Enhanced data detection in OFDM systems using factor graph
In OFDM systems, the cyclic prefix (CP) eliminates the interblock interference and enables the use of the computationally efficient single-tap equalizers at the receiver. While posing a loss in both spectrum efficiency and power efficiency, the CP brings extra information about the data which can be...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Conference Paper |
| Published: |
Institute of Electrical and Electronic Engineers, Inc
2013
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/21675 |
| _version_ | 1848750656266960896 |
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| author | Yang, J. Guo, Q. Huang, D. Nordholm, Sven |
| author2 | Not known |
| author_facet | Not known Yang, J. Guo, Q. Huang, D. Nordholm, Sven |
| author_sort | Yang, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In OFDM systems, the cyclic prefix (CP) eliminates the interblock interference and enables the use of the computationally efficient single-tap equalizers at the receiver. While posing a loss in both spectrum efficiency and power efficiency, the CP brings extra information about the data which can be used for detection. Therefore, instead of discarding the CP as in the conventional OFDM systems, this paper takes advantage of the prefix redundancy and utilizes it in the soft-input soft-output equalizer of a turbo equalization system. By using factor graph, an equalization algorithm is developed, and with proper approximation, the complexity of the proposed algorithm is reduced to O(2Rlog2N + 4RG/N log2G + 2RG/N) per data symbol for R iterations, where N is the length of the block and G is equal to P + L - 1 with P the CP length and L the channel length. Simulation results show that the turbo equalization system converges within two iterations and the proposed equalization approach achieves significant gain compared to the conventional approach. |
| first_indexed | 2025-11-14T07:40:18Z |
| format | Conference Paper |
| id | curtin-20.500.11937-21675 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:40:18Z |
| publishDate | 2013 |
| publisher | Institute of Electrical and Electronic Engineers, Inc |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-216752017-09-13T13:53:06Z Enhanced data detection in OFDM systems using factor graph Yang, J. Guo, Q. Huang, D. Nordholm, Sven Not known OFDM system factor graph iterative receiver cyclic prefix In OFDM systems, the cyclic prefix (CP) eliminates the interblock interference and enables the use of the computationally efficient single-tap equalizers at the receiver. While posing a loss in both spectrum efficiency and power efficiency, the CP brings extra information about the data which can be used for detection. Therefore, instead of discarding the CP as in the conventional OFDM systems, this paper takes advantage of the prefix redundancy and utilizes it in the soft-input soft-output equalizer of a turbo equalization system. By using factor graph, an equalization algorithm is developed, and with proper approximation, the complexity of the proposed algorithm is reduced to O(2Rlog2N + 4RG/N log2G + 2RG/N) per data symbol for R iterations, where N is the length of the block and G is equal to P + L - 1 with P the CP length and L the channel length. Simulation results show that the turbo equalization system converges within two iterations and the proposed equalization approach achieves significant gain compared to the conventional approach. 2013 Conference Paper http://hdl.handle.net/20.500.11937/21675 10.1109/WCSP.2013.6677025 Institute of Electrical and Electronic Engineers, Inc restricted |
| spellingShingle | OFDM system factor graph iterative receiver cyclic prefix Yang, J. Guo, Q. Huang, D. Nordholm, Sven Enhanced data detection in OFDM systems using factor graph |
| title | Enhanced data detection in OFDM systems using factor graph |
| title_full | Enhanced data detection in OFDM systems using factor graph |
| title_fullStr | Enhanced data detection in OFDM systems using factor graph |
| title_full_unstemmed | Enhanced data detection in OFDM systems using factor graph |
| title_short | Enhanced data detection in OFDM systems using factor graph |
| title_sort | enhanced data detection in ofdm systems using factor graph |
| topic | OFDM system factor graph iterative receiver cyclic prefix |
| url | http://hdl.handle.net/20.500.11937/21675 |