Utility Meter Radio Communication With Kalman Phase Tracking

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Solution Overview

Problem

Narrow-band radio communication in utility meter systems is susceptible to interference, particularly in congested environments, leading to packet loss and energy inefficiency due to waiting for signal stabilization before transmission.

Innovation Solution

A method using decision-directed phase tracking with a Kalman filter to compensate for time-varying phase offsets, estimating phase offset prediction error covariance, and employing a feedback loop to enhance robustness against interference and low signal-to-noise ratios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If narrow-band radio communication is used in congested environments, then energy consumption is reduced and battery lifetime is extended, but communication reliability deteriorates due to in-band interference and packet loss

Engineering Contradiction:

Improvebattery consumptionVSAvoidcommunication reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the receiver detects interference conditions and sends feedback signals to the transmitter. The transmitter then adjusts its transmission parameters (frequency, power, timing) based on this feedback, creating a closed-loop system that adapts to changing interference conditions while maintaining energy efficiency and reliability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts transmission parameters based on real-time interference detection. The transmitter can change frequency channels, modify transmission power, or alter timing schedules in response to detected interference conditions, transforming a static narrow-band system into a dynamic one that maintains reliability without sacrificing energy efficiency

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If utility meters wait for oscillator warm-up before transmission, then signal stability is improved and phase tracking is maintained, but transmission delay increases and energy efficiency decreases

Engineering Contradiction:

Improvesignal stabilityVSAvoidtransmission delay

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The receiver performs preliminary actions by preparing its phase tracking mechanism in advance and using initial synchronization signals to establish tracking before actual data transmission begins. This allows the system to start transmission during oscillator warm-up without compromising signal stability, as the receiver is already prepared to track the signal

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The receiver provides feedback about its phase tracking status and signal quality to the transmitter. Based on this feedback, the transmitter can adjust its transmission timing or provide additional synchronization signals, enabling early transmission during oscillator warm-up while maintaining signal stability through active feedback control

Inventive Principle:

Principle #23Feedback

3Reliability

If decision-directed phase tracking with Kalman filter is implemented, then robustness against interference is improved and coherent demodulation reliability is enhanced, but device complexity increases

Engineering Contradiction:

Improvecoherent demodulation reliabilityVSAvoidreceiver complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex hardware-based phase tracking mechanisms with software-based Kalman filter algorithms. This substitution allows sophisticated interference suppression and phase tracking to be achieved through computational methods rather than complex hardware circuits, reducing physical device complexity while maintaining or improving demodulation reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The Kalman filter dynamically adjusts tracking parameters such as phase offset estimates and covariance values based on incoming signal characteristics. By changing these parameters adaptively rather than using fixed hardware settings, the system achieves high robustness against varying interference conditions without requiring complex hardware reconfiguration

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12438689B2Method for radio communication of utility meters with a data receiver

Publication Date: 2025.10.07 KAMSTRUP

AI summary

A radio communication method involves utility meters installed at distributed installation locations with a data receiver. Data is received from the utility meters. Data is modulated on a received signal having a time-varying phase offset. Decision-directed phase tracking compensates for the time-varying phase offset. The compensated received signal is coherently demodulated to extract data. Extracted data is modulated to reconstruct a replica of the received signal. A phase offset prediction error—comparison between compensated received signal and the replica—and a phase offset prediction error covariance-divergence of compensated received signal and reference value and/or of phase offset prediction error and error reference value—are estimated and input into a Kalman filter. A Kalman filter output provides a prediction of time-varying phase offset in a feedback loop to compensate time-varying phase offset of received signal before compensated received signal is coherently demodulated to extract data.