We consider a cooperative relaying system which consists of a number of source terminals, one shared relay, and a common destination with multi-packet reception (MPR) capability. In this paper, we study the stability and delay analysis for two cooperative relaying schemes; the sensing-based cooperative (SBC) scheme and the decision-based cooperative (DBC) scheme. In the SBC scheme, the relay se...

This paper studies the resource allocation problem when multiple jammers follow aircraft formation to support ground penetration. A joint optimization method of multi-jammer beam-power based on improved artificial bee colony (IABC) algorithm is proposed. The air-to-ground “many-to-many” assault cooperative suppression jamming model given. constant false alarm probability detection networked rad...

Title of dissertation: ALIGNMENT AND COOPERATION FOR SECRECY IN MULTI-USER CHANNELS Raef Bassily Doctor of Philosophy, 2011 Dissertation directed by: Professor Şennur Ulukuş Department of Electrical and Computer Engineering The study of the physical layer has offered a new perspective to the problem of communication security. This led to the development of a vast set of ideas and techniques roo...

Cooperative communication is an attractive solution to combat fading in wireless communication systems. Achieving synchronization is a fundamental requirement in such systems. In cooperative networks, multiple single antenna relay terminals receive and cooperatively transmit the source information to the destination. The multiple distributed nodes, each with its own local oscillator, give rise ...

Signal evolution in social animals has produced a wide variety of communal displays, many of them remarkable feats of complex coordination. The two main explanations for this temporal precision are: (1) it evolves as a cooperative signal of coalition quality or (2) it minimizes signal jamming (i.e., interference of one signal by another). However, support for the first hypothesis is inconclusiv...

We investigate the secure degrees of freedom (SDoF) of a two-transmitter Gaussian multiple access channel with multiple antennas at the transmitters, a legitimate receiver and an unknown number of eavesdroppers each with a number of antennas less than or equal to a known value NE . The channel matrices between the legitimate transmitters and the receiver are available everywhere, while the legi...

Extended Abstract: Cooperative communication is now widely known as a promising technique for realizing distributed spatial diversity in modern wireless networks. To achieve various performance advantages benefiting from user cooperation, knowledge of the system parameters at the relay and destination terminals is typically required. For example, to implement the distributed beamforming/precodi...

We determine the exact sum secure degrees of freedom (d.o.f.) of the K -user Gaussian interference channel. We consider three different secrecy constraints: 1) K -user interference channel with one external eavesdropper (IC-EE); 2) K -user interference channel with confidential messages (IC-CM); and 3) K -user interference channel with confidential messages and one external eavesdropper (IC-CM-...

In this paper, we propose a Cooperative Transmission Strategy using Entropy-based Relay Selection in Mobile Ad-hoc Wireless Sensor Networks (MAWSN) with Rayleigh Fading Environments. The main features and contributions of the proposed cooperative transmission strategy are as follows. First, entropy-based relay selection is used to improve data transmission reliability from a source node to a de...