Secure Communications System Through Concurrent AJ and LPD Evaluation

Abstract

In this paper, a systematic approach and their corresponding metrics for concurrent anti-jamming (AJ) and low probability of detection (LPD) performance evaluations of a secure communications system are investigated. In general, it is necessary to deal simultaneously with adversary threats of both active jamming and passive detection for a secure communications system concern. For independent or concurrent AJ and LPD performance evaluations, a single varying paired and multiple paired fixed collocated jammers/interceptors scenario is explored with real sinc type (sin(x)/x) antenna patterns being considered for the communicators. The error probability with both AJ and LPD being considered simultaneously can be derived as system-and geometry-dependent factors and categorized as system metrics related to jammers, interceptors, and communicators themselves only. Whenever multiple collocated jammers/interceptors are considered, we can observe interesting "smoothed" effects for bit energy to jamming density ratio (E b /J o ), when one of these varying jammers/interceptors is approaching or receding. In addition, by means of these system metrics, it is intuitive and straightforward to enhance system performance for the victim or to deteriorate system performance for the adversary, respectively. Moreover, the proposed approach and metrics have also paved one practical way for the developments of the latest emphasized cognitive radio (CR) communications systems, if all the collocated jammers/interceptors on the proposed scenario are replaced with "cooperative" communicators.

Physical Layer Security for RF Satellite Channels in the Finite-Length Regime

“…at modulation ("waveform") level. LPI and LPD waveforms [32][33] [34] along with signal processing and channel coding techniques [35] are highly effective against jamming attacks and interception. Early studies of information-theoretic physical layer security focused on multibeam satellite communications.…”

Adaptation from Transmission Security (TRANSEC) to Cognitive Radio Communication

“…Furthermore, real-time spectrum sweeping characteristics are coordinated together with system parameters in temporal and frequency domains, e.g., scanning rate and framing processing time, for evaluating the performance of CR communications under an elliptical or a hyperbolic operation scenario, which can be applied for radio spectrum sensing and location awareness in cognitive radio communications. The proposed schemes and metrics can pave one practical way for system evaluations of cognitive radio communications (Liao et al, 2009). Although the performance evaluation of cognitive radio (CR) networks is an important problem, it has received limited attention from the CR community.…”