Index Terms—intensity modulation with direct detection (IM/DD), asymmetrically clipped orthogonal frequency division multiplexing (ACO-OFDM), optical communication.

Forty years ago Schaer and Wetzel showed that a $\frac{1}{\pi}\times\frac {1}{2\pi}\sqrt{\pi^{2}-4}$ rectangle, whose area is about $0.122\,74,$ is the smallest rectangle that is a cover for the family of all closed unit arcs. More recently F\"{u}redi and Wetzel showed that one corner of this rectangle can be clipped to form a pentagonal cover having area $0.11224$ for this family of curves. He...

To utilize the full potential of new high dynamic range (HDR) displays, a system for the enhancement of bright luminous objects in video sequences is proposed. The system classifies clipped (saturated) regions as lights, reflections or diffuse surfaces using a semi-automatic classifier and then enhances each class of objects with respect to its relative brightness. The enhancement algorithm can...

OFDM transmission in optical wireless channel is established via asymmetrically clipped optical OFDM (ACO-OFDM). Clipping is one of the simplest methods to reduce the high peak to average power ratio (PAPR). Clipping leads to additional in-band distortion and out-of band distortion. In this paper it is proposed to mitigate the clipping noise by iterative reconstruction based method and Channel ...

Most learning algorithms are not invariant to the scale of the signal that is being approximated. We propose to adaptively normalize the targets used in the learning updates. This is important in value-based reinforcement learning, where the magnitude of appropriate value approximations can change over time when we update the policy of behavior. Our main motivation is prior work on learning to ...

We consider the mesh refinement problem in the kinetic setting: given an input set of moving points, the objective is to design a kinetic data structure (KDS) for inserting additional so-called Steiner points so that the resulting output set yields a quality triangulation. Therefore, the selection of Steiner points plays a cruicial role, both in terms of the output itself and the quality of the...

A major problem with multicarrier transmissions is the near Gaussian behavior of the data stream entering the High Power Ampli er (HPA). This causes distortion (some samples are clipped) that must be corrected at the transmit or receive end, in order to improve detection performance. In this paper, we propose a new approach that recovers the distorted samples at the receiver. It is based on an ...

where sgn(x) stands for the sign of x. We first present and prove two useful lemmas about the unpenalized weighted Wilcoxon estimator under possible local contamination. These results will be useful later to establish the asymptotic properties of the penalized Wilcoxon estimator. In the proof of the two lemmas, we frequently refer to the book of Hettmansperger and McKean (1998), abbreviated as ...

LUKEN, J. O. (Department of Biology, Coastal Carolina University, Conway, SC 29528). Performance of Dionaea muscipula as influenced by developing vegetation. J. Torrey Bot. Soc. 134: 45–52. 2007.— Demography, growth, and flowering of Dionaea muscipula (Venus’ fly trap) were studied during three years (2003–2005) following prescribed fire. Data were collected in permanent quadrats where the deve...

semi-active base isolation system has been proposed mainly to mitigate the base drift of isolated structures while in most cases, its application causes the maximum acceleration of superstructure to be increased. in this paper, designing optimal semi-active base isolation system composed of linear base isolation system with low damping and magneto-rheological (mr) damper has been studied for co...