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Title Performance Analysis of Quasi-Orthogonal Space-Time Block Codes Systems for High Data Rate Wireless Communication
Degree MS
Author Chang-Yeul Huh
Advisor Kiseon Kim
Graduation Date 2008.02.24 File
    Date 2013-09-11 20:21
The wireless systems are now popular worldwide to help people and machines to
communicate with each other irrespectively of their location. In a near future, demands
for higher capacity in wireless communications, driven by cellular mobile, internet and
multimedia services have been rapidly increasing worldwide. Thus, reliable commu-
nication 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 communi-
cation can be used in all possible dimensions: time, frequency, power and space. We
can use those dimensions to increase diversity.
It has been shown from the Alamouti that space-time block designs can achieve full
diversity and full rate simultaneously. Orthogonal space-time block codes (OSTBCs)
are widely used due to their simple design and decoding complexity. However, OSTBCs
currently only yield a full transmit rate for two transmit antennas. When more than
two transmit antennas are considered, quasi-orthogonal STBCs (QOSTBCs) are used
to maintain the full transmit rate. QOSTBCs have the potential to maintain the full
transmission rate instead of losing some diversity. The main characteristic of QOSTBCs
is to break the orthogonality property, as the columns of transmission matrices are not
orthogonal to each other. To achieve the maximum diversity for QOSTBCs, the signal
constellation rotation scheme is introduced. The optimum rotated angle is calculated
based on the maximizing the diversity product distance.
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