| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve transmission efficiency by optimizing an insertion rate of a pilot signal for a wireless microphone system. <P>SOLUTION: A wireless microphone OFDM transmitter 1 comprises: a carrier modulation part 142 generating a carrier modulation signal by mapping a digital voice signal to an IQ plane for each carrier; and an OFDM frame configuration part 143 generating an OFDM segment frame by inserting and arranging a pilot signal into the carrier modulation signal. The OFDM frame configuration part 143 sets an insertion interval of the pilot signal in a symbol direction so that the value resulting from multiplying the insertion interval of the pilot signal in the symbol direction by effective symbol length of an OFDM signal is equal to or smaller than 1/100 of a fading period, and sets an insertion interval of the pilot signal in a carrier direction so that the insertion interval of the pilot signal in the carrier direction is equal to or smaller than the value resulting from multiplying the insertion interval of the pilot signal in the symbol direction by the value resulting from dividing the effective symbol length of the OFDM signal by maximum delay time of a reflection wave. <P>COPYRIGHT: (C)2013,JPO&INPIT |
