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In this paper, a network routing method based on Quality of Service (QoS) for ZigBee-based mobile ad-hoc networks in a multipath fading environment is studied. The proposed routing method adapts the priority information for QoS to Route Request message in the route discovery process and HELLO message in the route maintenance process. According to the priority information, periods elapsed between transmitting...
In this paper, a route control method for ad-hoc networks in a multipath fading environment is studied which is based on received power of repeater nodes and the history of established links. When repeater nodes received HELLO Message, these nodes obtain the received power information from Physical Layer in order to decide whether a link is stable or not. If the received power is lower than a threshold,...
This paper describes field evaluation results on a mobile WiMAX network and network services in Azumino city. An experimental mobile WiMAX network has been deployed in Azumino city so as to improve the sophistication of public services. Overview of the deployed network and field experimental results on both throughput in UDP (User Datagram Protocol) layer and received power are denoted in this paper...
In this articles, a route discovery method based on the received power of repeater nodes for sensor networks is studied. The received power information in Physical Layer of repeater nodes is added to Route Request Message, and the message is transferred from a source node to a destination node via repeater nodes. In the destination node, the most optimal route is selected from plural candidates according...
This paper describes both link budget analysis and field experimental results on a mobile WiMAX system deployed in Azumino city, the city scale of which is corresponding to suburban. Firstly, in this paper, the link budget analysis is performed in order to evaluate the system performance based on propagation distance, delay spread, average BER (Bit Error Rate) under a multipath fading environment,...
This paper proposes a pole change generator for a windmill. Since micro windmill systems generate power from natural energy, power generation characteristics across a wide band are necessary. However, the conventional generator, in which the open voltage is simply proportional to the rotational velocity, encounters difficulty in generating power across a wide range of rotational velocities from low...
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