| 摘要 |
PURPOSE:To provide the OFDM signal demodulator having an inexpensive OFDM reception AFC device. CONSTITUTION:A signal of the OFDM (orthogonal frequency multiplexing) modulation system to be sent is orthogonally detected by multipliers 101, 102, which provide respectively I and Q axis components, and they are digitized and demodulated by a serial parallel converter 106, an FFT computing element 107, a parallel serial converter 108, and a delay detector 118 via a guard period eliminating device 105. A path comprising a selector 109, power calculation devices 110, 111, a fading elimination device 112, a comparator 113, a D/A converter 114 and a VCXO 115 forms an AFC loop. |
