Notch Filter RFI Rejection in Wireline Receivers
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Solution Overview
Problem
Wireline communication systems face performance limitations due to radio frequency interference (RFI), which appears as common-mode noise and can degrade receiver performance, especially in systems like DSL and Ethernet over copper cables.
Innovation Solution
The implementation of notch filters and boost blocks in communication systems to attenuate RFI, with notch filters reducing RFI within the operating signal bandwidth and boost blocks compensating for signal power losses, thereby enhancing communication robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If notch filters are used to attenuate RFI within the operating signal bandwidth, then RF interference rejection is improved, but signal power loss increases
Solution Approach 1:
The notch filter extracts and removes only the specific RFI frequency components from the signal bandwidth while leaving the rest of the signal intact. This selective extraction allows RFI rejection without unnecessarily attenuating valid signal components, thereby reducing overall signal power loss.
Solution Approach 2:
The filter applies different attenuation characteristics to different frequency regions: strong attenuation at RFI frequencies and minimal attenuation elsewhere. This localized quality adjustment ensures that RFI is rejected effectively while preserving signal power in the non-RFI frequency regions.
2Reliability
If notch filters are used to attenuate RFI, then communication robustness is improved, but device complexity increases
Solution Approach 1:
The notch filter acts as an intermediary component between the RFI source and the receiver, providing a dedicated mechanism for RFI rejection. This specialized intermediary handles the complex task of frequency-selective attenuation, allowing the rest of the communication system to remain relatively simple while achieving robust RFI rejection.
3Power
If boost blocks are used to compensate for signal power losses, then signal power is improved, but device complexity increases
Solution Approach 1:
The boost block performs preliminary amplification of the signal power before transmission, compensating for the power losses that will occur later in the signal chain due to notch filtering. This advance power compensation ensures that the signal maintains adequate power levels throughout the communication system without requiring complex real-time power adjustment mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively rejects both in-band and out-of-band RFI, leading to more accurate and reliable signal transmission and reception in communication systems, improving overall performance by minimizing interference impacts.
Implementation Method 1
The one or more received signal components are attenuated using a notch filter to reduce RF interference obtained during transmission of the signal over the communication channel
Data Source
AI summary
Rejecting radio frequency (RF) interference in a communication system. In one aspect, rejecting RF interference includes receiving a signal on a signal path of a receiver from a communication channel, the signal including one or more received signal components having a frequency within a predetermined subset range of frequencies within an operating signal bandwidth of the receiver. The received signal components are attenuated using a notch filter to reduce RF interference obtained during transmission of the signal over the communication channel. In some embodiments, the one or more signal components have been boosted in power at a link partner transmitter connected to the communication channel.