Secure communication in cooperative networks using cooperative jamming techniques

Download

index.pdf

Date

2014

Author

Erkan, Kerem

Metadata

Show full item record

Item Usage Stats

138
views

52
downloads

In cooperative communication, a source communicates with a destination over indirect links through relays. Like most wireless systems, cooperative networks seriously suffer from secrecy related issues. In this thesis, cooperative jamming method is utilized to provide secrecy for cooperative networks in which there exist adversary receivers called eavesdroppers. The main idea is to broadcast noise signals from a selected relay to corrupt the signal-to-interference-plus-noise ratio (SINR) at eavesdroppers when the transmitter communicates with the receiver through another selected relay. Throughout the study, it is assumed that channel state information (CSI) of the links between the source, relays and the destination is available at the transmit and receive sides of links. Rich scattering channels are assumed and all channel gains are taken as independent. In contrast to the past studies in the literature, CSI of eavesdroppers’ channels exist at only themselves since they are accepted as passive devices in this study. The knowledge on channel gains except eavesdroppers’ ones are used to adaptively select the relays to support cooperative jamming. Cooperative jamming is investigated here from an outage probability perspective where probability of secure transmission is the parameter of interest for a fixed transmission rate. First, cooperative jamming is applied to cooperative networks with single-antenna nodes. The probability of secure communication increases to a degree for a range of the communication rate R with cooperative jamming and adaptive selection of relays. The results are generally encouraging, but may be insufficient for real-world cooperative networks. Second, cooperative jamming is implemented at cooperative networks with multiple-antenna nodes to increase the probability of secure communication benefiting from advantages of multiple antennas. Adaptive transmit precoding is applied at the source and the communicating relay to enhance the SINR at legitimate receivers. This advantage brings an edge over eavesdroppers. Moreover, adaptive noise generation is proposed at the noise emitting relays in order to minimize the effect of noise at legitimate receivers. It is shown that the probability of secure communication dramatically rises with these adaptive techniques. As a result, there is a certain transmission rate R at which the source is able to securely communicate with the destination with probability approaching one.

Subject Keywords

Telecommunication, Computer networks, Scrambling systems (Telecommunication)., Noise generators (Electronics).

URI

http://etd.lib.metu.edu.tr/upload/12616848/index.pdf
https://hdl.handle.net/11511/23320

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Multi-layer network design problems in telecommunication Yüksel Ergün, İnci; Kırca, Ömer; Süral, Haldun; Department of Industrial Engineering (2013) The telecommunication network design problem is to configure a telecommunication network of major hardware and their links in order to satisfy traffic demands and flows subject to a set of constraints arising from topology, capacity, and technology. Telecommunication network design has been studied in several disciplines and its literature is intricate. In this study, we classify the telecommunication network design problems in the literature from the perspective of operations research and review the networ...
Opportunistic multiple relaying in wireless ad hoc networks Yenihayat, Güven; Yılmaz, Ali Özgür; Department of Electrical and Electronics Engineering (2011) Cooperative relaying systems aim to improve weak communication links by exploiting the spatial diversity obtained by the statistically independent channels between relays and the destination. In this thesis a cooperative relaying scheme called the Opportunistic Multiple Relaying (OMR) is proposed with its special receiver structure. Unlike most relaying schemes in the literature, multiple relay nodes are allowed to transmit in nonorthogonal channels in OMR without requiring any control overhead for relay co...
Cooperative Communications in Future Home Networks Genc, Zulkuf; Rizvi, Umar H.; Onur, Ertan; Niemegeers, Ignas (Springer Science and Business Media LLC, 2010-05-01) The basic idea behind cooperative communications is that mobile terminals collaborate to send data to each other. This effectively adds diversity in the system and improves the overall performance. In this paper, we investigate the potential gains of cooperative communication in future home networks. We derive analytical expressions for the error probability of binary phase shift keying (BPSK) signals over Nakagami-m fading channels in a multi relay communication network. Following to the analytical study, ...
Chaotic digital modulation and demodulation Öztürk, Uygar; Demirbaş, Kerim; Department of Electrical and Electronics Engineering (2005) This thesis considers a communication system with chaotic modulation. Noise-like signals are generated by chaotic systems with different parameters to modulate binary digital signals. Demodulation is performed by both the Extended Kalman Filter (EKF) and Optimum Decoding Based Smoothing Algorithm (ODSA). Simulations are performed using both of these algorithms for different parameters affecting the performance of the communication system. Simulation results of these algorithms are compared.
Noncoherent differential demodulation of CPM signals with joint frequency offset and symbol timing estimation Çulha, Onur; Tanık, Yalçın; Department of Electrical and Electronics Engineering (2011) In this thesis, noncoherent differential demodulation of CPM signals with joint carrier frequency offset and symbol timing estimation is investigated. CPM is very attractive for wireless communications owing to major properties: good spectral efficiency and a constant envelope property. In order to demodulate the received CPM signal differentially, the symbol timing and the carrier frequency offset have to be estimated accurately. There are numerous methods developed for the purpose. However, we have not en...

Citation Formats

K. Erkan, “Secure communication in cooperative networks using cooperative jamming techniques,” M.S. - Master of Science, Middle East Technical University, 2014.