Skip-Correlation for Multi-Power Wireless Carrier Sensing


Romil Bhardwaj, Krishna Chintalapudi, and Ramachandran Ramjee, Microsoft Research


Carrier sensing is a key mechanism that enables decentralized sharing of unlicensed spectrum. However, carrier sensing in its current form is fundamentally unsuitable when devices transmit at different power levels, a scenario increasingly common given the diversity of Wi-Fi APs in the market and the need for Wi- Fi’s co-existence with new upcoming standards such as LAA/LWA. The primary contribution of this paper is a novel carrier sensing mechanism – skip correlation – that extends carrier sensing to accommodate multiple transmit power levels. Through an FPGA based implementation on the WARP platform, we demonstrate the effectiveness of our technique in a variety of scenarios including support for backward compatibility.

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@inproceedings {201461,
author = {Romil Bhardwaj and Krishna Chintalapudi and Ramachandran Ramjee},
title = {{Skip-Correlation} for {Multi-Power} Wireless Carrier Sensing},
booktitle = {14th USENIX Symposium on Networked Systems Design and Implementation (NSDI 17)},
year = {2017},
isbn = {978-1-931971-37-9},
address = {Boston, MA},
pages = {227--242},
url = {},
publisher = {USENIX Association},
month = mar

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