This document discusses the objectives and topics covered in the course EC8092 - Advanced Wireless Communication. The objectives are to teach students about improving wireless channel capacity using MIMO, mitigating channel impairments using space-time codes, and advanced MIMO systems. Topic 1 discusses wireless channel capacity when the transmitter knows or doesn't know the channel. There is a growing demand for wireless communication but limited spectrum availability, requiring techniques like MIMO to improve data rates and capacity.

1. Subject handled by
Parameswari.A
EC8092- Advanced Wireless
Communication

2.  OBJECTIVES:
 To expose the students to the importance of
improving capacity of wireless channel using
MIMO
 To enable understanding of channel impairment
mitigation using space-time block and Trellis
codes
 To teach advanced MIMO system like layered
space time codes, MU-MIMO System and MIMO-
OFDM systems

3. UNIT I CAPACITY OF WIRELESS
CHANNELS
 The crowded spectrum, need for high
data rate, MIMO systems – Array Gain,
Diversity Gain, Data Pipes, Spatial
MUX, MIMO System Model. MIMO
System Capacity – channel known at
the TX, Channel unknown to the TX –
capacity of deterministic channels,
Random channels and frequency
selective channels.

4. Wireless communication
system
 wireless communication system has become an
essential part of various types of wireless
communication devices, that permits user to
communicate even from remote operated areas.
 There are many devices used for wireless
communication like mobiles. Cordless
telephones, Zigbee wirelss technology, GPS, Wi-
Fi, satellite television and wireless computer
parts. Current wireless phones include 3 and 4G
networks, Bluetooth and Wi-Fi technologies.

5. Applications of Wireless
Communication
• Applications of wireless
communication involve security
systems, television remote control,
Wi-Fi, Cell phones, wireless power
transfer, computer interface devices
and various
wireless communication based
projects.

6. The crowded spectrum
 The demands on bandwidth and
spectral availability are endless.
Currently wireless finds its widest
expression in fixed and mobile roles.

7. The crowded spectrum cont..
 In the fixed role, wireless is used extensively for
data transfer, especially from desktop computers
and laptops.
 In the mobile role, wireless networks provide
mobility for use from fast vehicles for both voice
and data.

8. The crowded spectrum cont..
 Consequently wireless designers face an uphill
task of limited availability of radio frequency
spectrum and complex time varying problems in
the wireless channel, such as fading and
multipath, as well as meeting the demand for high
data rates.
 Simultaneously, there is an urgent need for better
quality of service (QoS), compared with that
obtainable from DSL and cable.

9. Need for High Data Rates
 The first mobile communications systems were
analog and are today referred to as systems of
the first generation.
 In the beginning of the 1990s, the first digital
systems emerged, denoted as second generation
(2G) systems
 which operated in the 900 MHz or the 1,800-MHz
band and
supported data rates up to 22.8 kbit/s.- all countries
except USA uses GSM
United States-TDMA/136

10. Need for High Data Rates
 To accomplish higher data rates
two add-ons
 high-speed circuit switched data (HSCSD)
 The general packet radio service(GPRS),
 providing data rates up to 38.4 kbit/s and 172.2
kbit/s, respectively.

11. Need for High Data Rates
cont..
 The demand for yet higher data rates forced the
development of a new generation of wireless
systems, the so-called third generation (3G).
 maximum data rate of at least 384 kbit/s for
mobile and 2 mbit/s for indoors.

12. Need for High Data Rates
cont..
 One of the leading technologies for 3G systems is the
now well-known universal mobile telephone system
(UMTS) [also referred to as wideband code-division
multiplex (WCDMA) or UTRA FDD/TDD]
 UMTS is the natural evolutionary choice for operators
of GSM networks, currently representing a customer
base of more than 850 million end users in 195
countries and representing over 70% of today’s
digital wireless market.
 UMTS is also a cellular system and operates in the 2-
GHz band. Compared with the 2G systems, UMTS is
based on a novel technology.

13. Need for High Data Rates
cont..
 To yield the 3G data rates, an alternative
approach was made with the enhanced data
rates for GSM evolution (EDGE) concept. The
EDGE system is based on GSM and operates in
the same frequency bands.
 To enhanced data rates,
 As for GSM, two add-ons were developed for
EDGE, namely enhanced circuit switched data
(ECSD) and the enhanced general packet radio
service (EGPRS).
 The maximum data rate of the EDGE system is
473.6 kbit/s, which is accomplished by means of
EGPRS.