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Frequency Offset Estimation Scheme in the Presence of Time-Varying DC Offset for OFDM Direct Conversion Receivers Mamiko INAMORI Anas Muhamad BOSTAMAM Yukitoshi SANADA Hideki MINAMI Publication IEICE TRANSACTIONS on Communications Vol.E90-B No.10 pp.2884-2890 Publication Date: 2007/10/01 Online ISSN: 1745-1345 DOI: 10.1093/ietcom/e90-b.10.2884 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: direct conversion, OFDM, DC offset, frequency offset, training sequence, Full Text: PDF(515KB)>>
Summary: This paper presents a frequency offset estimation scheme for Orthogonal Frequency Division Multiplex (OFDM) direct conversion receivers. The key idea is to use a differential filter for reduction of DC offset. Frequency offset is estimated in the presence of time-varying DC offset. In order to overcome the varying DC levels under automatic gain control (AGC) circuits, a threshold level is set for the output of the differential filter. The proposed compensation scheme offers superior frequency offset estimation when compared with a conventional scheme with a high pass filter. | |||||
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