Page 47 - DCAP311_DCAP607_WIRELESS_NETWORKS

Manmohan Sharma, Lovely Professional University Unit 3: Radio Frequency and Light Signal Fundamentals

Unit 3: Radio Frequency and Light Signal Fundamentals Notes

CONTENTS

Objectives
Introduction
3.1 Wireless Transceivers
3.1.1 Digi Wireless Transceiver Modules
3.2 Understanding RF Signals
3.2.1 RF Signal Attributes

3.2.2 RF Signal Pros and Cons
3.2.3 RF Signal Impairments
3.2.4 Interference
3.2.5 Multipath

3.3 Working of Light Signals
3.4 Modulation
3.4.1 Frequency Shift-Keying (FSK)
3.4.2 Phase Shift-Keying (PSK)
3.4.3 Quadrature Amplitude Modulation (QAM)

3.4.4 Spread Spectrum
3.4.5 Orthogonal Frequency Division Multiplexing (OFDM)
3.4.6 Ultra Wideband Modulation (UWB)
3.5 Sending Data Packets in the Air

3.6 Summary
3.7 Keywords
3.8 Review Questions
3.9 Further Readings

Objectives

After studying this unit, you will be able to:

z z Describe the Radio frequency and radio frequency receiver
z z Discuss the working of light signals

z z Explain about wireless transceiver
z z Discuss the modulation and amplification
Introduction

Radio frequency (RF) is a rate of oscillation in the range of about 3 kHz to 300 GHz, which
corresponds to the frequency of radio waves, and the alternating currents which carry radio

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