This paper presents a new method to improve on block spread OFDM by exploiting time diversity to ensure that the blocks are independent and uncorrelated. Simulation results have shown significant improvement over conventional OFDM and Block Spread OFDM. Disciplines Physical Sciences and Mathematics Publication Details Raad, I. S. & Huang, X. (2006). Exploiting time diversity to improve block sp...

Passive forensics analysis aims to find out how multimedia data is acquired and processed without relying on pre-embedded or preregistered information. Since most existing compression schemes for digital images are based on block processing, one of the fundamental steps for subsequent forensics analysis is to detect the presence of block artifacts and estimate the block size for a given image. ...

introduction: pain control is the most important issue in emergency department management of patients with femoral bone fractures. the present study aimed to compare the procedural features of ultrasonography and nerve stimulator guided femoral nerve block in this regard. method: in this randomized clinical trial, patients with proximal femoral fractures presenting to emergency department were ...

In this paper, we propose a systematic search method for finding the impossible differential characteristic for block cipher structures, better than the U-method introduced by Kim et al [6]. This method is referred as unified impossible differential (UID) cryptanalysis. We give practical UID cryptanalysis on some popular block ciphers and give the detailed impossible differential characteristic...

In this paper, the numerical technique based on hybrid Bernoulli and Block-Pulse functions has been developed to approximate the solution of system of linear Volterra integral equations. System of Volterra integral equations arose in many physical problems such as elastodynamic, quasi-static visco-elasticity and magneto-electro-elastic dynamic problems. These functions are formed by the hybridi...