Frequency modulation

FSK MODULATION AND DEMODULATION PROGRAM USING MATLAB LIST OF TABLES: CHAPTER 1: INTRODUCTION. 1.1-INTRODUCTION TO WIRELESS MODEM. 1.2-INTRODUCTION TO FREQUENCY SHIFT KEYING 1.2.1-FSK MODULATOR 1.2.2-FSK DEMODULATION CHAPTER 2: COMPONENT DESCRIPTION. 2.1-LIST OF COMPONENTS 2.2-DESCRIPTION OF FUNCTIONAL DIAGRAM 2.2.1 IC 555. 2.2.2 565 PLL. CHAPTER 3: CIRCUIT DIAGRAM AND WORKING. 3.1-CIRCUIT DIAGRAM OF FSK MODULATOR USING IC555. 3.2-CIRCUIT DIAGRAM OF FSK DEMODULATOR USING PLL 555 CHAPTER

Orthogonal Frequency Division Multiplexing is a transmission scheme that is widely used in broadcast and wireless communication technologies. Some of the applications employing OFDM include Digital Audio Broadcast (DAB), Digital Video Broadcasting Terrestrial (DVB-T2), Wireless-LAN, Worldwide Interoperability for Microwave Access (WiMAX) and 4G Long Term Evolution (LTE) radio technologies [1, 2]. Two of the main reasons to use OFDM are to increase date rates and robustness against frequency-selective

Due to the spectacular growth of the wireless services and demands during the last years, the need of a modulation technique that could transmit high data rates at high bandwidth efficiency strongly imposed. The problem of the inter–symbol interference (ISI) introduced by the frequency selectivity of the channel became even more imperative once the desired transmission rates dramatically grew up. Using adaptive equalization techniques at the receiver in order to combat the ISI effects could be the

among switches. Balancing problems while delivering real power above 3-levels. Requires a large number of diodes which is a quadratic function of the number of levels. The diodes reverse recovery time can become problematic for high switching frequencies. CAPACITOR-CLAMPED Requires only one DC source. Significantly reduced number of components compared to the NPC inverter. Redundant switching states allow for both active and reactive power conversions although purely reactive is problematic.

(CNR), and bit error rate (BER).The results indicate that wavelength division multiplexing is a fiber optic technology appropriate for avionics applications. INTRODUCTION During flight, aircraft avionics transmit and receive Radio Frequency signals from/to antennas over coaxial links. The electromagnetic interference (EMI) environment corrupts proportionately, as the density and complexity of onboard avionics increases, which prompts diminish in signal-to-noise ratios (SNRs) and potential

digital modulation techniques that are implemented in modern communication systems. Currently most of the wireless transmission and radio communication systems adapts digital modulation techniques because of its ability to provide high information capacity, better data encryption, greater noise immunity and easier multiplexing of different forms of inputs/information such as sound, video etc. All the experiments and data collected are obtained using software called Simulink. Digital modulation techniques

At the transmitter side, our system consist of WDM transmitter for RZ and NRZ modulation, and a CW laser array is used for the radiation of light waves. It is one that emits radiation continuously rather than in short bursts, as in pulsed laser. Externally modulated subsystem consists of Pseudo Random Bit Sequence (PRBS) generator, NRZ Pulse generator, two Mach-Zehnder modulators & a sine carrier for CSRZ modulation. WDM multiplexer multiplexes 8 number of WDM signal channels. The transmission

TERM PAPER/SEMINAR   on    Title: Software defined radio for RFID   Submitted to   Amity school of engineering and technology (ASET)   Guided By:                                                                               Submitted By:       Alka Singhla           Saksham Gupta                                                                              A2305114062                 

are to meet. Section 1 will discuss the Open Systems Intercommunication (OSI) model for communication systems. Section 2 will look at Analog to Digital Converters for transmission and reception using digital communication. Section 3 will include modulation standards. Section 4 will contain linking and Section 5 encryption standards. 1. OSI Physical Layer and Data Link Layer OSI model has a

transmission lines meant for electric power distribution to comsumers.The basic principle involved in PLC is that these can be operated by adding a carrier signal to the existing wiring system. The propagation problem is a limiting fator for PLC’s. Low Frequencies are generally to carry data over