Wireless network jamming techniques are commonly used in both military and commercial applications to block communication between network devices.  Denial-Of-Service techniques (e.g. continuous jamming) are frequently employed but suffer drawbacks including high power consumption and high probability of detection.  Reactive Jamming techniques have been considered more recently. These techniques offer the potential for greater power efficiency and lower probability of detection; however, these benefits have not been realized because of implementation challenges associated with real-time constraints. 

Recognizing the deficiencies of existing systems, a team of Drexel researchers have developed a software defined radio (SDR) frame-work for real-time reactive adversarial jamming in wireless networks. The system consists of detection and RF response infrastructure, implemented in the FPGA of a USRP N210 and designed to function with the open source GNU Radio SDR library. The framework can be used to implement a fast turnaround reactive jamming system capable of timely RF response within 80 ns of signal detection. The framework also allows for full control and feedback from FPGA hardware to the GNU Radio-based cognitive radio backend, making it applicable to a wide range of preamble- based wireless communication schemes. Results indicate that the system works reliably in real time as a reactive jammer and can be used as a research instrument for practical assessments of modern jamming and secure communication techniques.