Aim : To design an optical data communication network which uses Offset Quadrature Phase Shift Keying modulation technique. oftSware used : Optisystem Components used: 1) Psuedo Random Bit Sequence Generator 2) RZ Pulse Generator 3) Fork 1x2 4) Oscilloscope Visualiser 5) RF Spectrum Analyser 6) OQPSK Modulator 7) Quadrature De-modulator 8) M-ary Threshold Detector 9) Eye Diagram Analyzer 10) PSK Sequence Decoder
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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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1.1 ABSTRACT: 2 .1 BLOCK DIAGRAM: Fig 2.1 Block diagram for FSK modulation and de-modulation 2.2.1 PIN DIAGRAM- IC 565 : Fig 2.2 Pin diagram for IC 565 2.2.2 PIN DIAGRAM -IC 555: Fig 2.3 Pin diagram for IC 555 3.1 DESIGN CALCULATION: 3.1.1 FSK MODULATOR: ON time TH=0.693RBC OFF time TL=0.693(RA+RB)C Total time T=TH+TL=0.693(RA+2RB)C 1 f1= -------------------------- → (1)
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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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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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(m2/2) ] = 500W [ 1 + (0.92/2) ] = 702.5W 4. An intelligence signal is amplified by a 70% efficient amplifier before being combined with a 10kW carrier to generate the AM signal. If it is desired to operate at 100% modulation‚ what is the dc input power to the final intelligence amplifier? Solution: The efficiency of an amplifier is the ratio of AC output power to DC input power. To fully modulate a 10kW carrier requires 5kW of intelligence. Therefore
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Communications Equipment) at point A. 3. The DCE at point A. 4. The transmission channel between points A and B. 5. The DCE at point B. 6. The DCE - DTE interface at point B. 7. The DTE at point B. DIGITAL MODULATION Phase Shift Keying -One of the simplest forms of digital modulation is binary or Bi-Phase Shift Keying (BPSK). One application where this is used is for deep space telemetry. The phase of a constant amplitude carrier signal moves between zero and 180 degrees. On an I and Q diagram
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TimeView™ ABCs of Modulation Domain Analysis Background An instrument like an Oscilloscope lets you view voltage variations over time. A Spectrum Analyzer lets you view voltage variations over frequency. A Modulation Domain Analyzer (MDA) lets you view frequency variations over time. Figure 1 shows all three dimensions pictorially. To analyze all dynamic properties of a signal‚ all three of these tools are required: Oscilloscope (v vs. t) Spectrum Analyzer (v vs. f) Modulation Domain Analyzer (f
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Society SPACE VECTOR MODULATION –An Introduction == Tutorial at IECON2001== Dorin O. Neacsu Correspondence Address: Satcon Corporation‚ 161 First Street‚ Cambridge‚ MA 02142‚ Email neacsu@earthlink.net I. INTRODUCTION Space Vector Modulation became a standard for the switching power converters and important research effort has been dedicated to this topic. Tens of papers‚ research reports and patents were developed in the last ten years and the theory of Space Vector Modulation is already wellestablished
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