Patent ID: 11877153
Assignee: HITACHI ENERGY LTD
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 15:
16. A non-transitory computer-readable medium storing instructions that, when executed by a processor of a first node, cause the processor to carry out a communication method using OFDM (Orthogonal Frequency Division Multiplexing) comprising transmitting and receiving packets between the first node and at least one second node, where each packet comprises a preamble and payload data, said communication method comprising:
receiving packets from the at least one second node;
extracting a plurality of preambles from a group of consecutively received packets; and
authenticating the at least one second node based on accumulated deviations in a Channel Impulse Response (CIR) derived from the plurality of preambles, wherein the authenticating comprises
comparing the CIR of the preamble of each packet of the group of consecutively received packets to a reference CIR, and
accumulating the result of the comparisons from all packets of the group as the accumulated deviations.