Wireless Jamming via Downlink Signal Delay
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Solution Overview
Problem
Existing wireless communication jammers face inefficiencies and reliability issues due to their inability to effectively jam spread spectrum signals like CDMA and WCDMA, and they either lack specificity, are costly, or have high complexity and power consumption.
Innovation Solution
A jamming system that generates a jamming signal derived from the downlink signal with a time delay, using a band pass filter and a delay device like single mode fiber optic cable to create a more effective and efficient jamming signal, reducing power consumption and complexity while being self-adjusting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barrage type jamming is used to cover entire frequency band, then jamming effectiveness is maintained over time, but power amplifier heating increases and efficiency decreases
Solution Approach 1:
The patent applies local quality by capturing the downlink signal at specific locations and retransmitting it with delay to create targeted jamming effects. Instead of uniformly jamming the entire frequency band, the system focuses jamming energy on specific uplink frequencies affected by the delayed downlink signal, thereby reducing overall power consumption while maintaining effectiveness.
Solution Approach 2:
The patent changes the temporal parameter of the jamming signal by introducing a delay of 0.5-2 seconds between capturing the downlink signal and retransmitting it. This parameter change creates a feedback loop that disrupts uplink communications without requiring continuous high-power transmission across the entire band, thus reducing power amplifier heating.
2Power
If frequency specific jamming is used to target exact frequencies, then output power at target frequencies increases, but system complexity and cost increase due to pre-programming requirements
Solution Approach 1:
The patent implements self-service by automatically capturing downlink signals and retransmitting them with delay without requiring manual frequency configuration. The system adapts to frequency changes autonomously, eliminating the need for pre-programming and complex signal generation circuitry while maintaining focused jamming power at the required frequencies.
Solution Approach 2:
The patent uses copying by capturing the actual downlink signal and retransmitting it after delay, rather than generating synthetic jamming signals. This approach simplifies the signal generation circuitry while ensuring the jamming signal exactly matches the frequencies being used by the target communication system.
3Loss of energy
If reactive type jamming is used to detect target signal first, then power amplifier efficiency increases, but response delay reduces effectiveness against short burst communications
Solution Approach 1:
The patent applies preliminary action by continuously capturing and buffering the downlink signal in advance, so that when uplink communication occurs, the delayed retransmission immediately disrupts it. This eliminates detection delay because the system is already prepared with the jamming signal source, enabling instantaneous response to short burst communications.
4Productivity
If spread spectrum technology like CDMA and WCDMA is used for wireless communication, then spectral efficiency increases, but susceptibility to traditional jamming decreases
Solution Approach 1:
The patent uses feedback by capturing the downlink signal that has already been modulated with spread spectrum technology and retransmitting it with delay. This feedback mechanism ensures the jamming signal exactly matches the spread spectrum waveform, making traditional frequency-specific or barrage jamming ineffective while maintaining high spectral efficiency of the target system.
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
The system achieves 15 to 25 dB more effective jamming than barrage type jammers and 10 to 15 dB more than frequency specific jammers, with lower electrical circuit complexity, higher reliability, and instantaneous response to short burst communications, while requiring less power and disrupting fewer non-target communications.
Implementation Method 1
using a band pass filter and a delay device like single mode fiber optic cable to create a more effective and efficient jamming signal
Data Source
AI summary
A device and method for jamming wireless communication devices where the jamming signal is derived from the downlink signal of the base station and processed with a time delay sufficient length as to prevent the base station receiver from correctly processing the responding uplink signal from the targeted wireless communications device. Such wireless communication jamming device can be used by law enforcement and authorized government entities to block the operation of wireless communication devices such as cell phones within a target area.