Ratio (SNR) issues, especially in environments with interference, which degrades performance and renders them impractical for medical applications.

Innovation Solution

A wireless receiver architecture that includes a pattern discriminator for asynchronous signal detection, a predictor for pseudo-synchronous signal synchronization, a noise tracker for interference rejection, and a demodulator for enhanced SNR, utilizing a combination of asynchronous and pseudo-synchronous modes to improve sensitivity and reject interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If amplitude modulation techniques are used in power saving receivers, then energy consumption is reduced, but sensitivity and operational range are limited due to SNR issues

Engineering Contradiction:

Improveenergy consumptionVSAvoidsensitivity

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The receiver is divided into two distinct operational modes: asynchronous mode for initial pattern detection and pseudo-synchronous mode for enhanced signal processing. This segmentation allows the system to use low-power asynchronous operation most of the time while switching to high-performance pseudo-synchronous mode only when needed, resolving the contradiction between energy consumption and sensitivity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The receiver dynamically switches between asynchronous and pseudo-synchronous modes based on signal detection needs. The system transitions from static low-power operation to dynamic high-performance operation when interference or noise degradation is detected, allowing adaptive optimization of both energy consumption and sensitivity

Inventive Principle:

Principle #15Dynamics

2Device complexity

If amplitude modulation techniques are used, then device complexity is reduced, but performance degrades significantly in the presence of interference

Engineering Contradiction:

Improvedevice complexityVSAvoidperformance robustness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system performs preliminary asynchronous pattern detection before committing to full pseudo-synchronous operation. This preliminary action allows the receiver to identify potential signals early in asynchronous mode, then activate the more complex pseudo-synchronous processing only when necessary, maintaining reliability without always incurring high complexity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pattern discriminator serves as an intermediary between the simple asynchronous receiver and the complex pseudo-synchronous processor. It detects characteristic patterns in asynchronous mode and triggers pseudo-synchronous processing only when patterns are detected, acting as a mediator that balances complexity and reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If the receiver operates continuously in pseudo-synchronous mode, then sensitivity and interference rejection are improved, but energy consumption increases

Engineering Contradiction:

Improvesignal detection accuracyVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The receiver employs periodic switching between asynchronous and pseudo-synchronous modes rather than continuous operation. It operates in low-power asynchronous mode periodically, switching to pseudo-synchronous mode only when characteristic patterns are detected, thereby achieving improved signal detection accuracy without continuous high energy consumption

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system applies different operational qualities to different time periods: asynchronous mode for normal periods and pseudo-synchronous mode for critical detection periods. This local quality differentiation allows the receiver to optimize energy consumption during non-critical periods while maintaining high sensitivity when needed

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8711979B2Method of improving sensitivity and interference rejection in wireless receivers

Publication Date: 2014.04.29 MICROSEMI SEMICON

AI summary

A wireless receiver for receiving a signal with a characteristic pattern includes a predictor for predicting the presence of a non-zero value of the characteristic pattern. A tracker tracks a noise component in the received signal between predicted non-zero values. The resulting noise component is subtracted from the received signal to output a processed signal, which is then decoded by a pattern discriminator and demodulator. The wireless receiver is less sensitive to noise and interference.