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

Claim 11:
12. A communication node using OFDM (Orthogonal Frequency Division Multiplexing), wherein packets are transmitted and received between the communication node and a further communication node, each packet comprises a preamble and payload data, and said communication node comprises:
a communication interface for receiving packets from the further communication node; and
an authenticator for extracting a plurality of preambles from a group of consecutively received packets, and authenticating the further communication 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.