Method and apparatus for compensating for residual frequency...

Details Method and apparatus for compensating for residual frequency... Method and apparatus for compensating for residual frequency...

2008-05-20

2008-05-20

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S344000, C375S362000

Reexamination Certificate

active

07376194

ABSTRACT:
Disclosed is a method for compensating for a residual frequency offset in an orthogonal frequency division multiplexing system comprising the steps of: a) performing a fast fourier transform for an input signal to convert the input signal into a serial signal; b) detecting signal power of the serial signal to control the passthrough a signal greater than a predetermined critical value; c) selecting each section of a quadrant for each passed signal; d) estimating a phase error in each section of the quadrant for one orthogonal frequency division multiplexing symbol with respect to the selected section of the quadrant; and e) frequency-oscillating a signal based on the estimated phase error, generating the input signal by multiplying an oscillated signal by a band-passed signal, and then returning to step a).

REFERENCES:
patent: 5694389 (1997-12-01), Seki et al.
patent: 6151369 (2000-11-01), Ohkubo et al.
patent: 6373861 (2002-04-01), Lee
Kim, “A novel residual carrier synchronization technique for M-QAM-OFDM in the presence of intercarrier interference”, 2003 IEEE International Conference on Consumer Electronics, 2003. ICCE, Jun. 17-19, 2003 pp. 232-233.

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