METHOD FOR TRANSMITTING ORTHOGONAL FREQUENCY DIVIDING MULTIPLEX SIGNAL, ITS DEVICE AND IDFT ARITHMETIC DEVICE USED THEREFORE

摘要

PROBLEM TO BE SOLVED: To enable reproducing a pilot signal correctly in a receiving device so as to improve the decoding performance of transmitting information by transmitting invariant data where amplitude and a phase are invariant through the use of more than one class of a carrier wave pair which exists in a frequency position which forms a contact with a central carrier wave and also transmitting an information signal through the use of a part of remaining carrier waves. SOLUTION: The carrier waves in a DFDM signal for transmitting the pilot signal are converted into time base signals (an I signal and a Q single) as vectors to be mutually rotated in opposite directions. The combined I signal within the two carrier waves becomes twice as large as an original prescribed value in amplitude and the combined Q signal becomes zero. A I signal component is picked-up at a receiving device side so as to generate a sampling clock. An IDFT arithmetic circuit 4 calculates the reverse discrete Fourier transformation of digital data from an input circuit 2 and also calculates a pilot signal data from a pilot signal data inserting circuit 5 after it is supplied to a prescribed frequency assigning part.