1. Học Phần – THÔNG TIN DI ĐỘNG
(MobileWireless Communication)
Chapter 1 - Introduction to Mobile Communications
Presenter: Dr. Nguyen Dinh Long
Email: dinhlonghcmut@gmail.com
Phone: +84 947 229 599
Website: sites.google.com/view/long-dinh-nguyen
Dr. Long D. Nguyen
1
29 Aug. 2022
Đại Học Bách Khoa TP. HCM
Bộ Môn Viễn Thông
2. Outline (chapters)
2
Introduction to Mobile Communications
Fundamentals of Mobile Communication – Cellular concept
GSM 2G, CDMA-3G, LTE-4G, NR-5G and beyond
Radio propagation – Large-scale fading & Small-scale fading
Multiple access technology – CDMA
Channel capacity, Equalization, Diversity
Emerging Mobile Communication Systems
3. References
Giáo Trình chính:
▪ T.S. Rappaport ,Wireless Communications, Prentice Hall PTR, 2002.
▪ Hồ Văn Khương, Thông tin di động, Nhà xuất bản ĐHQG-TpHCM, 2020.
Tham khảo:
▪ A. Goldsmith, Wireless Communications, Cambridge University Press, 2005.
▪ J. G. Proakis , M. Salehi , G. Bauch Contemporary Communication Systems Using MATLAB, Cengage
Learning, 2012.
▪ William H.Tranter et al, Principles of communication System and wireless Applications, Prentice Hall
PTR, 2004
▪ Slides here are adapted from several sources on the Internet.
3
4. Chapter 1
1. Introduction to communication systems
▪ Basic diagram, Fundamental concepts
▪ Radio communication
2. Overview of wireless communication
▪ Generations of wireless communication
▪ Current wireless networks
▪ Trends of Mobile wireless communication
3. Mobile Communication Standards and QoS
4. Wireless Communication Issues and Design challenges
5. Emerging wireless network models
4
5. Historical of Communication Systems
▪ Face to Face
▪ Writing on letter sheet
▪ Wire phone
▪ 1876, Alexander G. Bell (“Watson come here; I need you.”)
▪ Wireless mobile (high data rate), multiple communication media
5
6. Historical of Communication Systems
▪ Telegraph
▪ 1830, Joseph Henry
▪ Telephone
▪ 1876, Alexander G. Bell (“Watson come here; I need you.”)
▪ 1888, Strowger stepper switch
▪ 1915, US transcontinental service (requires amplifiers)
▪ Radio
▪ 1906, Reginald Fessendend, first broadcast
▪ 1920, first commercial AM radio station (Montreal XWA ! CINW)
▪ Smart phone, laptop, …
▪ For the Microsoft platforms called Smartphone 2002 and Smartphone 2003
▪ Iphone 13: 6.2 inches, 128GB, RAM-4GB, 13MP camera, 3.1GHz Dual core,
GPU graphics, HDR display, 16M colors, 5GHz, MIMO, Bluetooth v5.1
Light, Proximity, Accelerometer, Barometer, Compass, Gyroscope sensors 6
7. Historical of Communication Systems
▪ 1G – First generation of mobile network
▪ 1980s
▪ AMPS, TACS application
▪ 2.4-9.6 kbps data rate, 300ms latency, several connections
▪ Several KHz bandwidth
▪ 5G-NR – 5th generation of mobile network
▪ 2020s
▪ > 1Gbps data rate, 10ms latency, 1M connections
▪ MIMO, massive MIMO
▪ OFDM
▪ > 20MHz bandwidth up to ~ GHz bandwidth
▪ Voice, HD video, streaming, game high-configuration, video meeting, ...
7
8. Historical of Communication Systems
▪ 1940s
▪ Number of mobile users ~ 50K
▪ Mobile traffic: ~ 1GB
▪ Single antenna
▪ Several connections per BS
▪ 2020
▪ 5.27 billion mobile phone users
▪ Mobile traffic: 127 exabytes = 127 x 109 GB = 127 x 109 x 109 Bytes
▪ Massive antenna number (128, 256, ...)
