Receiver of an orthogonal frequency division multiplexing...

Details Receiver of an orthogonal frequency division multiplexing... Receiver of an orthogonal frequency division multiplexing...

2006-08-29

2006-08-29

Tse, Young T. (Department: 2637)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S210000

Reexamination Certificate

active

07099397

ABSTRACT:
In an orthogonal frequency division multiplexing (OFDM) system, a receiver includes a received signal transformer, a frequency offset estimator and a frequency compensator. The received signal transformer removes from a training symbol a guardtone and a sub-carrier deviated from a mean value of effective sub-carrier signals by over a predetermined value. The frequency offset estimator estimates the frequency offset of the OFDM digital signal and the frequency compensator compensates the frequency offset of received signals by using the estimated frequency offset. Thus, data transmission efficiency can be greatly improved and influence from a frequency-selective noise channel can be minimized. Further, by removing data unnecessary for the frequency offset estimation, the calculation amount can be reduced.

REFERENCES:
patent: 6594320 (2003-07-01), Sayeed
patent: 6839388 (2005-01-01), Vaidyanathan
patent: 6961393 (2005-11-01), Cupo et al.
patent: 2002/0145969 (2002-10-01), Sayeed
patent: 2002/0176520 (2002-11-01), Heegard et al.
patent: 2002/0186799 (2002-12-01), Sayeed

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