Methods and arrangements to determine a reception of a signal

Details Methods and arrangements to determine a reception of a signal Methods and arrangements to determine a reception of a signal

2007-04-30

2010-11-30

Edouard, Patrick N (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S210000, C370S203000, C370S310000

Reexamination Certificate

active

07843872

ABSTRACT:
Methods and arrangements for wireless communications are described. Embodiments include transformations, code, state machines or other logic to receive from a transmitter a signal representing a known sequence of symbols. The signal may be transmitted over a plurality of sub channels. The embodiments may also include determining channel responses at the sub channels and determining a reception of the known sequence. The determining may include treating the channel responses at the sub channels in a differential manner to cancel out channel phase responses and obtain channel amplitudes. In some embodiments, the cancelling may be performed by multiplying frequency domain values representing reception of a sub channel by the complex conjugate of frequency domain values of a neighboring sub channel. Many embodiments may also include calculating a carrier to interference and noise ratio (CINR) of the signal. In several embodiments, the signal may represent the preamble of a wireless frame.

REFERENCES:
patent: 7095779 (2006-08-01), Karlsson
patent: 7606139 (2009-10-01), Bick et al.
patent: 2005/0265489 (2005-12-01), Chang et al.
patent: 2006/0256885 (2006-11-01), Song
patent: 2007/0149197 (2007-06-01), Lee et al.
patent: 2007/0217552 (2007-09-01), Lee et al.
USPTO application filed Dec. 6, 2006; U.S. Appl. No. 11/635,886; Preamble Detection Using Frequency Based Correlation; first named inventor Eyal Bick.

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