▪ 1M connections per BS
8
11. 1. Introduction to communication system
▪ The purpose of a communication system is to transport an information bearing signal from a source
to a user destination.
o Analog communication systems: the information bearing signal is continuously varying in both
amplitude and time.
o The performance metric: SNR (Signal to Noise Ratio)
o Digital communication system: the information bearing signal is represented by a sequence of
discrete messages.
o The performance metric: BER (Bit Error Rate)
❑ The goal is to communicate with any information with anyone at anytime from anywhere.
This is possible with aid of wireless technology.
11
14. Basic signal processing blocks
❑ Transmitter:
o Source coding: eliminate or reduce redundancy so as to provide an efficient representation of the
source output.
o Channel coding: introduce redundancy to provide reliable communication over a noisy channel.
o Modulation: to provide the efficient transmission of the signal over the channel.
❑ Channel: wired (telephone channels, coaxial cables, optical fibers) or wireless (microwave radio,
satellite channels, mmWave channel, military channels, …).
❑ Receiver: demodulation, channel decoder, and source decoder.
14
15. 2. Radio Communication
▪ Radio or radio communication means any transmission, emission, or reception of signs, signals,
writing, images, sounds by means of electromagnetic waves of the radio frequency range, from about
3 kHz to 300 GHz propagated in space without artificial guide.
▪ Examples of radio communication systems:
▪ Radio broadcasting.
▪ TV broadcasting.
▪ Satellite communication.
▪ Mobile cellular telephony.
▪ Wireless LAN.
▪ UAVs (Unmanned Aerial Vehicles): ground, sky and underwater/underground
▪ THz communication (>1000 GHz) (based on satellite communication) for >5G …
Introduction
15
16. Classification of radio spectrum
Application
Time
and
Frequency
Normals,
Navigation,
Underwater
Communication,
Remote
sensing
under
ground,
Maritme
telegraphy
Long
distance
communication
(fixed
and
marite),
Broadcasting,
Naviagation,
Radio
beacons
AM
broadcasting,
naviation,
radio
beacons,
distress
frequencies.
Fixed
point
to
point
communication,
Mobile
maritime
aeronautical,
land
services,
military
communication,
amateur
radio
and
broadcasting
Broadcasting,
TV,
FM,
Mobile
services
for
maritime,
aeronautical
and
land,
Wireless
microphones,
Meteor
burst
communicaiton
Broadcasting
TV,
satelites,
Personal
telephone
systems,
radar
systems,
fixed
and
mobile
satelite
services
Fixed
services,
Fixed
statelite
services,
Mobile
serivces,
Remote
sensing
Frequency
assaignments
up
60
GHz
Frequency 300-3000 Hz 3-30 kHz
30-300
kHz
300-3000
KHz
3-30 MHz
30-300
MHz
300-3000
MHz
3-30 GHz 30-300 GHz
Wavelength
1000
-100 km
100
-10 km
10
-1 km
1000
-100 m
100
-10 m
10
-1 m
100
-10 cm
10
-1 cm
10
-1 mm
Term ELF VLF LF MF HF VHF UHF SHF EHF
16
18. The Radio Spectrum
o The frequency spectrum is a shared resource.
o Radio propagation does not recognize geopolitical boundaries (globalization or security).
o International cooperation and regulations are required for an efficient use of the radio spectrum.
▪ The International Telecommunication Union (ITU) is an agency, within the UN, that takes care of this
resource.
o Frequency assignment.
o Standardization.
o Coordination and planning of the international telecommunication services.
▪ The Federal Communications Commission (FCC) regulates interstate and international
communications by radio, television, wire, satellite, and cable in all 50 states.
18
19. History
▪1864: Maxwell describes radio wave mathematically
▪1888: Hertz generates radio waves
▪1890: Detection of radio waves
▪1896: Marconi makes the first radio transmission
▪1915: Radio tubes are invented
▪1948: Shannon’s law
▪1948:Transistor
▪WW II: Rapid development of radio technology.
▪1960: Communication Satellites
▪1981: Cellular technology
19
20. Persons
Invention of radio
generally attributed to Guglielmo
Marconi in the 1890s
whose work included experimental
investigation of radio waves,
establishment of theoretical
underpinnings, engineering and
technical developments, and
adaptation to signaling.
