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Conventional WiFi networks perform channel contention in time domain. This is known to be wasteful because the channel is forced to remain idle while all contending nodes are backing off for multiple time slots. This paper proposes to break away from convention and recreate the backing off operation in the frequency domain. Our basic idea leverages the observation that OFDM subcarriers can be treated as integer numbers. Thus, instead of picking a random backoff duration in time, a contendingdoi:10.1145/2030613.2030641 dblp:conf/mobicom/SenCN11 fatcat:voohmmihlnexrjd7baqwnpen4i