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State-space estimation of rapidly-varying carrier frequency offsets in OFDM systems

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2 Author(s)
Nunes, F.D. ; Instituto de Telecomunicacoes, Inst. Superior Tecnico, Lisboa, Portugal ; Leitao, J.M.N.

The problem with the application of parametric algorithms to estimate rapidly varying carrier frequency offsets (CFO) in OFDM systems is that they are rather bandwidth-inefficient as a substantial part of the received signal is occupied with pilot symbols. Herein, we propose to minimize this drawback, i.e., we aim to increase the spacing between pilot symbols by using a truncated Taylor's series to predict the CFO, where the derivatives up to order d-l of the series terms are recursively estimated with a d-order Kalman-Bucy filter (KBF). For large prediction intervals simulations show that the bit error floors can be significantly reduced when the conventional linear non-recursive CFO predictor is replaced with a fourth-order KBF.

Published in:

Signal Processing Advances in Wireless Communications, 2003. SPAWC 2003. 4th IEEE Workshop on

Date of Conference:

15-18 June 2003