OFDM Electromagnetic Leakage Shielding Signal Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional technologies face challenges in effectively blocking electromagnetic leakage across the entire broadband frequency range of 1 GHz or less, leading to increased equipment complexity and limited frequency suppression, while allowing authorized communication.
Innovation Solution
An apparatus and method that generate an electromagnetic leakage shielding signal using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, with a shielding signal pattern including radiation and suppression bands, amplified by a signal amplification unit and transmitted via an antenna, allowing for flexible frequency settings and efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional technologies use hardware notch filter to block electromagnetic leakage, then frequency suppression is achieved, but device complexity and equipment size increase
Solution Approach 1:
The patent replaces hardware notch filters (mechanical/electrical filtering components) with software-based OFDM signal processing. The shielding signal is generated through digital signal processing and transmitted via antenna, eliminating the need for complex hardware filtering circuits while achieving effective electromagnetic leakage blocking across broadband frequency ranges.
Solution Approach 2:
The OFDM-based shielding signal generation system serves multiple functions: it blocks electromagnetic leakage across broadband frequencies, allows flexible frequency band selection through software configuration, and enables authorized communication by permitting specific frequency bands. This multi-functionality replaces multiple separate hardware components with a single versatile system.
2Object-affected harmful factors
If hardware notch filter is used to block electromagnetic leakage, then frequency suppression is achieved, but the frequency range that can be suppressed is extremely limited
Solution Approach 1:
The patent enables dynamic adjustment of frequency parameters through software configuration. The OFDM shielding signal can be generated with different subcarrier frequencies, bandwidths, and spectral masks to adapt to various frequency ranges. This allows the system to suppress electromagnetic leakage across the entire 1 GHz broadband frequency range and adapt to changing communication environments without hardware modifications.
3Object-affected harmful factors
If conventional technologies attempt to block all frequency bands, then electromagnetic leakage is reduced, but authorized communication is also blocked
Solution Approach 1:
The patent applies frequency-selective shielding by configuring specific subcarriers in the OFDM spectrum to generate shielding signals only in frequency bands where electromagnetic leakage occurs. Authorized communication frequency bands are excluded from shielding signal generation, allowing local (frequency-specific) blocking while preserving communication capabilities in other bands.
Data Source
AI summary
An apparatus and a method for preventing an information leakage. The apparatus for preventing the information leakage includes a shielding signal pattern generation unit configured to generate a shielding signal pattern including a radiation band and a radiation suppression band; a shielding signal generation unit configured to generate an electromagnetic leakage shielding signal corresponding to an Orthogonal Frequency Division Multiplexing (OFDM) scheme by using the shielding signal pattern; a signal amplification unit configured to amplify a transmitting power of the electromagnetic leakage shielding signal; and an antenna unit configured to transmit the amplified electromagnetic leakage shielding signal.