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Successive Interference Cancellation: Carving Out MAC Layer Opportunities
Feb. 2013 (vol. 12 no. 2)
pp. 346-357
S. Sen, Dept. of Comput. Sci., Duke Univ., Durham, UK
N. Santhapuri, Bloomberg, New York, NY, USA
R. R. Choudhury, Electr. & Comput. Eng. Dept., Duke Univ., Durham, NC, USA
S. Nelakuditi, Comput. Sci. & Eng. Dept., Univ. of South Carolina, Columbia, SC, USA
Successive interference cancellation (SIC) is a PHY capability that allows a receiver to decode packets that arrive simultaneously. While the technique is well known in communications literature, emerging software radio platforms are making practical experimentation feasible. This motivates us to study the extent of throughput gains possible with SIC from a MAC layer perspective and scenarios where such gains are worth pursuing. We find that contrary to our initial expectation, the gains are not high when the bits of interfering signals are not known a priori to the receiver. Moreover, we observe that the scope for SIC gets squeezed by the advances in bitrate adaptation. In particular, our analysis shows that interfering one-to-one transmissions benefit less from SIC than scenarios with many-to-one transmissions (such as when clients upload data to a common access point). In view of this, we develop an SIC-aware scheduling algorithm that employs client pairing and power reduction to extract the most gains from SIC. We believe that our findings will be useful guidelines for moving forward with SIC-aware protocol research.
Index Terms:
software radio,access protocols,decoding,interference suppression,radio receivers,SIC-aware protocol research,MAC layer opportunities,successive interference cancellation,PHY capability,receiver,packets decoding,software radio platforms,interfering signals,SIC-aware scheduling algorithm,power reduction,Silicon carbide,Receivers,Transmitters,Bit rate,Interference,Signal to noise ratio,Gain,capacity,Wireless communication,interference cancellation,collision
Citation:
S. Sen, N. Santhapuri, R. R. Choudhury, S. Nelakuditi, "Successive Interference Cancellation: Carving Out MAC Layer Opportunities," IEEE Transactions on Mobile Computing, vol. 12, no. 2, pp. 346-357, Feb. 2013, doi:10.1109/TMC.2012.17
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