Signal Detection and Jammer Localization in Multipath Channels for Frequency Hopping Communications

Abstract

Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Frequency hopping is the prevailing spread spectrum method in military communications, largely due to its low probability of detection and interception. In this project we developed a novel signal processing scheme for code-blind reception of multiple frequency hopped transmission over multipath channels. This techniques is based on the principle of dynamic programming and/or expectation-maximization, coupled with multidimensional harmonic and low rank analysis. It is able to jointly estimate hop timing, hop frequency, and directions of multiple frequency hopped signals in the presence of frequency collisions, without the knowledge of signal hop patterns. The method can also be used to obtain locate information and operation characteristic of active frequency hopped jammers. The associated identifiability of 2-D frequency estimation is also studied.

Online Hop Timing Detection and Frequency Estimation of Multiple FH Signals

“…It is obvious in (14) that the posterior distribution is a normal received, a new group of particles should be generated to fit the new posterior distribution. Since the newly collected snapshot depends on the same FDP as the t h −1 snapshots, no directional sampling method, such as importance sampling [17], is needed.…”

“…To deal with the problem of parameter estimation of combined synchronous or asynchronous FH signal and network sorting, researchers have resorted to the multiple-antenna systems. Liu and others were the first researchers to use antenna arrays for multiple FH signal parameter estimation [9]- [14]. In [9], they first separated the FH signals via spatial filtering and then used the dynamic programming method to estimate the hop times and frequencies from the separated data.…”

“…The researchers in [10]- [13] studied the parameter estimation of multiple FH signals in expanded cases, such as multipath, two-dimensional arrays, frequency collision, receiver bandwidth mismatches, and so on. Liu's work on these methods was completed in [14].…”

Jammer Location-Oriented Noise Node Elimination Method for MHWN

“…As the feasible framework to achieve the connection between universal networks in complex network environment, Multi-Hop Wireless Network (MHWN) has become a focus in academic and industry circles in recent years. However, the shared nature of wireless communication, the open access to wireless medium and the selforganized network composition make MHWN vulnerable to various network attacks, including schemes require the wireless device to be equipped with specialized hardware, e.g., ultrasound or infrared, or utilize signals transmitted from wireless devices to perform localization (Jin & Wu, 2014;Liu & Xiangqian, 2005;Hou, Jing & Yang, 2014). This will bring much extra cost to the network.…”

Lightweight Jammer Localization in Wireless Networks: System Design and Implementation

“…RELATED STUDIES Signal processing localization techniques: Secure mobile device localization, and in particular jammer localization, has been studied in the literature during the past years. Various approaches have been proposed in order to locate the malicious device, such as the efforts in [10], [11], [12], [13], [14]. However, all of these studies use advanced signal processing techniques and operate at the PHY layer.…”