2013/11/25 System Arch 1

SYSTEM ARCHITECTURE

ADVANCED SYSTEM ARCHITECTURE

BATEMAN

Chapter5: Bandpass digital modulation

2013/Fall-Winter Term

Monday 12:50

Room# 1-322 or 5F Meeting Room

Instructor: Fire Tom Wada, Professor

Chapter5: Bandpass digital modulation

5.1 Introduction

5.2 Amplitude Shift Keying (ASK)

5.3 Frequency Shift Keying (FSK)

5.4 Phase Shift Keying (PSK)

5.5 Comparison of binary modulation schemes

2013/11/25 System Arch 2

Frequency range for communication

2013/11/25 System Arch 3

Chapter5: Bandpass digital modulation

5.1 Introduction

5.2 Amplitude Shift Keying (ASK)

5.3 Frequency Shift Keying (FSK)

5.4 Phase Shift Keying (PSK)

5.5 Comparison of binary modulation schemes

2013/11/25 System Arch 4

What is Amplitude Shift Keying (ASK)

Simplest form of bandpass data modulation is ASK.

2013/11/25 System Arch 5

Binary ASK (1bit)

= ON-OFF Keying

8-ary ASK

8-ASK (3bit)

ASK spectrum is Symmetry

When pulse is up-converted, Symmetry

Spectrum appears!

2013/11/25 System Arch 6

From page 5

Up-conversion process

2013/11/25 System Arch

Up-conversion at TX

Double sideband spectrum

2013/11/25 System Arch 8

Example 5.1

2013/11/25 System Arch 9

2013/11/25 System Arch 10

Solution 5.1(a)From page 42

2013/11/25 System Arch 11

Solution 5.1(b,c)

33dB=10𝑙𝑜𝑔10𝑆𝑁𝑅

SNR=1033

10

Generation of ASK (1)

2013/11/25 System Arch 12

Linear modulation

Generation of ASK (2)

2013/11/25 System Arch 13

8-ASK

Bandwidth limited ASK generation (1)

2013/11/25 System Arch 14

Bandpass filtering method

Bandwidth limited ASK generation (2)

2013/11/25 System Arch 15

Baseband filtering method

Detection ASK –non-coherent-(1)

2013/11/25 System Arch 16

Envelop detector

Detection ASK –coherent-(2)

2013/11/25 System Arch 17

Example 5.2

2013/11/25 System Arch 18

Solution 5.2

2013/11/25 System Arch 19

Example 5.3 constellation

2013/11/25 System Arch 20

Chapter5: Bandpass digital modulation

5.1 Introduction

5.2 Amplitude Shift Keying (ASK)

5.3 Frequency Shift Keying (FSK)

5.4 Phase Shift Keying (PSK)

5.5 Comparison of binary modulation schemes

2013/11/25 System Arch 21

FSK waveform

2013/11/25 System Arch 22

FSK signal generation

2013/11/25 System Arch 23

Example 5.4

2013/11/25 System Arch 24

Solution 5.4

2013/11/25 System Arch 25

Chapter5: Bandpass digital modulation

5.1 Introduction

5.2 Amplitude Shift Keying (ASK)

5.3 Frequency Shift Keying (FSK)

5.4 Phase Shift Keying (PSK)

5.5 Comparison of binary modulation schemes

2013/11/25 System Arch 26

Coherent and Differential PSK

2013/11/25 System Arch 27

PSK Spectrum

2013/11/25 System Arch 28

PSK signal generation

2013/11/25 System Arch 29

Constellation of PSK and ASK

2013/11/25 System Arch 30

Need two presenter

Each presenter shall chose two problems

from 5.1 to 5.12. The one for even and the

other for odd problems.

Show your answer at the beginning of next

lecture. Each has 5 minutes.

Next lecture will be 12/2 (mon)

2013/11/25 System Arch 31