Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing
This paper considers the coded OFDM system and instead of discarding the cyclic prefix (CP) at the receiver, we utilize the CP observation for joint detection, decoding and channel estimation. In particular, detection and decoding are performed iteratively between an equalizer and a soft-input soft-...
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Conference Paper |
| Published: |
IEEE
2014
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/31382 |
| _version_ | 1848753364779663360 |
|---|---|
| author | Yang, J. Guo, Q. Huang, D. Nordholm, Sven |
| author2 | Abbas Jamalipour |
| author_facet | Abbas Jamalipour Yang, J. Guo, Q. Huang, D. Nordholm, Sven |
| author_sort | Yang, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This paper considers the coded OFDM system and instead of discarding the cyclic prefix (CP) at the receiver, we utilize the CP observation for joint detection, decoding and channel estimation. In particular, detection and decoding are performed iteratively between an equalizer and a soft-input soft-output (SISO) decoder based on the turbo principle, and the expectation-maximization (EM) algorithm is employed in the equalizer for joint detection and channel estimation via message passing. Models for the CP observation, non-CP observation and the time correlation of the time-varying channel are presented in Forney-style factor graphs (FFGs), and a scheduling scheme is proposed to pass messages between the graphs. Simulation results show that with unknown channel impulse response (CIR), the performance of the proposed algorithm approaches the case where CIR is perfectly known and through proper exploitation of the CP, the proposed algorithm outperforms the conventional algorithm (i.e. CP is discarded) with known CIR, as well as the alternative algorithm in the literature (where CP is exploited) with unknown CIR. |
| first_indexed | 2025-11-14T08:23:21Z |
| format | Conference Paper |
| id | curtin-20.500.11937-31382 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:23:21Z |
| publishDate | 2014 |
| publisher | IEEE |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-313822023-02-27T07:34:31Z Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing Yang, J. Guo, Q. Huang, D. Nordholm, Sven Abbas Jamalipour Der-Jiunn Deng OFDM system factor graph iterative receiver EM algorithm cyclic prefix This paper considers the coded OFDM system and instead of discarding the cyclic prefix (CP) at the receiver, we utilize the CP observation for joint detection, decoding and channel estimation. In particular, detection and decoding are performed iteratively between an equalizer and a soft-input soft-output (SISO) decoder based on the turbo principle, and the expectation-maximization (EM) algorithm is employed in the equalizer for joint detection and channel estimation via message passing. Models for the CP observation, non-CP observation and the time correlation of the time-varying channel are presented in Forney-style factor graphs (FFGs), and a scheduling scheme is proposed to pass messages between the graphs. Simulation results show that with unknown channel impulse response (CIR), the performance of the proposed algorithm approaches the case where CIR is perfectly known and through proper exploitation of the CP, the proposed algorithm outperforms the conventional algorithm (i.e. CP is discarded) with known CIR, as well as the alternative algorithm in the literature (where CP is exploited) with unknown CIR. 2014 Conference Paper http://hdl.handle.net/20.500.11937/31382 10.1109/ICC.2014.6884059 IEEE restricted |
| spellingShingle | OFDM system factor graph iterative receiver EM algorithm cyclic prefix Yang, J. Guo, Q. Huang, D. Nordholm, Sven Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing |
| title | Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing |
| title_full | Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing |
| title_fullStr | Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing |
| title_full_unstemmed | Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing |
| title_short | Exploiting cyclic prefix for joint detection, decoding and channel estimation in OFDM via EM algorithm and message passing |
| title_sort | exploiting cyclic prefix for joint detection, decoding and channel estimation in ofdm via em algorithm and message passing |
| topic | OFDM system factor graph iterative receiver EM algorithm cyclic prefix |
| url | http://hdl.handle.net/20.500.11937/31382 |