Synchronization of OFDM signals with improved windowing

Details Synchronization of OFDM signals with improved windowing Synchronization of OFDM signals with improved windowing

1999-04-26

2000-06-13

Vo, Don N.

Excavating

375260, 375343, H04L 2536, H04L 2540, H04L 700

Patent

active

060740868

ABSTRACT:
A mechanism for determining phases of a symbol for phase correlation is provided. The mechanism performs a symmetric apodizing window function on a symbol sample of a symbol having a symbol period of T and a time-offset symbol symbol sample offset from the symbol sample by T/2 to produce first windowed values for the symbol sample and second windowed values for the time-offset symbol sample. The mechanism applies a time shift to re-align the time-offset symbol sample with the symbol sample and sums the second windowed values and the corresponding first windowed values. The summed values are then converted to phases. The symmetric apodizing window function is an apodizing window function having the property W.sub.j +W.sub.(FFTSize,/2+j) =constant, where FFTSize is the size of the FFT sample. The symmetric apodizing window function, such as a Hanning window, may be performed in the time or frequency domain.

REFERENCES:
patent: 4057762 (1977-11-01), Namiki
patent: 4438511 (1984-03-01), Baran
patent: 5282222 (1994-01-01), Fattouche et al.
patent: 5444697 (1995-08-01), Leung et al.
patent: 5450456 (1995-09-01), Mueller
patent: 5471464 (1995-11-01), Ikeda
patent: 5488632 (1996-01-01), Mason et al.
patent: 5506836 (1996-04-01), Ikeda et al.
patent: 5546429 (1996-08-01), Chiasson et al.
patent: 5550812 (1996-08-01), Philips
patent: 5555268 (1996-09-01), Fattouche et al.
patent: 5559833 (1996-09-01), Hayet
patent: 5596582 (1997-01-01), Sato et al.
patent: 5596604 (1997-01-01), Cioffi et al.
patent: 5602835 (1997-02-01), Seki et al.
patent: 5608764 (1997-03-01), Sugita et al.
patent: 5610908 (1997-03-01), Shelswell et al.
patent: 5627863 (1997-05-01), Aslanis et al.
patent: 5636224 (1997-06-01), Voith et al.
patent: 5652772 (1997-07-01), Isaksson et al.
patent: 5682376 (1997-10-01), Hayashino et al.
patent: 5694389 (1997-12-01), Seki et al.
patent: 5726973 (1998-03-01), Isaksson
patent: 5732113 (1998-03-01), Schmidl et al.
patent: 5774450 (1998-06-01), Harada et al.
patent: 5802117 (1998-09-01), Ghosh
patent: 5812523 (1998-09-01), Isaksson et al.
patent: 5889759 (1999-03-01), McGibney
patent: 5901180 (1999-05-01), Aslanis et al.
patent: 5914931 (1999-06-01), Kang et al.
Cioffi et al., "Very-High-Speed Digital Subscriber Lines," IEEE Communications Magazine, vol. 37, No. 4, pp. 72-79 (Apr. 1999).
Edfors et al., "An introduction to orthogonal frequency-division multiplexing," (Sep. 1996).
Sandell et al., "Timing and Frequency Synchronization in OFDM Systems Using the Cyclic Prefix," Div. of Signal Processing, Lulea Univ. of Tech., S-971 87, Lulea, Sweden (no date).
Schmidl et al., "Robust Frequency and Timing Synchronization for OFDM," IEEE Trans. on Communication, vol. 45, No. 12, pp. 1613-1621 (Dec. 1997).
Synchronization Bursts--Chapter 4, http:.backslash..backslash.www.sce.carleton.ca/.about.Laszlo.Hazy/OFDM/bur sts.html (Sep. 23, 1998).
van der Beek et al., "Low-Complex Frame Synchronization in OFDM Systems," Div. of Signal Processing, Lulea Univ. of Technology, S-971 87, Lulea, Sweden (1995).
van der Beek et al., "On Synchronization in OFDM Systems Using the Cyclic Prefix," Div. of Signal Processing, Lulea Univ. of Technology, S-971 87, Lulea, Sweden (no date).

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