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In the particular case of orthogonal frequency division multiplexing (OFDM) transmission, many previous spectrum sensing algorithms have utilized the unique correlation properties provided by the cyclic prefix (CP). However, they have also had to both estimate and compensate for the inherent timing offset of a practical system. This is because the timing offset will affect both the test statistic and the threshold, and the inaccurate estimation of timing offset will lead to poor performance. So in this paper, we propose an improved CP detector by constructing a likelihood ratio test (LRT) based on the multivariate probability density functions (pdf) of a particular auto-correlation vector that is chosen to exploit the existence of the CP. This leads to \u2018probability of detection\u2019 (<jats:italic>P<\/jats:italic>\n            <jats:sub>\n              <jats:italic>d<\/jats:italic>\n            <\/jats:sub>) and \u2018probability of false alarm\u2019 (<jats:italic>P<\/jats:italic>\n            <jats:sub>\n              <jats:italic>f<\/jats:italic>\n            <\/jats:sub>) terms that are actually independent of timing offset, and we can get an accurate threshold without estimating timing offset. Simulation results illustrate that the proposed algorithm outperforms existing methods, even for low SNR values. Finally, we show how the algorithm\u2019s parameters must be carefully chosen in a trade-off between spectrum sensing success and overall system performance.<\/jats:p>","DOI":"10.1186\/1687-1499-2014-224","type":"journal-article","created":{"date-parts":[[2015,6,18]],"date-time":"2015-06-18T07:02:17Z","timestamp":1434610937000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Improved spectrum sensing for OFDM cognitive radio in the presence of timing offset"],"prefix":"10.1186","volume":"2014","author":[{"given":"Zhenguo","family":"Shi","sequence":"first","affiliation":[]},{"given":"Des","family":"McLernon","sequence":"additional","affiliation":[]},{"given":"Mounir","family":"Ghogho","sequence":"additional","affiliation":[]},{"given":"Zhilu","family":"Wu","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2014,12,19]]},"reference":[{"key":"1025_CR1","doi-asserted-by":"publisher","first-page":"812","DOI":"10.1109\/CECNet.2012.6201639","volume-title":"Consumer Electronics, Communications and Networks (CECNet), 2012 2nd International Conference On","author":"D Tian","year":"2012","unstructured":"Tian D, Zheng L, Wang J, Zhao L: A new spectrum sensing method for OFDM-based cognitive radios. 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