| 摘要 |
PROBLEM TO BE SOLVED: To realize stable loopback transmission operation in a video signal transmission system which performs main line transmission from a terminal side to a base station side and loopback transmission from the base station side to the terminal side by radio communication.SOLUTION: Power/transmission delay detection part 3 of a base station device 2 obtains an amount of delay using a start position of an OFDM frame as its reference position, using a received IF signal within received IF signals 1 and 2 on the basis of their synchronization information, and determines transmission timing so as to receive OFDM signals, corresponding to transmission IF signals 1 to 4, within an allowable delay amount S equal to GI length or less at terminal side. A delay compensation part 5 compensates transmission timing of the transmission IF signals 1 to 4 so as to be the transmission timing determined by the power/transmission delay detection part 3. Therefore, no inter-symbol interference occurs since a terminal device 200-1 receives each OFDM signal transmitted from high frequency parts 30-1 and 30-2 at the timing where delays of the OFDM signals fall into the allowable delay amount S equal to GI length or less. |
