CCE-423 Wireless and Cellular Communication
Professor Md Samsuzzaman
Reference Book:
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
Sarna Majumder
Reference Book: Jochen H. Schiller - Mobile Communications (2nd Edition)
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