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A lot of research is done in the field of wireless sensor networks, particularly in the field of ad-hoc networks. Large-scale real-time wireless networks for factory automation are hardly covered by existing research. Such networks usually have thousands of nodes, which makes simulation a necessity for system validation. Discrete Event Simulators (DES) are efficient tools to do so, but their event...
In this paper, we address the problem of decentralized parameter estimation with a Wireless Sensor Network (WSN). The network is hierarchical in that sensors are grouped into clusters, being each cluster under the supervision of a cluster-head (CH). The CH is also in charge of consolidating the sensor observations into a local estimate before its transmission to the Fusion Center (FC). In this context,...
In multihop wireless sensor networks, global clock error will accumulate as the hops grow. Sensors far away from the root are likely to suffer larger synchronization errors, which may deteriorate the accuracy of sensing data or even result in the failure of TDMA MAC protocols. A novel algorithm based on vector Kalman filter using multiple parents (KFMP) is proposed to address this problem. It's pointed...
In this paper, we propose a cross-layer optimization approach that exploits retransmission diversity in wireless CDMA communications. Conventionally, data packets that are not correctly detected are usually dropped. These dropped packets can be used to help data packet detection. By exploiting all the retransmitted packets, data packets can be correctly detected with higher probability. The proposed...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
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