Adaptive Jammer Cancellation in Power-Line Communication
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Solution Overview
Problem
Current power line communication technologies face challenges in efficiently decoding signals in noisy channels, achieving time and frequency diversity, removing signal interference, maintaining signal levels, measuring channel quality for high transmission rates, and providing robustness to both wideband and narrowband symbol synchronization.
Innovation Solution
A method and apparatus that utilize an adaptive filtering procedure to cancel signal interference, incorporating an OFDM system with DBPSK modulation, robust FEC encoding, and a jammer remover to generate a jammer-canceled signal, supporting multiple frequency bands and operation modes to enhance data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If adaptive filtering procedure is used to cancel jammer signals, then narrowband interference removal is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the harmful narrowband jammer signals from the broadband PLC signal using an adaptive notch filter. The filter selectively identifies and cancels out specific frequency components corresponding to jammer signals while preserving the desired broadband communication signal, thereby separating the harmful interference from the useful signal.
Solution Approach 2:
The patent dynamically adjusts the parameters of the adaptive notch filter, specifically the notch frequency and quality factor (Q), to track and cancel moving jammer signals. The filter parameters are continuously adapted based on the detected jammer characteristics, allowing the system to maintain effective interference cancellation as jammer frequencies change over time.
2Productivity
If broadband PLC technology is applied for high speed data transmission, then transmission rate is improved, but signal interference and noise become more severe
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects the presence and characteristics of narrowband jammer signals and feeds this information back to the adaptive notch filter. This closed-loop system continuously monitors the channel conditions and adjusts the filter parameters accordingly, enabling the high-speed broadband PLC system to maintain performance even in the presence of interfering signals.
Data Source
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AI summary
An embodiment is a method and apparatus to cancel signal interference. A jammer remover removes an interfering signal from an input signal to generate a jammer-canceled signal using an adaptive filtering procedure. A jammer detector detects interference caused by the interfering signal.