OFDM demodulator

Details OFDM demodulator OFDM demodulator

2007-10-30

2007-10-30

Corsaro, Nick (Department: 2617)

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

C370S204000, C375S260000

Reexamination Certificate

active

10505793

ABSTRACT:
An OFDM demodulator includes an FFT circuit, a phase correction circuit, and a timing synchronization circuit. The timing synchronization circuit includes a symbol-boundary calculation circuit to estimate a symbol-boundary position Nx by filtering the correlation peak of a guard interval, symbol-boundary correction circuit to calculate a clock-phase error based on the symbol-boundary position Nx, and a start-flag generation circuit to generate a start flag for the FFT calculation. The symbol-boundary correction circuit subtracts only a value whose precision is smaller than the cycle of a reference clock from the symbol-boundary position Nx, and generates a phase correction signal for each sub-carrier based on the value. The phase correction circuit performs a complex multiplication of the FFF-calculated signal by the phase correction signal to correct the clock-phase error.

REFERENCES:
patent: 2004/0179633 (2004-09-01), Shinoda et al.

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