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| In this paper, we investigate the carrier sensing range (CSR) of ageneral 802.11 network with physical-layer network coding (PNC). Weaim to derive a sufficient CSR that can prevent the hidden-nodecollisions in a general 802.11 PNC network. The analysis includestwo steps. First, we analyze the six link-to-link interference casesin an 802.11 PNC network to show that the mutual interference willbe most severe when each node in the network initiates a two-hop endnode link. Second, we consider the worst interference case that allconcurrently transmitting links in the network are two-hop end nodelinks and placed in the densest manner, and develop a closed-formexpression of a sufficient CSR that prevents the hidden-nodecollisions in a PNC network. From the analysis results, we find thatto prevent the hidden-node collisions, the CSR in PNC network shouldbe bigger than the one in traditional non-network-coding (NNC)network. Furthermore, we carry out extensive simulations to find outthe throughput gain of PNC scheme in a general wireless network whenconsidering the impact of CSR. Simulation results show that comparedwith the NNC scheme, PNC scheme has throughput gain when a largeproportion (i.e. 90%) of links in the network are two-hop links andthe link density has little effect on the throughput gain of PNCscheme. |
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| Keywords:Communication and Informationsystem, Physical-layer network coding, Carrier sensing range analysis, Throughput gain. |
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