In this contribution, we consider the effect of carrier phase jitter on the performance of uplink OFDMA, uplink multicarrier CDMA (MC-CDMA) and uplink multicarrier direct sequence CDMA (MC-DS-CDMA) systems, assuming orthogonal spreading sequences. For this aim, it is proposed, first to consider a small random jitter, then, to model phase jitter by Gaussian and Rayleigh laws. Theoretical express...

The All-Digital Phase-Locked Loop has several advantages when compared with traditional charge-pump based PLL. We will introduce some of its advantages in this paper, showing how they can be used to improve the system’s performance. In addition, performance limitations of the system will be discussed.

This paper describes some aspects of the implementation of our Data Distribution Tool (DDT), which accepts programs written in Fortran77 and obtains alignment and distribution HPF directives for the arrays used in the program. In particular, we describe the phases of the tool which analyze reference patterns in loops, record preferences for alignment and obtain the alignment functions. These fu...

. In this paper, we address the dense-sparse matrix product (DSMP) problem i.e. where the first matrix is dense and the second is sparse. We first present initial versions of loop nest structured algorithms corresponding to the most used sparse matrix storing formats i.e. DNS, CSR, CSC and COO. Afterwards, we derive several versions obtained by applying loop interchange techniques, loop invaria...

In this paper we investigate a unique problem associated with fusing loops within a High Performance Fortran (HPF) program. In particular, we discuss the issue of performing loop fusion in an HPF compiler when compiling Fortran90 array assignment statements for execution on a distributed-memory machine. During compilation of an HPF program, Fortran90 array assignment statements must be scalariz...

A novel equivalent flux sliding-mode observer (SMO) is proposed for dual three-phase interior permanent magnet synchronous motor (DT-IPMSM) drive system in this paper. The DTIPMSM has two sets of Y-connected stator three-phase windings spatially shifted by 30 electrical degrees. In this method, the sensorless drive system employs a flux SMO with soft phase-locked loop method for rotor speed and...

Virtualization technology plays an essential role in resource in modern large data centers while it also causes interference among virtual machines which co-located in common physical machine contending for the shared physical resources. In this paper, we study the performance prediction models in virtualized environment. Unclassified model developed from all types of applications is quite inac...