FIELD: radio engineering, communication.
SUBSTANCE: invention relates to transmitting and receiving data using multiple frequencies. Measurement of communication quality using a broadband signal and transmission and reception of data using a predetermined frequency band are carried out at approximately the same time. The transmitting device (1) is capable of transmitting data at a first frequency and a second frequency to a receiving device (2). The transmitter (1a) of the transmitting device (1) transmits a predetermined broadband signal in a first period of time in a frequency band which does not include the first frequency, and in a second period of time in a frequency band which does not include the second frequency. The quality measuring unit (2a) of the receiving device (2) measures quality of communication with the transmitting device (1) based on the broadband signal received in the first and second periods of time.
EFFECT: preventing quality degradation when transmitting and receiving data.
3 cl, 21 dwg
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