In this paper, we examine an orthogonal frequency division multiplexing (OFDM) system under imperfect channel conditions and pilot-insertion- based estimation. However, unlike conventional pilot-insertion-based estimation, some inserted pilot symbols are set to zero where the index of zero-pilot is employed transmit extra data bits. employ a minimum mean squared error (MMSE) detect transmitted ...

Let $C$ be an irreducible smooth complex projective curve of genus $g\geq 2$ and let $C\_d$ its $d$-fold symmetric product. In this paper, we study the question semi-orthogonal decompositions derived category $C\_d$. This entails investigations canonical system on $C\_d$, in particular base locus.

a comparison of buckling analysis of the nanoplate and nanocomposite plate with central square hole embedded in winkler foundation is presented in this article. in order to enhance mechanical properties of nanoplate with central cut out, carbon nano tubes (cnts) are applied as uniform distribution (ud) through thickness direction. in order to define the shape function of plate with square cut o...

orthogonal frequency division multiplexing (ofdm) has become a promising method for many wireless communication applications. however, one main drawback of ofdm systems is the high peak-to-average power ratio (papr). selected mapping (slm) is a well-known technique to decrease the problem of high papr in ofdm systems. in this method, transmitter is obliged to send some bits named side informati...

this study focused on the optimization of al—mg to cuzn34 friction stir lap welding (fslw) process for optimal combination of rotational and traverse speeds in order to yield favorable fracture load using grey relational analysis (gra). first, the degree of freedom was calculated for the system. then, the experiments based on the target values and number of considered levels, corresponding orth...