TDMA SYSTEM RECEIVER

Japanese Patent JP3482722

B2

PURPOSE: To detect a carrier frequency offset of a reception signal in an excellent way by detecting the offset of carrier frequency based on a phase difference detected from two burst data.
CONSTITUTION: In a stage that burst signals b1, b2 are stored in a memory 111 in a demodulation section 110, an arithmetic section 114 calculates a correlation function between synchronization bit data stored in advance in a memory 112 and reception data. The square of the absolute value of the obtained correlation function is obtained and data of I and Q components where the energy of correlation is maximized are selected from the memory 111 based on the square of the absolute value of the correlation function. Data of the I and Q components where the energy of correlation is maximized are read from the memory 113 and the phase of the IQ components this time is compared with that of the preceding IQ components. The phase difference is discriminated to be an offset of the carrier frequency to update a frequency correction for the arithmetic operation in an arithmetic section 114. The data of the I and Q components where the energy of correlation in a synchronization bit of a frame burst signal is maximized are stored in the memory 113 to be used for succeeding correction processing.

Seiichi Izumi

JP430895A

January 06, 2004

January 13, 1995

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ソニー株式会社

H04L27/22; H04B7/212; H04B7/26; H04J3/00; H04W56/00; H04L7/04; (IPC1-7): H04L27/22; H04J3/00; H04Q7/38

JP832641A
JP5252218A
JP3128550A
JP6311075A
JP4298143A
JP870288A
JP6508244A

Yoshisue Kakuda (2 outside)

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