| CPC H04W 74/0816 (2013.01) [H04W 72/1263 (2013.01); H04W 74/0866 (2013.01)] | 18 Claims |

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1. A method, comprising:
performing, by a first wireless communication device, according to a duty cycle, a listen-before-talk (LBT) operation on a channel between the first wireless communication device and a second device to determine that the channel is available, prior to transmitting a first signal comprising a first chirp of a plurality of chirps of a data burst; and
transmitting, by the first wireless communication device, the first signal on the channel responsive to performing the LBT operation.
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