Unsupervised algorithms can be used in digital communications to estimate the channel at the receiver without using pilot symbols, thus obtaining a considerable improvement in terms of data rate, spectral efficiency, and energy consumption. Unfortunately, the computational load is considerably high since they require to estimate Higher Order Statistics. For addressing this issue, it has been re...

Applying spatial mode switching in channel adaptive MIMO systems promises to achieve high spectral efficiencies in practical system setups. Several studies have pointed out significant performance gains obtained in realistically modeled channel scenarios. We have conducted channel measurements with the Berlin LTE-Advanced Testbed operated in the city center of Berlin and used these for the perf...

The recent BICEP2 detection of degree scale CMB B-mode polarization, coupled with a deficit of observed power in large angle temperature anisotropy, suggest that the slow-roll parameter H , the fractional variation in the Hubble rate per efold, is both relatively large and may evolve from an even larger value on scales greater than the horizon at recombination. The relatively large tensor contr...

of average position error, and in the number of frames where the results outper-form the best instantaneous individual method. These result are encouraging. Acknowledgments We would like to thank researchers from the connectionnist and vision mailing list, Prof. for their help, encouragement and discussions, and for providing image sequences. tive importance of these errors, the vehicle size (i...

The present paper focuses on the application of the base station cooperation (BSC) technique in fractional frequency reuse (FFR) networks. Fractional frequency reuse is considered to be a promising scheme for avoiding the inter-cell interference problem in OFDMA cellular systems, such as WiMAX, in which the edge mobile stations (MSs) of adjacent cells use different subchannels for separate tran...

Based on a local spatial/frequency representation,we employ a spectral histogram as a feature statistic for texture classification. The spectral histogram consists of marginal distributions of responses of a bank of filters and encodes implicitly the local structure of images through the filtering stage and the global appearance through the histogram stage. The distance between two spectral his...

Most traditional objective indices don’t distinguish between a real sound and a perceived sound, and therefore, these indices have limitations in regard to the evaluation of the real effect of an algorithm under investigation on the auditory perception of a hearingimpaired person. Though several objective indices, such as perceptual evaluation of speech quality (PESQ) and composite measurements...

The aim of this paper is to share novel paradigm of channel estimation for orthogonal frequency division multiplexing (OFDM) systems. OFDM is used to improve spectral efficiency and spatial diversity in wireless communications systems. This paper provides a review of channel estimation techniques (blind and pilot-aided) and its performance on data-aided channel. After comparison with known tech...

In this paper, we discuss the role of adequate modelling tools in the development of nanoelectronic technology and devices, including both down-the-roadmap Complementary Metal-Oxide-Semiconductor (CMOS) technology and alternative nanodevices. Such tools can enable understanding of the relevant physical mechanisms on the one hand, and performance evaluation and optimization of device structures,...

Temperature inversion is a transistor-level effect that can improve performance when temperature increases. It has largely been ignored in the past because it does not occur in the typical operating region of a processor, but temperature inversion is becoming increasing important in current and future technologies. In this paper, we study temperature inversion’s implications on architecture des...