| 摘要 |
PROBLEM TO BE SOLVED: To obtain a communication system capable of reducing transmission stop time for a secondary user.SOLUTION: A communication system comprises: a primary user device; a secondary user device for performing transmission in the same frequency band as that of the primary user device; and a sensing unit for detecting a transmission signal transmitted from the primary user device in the frequency band. A transmission unit 2 of the secondary user device comprises a ZP addition unit 24 for adding a ZP section as a guard interval section. The sensing unit comprises a signal detection unit for detecting the transmission signal from the primary user device on the basis of a reception signal in the ZP section. |
