Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2008-05-13
2008-05-13
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C370S319000, C370S335000, C370S337000, C370S344000, C370S347000, C370S441000, C370S442000, C370S445000, C375S148000, C375S260000, C375S349000
Reexamination Certificate
active
07372893
ABSTRACT:
Disclosed is a device and method for compensating for phase distortions in a base station of an OFDMA-based cellular system. The method comprises receiving OFDM symbols from a plurality of mobile stations, canceling a symbol guard interval using a reference timing signal, and performing an FFT (fast Fourier transform) process on the OFDM symbols; dividing the OFDM symbols that have undergone FFT processing into subchannel groups of the mobile stations; restoring phases of the OFDM symbols divided into subchannel groups; and performing channel estimation and equalization on the restored OFDM symbols for each mobile station to thereby perform a demodulation process.
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Kim Young-Hoon
Park Youn-Ok
Blakely & Sokoloff, Taylor & Zafman
Dsouza Adolf
Electronics and Telecommunications Research Institute
Payne David C.
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