Communications Channel Signal Processing for Radiated Emission Reduction
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Solution Overview
Problem
Conventional communications channels emit unwanted electromagnetic radiation due to high-frequency signal components, leading to interference, compliance issues, and inefficiencies in data transmission, particularly as bandwidth increases, and existing solutions like physical shielding and differential signaling are either space-consuming or inadequate.
Innovation Solution
Signal processing at the input and output ends of communications channels to transform and adapt signals, reducing high-frequency energy emission during transmission, and reversing these transformations post-transmission to maintain signal integrity and fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal frequency is increased to achieve higher bandwidth and faster data transmission, then communication speed and bandwidth are improved, but electromagnetic radiation emissions increase causing interference and compliance issues
Solution Approach 1:
The patent applies parameter changes by transforming the signal waveform parameters at the transmitter to reduce high-frequency spectral content. Specifically, the signal processing modifies rise time, amplitude distribution, and frequency spectrum characteristics to minimize radiated emissions while preserving data transmission integrity. This allows high-speed communication without proportionally increasing EM radiation.
Solution Approach 2:
The patent converts the harmful high-frequency signal components into beneficial low-frequency components through signal transformation. By deliberately shaping the signal to have slower transitions and reduced high-frequency content, the system transforms what would be radiative interference into a controlled, lower-energy signal that can still carry the necessary data information.
2Object-generated harmful factors
If physical shielding is used to block electromagnetic radiation, then radiation emissions are reduced, but device size and complexity increase
Solution Approach 1:
The patent replaces the mechanical/physical shielding approach with an electrical/signaling solution. Instead of using physical barriers like shields or enclosures to block EM radiation, the system uses signal processing techniques to prevent the generation of harmful radiative frequencies in the first place. This substitutes a complex mechanical shielding system with simpler electronic signal transformation.
3Object-generated harmful factors
If differential signaling is used to reduce radiation emissions, then electromagnetic interference is reduced, but the number of conductors and system complexity double
Solution Approach 1:
The patent changes the parameters of the single-ended signal to achieve radiation reduction without requiring differential pairs. By modifying the voltage swing, transition timing, and spectral distribution of the signal, the system achieves low radiation emission performance using the same conductor infrastructure, thereby avoiding the doubling of conductor quantity.
4Reliability
If signal processing is applied at both ends of the communication channel, then signal integrity is maintained despite transformation, but processing complexity increases
Solution Approach 1:
The patent applies inverse signal processing at the receiver end to undo the transformations applied at the transmitter. The receiver's processing is essentially the reverse operation of the transmitter's processing, restoring the original signal characteristics. This inversion approach maintains signal integrity while distributing the processing complexity across both ends of the communication channel.
Data Source
AI summary
A communications channel may radiate energy undesirably, for example in the form of electromagnetic radiation, when a communication signal transmits over the communications channel. Processing the signal before and after transmission on the communications channel can reduce the level of radiated energy. Signal processing in advance of transmission over the communications channel can transform the communication signal into a waveform that has a reduced propensity to emit radiated energy during transmission over the communications channel. Exemplary signal transformations can involve applying either frequency-selective or broadband attenuation to the communication signal. Following transmission of the waveform over the communications channel, the original communication signal can be restored via reversing the signal transformation. The reverse transformation can comprise applying frequency-selective gain or broadband gain to the transmitted waveform.