Li Bin Jiang

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The paper considers scenarios in which fairness and efficiency are two conflicting objectives in wireless networks, and investigates the use of a proportional fairness objective to strike a balance between the two objectives. We explain the physical meaning of proportional fairness in a wireless network and give an analysis showing that proportional(More)
Two well-known problems that can cause performance degradations in IEEE 802.11 wireless networks are the exposed-node (EN) and hidden-node (HN) problems. Although there have been isolated and incidental studies of EN and HN, a comprehensive treatment has not been attempted. The contributions of this paper are threefold: First, we provide rigorous(More)
In large-scale wireless networks, interference among nodes limits channel spatial re-use and is a main hurdle for scalable performance. There are two types of interference: (1) physical interference due to the receiver's inability to decode a signal when the power received from other signals is large; (2) protocol interference imposed by the specific(More)
One of the most challenging tasks in requirements engineering is the establishment of guidelines of when and how to use certain requirements engineering processes within the project context. Requirements interaction detection, as a requirements engineering activity, still lacks the definition of precise guidelines for when and how to apply the different(More)
This paper investigates the hidden-node phenomenon (HN) in IEEE 802.11 wireless networks. HN occurs when nodes outside the carrier-sensing range of each other are nevertheless close enough to interfere with each other. As a result, the carriersensing mechanism may fail to prevent packet collisions. HN can cause many performance problems, including(More)
<i>Interferences</i> in an ad-hoc network can be defined as a set of constraints that specify which groups of nodes cannot transmit simultaneously, and they have significant implications for the network capacity and other performance measures. This paper expounds the difference between two types of interferences: 1) physical interferences due to the(More)
In this paper, we present a novel architecture named as Window-MSPA architecture which targets to window operations in image processing. We have previously developed a Memory Sharing Processor Array (MSPA) for fast array processing with regular iterative algorithms. Window-MSPA tries to optimize the data I/O ports and the number of processing elements so as(More)
Unlike wired networks, wireless networks are characterized by channel errors. In wireless LANs (WLANs), link-layer ARQ can be used for error recovery. However, this technique assumes packet losses are due to packet collisions. With FIFO queuing at the access point (AP), ARQ may give rise to a "head-of-line (HOL) blocking" phenomenon that severely degrades(More)
Existing requirements engineering (RE) process assessment models lack the components necessary to provide enough information about the quality of an RE process. The concept of "concern of requirement engineering" (CORE) and the assessment models proposed in our previous research provide a method and new perspectives to assess the quality of an RE process.(More)
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