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Title Extended Orthogonal Space-Time Block Coding Systems for Multiple Input Multiple Output Wireless Communication
Degree MS
Author Soon-Kyu Lee
Advisor Kiseon Kim
Graduation Date 2009.02.24 File
    Date 2013-09-11 20:08
The wireless systems are now popular worldwide to help people and machines to
communicate with each other irrespectively of their location. At the present time, de-
mands for higher capacity in wireless communications, driven by cellular mobile, wire-
less internet and multimedia services have been rapidly increasing worldwide. Thus,
reliable communication in multiple-access systems over the °at-fading channel typically
requires the increase of diversity in systems to limit the required transmit power and
to reduce co-channel interference. The current trend to achieve high spectral e±ciency
is by utilizing multiple antennas for both transmitter and receiver. Adaptivity in com-
munication can be used in all possible dimensions: time, frequency, power and space.
We can use those dimensions to increase diversity.
Diversity techniques in multiple-input multiple-output(MIMO) systems are widely
used to overcome fading phenomenon and provide the reliability of transmission with-
out additional bandwidth in wireless environment. Diversity techniques are divided
according to the location of antennas, transmit diversity and receive diversity. For
the downlink, it is more practical to consider transmit diversity in order to reduce the
complexity of mobile stations. The space-time coding is a method to provide transmit
diversity. In this ?eld, the objective is to obtain full diversity and full rate simultane-
ously. However, this situation is realized in only two transmit antenna case. There are
a variety of techniques in order to overcome this problem. Quasi-orthogonal space-time
block coding (QO-STBC) attained full rate at the expense of full diversity.
광주과학기술원 한·러 MT-IT 융합기술연구센터 광주과학기술원정보통신공학부