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Tel Aviv, Israel

Miranda J.F.,Norwegian University of Science and Technology | Gjertsen K.M.,Ceragon | Olavsbraten M.,Norwegian University of Science and Technology
RWW 2012 - Proceedings: 2012 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, PAWR 2012 | Year: 2012

Driving the gate and drain biases as a function of the input power significantly enhances the efficiency of class-A and -AB amplifiers. These functions are described as low-order polynomials in order to limit the bias bandwidth, especially at the drain. This work formulates the optimization of the bias polynomial coefficients as a constrained optimization problem, describing in detail the formulation of the constraints, the structure of the cost function, as well as a relevant linearity measure. Using the random search algorithm within the field of stochastic search optimization, a set of solutions was obtained yielding power added efficiency nearly as high as 50 %, while the linearity was comparable to that of a class-A amplifier. © 2012 IEEE. Source

Bercovich D.,Ceragon | Contreras L.M.,Telefonica | Haddad Y.,Jerusalem College of Technology | Adam A.,Ceragon | Bernardos C.J.,Charles III University of Madrid
Mobile Networks and Applications | Year: 2015

Traditionally microwave backhaul has been configured and operated in a static manner by means of vendor specific management systems. This mode of operation will be difficult to adapt to the new challenges originated by 5G networks. New mechanisms for adaptation and flexibility are required also in this network segment. The usage of a signaled control plane solution (based on OpenFlow) will facilitate the operation and will provide means for automation of actions on the wireless transport network segment. In addition to that, a standard control plane helps to reach the multi-vendor approach reducing complexity and variety of current per-vendor operation. This paper presents the motivation for the introduction of programmability concepts in wireless transport networks and illustrate the applicability of such control plane with two relevant use cases for dynamically controlling wireless transport nodes in 5G networks. Extensions to OpenFlow protocol are also introduced for building Software Defined Wireless Transport Networks (SDWTNs). © 2015 Springer Science+Business Media New York Source

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