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In this paper, we propose Opportunistic Carrier Prediction (OCP) that jointly addresses exposed terminal and hidden terminal problems in wireless networks. OCP is based on the rationale that past interference information can be a good indicator for the outcome of future packet delivery. Each OCP sender maintains a summary of past interference information and opportunistically accesses the channel...
Recent experimental results have shown that the minimum signal-to-interference ratio required at a receiver (CPth) depends on the order of arrival of the overlapping frames. For a given sender-receiver distance, this differential capture capability of a receiver leads to two distinct interference ranges (ri) around the receiver, and its value is much smaller when the sender's frame arrives earlier...
Understanding the capacity of end-to-end throughput limits with any given wireless ad hoc network is critical to its deployment but very challenging task. This paper aims at conducting a quantitative analysis to get an expression for the upper bound for the throughput limits for regular network topologies like chain and grid networks. Factors such as carrier sense threshold that optimizes the throughput...
Recent experimental studies on physical layer capture in 802.11 based networks have demonstrated that the minimum signal-to-interference ratio required for successful reception of a frame depends upon the order of arrivals of the sender's frame and the interference, and it is much less when the sender's frame arrives earlier. This differential capture capability (DCC) leads to a very small interference...
In this paper we consider a network of distributed sensors that are trying to measure a parameter of interest cooperatively, by exchanging their acquired information repeatedly over fading channels. We consider different ways of using the available bandwidth, in terms of what each node can send to its neighbors. More specifically, we characterize the impact of local fusion and show how it is a suitable...
In this paper, we introduce a new denial-of-service attack on wireless networks: low-power, distributed jamming network (DJN). DJN is composed of large number of low-power jamming devices, which are deployed in proximity to the target devices. DJN can cause significant damage to target network performance with high energy efficiency. In the paper, we provide a characterization of DJN, demonstrate...
In multihop wireless ad-hoc networks, the medium access control (MAC) protocol plays a key role in coordinating the access to the shared medium among wireless nodes. Currently, the distributed coordination function (DCF) of the IEEE 802.11 is the dominant MAC protocol for both wireless LANs and wireless multihop ad hoc environment due to its simple implementation and distributed nature. The current...
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