Patent ID: 8363737
Filing Date: 2013-01-29
Classification: G06K

Abstract:
1. A method comprising: receiving a carrier signal transmitted by a base station according to either a first data-transmission protocol or a second data-transmission protocol; detecting a first field gap in the carrier signal indicating initiation of a data transmission by the base station; determining whether a reference duration is present in the carrier signal after the first field gap, presence of the reference duration in the carrier signal after the first field gap indicating use of the first data-transmission protocol for the data transmission, absence of the reference duration from the carrier signal after the first field gap indicating use of the second data-transmission protocol for the data transmission; if the reference duration is present in the carrier signal after the first field gap then, according to the first data-transmission protocol: if the reference duration is absent from the carrier signal after the first field gap then, according to the second data-transmission protocol, decoding the data transmission by measuring durations between successive subsequent field gaps and determining whether each duration as measured is a binary 1 or binary 0 based on a pre-stored value; and detecting a termination of the data transmission when a duration between successive subsequent field gaps exceeds a pre-stored maximum duration value.