Patent ID: 11898440
Assignee: RAPTOR DATA LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E  G  H | IPC E  G  H

Claim 19:
20. A method for determining a suitability of a frequency band for data communication with a node by way of a communication channel, the method comprising: transmitting to the node, by way of the communication channel, first and second signals each comprising frequencies in the said frequency band, the first signal comprising a calibration signal and the second signal comprising predetermined reference data; and
receiving, by way of the communication channel, an indication from the node of the suitability of the frequency band for data communication with the node;
wherein receiving the indication of the said suitability of the frequency band for data communication with the node comprises receiving from the node, by way of the communication channel, third and fourth signals having frequencies within a respective frequency band, wherein the third signal comprises a calibration signal and the fourth signal contains the said indication of the suitability of the frequency band for data communication with the node by way of the communication channel;
the method further comprising: determining a calibration function depending on the third signal; processing the fourth signal depending on the calibration function; and determining the indication of the suitability of the frequency band for data communication with the node depending on the processed fourth signal.