20
21. Persons
Invention of modern radio
21
Jaap Haartsen Nicolas Sornin
Jagadish Chandra Bose
GPS
Martin Cooper
Arogyaswami Paulraj
(MIMO Technology) Thomas Marzetta
(massive MIMO)
Irwin Mark Jacobs
(CDMA)
1.6 billion subscribers
22. History
▪ Voice over Radio and the First Television Transmissions
• *1914 — First voice over radio transmission
• 1920s — Mobile receivers installed in police cars in Detroit
• 1925 — US patent no. 1,544,156 granted to Charles Francis Jenkins for "Transmitting Pictures over
Wireless" (TV).
• 1927 — First long-distance TV transmission in the United States, conducted by AT&T Bell Labs.
• 1928 — First transatlantic TV transmission, from London to New York.
• 1928 — First TV station, W2XB (later WRGB), broadcast from General Electric facility in Schenectady,
NY
• 1930s — Mobile transmitters developed; radio equipment occupied most of police car trunk
• *1935 — Frequency modulation (FM) demonstrated by Armstrong
• 1940s — Majority of police systems converted to FM
22
23. History
▪ Commercial Television and the Birth of Mobile Telephony
• 1946 — First interconnection of mobile users to public switched telephone
network (PSTN)
• 1949 — FCC recognizes mobile radio as new class of service
• 1940s — Number of mobile users > 50K
• 1950s — Number of mobile users > 500K
• 1960s — Number of mobile users > 1.4M
• 1960s — Improved Mobile Telephone Service (IMTS) introduced; supports full-duplex, auto
dial, auto trunking
• 1976 — Bell Mobile Phone has 543 pay customers using 12 channels in the New York City area;
waiting list is 3700 people; service is poor due to blocking
23
24. History
▪ Cellular Mobile Telephony and Steps Toward Wireless Internet
• 1979 — NTT/Japan deploys first cellular communication system
• *1983 — Advanced Mobile Phone System (AMPS) deployed in US in 900 MHz band: supports 666 duplex
channels
• 1989 — Groupe Spècial Mobile defines European digital cellular standard, GSM
• 1990 — Formation of IEEE 802.11 Working Group to define standards for Wireless Local Area Networks
(WLANs)
• *1991 — US Digital Cellular phone system introduced
• 1992 — First GSM phones approved for sale.
• 1992 — Text messaging, or short messaging service (SMS), was designed as part of the GSM cellular system.
• *1993 — IS-95 code-division multiple-access (CDMA) spread- spectrum digital cellular system deployed in US
• *1994 — GSM system deployed in US, relabeled ``Global System for Mobile Communications''
24
25. History
▪ The Wireless Data Era
• 1997 — Release of IEEE 802.11 WLAN protocol, supporting 1-2 Mbit/s data rates in the 2.4 GHz ISM band
• 1999 — Release of IEEE 802.11b WLAN protocol, supporting 1-11 Mbit/s data rates in the 2.4 GHz ISM band
• 1999 — Release of IEEE 802.11a WLAN protocol, supporting 1-54 Mbit/s data rates in the 5 GHz ISM band
• 2003 — Release of IEEE 802.11g WLAN protocol, supporting 1-54 Mbit/s data rates in the 2.4 GHz ISM band
• 2009 — Release of IEEE 802.11n WLAN protocol, supporting up to 150 Mbit/s data rates in both the 2.4 GHz and
5 GHz ISM bands.
• Today - There are 5.27 billion unique mobile phone users in the world today, according to the latest data from
GSMA Intelligence.
25
27. The magic of communication network
(the service for everyone)
Example:
Market of Communication systems (Mobile network)
Each user statistically used 2GB/month for exchanging data traffic
Global data traffic per year is to exceed: 126.48 exabytes (1exabyte = 1e9 GB)
Mobile network services are with $0.11/min (at data rate.100Mbps) or $0.57/GB (Vietnam)
27
Mobile Communication (2020s)
5.27 billion mobile phone users
Mobile traffic: 127 exabytes = 127 x 109 GB = 127 x 109 x 109 Bytes
Massive antenna number (128, 256, ...)
