Penn State College of Communications

About: Penn State College of Communications is a based out in . It is known for research contribution in the topics: Relay & Cognitive radio. The organization has 2106 authors who have published 2119 publications receiving 24693 citations.

Energy-Efficient Trajectory Design for UAV-Enabled Communication Under Malicious Jamming

Abstract: In this letter, we investigate a UAV-enabled communication system, where a UAV is deployed to communicate with the ground node (GN) in the presence of multiple jammers. We aim to maximize the energy efficiency (EE) of the UAV by optimizing its trajectory, subject to the UAV's mobility constraints. However, the formulated problem is difficult to solve due to the non-convex and fractional form of the objective function. Thus, we propose an iterative algorithm based on successive convex approximation (SCA) technique and Dinkelbach's algorithm to solve it. Numerical results show that the proposed algorithm can strike a better balance between the throughput and energy consumption by the optimized trajectory and thus improve the EE significantly as compared to the benchmark algorithms.

Transformation of a mealy finite-state machine into a moore finite-state machine by splitting internal states

Abstract: The problem of transformation of a Mealy finite-state machine (FSM) into an equivalent Moore FSM is considered. This problem often arises in the practice of engineering design, when one needs to avoid direct dependence of the output values on variations in the input values. The proposed approach uses the operation of splitting of internal states of an FSM and represents the machine as a list of transitions. Experiment results have shown that transformation of Mealy FSM into Moore FSM increases the number of internal states, on the average, by a factor of 1.96 and increases the number of transitions by a factor of 2.05; the cost of realization of Moore FSM using an industrial software package is approximately twice as great as the corresponding cost for a Mealy machine. The up-to-date tendencies of development of minimization methods and Moore FSM synthesis are described.

Microwave photonic filter with multiple independently tunable passbands based on a broadband optical source

Abstract: In this paper, a novel microwave photonic filter (MPF) with multiple independently tunable passbands is proposed. A broadband optical source (BOS) is employed and split by a 1:N coupler into several branches. One branch is directed to a phase modulator which is modulated by a radio frequency signal and the other branches are delayed by optical delay lines (ODLs), respectively. All of these branches are combined by another 1:N coupler and sent to a dispersion compensation fiber which is used to introduce group delay dispersion to the optical signal. At a photodetector, each time-delayed broadband lightwave beating with the sidebands produced by the phase modulator forms a passband of the MPF. By tuning the delay of each broadband lightwave, the center frequency of the passband can be independently tuned. An MPF with two independently tunable passbands is experimentally demonstrated. The two passbands can be tuned from DC to 30 GHz with a 3-dB bandwidth of about 250 MHz. The stability and dynamic range of the MPF are also evaluated. By employing more branches delayed by ODLs, more passbands can be generated.