Delayed Correlation Based Signal Detection Scheme with Filter Bank for OFDM Signal

Hiroyuki ODANI  Shoya UCHIDA  Ryo TAKAI  Yukitoshi SANADA  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.7   pp.1381-1389
Publication Date: 2015/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.1381
Type of Manuscript: PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
spectrum sensing,  delayed correlation,  

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Delayed correlation has been used to detect orthogonal frequency division multiplexing symbols with cyclic prefix in spectrum sensing. Because of the frequency offset, the outputs of the delayed correlation do not lie only on the real axis of a complex plane. Therefore, the absolute value of the outputs of the delayed correlation is employed. Furthermore, with the use of a filter bank, the number of the outputs of the delayed correlators increases and the averaging over the outputs decreases the noise variance. This paper proposes a new delayed correlation scheme that uses a filter bank and employs the absolute of the outputs of delayed correlation. The proposed scheme improves the probability of detection as the number of the branches of the delayed correlators increases. In the case of 6 branches, the proposed scheme reduces the required sample energy by 1dB the probability of detection of 0.9.