EEE 4117 introduces radio communication systems. It covers the design of radio transmitters and receivers using scattering parameters. It also covers the design of amplitude, frequency, and pulse modulation systems, including effects of noise. Key topics include radio spectrum management; history from Maxwell to transistors; and modulation/demodulation circuits and their noise performance.

1. EEE 4117 Radio and TV Engineering
Contact hours/week: 3 Credits: 3.00
Introduction to radio communication, History, Frequency
management. Design of radio transmitter and receiver circuits
using scattering-parameter methods. Circuits include
oscillators, radio frequency amplifiers and matching networks,
mixers and detectors. Design of amplitude, frequency, and
pulse-modulated communication systems, including
modulators, detectors, and the effects of noise.

2. Radio Communication
• Radio or radio communication means any transmission,
emission, or reception of signs, signals, writing, images,
sounds or intelligence of any nature by means of
electromagnetic waves of frequencies lower than three
thousand gigacycles per second (3000 GHz) propagated in
space without artificial guide.
• Examples of radio communication systems:
– Radio broadcasting.
– TV broadcasting.
– Satellite communication.
– Mobile Cellular Telephony.
– Wireless LAN.
– Multimedia communication & Mobile Internet

5. 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
• 1960: Communication Satellites
• 1981: Cellular technology

6. 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
30-3000
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

7. Radio Communication
• Three main problems:
– The path loss
– Noise
– Sharing the radio spectrum

8. Communication Systems
Source of
information
Information
sink
Transmitter
Channel
Receiver
Message
signal
Estimate of
message signal
Transmitted signal
Received signal
+ Noise & Interference

9. Analog Communication System
Source of
information
Signal
Processing
Modulator RF-Stage
Channel
RF-Stage
Information
sink
Signal
Processing
Demodulator

10. Digital Communication System

11. decibels
• The bel is a logarithmic unit of power ratios. One bel corresponds to an increase
of power by a factor of 10 relative to some reference power, Pref.









ref
bel
P
P
P 10
]
[ log









ref
dB
P
P
P 10
]
[ log
10
• The bel is a large unit, so that decibel (dB) is almost always used:
• The above equation may also be used to express a ratio of voltages (or field
strengths) provided that they appear across the same impedance (or in a
medium with the same wave impedance):









ref
dB
V
V
V 10
]
[ log
20

12. decibels
Unit Reference Power Application
dBW 1 W Absolute power
dBm 1 mW Absolute power
P [dBW] = P [dBm] - 30
dBmV 1 mV Absolute voltage, typically at the input
terminals of a receiver
dB any Gain or loss of a network
dBmV/m 1 mV/m Electric field strength
dBi Power radiated by an isotropic
reference antenna
Gain of an antenna
dBd Power radiated by a half-wave
dipole
Gain of an antenna
0 dBd = 2.15 dBi