CCE-423 Wireless and Cellular Communication

Professor Md Samsuzzaman

References

Book: Jochen H. Schiller - Mobile Communications (2nd Edition) - {Solution}

Group Work

Assignment: Research Paper Study (Group)

Checklist for Your Group:

  • Video presentation is recorded (slides + face).
  • Video is over 10 minutes long.
  • Presentation is in English.
  • Q&A document is prepared with a cover page.
  • PowerPoint file is finalized.
  • All three files are named correctly using your Student ID.
  • All files are uploaded to Google Classroom before 11:59 AM.

Google Classroom: Link

Introduction

  • Licensed and Unlicensed Bands
  • 2.4 GHz

  • 5 GHz

  • ISM

Slide: Lecture 1

Slide: Chapter 01 - Introduction

Chapter 4 : Wireless Telecommunication System

Slide: Chapter 04 - Wireless_Telecommunication

  • Market, GSM, TETRA, UTMS/IMT-2000

Telecommunication Sector

  • Development
  • History
  • Technologies

Source: Statista, GSMA Intelligence

Q&A : Mobile phone feature developments over time

Slide: 22/23-44

GSM

  • elements and interface
  • system architechture \(\star \star \star\)
  • radio subsystem
  • cellular network
  • frequency bands
  • operation subsystem

Question and Tasks

GSM \(\to\) IDMA/FDMA

GSM protocol layes for signalling

  • what does what?

Slide: 43-49

  • Roaming \(\star \star \star\)
  • VLR
  • MS+ISDN
  • IMSI
  • MCC
  • MNC
  • TMSI (4 bytes)
  • MSRN

Page: 116

  • MTC vs MOC
  • Handover
  • MS
  • BTS
  • BSC
  • MSC
  • Reasons of hardover
  • handover decision

Completed from the slide

Sarna Majumder

References

Book: Jochen H. Schiller - Mobile Communications (2nd Edition) - {Solution}

Slides: - C02-Wireless_Transmission[1]-2.ppt - C03-Media_Access[1].ppt - C06-Broadcast_Systems[1].ppt - C07-Wireless_LANs[1]_SMB.ppt

Introduciton

Wireless Communication

  • Evolution of wireless communicaiton \(\to\) self study
  • Block diagram of wireless communication

To-Do

Block diagram of encrypted communicaiton

Chapter 02 : Wireless Transmission

  • Compostite Signal \(\to\) Fourier transform
  • Isotropic Radiator (Antenna) \(\to\) ideal antenna

Note

Signals attenuate in space

  • \(4 \pi d^2\)

  • Simple dipole + monopole

  • directed and sectorized
  • diversity

Smart Antenna

  • Switched Beam
  • Adaptive Array

Signal Propagation Range

  • Transmission
  • Detection
  • Interference range

Signal Propagation

Multipath Propagation

  • delay spread (cause)
  • Inter Symbol Interference (ISI) (reason)

2.14.1 Effects of Mobility

  • fading
  • short time
  • long time

  • doppler effect

  • Engineers calculates these:

  • (Ray Tracing)

Multiplexing 4 dimentions:

  • space (s) \(\to\) Guard Space needed
  • time (t)
  • frequency (f)
  • code (c)

2.16.1 Frequency Multiplex

  • frequency bands \(\to\) static
  • Adjacent Channel Interference (ACI)

Time Multiplex

  • Co-channel Interference

Time and Frequency

  • certain frequency band for a certain time
  • GSM

Code Multiplex

  • Orthogonal Code \(\to\) multiplication (of two code) = 0

2.20.1 Modulation

Digital Modulation

Advanced Frequency Shift Keying (MSK)

  • even, odd bits
  • doubling each bits
  • \(f_1\) \(\to\) lower frequency
  • \(f_2\) \(\to\) higher frequency

Topics

  • Spread Spectrum Technology
  • Effects of spreading and interference
  • Spreading and frequency selection fading
  • DSSS (Direct Sequence Spread Spectrum)
  • Chipping Sequence
  • used in Military
  • FHSS (Frequency Hopping Spread Spectrum)
  • Fast hopping (hops/bit)
  • Slow hopping (bits/hop)
  • Cell Structure -
  • Detection
  • Interference
  • SDM (Space Division Multiplexing)
  • FDM (Frequency Division Multiplexing)
  • Frequency broadening
  • FCA, DCA, CH, fixed, dynamix

Exercise Questions: \(\star \star \star\)

  • for 3, 4, 5 marks

Assignment

Chapter 2 Exercise Q&A for 3-5 marks

Exercise Q&A

  • Low Frequency \(\to\) Gravity ?!
  • ISM (Industry Scientific Medical)
  • ISI Mitigation
  • Why don't we use CDMA for mobile communication now?

Chapter 3 : Media Access

Topics

  • CDMA/CD
  • Hidden Terminal + Exposed Terminal
  • Near and Far Terminal
  • FDD/FDMA
  • FDD (Frequency Division Duplex)
  • Aloha/Slotted Aloha
  • DAMA (Demand Assigned Multiple Access)
  • DAMA: Explicit Reservation
  • Access Method DAMA: PRMA
  • Implicit Reservation
  • Access Method: Reservation TDMA
  • MACA (Multiple Access Collision Avoidance)
  • DF MAC
  • Polling
  • ISMA (Inhibit Sensor Multiple Access)
  • Low Frequency \(\to\) gravity ?
  • ISM \(\to\) Industry - Scientific - Medical
  • ISI Mitigation
  • 3.17.1 CDMA (Access Method CDMA)
  • What is a good code for CDMA?
  • good autocorrection
  • orthogonal to other codes
  • What would happen is, for example, B was much stronger?
  • 3.19.1 Coding and spreading of data from Sender A. \(\star\)
  • Extra: How the chipping sequence ...
  • Walsh code \(\to\) downlink (Forward)
  • PN \(\to\) uplink (Reverse)
  • Closed loop (tight loop)
  • Open loop (coarse)
  • What 'collapse' means?
  • Explain why TDMA/FDMA don't suffer this collapse as severly?
  • RAKE Receiver in CDMA
  • Multi User Detection (MUD) in CDMA
  • names \(\to\) idea (must)
  • Why LTE abandoned CDMA in uplink?
  • uses SC-CDMA
  • Explain why LTE downlink still resembles CDMA ideas?

Conclusion: Chapter-3 from Book + Slide's last pages

Assignment

Chapter 3 Exercise Q&A for 3-5 marks

Chapter 6 : Broadcast System

  • Unidirectional Distribution Systems
  • Structured Tansmission Boradcast disks
  • Carousel
  • DAB (Digital Audio Broadcast)
  • Architecture
  • DAB Transport Mechanisms
  • Transmission Frame
  • DAB Sender
  • DAB Receiver
  • Bit rate management
  • Example of a reconfiguration
  • MOT (Multimedia Object Transfer) Protocol
  • MOT - Structure
  • DVB (Digital Video Broadcasting)
  • Container
  • High speed internet

Chapter 7 : Wireless LANs

  • adhoc network
  • 802.11 - Architecture of an Infrastructure Network
  • 802.11 - Architecture of an AdHoc Network
  • Piconet
  • Scatternet