tutorial‚ QPSK‚ modulation‚ modulator‚ demodulator‚ demodulation May 01‚ 2002 APPLICATION NOTE 686 QPSK modulation demystified Abstract: Readers are presented with step-by-step derivations showing the operation of QPSK modulation and demodulation. The transition from analog communication to digital has advanced the use of QPSK. Euler’s relation is used to assist analysis of multiplication of sine and cosine signals. A SPICE simulation is used to illustrate QPSK modulation of a 1MHz sine
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systems Pulse Modulation Pulse Modulation consists essentially of sampling analog information signals and then converting those samples into discrete pulses and transporting the pulses from a source to a destination over a physical transmission medium. Pulse Modulation is a method of modulation that represents information as a train of pulses‚ wherein one or more characteristics of each pulse change with the input signal’s variation. Methods of Pulse Modulation • Pulse Width Modulation (PWM) •
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Journal of Biomaterials Applications http://jba.sagepub.com/ Modulation of Gene Expression of Rabbit Chondrocytes by Dynamic Compression in Polyurethane Scaffolds with Collagen Gel Encapsulation Peng-Yuan Wang‚ Hsiang-Hong Chow‚ Wei-Bor Tsai and Hsu-Wei Fang J Biomater Appl 2009 23: 347 originally published online 12 August 2008 DOI: 10.1177/0885328208093684 The online version of this article can be found at: http://jba.sagepub.com/content/23/4/347 Published by: http://www.sagepublications
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Hierarchal Modulation 1. Theory Wireless transmission of image and video data in hostile mobile environments necessitates for a system which guarantees the quality of the data using effective error protection while at the same time ensures continues video streaming [1]. Unequal Error Protection is a technique which makes use of the fact that not all data in a video stream is equally important [1]. Based on the study first presented in [2]‚ data can be divided into different categories based on
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Amplitude Modulation and Angle Modulation Abstract— The aim of this document is to improve understanding of amplitude modulation and angle modulation. We have done this by using Lab view. We have shown 4 types of Amplitude Modulation & 2 types of Angle Modulation. Keywords-amplitude modulation (AM)‚ angle modulation‚ double side band modulation (DSB)‚ double sideband suppressed carrier modulation (DSB-SC)‚ double sideband full carrier modulation (DSB-FC)‚ single side band modulation(SSB)‚ phase
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Pulse-Time Modulation In pulse-modulated systems‚ as in an analog system‚ the intelligence may be impressed on the carrier by varying any of its characteristics. In the preceding paragraphs the method of modulating a pulse train by varying its amplitude was discussed. Time characteristics of pulses may also be modulated with intelligence information. Two time characteristics may be affected: (1) the time duration of the pulses‚ referred to as PULSE-DURATION MODULATION (pdm) or PULSE-WIDTH MODULATION
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Quadrature amplitude modulation (QAM) ([pic] /ˈkwɑːm/ or /ˈkæm/ or simply "Q-A-M") is both an analog and a digital modulation scheme. It conveys two analog message signals‚ or two digital bit streams‚ by changing (modulating) the amplitudes of two carrier waves‚ using the amplitude-shift keying (ASK) digital modulation scheme or amplitude modulation (AM) analog modulation scheme. The two carrier waves‚ usually sinusoids‚ are out of phase with each other by 90° and are thus called quadrature carriers
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was initially developed for telephone communication. For radio communication‚ a continuous wave radio signal called double sideband amplitude modulation (DSB-AM) was produced. A sideband is a band of frequencies higher (called upper sideband) or lower (called lower sideband) than the carrier frequencies which is a result of modulation. All forms of modulations produce sidebands. In DSB-AM the carrier and both USB and LSB are present. The power usage in this system proved
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ANALOG COMMUNICATION LAB Amplitude Modulation Date: 4th February 2013 Submitted By ADARSH V R AKHIL KRISHNA R ANANTHU R KRISHNAN ARUN KOSHY T B100291EC B100125EC B100256EC B100091EC S6 ECE Batch: A Contents 1 Introduction 2 Theory 3 Principles and Circuits Used 4 Design 5 Observations and Results 6 Conclusion 3 5 8 15 21 23 2 Chapter 1 Introduction Today‚communication has entered into our daily lives in so many different ways that it is very easy to overlook the multitude
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Systems EEE F311 Contents 1 Aim of the course‚ what to expect? 2 Course content 3 Instructions about the course 4 Introduction/Discussions Aim of the course … Understanding signals and systems Analog & Digital modulation/transmission techniques Understanding important block-sets of communication system Information theory Analysis of communication systems Recent trends in communication References required B.P. Lathi‚ Modern Digital and Analog
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