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Namely, we focus on systems with large OFDM symbol lengths where design and complexity constraints have to be taken into account and many of the existing ICI reduction techniques can not be applied. We propose a factor graph (FG) based approach for maximum a posteriori (MAP) symbol detection which exploits the frequency diversity introduced by the ICI in the OFDM symbol. The proposed algorithm provides high diversity orders allowing to outperform the free-ICI performance in high-mobility scenarios with an inherent parallel structure suitable for large OFDM block sizes. The performance of the mentioned near-optimal detection strategy is analyzed over a general bit-interleaved coded modulation (BICM) system applying low-density parity-check (LDPC) codes. The inclusion of pilot symbols is also considered in order to analyze how they assist the detection process.<\/jats:p>","DOI":"10.1186\/1687-1499-2012-331","type":"journal-article","created":{"date-parts":[[2012,10,31]],"date-time":"2012-10-31T17:19:40Z","timestamp":1351703980000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Factor graph based detection approach for high-mobility OFDM systems with large FFT modes"],"prefix":"10.1186","volume":"2012","author":[{"given":"Pello","family":"Ochandiano","sequence":"first","affiliation":[]},{"given":"Henk","family":"Wymeersch","sequence":"additional","affiliation":[]},{"given":"Mikel","family":"Mendicute","sequence":"additional","affiliation":[]},{"given":"Lorena","family":"Mart\u00ednez","sequence":"additional","affiliation":[]},{"given":"Iker","family":"Sobr\u00f3n","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2012,10,31]]},"reference":[{"key":"585_CR1","doi-asserted-by":"publisher","first-page":"401","DOI":"10.1109\/26.911445","volume":"49","author":"Y Li","year":"2001","unstructured":"Li Y, Cimini LJ: Bounds on the interchannel interference of OFDM in time-varying impairments. 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