1M connections per BS
28. The magic of communication network
(the service for everyone)
Market of Communication systems (Mobile network)
→ estimated global population is using communication services (5.27 billion users)
Each user statistically used 2GB/month for exchanging data traffic
Global data traffic per year is to exceed: 126.48 exabytes (1exabyte = 1e9 GB)
Mobile network services are with $0.11/min (at data rate.100Mbps) or $0.57/GB (Vietnam)
28
18 18
127 127 10 127 8 10
exabytes bytes bits
= =
18
9
6
127 8 10
127 (100 ) 170 10 mins $18.7 billion
100 10 /
bits
exabytes Mbps
bits s
= =
9 9
127 127 10 GB=127 10 GB $0.57 / $72.4 billion
exabytes GB
=
29. Current Wireless Networks
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❖ Cellular Systems
❖ Satellite Systems
❖ Wireless broadband access (WiMax-compatible)
❖ Paging Systems (one way, two way)
❖ Radio broadcast (analog/digital audio/video)
❖ Cordless phone, personal handyphone system
❖ Wireless LANs
❖ Bluetooth
❖ Ultra-wideband radios
❖ Zigbee radios
❖ Infrared wireless optical (IrDa)
❖ Remote control (toy, garage door)
❖ Special purpose: radar, sonar, missile guidance,…,etc
Wireless Wide Area Network (WWAN)
Metropolitan Area
Networks MAN
Local Area Network LAN
Personal Area Networks PAN
32. 1G First generation wireless
▪ Developed in 1980’s
▪ Analog transmission technology
▪ Focus on voice
▪ Data service almost non-existence
▪ Incompatible standards:
o Different frequencies and signalling
o International roaming impossible
32
33. 2G second generation wireless
❑ 2 G wireless
o Its was invented and developed in 1990-91.
o Digital transmission technology
o Increased quality of service
o Possible for wireless data services
❑ 2.5 G wireless
o General packet radio service (GPRS)
o Data rates: 56 kb/s to 115 kb/s
o Services:WAP, MMS and SMS, Search and directory
❑ 2.75 G wireless
o Maximum data rate: 384 kbps.
33
34. 3G third generation wireless
❑ 3 G wireless
o Introduced in 2004-05
o Applications: mobile TV, video on demand, video conferencing, location based serviced services.
❑ 3.5 G wireless
o Known as HSDPA (high-speed downlink packet access)
o Data transmission up to 8-10 Mbps (and 20 Mbps for some systems)
❑ 3.75 G wireless
o Refereed to HSUPA (high-speed uplink packet access)
o Speed: 1.4 Mbps-5 Mbps, Real-time person to person gaming
34
35. 4G Fourth generation wireless
o A collection of technology creating fully packet-switched networks optimized for data.
o Provide speed of 100 Mbps to 1 Gbps.
o Provide wireless alternative for broadband access to residential and business customers.
❑ 5 G Wireless (2020s)
o Data rate: ~10 Gbps
35
40. 3. QoS Requirements and Design Challenges
▪ QoS refers to the requirements associated with a given application, typically rate and delay
requirements.
▪ It is hard to make a one-size-fits all network that supports requirements of different applications.
▪ Wired networks have much higher data rates and better reliability than wireless.
▪ QoS for all applications requires a cross-layer design approach.
40
41. 3. QoS Requirements and Design Challenges
Voice Video
Data
Delay
Packet Loss
BER
Data Rate
Traffic
<100ms - <100ms
<1% 0 <1%
10-3 10-6 10-6
8-32 Kbps 1-100 Mbps 1-20 Mbps
Continuous Bursty Continuous
41
▪ QoS: quality-of-service
45. mmWave Communication - Frequency spectrum
.
45
The range of electromagnetic signals
encompassing all frequencies is referred to as the
electromagnetic spectrum.
48. Satellite Systems (thinking to 6G …)
❑ Cover very large areas
❑ Different orbit heights
▪ GEO (Geostationary orbit): 36,000 Km
▪ MEO (Medium Earth orbit): 10,000 Km
▪ LEO (Low Earth orbit): 1,000-2,000 Km
48
49. Wireless LAN Standards
▪ 802.11b (Old – 1990s)
o Standard for 2.4GHz ISM band (80 MHz)
o Direct sequence spread spectrum (DSSS)
o Speeds of 11 Mbps, approx. 500 ft range
▪ 802.11a/g (Middle Age– mid-late 1990s)
o Standard for 5GHz NII band (300 MHz)
o OFDM in 20 MHz with adaptive rate/codes
o Speeds of 54 Mbps, approx. 100-200 ft range
▪ 802.11n (Hot stuff, standard close to finalization)
o Standard in 2.4 GHz and 5 GHz band
o Adaptive OFDM /MIMO in 20/40 MHz (2-4 antennas)
o Speeds up to 600Mbps, approx. 200 ft range
o Other advances in packetization, antenna use, etc.
