Frame Synchronization Exploiting Cauchy Distribution in DMT-Based xDSL Modems

Youngok KIM  Jaekwon KIM  Joonhyuk KANG  Baxter F. WOMACK  

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B   No.4   pp.1668-1671
Publication Date: 2005/04/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.4.1668
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment for Communications
Keyword: 
Cauchy distribution,  sampling frequency offset,  sampling phase offset,  non-synchronized sampling,  

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Summary: 
This letter considers frame synchronization in non-synchronized sampling discrete multi-tone (DMT) based asymmetric digital subscriber line (ADSL)/very high speed DSL (VDSL) systems in the presence of timing error. We propose a frame synchronization method which is based on the observation that the normalized correlation between two sequences separated by the FFT length is Cauchy random variable. The proposed approach uses less number of correlators, reducing computational complexity as well as demodulation delay than a previous approach. Therefore, ADSL/VDSL modems can be more power efficient and computationally less complex via the proposed frame synchronization method. Simulation results demonstrate the effectiveness of the proposed approach, comparing with the previous approach.