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In order to accurately analyze the throughput performance of common hopping (CH) multi-channel protocol in IEEE 802.11, the performance analysis model for CH is proposed and mathematical normalized throughput is analyzed. On the basis of new understanding of distributed coordination function mechanism throughput formula under the saturated conditions proposed by Giuseppe Bianchi, the throughput formula...
This paper further researches the affect of actual channel switching delay and short frame on the throughput performance of CCF, and proposes a new method to improve CCF. We discuss two situations that a period without short frame and a period with a short frame, and investigate the affect of short frame sequence of appearance on the CCF performance. To avoid the affect of actual channel switching...
Bayesian Compressive Sensing (BCS) theory with hierarchical Bayesian analysis model is investigated in the process of wideband spectrum detection and data fusion for Cognitive Wireless Sensor Network (C-WSN). A sparse Bayesian reconstruction method is proposed, which is based on the spatial-temporal correlation structure of real non-stationary spectrum signals sensed by multiple cognitive sensor nodes...
The incoming IEEE 802.11s wireless mesh network standard adopts enhanced distributed channel access (EDCA) mechanism as the basic MAC layer access mechanism, and some proposals recommend improving the network allocation vector (NAV) supported by IEEE 802.11 standards. In this paper, the throughput performance of EDCA is compared in the case of full NAV setting and packet by packet NAV setting with...
An efficient anti-jamming piecewise coding based on cognitive OFDM modulation in cognitive radio network (CRN) is proposed in this paper. The optimal design methods of building piecewise code with low redundancy are presented. In cognitive OFDM, anti-jamming piecewise coding could recover the lost packets in parallel interference channels by implementing different number of parity check blocks, thus...
Classifying Internet network traffic flows offers substantial benefits to a number of key areas in network engineering and surveillance. However, as many newly-emerged P2P applications use dynamic port numbers and masquerading techniques, it causes the most challenging problem in network traffic classification. In this paper, we propose a novel multi-levels traffic classification technique that brings...
Common channel framework (CCF), a multi-channel mechanism proposed in 802.11 s, extends traditional DCF mechanism and is fully compatible with traditional 802.11 WLAN. According to the characteristics of CCF reaching maximum throughput in the state of no assigning common channel to transmit data, a method to improve the performance of CCF is proposed. In one collide field, under the condition of fixed...
Accurate and fast identification of network traffic is an important element of many network management tasks such as QoS provisioning and security monitoring. However, as many newly-emerged Peer-to-Peer (P2P) applications using dynamic port numbers, masquerading techniques, and payload encryption to avoid detection, the classical approaches based on port mapping and payload analysis are ineffective...
A distinguishing feature of wireless mesh network is the use of multiple channels, which breaks through the limitation on data transmission efficiency and network capacity brought by single channel. Common channel framework (CCF), a multichannel mechanism proposed in 802.11s, extends traditional DCF mechanism and is fully compatible with traditional 802.11 WLAN. This paper focuses on the performance...
Conventional research on P2P incentive mechanism is based on cooperative or non-cooperative game theory. This paper assumes the node in the P2P system is limited rationality, using evolutionary game theory to study P2P incentive mechanism, we first investigate individual population P2P incentive model and model the node replicator dynamics. Mathematics analysis and numerical result shows that the...
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