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Turbo equalisation based on data directed estimation for standard high frequency waveforms
Dissertation (MEng (Electronic Engineering))--University of Pretoria, 2021.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613500198617088 |
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| access_status_str | Open Access |
| author2 | Du Plessis, Warren Paul |
| author_browse | Du Plessis, Warren Paul |
| author_facet | Du Plessis, Warren Paul |
| collection | Thesis |
| dc_rights_str_mv | © 2022 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 | Dissertation (MEng (Electronic Engineering))--University of Pretoria, 2021. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/83797 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:08.061Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| 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:2263/83797 Turbo equalisation based on data directed estimation for standard high frequency waveforms Du Plessis, Warren Paul u12115917@tuks.co.za Van der Westhuizen, Louis Milne Equalisers Data directed estimation Turbo equalisation MIL-STD-188-110D (Appendix D) High frequency UCTD Dissertation (MEng (Electronic Engineering))--University of Pretoria, 2021. Conventional receivers for high-frequency (HF) waveforms using phase-shift keying (PSK) or quadrature amplitude modulation (QAM) symbol mapping contain an equaliser to equalise channel effects and a forward error correction (FEC) decoder to improve bit error rate (BER) performance at low signal-to-noise ratios (SNRs). The equaliser is an important component of an HF waveform receiver since the ionospheric channel used for skywave propagation commonly causes a signal to propagate along multiple paths which often results in inter-symbol interference (ISI) at the receiver. Turbo equalisation, which is the process of feeding back information from the decoder to the equaliser to improve symbol estimates, has been shown to improve the performance of a receiver when ISI is present in the channel. Turbo data directed estimation (TDDE) is a turbo equalisation method based on the data directed estimation (DDE) equaliser which is suited for waveforms that interleave known symbol sections, used for channel estimation, with the unknown data symbols.In this work, the TDDE algorithm is applied to standardised MIL-STD-188-110D Appendix D (MIL-STD-188-110D App. D) HF waveforms. This standard was selected since it is still relevant and actively being maintained and updated. The 3 kHz bandwidth variants of the low data rate waveforms in MIL-STD-188-110D App. D, referred to as waveform number 1 and waveform number 2, were studied in this work since it was expected that it would be more challenging to improve the performance of these waveforms than the less robust and higher data rate waveforms with denser constellations. The designed TDDE receiver was tested using the methods specified in MIL-STD-188-110D App. D and using equipment from a reliable supplier of HF communications equipment, Rapid Mobile (Pty) Ltd (RapidM). The tests showed promising results for the TDDE algorithm when applied to MIL-STD-188-110D App. D waveform number 1 and waveform number 2, with consistent performance improvements in the order of 2 dB when using a Poor channel as defined in MIL-STD-188-110D App. D. Permutations of the TDDE algorithm were also experimented with in this work, but none provided substantial changes in performance. Electrical, Electronic and Computer Engineering MEng (Electronic Engineering) Unrestricted 2022-02-11T08:11:31Z 2022-02-11T08:11:31Z 2022-05-04 2021 Dissertation * A2022 http://hdl.handle.net/2263/83797 en © 2022 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 | Equalisers Data directed estimation Turbo equalisation MIL-STD-188-110D (Appendix D) High frequency UCTD Turbo equalisation based on data directed estimation for standard high frequency waveforms |
| title | Turbo equalisation based on data directed estimation for standard high frequency waveforms |
| title_full | Turbo equalisation based on data directed estimation for standard high frequency waveforms |
| title_fullStr | Turbo equalisation based on data directed estimation for standard high frequency waveforms |
| title_full_unstemmed | Turbo equalisation based on data directed estimation for standard high frequency waveforms |
| title_short | Turbo equalisation based on data directed estimation for standard high frequency waveforms |
| title_sort | turbo equalisation based on data directed estimation for standard high frequency waveforms |
| topic | Equalisers Data directed estimation Turbo equalisation MIL-STD-188-110D (Appendix D) High frequency UCTD |
| url | http://hdl.handle.net/2263/83797 |