نتایج جستجو برای: communication system
تعداد نتایج: 2469821 فیلتر نتایج به سال:
a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...
a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...
the purpose of the present study was to investigate the relationship between fear of negative evaluation (fne) and communication strategies (css) among iranian efl learners. it was aimed to examine the differences in the use of communication strategies between speakers with high or low degree of fear of negative evaluation. the current study was a case study consisting of 10 english learners at...
cette étude tente d’étudier et de comprendre le rôle que joue l’empathie en enseignement. lempathie y est observée en tant que modèle de communication entre l’enseignant et l’élève. de façon générale, lempathie permet dassouplir les échanges entre les personnes. dans un contexte éducatif, la qualité de la communication est associée à un vécu relationnel plus harmonieux et à un meilleur climat d...
after 1860’s the railway systems has started to be used in urban transportation in the world. however, especially after the 1950’s, automobile usage has been increased quickly. thus the dense of transportation has started to move from railway systems to the ones with rubber tire vehicles in istanbul. traffic density in urban transportation has started to be experienced since 1950 with the incre...
introduction: development. it is a lifelong condition, with symptom that appears in early childhood. these people have problem in social skills, communicating with others and expressing their feelings. these people specially have difficulties with the surrounding world and recognizing objects. one of the most effective methods in educating the autistic children is “picture exchange communicatio...
In this paper, an enhancement design of communication system using optical radio frequency (RF) waves in free space optical communication (FSO) system is presented. To our knowledge, it is the first time that the effect of Gamma-Gamma turbulent channel model on the performance of the proposed system is analyzed and simulated. To obtain an optical communication system with good performance and h...
Many researches show that approximately 50 percent of all autistic children never acquire functional speech. Using Augmentative and Alternative communication System (AAC) is necessary for these children. The Picture Exchange Communication system (PECS) is a communication program that has become widely used, especially with children with autism. This paper, reports the results of a review of the...
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