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Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier
Dissertation (MEng)--University of Pretoria, 2009.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613465047203840 |
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| access_status_str | Open Access |
| author2 | Olivier, Jan Corne |
| author_browse | Olivier, Jan Corne |
| author_facet | Olivier, Jan Corne |
| collection | Thesis |
| dc_rights_str_mv | ©University of Pretoria 2008 E1203/ |
| description | Dissertation (MEng)--University of Pretoria, 2009. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/25369 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:34.553Z |
| 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:2263/25369 Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier Olivier, Jan Corne brain.salmon@gmail.com Salmon, Brian Paxton Low-density parity-check codes Density evolution Peak-average power-ratio Wimax UCTD Dissertation (MEng)--University of Pretoria, 2009. In mobile communication, the user’s information is transmitted through a wireless communication link that is subjected to a range of deteriorating effects. The quality of the transmission can be presented by the rate of transfer and the reliability of the received stream. The capacity of the communication link can be reached through the use of channel coding. Channel coding is the method of adding redundant information to the user’s information to mitigate the deteriorating effects of the communication link. Mobile WiMAX is a technology that makes use of orthogonal frequency division multiplexing (OFDM) modulation to transmit information over a wireless communication channel. The OFDM physical layer has a high peak average to power ratio (PAPR) characteristic that saturates the transmitter’s amplifier quite easily when proper backoff is not made in the transmission power. In this dissertation an optimized graph code was used as an alternative solution to improve the system’s performance in the presence of a saturated transmission’s amplifier. The graph code was derived from a degree distribution given by the density evolution algorithm and provided no extra network overhead to implement. The performance analysis resulted in a factor of 10 improvement in the error floor and a coding gain of 1.5 dB. This was all accomplished with impairments provided by the mobile WiMAX standard in the construction of the graph code. Electrical, Electronic and Computer Engineering unrestricted 2013-09-06T21:04:39Z 2009-04-09 2013-09-06T21:04:39Z 2008-09-02 2009-04-09 2009-01-26 Dissertation 2008 E1203/gm http://hdl.handle.net/2263/25369 http://upetd.up.ac.za/thesis/available/etd-01262009-160431/ ©University of Pretoria 2008 E1203/ application/pdf University of Pretoria |
| spellingShingle | Low-density parity-check codes Density evolution Peak-average power-ratio Wimax UCTD Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier |
| title | Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier |
| title_full | Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier |
| title_fullStr | Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier |
| title_full_unstemmed | Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier |
| title_short | Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier |
| title_sort | optimizing ldpc codes for a mobile wimax system with a saturated transmission amplifier |
| topic | Low-density parity-check codes Density evolution Peak-average power-ratio Wimax UCTD |
| url | http://hdl.handle.net/2263/25369 http://upetd.up.ac.za/thesis/available/etd-01262009-160431/ |