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Title Performance of Follower Tone Jamming Considering Practical Tracking Parameters against Frequency Hopping Systems
Degree MS
Author Kim Junhui
Advisor Kiseon Kim
Graduation Date 2015.02.25 File
    Date 2017-03-06 10:54

Various jamming techniques have been proposed and analyzed to disrupt frequency hopping spread spectrum (FHSS) communication systems. Against the FHSS communication systems, partial band noise jamming (PBNJ) and partial band multi-tone jamming (BMTJ) are commonly used. The jamming performance of PBNJ and BMTJ is degraded as the spreading bandwidth increases. To overcome the drawback of PBNJ and MTJ, the follower jamming techniques have proposed and extecsively stuided. The follower jamming is defined that the jammer intercept FHSS signal, processes it, and then transmits jamming at the same frequency or frequency band.

In this thesis, we model tracking parameters of follower tone jamming (FTJ) such as tracking bandwidth, tracking frequency error, arrival timing error, tracking success probability against FHBFSK signal. In addition, we introduce different jamming strategies of FTJ against noncoherent FHBFSK systems, and then, come up with the most effective jamming strategy among them. Consequently, the complemmentary channel jamming is the most effective jamming strategy. However, It is difficult to re-track the complementary channel of FHBFSK signal, the adjacent channels jamming and the all-three channels jamming is effective jamming strategies in realistic environments.

Based on the discussion, we investigate the performance of FTJ considering three tracking parameters such as tracking frequency error, arrival timing error, tracking success probability. we also consider two effective jamming strategies such as adjacent channels jamming and all-three channels jamming against noncoherent FHBFSK systems. In order to investigate the performance of FTJ, we set up two scenarios: (1)jamming-to-signal ratio (JSR) is equal to 0dB and (2)JSR is equal to 10dB. In addition, each scenario is separated into two cases: (1) the follower jammer has excelltent tracking performance and (2) the follower jamming has poor tracking performance. As the results of investigation, the all-three channels jamming is robust to tracking frequency error and arrival timing error. The adjacent channels jamming is robust to tracking frequency error but vulnerable to arrival timing error. In addition, we set up target bit error rate (BER) in order to observe required tracking success probability according to jamming environments. We expect that these results are utilized to decide effective jamming strategy according to jamming environments and design the follower tone jammer.

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