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Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
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Thesis - Electrical Engineering >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/123456789/1497
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| Title: | Performance Comparison of Spatial Multiplexing and Spatial Diversity in Rate Adaptive Wireless MIMO Systems |
| Authors: | Zelalem, Fikre |
| Advisors: | Dr. Ing. Hailu Ayele |
| Keywords: | Spatial Diversity
Spatial Multiplexing
Maximum Likelihood
Space Time Coding
D-Blast and V-Blast |
| Copyright: | 2007 |
| Date Added: | 18-Oct-2008 |
| Publisher: | Addis Ababa University |
| Abstract: | Multiple antenna systems are known to provide spatial diversity and spatial
multiplexing advantages in constructing a reliable and spectrally efficient
communication link. In spatial diversity scheme the same message or replica of
the same message is transmitted from the number of transmit antennas in
such a way that at least one of transmitted messages reaches the receiver with
out error. In this scheme the main objective is reduction in the probability of
error. Unlike spatial diversity, in spatial multiplexing scheme different
messages are transmitted from each of the transmit antennas so that the rate
of data transfer between the transmitter and receiver is increased. As far as
practical system is concerned it needs to have both advantages in order to have
a high data rate link with low probability of error.
In this thesis by adaptively varying the modulation order of the spatial diversity
and spatial multiplexing systems both advantages are obtained for an
application with a certain error rate performance requirement. The simulation
result has shown that the spatial multiplexing system has a higher throughput
at high SNR values as compared to the spatial diversity system. At low SNR
values, it is the spatial diversity system that results in high throughput. The ML
detection of spatial diversity system has less computational complexity as
compared to ML detection spatial multiplexing scheme. |
| Description: | A thesis submitted to the school of graduate studies of Addis
Ababa University in partial fulfillment of the requirements for
the degree of
Masters of Science in Electrical Engineering |
| URI: | http://hdl.handle.net/123456789/1497 |
| Appears in: | Thesis - Electrical Engineering
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