Apparatus and method for carrier frequency offset estimation...

Details Apparatus and method for carrier frequency offset estimation... Apparatus and method for carrier frequency offset estimation...

2005-12-21

2010-06-15

Nguyen, Steven H (Department: 2474)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C375S331000

Reexamination Certificate

active

07738357

ABSTRACT:
A method is disclosed for correcting carrier frequency offset (CFO) in a received data packet that includes one or more M data streams. The data packet has a payload portion preceded by a preamble portion, the payload portion having a plurality of data symbols (L) each of which include a plurality of data tones (K). The method comprises, making a per-stream preamble CFO estimate for each data stream by correlating repeated preamble portions that precede the data packet. The per-stream preamble CFO estimates are weighted and averaged to obtain a single preamble CFO estimate. Any CFO in each received data stream is then corrected according to the preamble CFO estimate. Additionally, for an lthdata symbol in a data packet, a per-tone CFO estimate is derived and successively averaged over frequency (tones), time (symbols) and space (data steams) to derive data CFO estimate pdata. Any CFO in each received data stream may be corrected according to the data CFO estimate, and/or the preamble CFO estimate.

REFERENCES:
patent: 6522703 (2003-02-01), Cueff et al.
patent: 6738375 (2004-05-01), Okanoue
patent: 7139340 (2006-11-01), Scarpa
patent: 7308053 (2007-12-01), Yousef et al.

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