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Performance analysis of channel codes in multiple antenna OFDM systems
Thesis (PhD)--University of Pretoria, 2012.
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University of Pretoria
2013
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| _version_ | 1867613502283186176 |
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| access_status_str | Open Access |
| author2 | Maharaj, Bodhaswar Tikanath Jugpershad |
| author_browse | Maharaj, Bodhaswar Tikanath Jugpershad |
| author_facet | Maharaj, Bodhaswar Tikanath Jugpershad |
| collection | Thesis |
| dc_rights_str_mv | © 2012 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD)--University of Pretoria, 2012. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/25431 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:10.039Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/25431 Performance analysis of channel codes in multiple antenna OFDM systems Maharaj, Bodhaswar Tikanath Jugpershad darryso@gmail.com Sokoya, Oludare Ayodeji Fading channels Space-time codes Space-frequency codes Ofdm Multiple antenna techniques Pairwise error probability Equalisation UCTD Thesis (PhD)--University of Pretoria, 2012. Multiple antenna techniques are used to increase the robustness and performance of wireless networks. Multiple antenna techniques can achieve diversity and increase bandwidth efficiency when specially designed channel codes are used at the scheme’s transmitter. These channel codes can be designed in the space, time and frequency domain. These specially designed channel codes in the space and time domain are actually designed for flat fading channels and in frequency selective fading channel, their performance may be degraded. To counteract this possible performance degradation in frequency selective fading channel, two main approaches can be applied to mitigate the effect of the symbol interference due to the frequency selective fading channel. These approaches are multichannel equalisation and orthogonal frequency division multiplexing (OFDM). In this thesis, a multichannel equalisation technique and OFDM were applied to channel codes specially designed for multiple antenna systems. An optimum receiver was proposed for super-orthogonal space-time trellis codes in a multichannel equalised frequency selective environment. Although the proposed receiver had increased complexity, the diversity order is still the same as compared to the code in a flat fading channel. To take advantage of the multipath diversity possible in a frequency selective fading channel, super-orthogonal block codes were employed in an OFDM environment. A new kind of super-orthogonal block code was proposed in this thesis. Super-orthogonal space-frequency trellis-coded OFDM was proposed to take advantage of not only the possible multipath diversity but also the spatial diversity for coded OFDM schemes. Based on simulation results in this thesis, the proposed coded OFDM scheme performs better than all other coded OFDM schemes (i.e. space time trellis-coded OFDM, space-time block coded OFDM, space-frequency block coded OFDM and super-orthogonal space-time trellis-coded OFDM). A simplified channel estimation algorithm was proposed for two of the coded OFDM schemes, which form a broad-based classification of coded OFDM schemes, i.e. trelliscoded schemes and block-coded schemes. Finally in this thesis performance analysis using the Gauss Chebychev quadrature technique as a way of validating simulation results was done for super-orthogonal block coded OFDM schemes when channel state information is known and when it is estimated. The results obtained show that results obtained via simulation and analysis are asymptotic and therefore the proposed analysis technique can be use to obtain error rate values for different SNR region instead of time consuming simulation. Electrical, Electronic and Computer Engineering unrestricted 2013-09-06T21:18:37Z 2013-06-27 2013-09-06T21:18:37Z 2013-04-15 2012 2013-06-10 Thesis Sokoya, OA 2012, Performance analysis of channel codes in multiple antenna OFDM systems, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/25431 > D13/4/710/ag http://hdl.handle.net/2263/25431 http://upetd.up.ac.za/thesis/available/etd-06102013-151000/ © 2012 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Fading channels Space-time codes Space-frequency codes Ofdm Multiple antenna techniques Pairwise error probability Equalisation UCTD Performance analysis of channel codes in multiple antenna OFDM systems |
| title | Performance analysis of channel codes in multiple antenna OFDM systems |
| title_full | Performance analysis of channel codes in multiple antenna OFDM systems |
| title_fullStr | Performance analysis of channel codes in multiple antenna OFDM systems |
| title_full_unstemmed | Performance analysis of channel codes in multiple antenna OFDM systems |
| title_short | Performance analysis of channel codes in multiple antenna OFDM systems |
| title_sort | performance analysis of channel codes in multiple antenna ofdm systems |
| topic | Fading channels Space-time codes Space-frequency codes Ofdm Multiple antenna techniques Pairwise error probability Equalisation UCTD |
| url | http://hdl.handle.net/2263/25431 http://upetd.up.ac.za/thesis/available/etd-06102013-151000/ |