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This paper presents a sub-channel allocation algorithm for OFDMA-based multi-cell networks where co-channel interference from nearby cells is serious in the downlink transmission. The algorithm is semi-distributed in the sense that the sub-channel allocation can be split between radio network controller (RNC) and base stations (BSs). RNC will decide the sub-channels used by each BS at the super-frame...
This paper dealt with localization of a mobile robot using received signal strength (RSS) and detailed a practical evaluation about the suitability of the RSS based localization. RSS technique is especially appealing for localization in WSN due to its simplicity such as low cost, size and power constraints, despite of the fact that RSS may bring in very noisy range estimates. We conducted numerous...
In order to fully consider the topology relationship among the anchor nodes and the topology relationship between the anchor nodes and unknown nodes, an Improvement of DV-Hop Algorithm Based on Collinearity is proposed. The main principle of the proposed scheme is to introduce the concept of normalized colinearity (NC) into the selection phase of beacon nodes. Based on DV-Hop, best available anchor...
ZigBee is an emerging standard for the low cost, low power and low rate wireless networks. ZigBee standard specifies two routing protocols: a tree routing protocol and a route discovery protocol similar to AODV. The second one discovers the optimal path by flooding route quest command frame, which wastes significant amount of bandwidth and energy. This paper proposes a novel route discovery method...
Teleoperation system plays an important role in executing tasks under hazardous environments. Unfortunately, most of the traditional teleoperation systems are expensive and bulky thus not suitable to provide real-world services. This paper introduces a novel architecture for the teleoperation of mobile robot based on Personal Digital Assistant(PDA) with mobility, facility and low cost. The architecture...
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