Impact of Noise Power Uncertainty on the Performance of Wideband Spectrum Segmentation

The objective of this work is to investigate the impact of noise uncertainty on the performance of a wideband spectrum segmentation technique. We define metrics to quantify the degradation due to noise uncertainty and evaluate the performance using simulations. Our simulation results show that the noise uncertainty has detrimental effects especially for low SNR users

On the Practicality of UHF RFID Fingerprinting: How Real is the RFID Tracking Problem?

Abstract. In this work, we demonstrate the practicality of people tracking by means of physical-layer fingerprints of RFID tags that they carry. We build a portable low-cost USRP-based RFID fingerprinter and we show, over a set of 210 EPC C1G2 tags, that this fingerprinter enables reliable identification of in-dividual tags from varying distances and across different tag placements (wallet, shopping bag, etc.). We further investigate the use of this setup for clandestine people tracking in an example Shopping Mall scenario and show that in this sce-nario the mobility traces of people can be reconstructed with a high accuracy

LTE for Public Safety Networks: Synchronization in the Presence of Jamming

In this paper, an algorithm for timing synchronization, cell identity detection, and carrier frequency offset (CFO) estimation is presented for long-term evolution (LTE) systems. The proposed algorithm is robust against partial-band interference and/or jamming. It utilizes adaptive filtering to suppress the contribution of the jamming signal to the timing detection metric without using any a priori knowledge of the jamming signal characteristics. The timing detection metric is computed by minimizing the output of the adaptive filter corresponding to any received signal that does not match the signature of the LTE primary synchronization signals (PSS). The filter coefficients are updated iteratively using the recursive least squares algorithm. The frequency response of the adaptive filter at the PSS detection instant is used to weight the contribution of different subcarriers to the metrics used in cell identity detection and CFO estimation. Simulation results are presented show

Towards Physical-Layer Authentication for Backscatter Devices : Extended Abstract

Backscatter communications relieves sensor tags from the energy-intensive task of generating their own radio waves. This enables sensor tags to transmit their sensor readings at an energy consumption that is several orders of magnitude lower than that of conventional low-power radios. The resource-constraints of typical backscatter tags, however, make it challenging to provide security for them. In this extended abstract, we take a first step towards authentication of backscatter transmissions. We propose to add authentication information in the chip sequences of the physical layer. We discuss design issues and in particular the trade-off between security and reliability and propose mechanisms to enable low-power authentication suitable for backscatter tags

The oxidation behaviour of sintered iron

SIGLEAvailable from British Library Document Supply Centre- DSC:DX95560 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

patient-based survey

Although gout is potentially curable, the management of this disease is often suboptimal. In this study, we investigated the treatment of gout in Turkey and also compared the management approaches to gout in different clinical specialties. Three hundred and nineteen consecutive patients (mean age 58.60 +/- 12.8 years; 44 females, 275 males) were included in this multicenter study. A standardized form was generated to collect data about the patient's first admission to health care, the specialty of the doctor first diagnosed the gout, the treatment options for gout including attack management, patient referral, chronic treatment including medical treatment, and life style modifications. Forty patients were referred to another center without any treatment (12.8 %), and referral rate is most common among the primary care physicians (28.8 %). Colchicine was more commonly used for attack prophylaxis than allopurinol. Ninety-two patients had never been treated with allopurinol (28.8 %). Allopurinol prescription was less common among the primary care physicians and orthopedists, and highest among the rheumatologists. Recommendation of diet and life style modifications was less common among the primary care physicians and orthopedists, and highest among the rheumatologists. The rates of life style modification recommendation and long-term allopurinol prescription were 83.7 and 77.6 %, respectively, among the rheumatologists. Both acute and chronic management of gout is suboptimal in Turkey especially among the primary care physicians and orthopedists. Moreover, chronic treatment is even suboptimal among rheumatologists