A method comprising: receiving at a first node a plurality of signals from a plurality of nodes; determining a plurality of carrier frequency offsets for the plurality of nodes, wherein at least one carrier frequency offset of the plurality of carrier frequency offsets is different than another carrier frequency offset of the plurality of carrier frequency offsets; determining an average of the plurality of carrier frequency offsets; adjusting a local oscillator at the first node based on the average of the plurality of carrier frequency offsets; and transmitting data from the first node to one of the plurality of nodes according to a timing determined by the local oscillator.
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