Frequency offset correction when decoding a packet encoded...

Details Frequency offset correction when decoding a packet encoded... Frequency offset correction when decoding a packet encoded...

2011-06-28

2011-06-28

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S347000, C375S316000, C375S240270, C370S208000, C714S746000

Reexamination Certificate

active

07970082

ABSTRACT:
Embodiments include frequency offset correction when decoding a packet encoded in a frequency modulated signal. Different symbols encoded in the packet may be corrected by different frequency offsets. In an embodiment, the frequency modulated signal is received on one of the signals of a multi-carrier signal (e.g., based on Orthogonal Frequency Domain Multiplexing, OFDM) and each packet is encoded according to 802.11(a) having the same long sequence repeating multiple times in a header portion. The repetitive sequence is used to compute the different offsets for different symbols.

REFERENCES:
patent: 7123670 (2006-10-01), Gilbert et al.
patent: 7408976 (2008-08-01), Narasimhan et al.
patent: 2005/0058193 (2005-03-01), Saed
patent: 2006/0222095 (2006-10-01), Niu et al.
patent: 2006/0239370 (2006-10-01), Mody et al.
T.M.Schmidl and D.Cox,“Robust frequency and timing synchronization for OFDM”,IEEE Transactions in Communications,pp. 1613-1621,vol. 45, No. 12, Dec. 1997.

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