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- W2949548543 abstract "A practical WiFi system only achieves a discrete data rate adjustment due to hardware constraints while channel signal-to-noise ratio (SNR) is continuous. This mismatch leads to the SNR gaps. In this paper, we introduce a novel communication mechanism, CoS ( Co mmunication through S ilent subcarriers), which turns the wasted SNR gaps into new opportunities for transmitting control messages for free. Compared with traditional piggybacking schemes, CoS is more reliable to transmit control messages from one node to many nodes. In CoS, silent subcarriers are inserted into data packets and the intervals between adjacent silent subcarriers are utilized to encode information. Since the wasted SNR gap results in under-utilization of the channel code, the data bit errors induced by silent subcarriers are corrected by the correcting capability of the existing channel code as long as we carefully design the total number of inserted silent subcarriers. Based on CoS, we design CoS-MAC to validate the effectiveness of CoS. We measure the throughput of free control messages achieved by CoS under various channel conditions and conduct simulations to show the throughput gain achieved by CoS-MAC over the existing schemes." @default.
- W2949548543 created "2019-06-27" @default.
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- W2949548543 date "2020-10-01" @default.
- W2949548543 modified "2023-10-08" @default.
- W2949548543 title "Turning Waste into Wealth: Free Control Message Transmissions in Indoor WiFi Networks" @default.
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- W2949548543 doi "https://doi.org/10.1109/tmc.2019.2924000" @default.
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