Adaptive Frequency Notching in Power Line Telecommunications
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Solution Overview
Problem
Existing Power Line Telecommunications (PLT) systems face coexistence limitations with broadcasting services due to interference from radio broadcast signals, making it difficult to reliably and timely detect broadcast signal ingress and manage noise levels.
Innovation Solution
The implementation of adaptive frequency notching and adaptive transmit power management in communications systems, where PLT modems detect broadcast signals by measuring signal power in narrow frequency bands and adjust transmit power to suppress interference, allowing for reliable noise measurements and quick detection of broadcast signal ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If adaptive frequency notching is implemented to reduce interference with broadcast signals, then coexistence with broadcasting services is improved, but detection reliability and timing of broadcast signal ingress remains challenging
Solution Approach 1:
The system dynamically adjusts the transmit power level based on detected signal conditions. The transmit power is varied to create optimal conditions for noise measurement, allowing the system to adaptively respond to changing broadcast signal presence while maintaining reliable detection capability
Solution Approach 2:
The system performs periodic noise measurements at different power levels. By alternating between different transmit power states and measuring noise characteristics during each state, the system can reliably detect broadcast signal ingress through pattern recognition across multiple measurement cycles
2Measurement precision
If transmit power is adjusted to facilitate noise measurements, then detection of broadcast signals is improved, but communication performance may be affected
Solution Approach 1:
The system applies partial power adjustment only during specific measurement intervals rather than continuously. Transmit power is modified temporarily to obtain accurate noise measurements, then restored to optimal communication levels, achieving measurement precision without sustained impact on data throughput
Solution Approach 2:
The system maintains continuous communication operation while interspersing brief measurement periods. By keeping the communication channel active and only temporarily adjusting power for measurements, the system ensures continuous useful action with minimal disruption to productivity
Data Source
AI summary
A communications system includes a receiver unit connected with a transmission channel. The receiver unit determines a signal power of a first communications signal received over the transmission channel. A transmitter unit is connected with the transmission channel and transmits a second communications signal, wherein a gain of the communications signal being output by the transmitter unit is controllable. A control unit controls the gain of the transmitter unit in response to the determined signal power. At the receiver unit, detection of broadcast signal ingress during data communication is improved and methods for avoiding disturbances between coexisting communications systems may become more reliable. Different distances between successive training symbols suitable for channel estimation may be provided to enhance the noise measurement.