We address the problem of carrier frequency offset (CFO) synchronization in Orthogonal Frequency Division Multiplexing (OFDM) communications systems in the context of frequency-selective fading channels. The mathematic model of OFDM systems with cyclic prefix (CP) and virtual subcarrier is derived. And we propose the shift-invariance CFO estimation algorithm based on DOA-MATRIX method. After th...

The dynamics performance of 4-RR(RR)R parallel mechanism is analyzed by virtual mechanism method and global conditioning index, which includes Jacobian matrix and Hessian matrix in this paper. Furthermore, the performance indices atlas of velocity, acceleration and inertial force are given. When the acceleration performance index is analyzed, kHkkH−1k is compared with kGkkG−1k in order to find ...

Within the framework of chiral perturbation theory with virtual photons and leptons, we present an updated analysis of the pionic beta decay including all electromagnetic contributions of order ep. We discuss the extraction of the Cabibbo–Kobayashi–Maskawa matrix element |Vud| from experimental data. The method employed here is consistent with the analogous treatment of the Kl3 decays and the d...

using virtual social media and networks widely and relations based on electronic communication have transformed political and social activities in recent decades. the current essay aims to review the effects of virtual social media on the field of politics in iran. therefore, this essay propounds the questions: “how has the virtual social media caused transformation on the field of politics in ...

using virtual social media and networks widely and relations based on electronic communication have transformed political and social activities in recent decades. through this, in this essay we are going to review the effects of virtual social media on the field of politics in iran. therefore, this essay propounds the question that how has the virtual social media caused transformation on the f...

Some iterative matrix relations for the geometric, kinematic and dynamic analysis of a Delta parallel robot are established in this paper. The prototype of this manipulator is a three degree of freedom spatial mechanism, which consists of a system of parallel chains. Supposing that the position and the translation motion of the platform are known, an inverse dynamic problem is solved using the ...

In this publication the construction of an automatic algorithm to subtract infrared divergences in real QCD corrections through the Catani-Seymour dipole subtraction method [1] is reported. The resulting computer code has been implemented in the matrix element generator AMEGIC++ [2]. This will allow for the automatic generation of dipole subtraction terms and their integrals over the oneparton ...

Most direction-of-arrival (DOA) estimation approaches for conformal array suffer from high computational complexity, which cause high energy loss for the direction finding system. Thus, a low energy consumption DOA estimation algorithm for conformal array antenna is proposed in this paper. The arbitrary baseline direction finding algorithm is extended to estimate DOA for a conformal array in ul...