Efficient Constant Modulus Based Carrier Frequency Offset Estimation for CO-OFDM Systems

Muyiwa B. Balogun, Olutayo O. Oyerinde, Fambirai Takawira

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

This paper proposes a blind carrier frequency offset (CFO) estimation method for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems, using constant modulus signaling. The proposed scheme is based on a robust cost-function, which deviates from the common assumption that the channel frequency response slowly varies either in time or frequency domain. The proposed method adopts a cost-function similar to the Godard's method for blind channel equalization. Using Monte Carlo simulations, the proposed method is shown to offer a superior performance compared to prominent existing methods, in a practical optical link scenario. Also, we show that the proposed cost-function can be approximated and expressed in a closed-form in such a way that the CFO estimate is obtained using only three trial values.

Original languageEnglish
Article number8000568
JournalIEEE Photonics Journal
Volume9
Issue number5
DOIs
StatePublished - 1 Oct 2017
Externally publishedYes

Keywords

  • blind estimation
  • carrier frequency offset
  • CO-OFDM
  • constant modulus.

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