一般IEEE 802.11物理层网络编码网络中载波侦听范围分析
arrier sensing range analysis in a general IEEE 802.11network with physical-layer network coding
在这篇文章中,我们研究一般IEEE 802.11物理层网络编码网络的载波侦听范围。我们旨在推导出可以避免IEEE 802.11物理层网络编码网络隐藏节点问题的充分载波侦听范围表达式。分析分两个步骤进行: 首先,我们通过分析物理层网络编码网络中六种可能的链路间干扰场景,从而得出当所有节点发起一个两跳终端链路时,链路间的相互干扰最大。其次,我们考虑网络中所有链路均是两跳终端链路且处于最紧凑放置的情况,推导出闭合的可以避免物理层网络编码网络隐藏节点问题的充分载波侦听范围表达式。此外,从分析结果可知,为了避免隐藏节点问题,物理层网络编码网络的载波侦听范围必须大于无网络编码网络的载波侦听范围。因此,我们通过仿真进一步研究在考虑载波侦听范围影响时物理层网络编码的吞吐量增益。仿真结果表明:物理层网络编码只有在网络中大部分链路是两跳链路时才可以获得吞吐量增益;而且,吞吐量增益与链路密度无关。
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.
石江宏、林世俊
无线通信通信
通信与信息系统物理层网络编码载波侦听范围分析吞吐量增益
ommunication and Informationsystem Physical-layer network coding Carrier sensing range analysis Throughput gain.
石江宏,林世俊.一般IEEE 802.11物理层网络编码网络中载波侦听范围分析[EB/OL].(2014-07-22)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/201407-272.点此复制
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