Search

The concept of secrecy capacity per unit cost was introduced in the study of cost-efficient secure wide-band communications. It has been established that for a degraded memoryless wiretap channel, a structured orthogonal code achieves the secrecy capacity per unit cost. In this paper, we consider a memoryless wiretap channel with channel state, where the state is available non-causally to the transmitter as side information. Under the assumption of the existence of a zero cost input “0”, it is shown that a lower bound on the secrecy capacity per unit cost for such a channel can be achieved using a nested orthogonal random binning coding scheme.

This paper introduces a design of a three-phase flux switching machine (FSM), which is mainly designed for a 400 HZ aircraft auxiliary power unit. In this design, there are two winding sets embedded in the stator slots. One, is referred to as three phase armature windings, supply the power to the aircraft electrical system. The other winding, namely excitation winding, is fed from a dc supply. Also, a slotted rotor will be designed without any winding or permanent magnets. Moving the field winding to the stator not only ensures brushless construction, but also reduces generator weight through the direct coupling between the generator and the gas turbine. The machine is initially simulated using 2-D finite element analysis (FEA) and its performance is analyzed. Additionally, a prototype is implemented, and its performance is practically measured in order to prove the validity of the proposed machine for aircraft auxiliary power units.

Amyotrophic lateral sclerosis (ALS) is a paralytic disorder that affects muscles by weakening them, until reaching a certain stage of immobility, where the patient could only move his/her eyes. ALS-inflicted victims have been increasing over the past few years with no cure to be found. This has lead to a proliferation of special-aid gadgets, which are tailored to improve the life conditions of those patients. This paper proposes a cost-efficient prototype for an intelligent aid-vehicle that works by interpreting the blinking movements of the ALS patient's eyes. The aid-vehicle is equipped with a pad that controls the motion of the motors, a virtual keyboard that can be used to type its user's thoughts via eye movement and blinking, and several sensors that aid to stop the vehicle whenever an obstacle is detected. The aid-vehicle is designed to be used indoors and outdoors. It is user-friendly, easy to manipulate, and offers ALS patients a mean to be less dependent on others, and a way to communicate with the outside world at an affordable price, with the hope that it would contribute to the longevity of ALS patients.

Perfect security for the multi-antenna wiretap channel is considered, at the physical layer, under a limited-energy constraint. The problem was originally considered in [1] for point-to-point channels, where the fundamental limits of secure communication have been established in the wideband regime. In this paper, the more general multi-antenna scenario is addressed. The main result proves that the secrecy capacity per unit cost (energy), under the mild condition of zero-cost input letter, can be achieved using a structured orthogonal random binning coding scheme.

This paper proposes a signal classification technique that is able to differentiate between TV signals and other secondary signals that might be using the licensed TV channels. The main contribution of this work is to combine the results of two, existing, sensing algorithms, Energy Detection Method and Correlation Based Method using a Fuzzy Inference Fusion system to decide whether the sensed signal-if any-is a licensed (TV) signal or an unlicensed signal. This work shows capability of signal classification in case of analog TV signal (PAL) and digital TV signal (DVB-T). Performance evaluation of the proposed approach using MATLAB has proven accurate classification capability at relatively low Signal to Noise Ratio.

Two main ingredients that enable wiretap codes to achieve information-theoretic secrecy are their binning structure and the randomization among multiple codewords. The presence of an infinite amount of randomness is an oversimplifying assumption which act as a hurdle that prevents the development of practical codes for wiretap channels. In this paper, we investigate the trade-off between the achievable secrecy rate and the randomness rate for wiretap channels with side information, non-causally known to the transmitter. Using the linear deterministic approach, we present insights into finding near-optimal codes under limited randomness.

In a smart grid environment some customers employ third-party meters and terminals for integrity verification of the smart meter power measurements reported by the electric utility company. We address the security issues that may arise under the presence of a third-party wireless terminal. In this paper we consider a rate-distortion perspective that contrasts the Slepian-Wolf distortionless coding approach recently presented by Varodayan and Gao [1] for integrity verification through redundant metering. We show that through the use of a limited secret key, we can impose a certain minimum distortion on the eavesdropper, while enabling the wireless terminal to retrieve the measurements losslessly with high probability. We highlight the advantages of our approach.

In this paper, a modified backstepping approach will be developed and applied to control unmanned areial vehicles (UAVs), Quadrotor. In this modified backstepping approach, the number of control parameters is reduced by half compared with the classical back stepping approach used in the literature. Simulation is used to test the stability of the overall nonlinear Quadrotor system and compared with the classical one.

Recently there has been a lot of success in using the deterministic approach to provide approximate characterization of Gaussian network capacity. In this paper, we take a deterministic view and revisit the problem of wiretap channel with side information. A precise characterization of the secrecy capacity is obtained for a linear deterministic model, which naturally suggests a coding scheme which we show to achieve the secrecy capacity of the degraded Gaussian model (dubbed as "secret writing on dirty paper") to within half a bit., Removed the section on writing on fading paper; improved the gap result from $(1/2)\log3$ bits to half a bit; added a section on secret-key agreement via dirty-paper coding; revised version submitted to the IEEE Transaction on Information Theory

The concept of channel capacity per unit cost was introduced by Verdu in 1990 to study the limits of wideband communication. It was shown that an orthogonal coding scheme achieves the channel capacity per unit cost of memoryless stationary channels with a zero-cost input letter. This paper introduces the concept of secrecy capacity per unit cost to study wideband secrecy communications. For degraded memoryless stationary wiretap channels, it is shown that an orthogonal coding scheme achieves the secrecy capacity per unit cost with a zero-cost input letter. For general memoryless stationary wiretap channels, the performance of orthogonal codes is studied and lower and upper bounds on the secrecy capacity per unit cost are provided.