Many WLAN
cards have
all 3 (a/b/g)
49
51. WiMAX (Worldwide Interoperability for Microwave
Access) (802.16)
▪ Wide area wireless network standard
o System architecture similar to cellular
o Hopes to compete with cellular
▪ OFDM/MIMO is core link technology
▪ A physical layer operating in
2 to 66 GHz range
o Different for different countries.
o Bandwidth is 3.5-10 MHz
▪ Fixed (802.16d) vs. Mobile (802.16e) WiMAX
o Fixed: 75 Mbps max, up to 50 mile cell radius
o Mobile: 15 Mbps max, up to 1-2 mile cell radius
51
52. Bluetooth
52
▪ Bluetooth is a wireless technology standard for exchanging data over short distances (using short-
wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices,
creating personal area networks (PANs) with high levels of security
▪ Short range (10m, extendable to 100m)
▪ 1 Data (700 Kbps) and 3 voice channels, up to 3 Mbps
▪ Widely supported by telecommunications, PC, and consumer electronics companies
53. IEEE 802.15.4 / ZigBee Radios
▪ Wireless personal area networks built from small, low-power digital radios.
▪ ZigBee operates in the industrial, scientific and medical (ISM) radio bands; 868 MHz in Europe,
915 MHz in the USA and Australia and 2.4 GHz in most jurisdictions worldwide.
▪ Data rates of 20, 40, 250 Kbps
▪ The low cost allows the technology to be widely deployed in wireless control and monitoring
applications
▪ Very low power consumption
Focus is primarily on low power sensor networks
53
54. Ultra wideband Radio (UWB)
▪ UWB is an impulse radio: sends pulses of
tens of picoseconds(10-12) to nanoseconds (10-9)
o Duty cycle of only a fraction of a percent
▪ A carrier is not necessarily needed
▪ Uses a lot of bandwidth (GHz)
▪ High data rates, up to 500 Mbps
▪ 7.5 GHz of “free spectrum” in the U.S. (underlay)
▪ New UWB proposals (802.15.3): OFDM-based or
CDMA-based
▪
▪ Limited commercial success to date
54
58. Spectrum Regulation
▪ Spectral Allocation in Vietnam controlled by the ARFM (Authority of Radio Frequency
Management)
▪ ARMF auctions spectral blocks for set applications.
▪ Some spectrum set aside for universal use
▪ Worldwide spectrum controlled by ITU-R
▪ Regulation is a necessary evil.
Innovations in regulation being considered worldwide,
including underlays, overlays, and cognitive radios
58
61. 4. Design Challenges
▪ Simplex
▪ Half-duplex
▪ Full-duplex
o The 2 channels can be separated in frequency – Frequency Division Duplex (FDD)
o The 2 channels can be separated in time to share a single physical channel – Time Division Duplex
(TDD)
61
63. Modulation and Multiplexing
▪ Modulation and multiplexing are electronic techniques for transmitting information efficiently from one
place to another.
Modulation makes the information signal more compatible with the medium.
Multiplexing allows more than one signal to be transmitted concurrently over a single medium.
63
65. The Cellular Concept
▪ Why cellular?
▪ Radio spectrum is a finite resource.
▪ How to accommodate a large number of users over a large geographic area within a limited radio spectrum?
▪ The solution is the use of cellular structure which allows frequency reuse.
▪ The large geographic area is divided into smaller areas cells.
▪ Each cell has its own base station providing coverage only for that cell.
▪ Each base station is allocated a portion of the total number of channels available to the entire system.
▪ Neighboring base stations are assigned different groups of channels to minimize interference.
▪ The same group of channels can be reused by another base station located sufficiently far away to
keep co-channel interference levels within tolerable limits.
65
