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For high spectrum usage, some independent wireless communication systems should share multi-channel environment. An offloading effect over multi-channel makes system throughput enhanced. A multi-channel access based on channel activities of other systems, which are channel occupancy ratio (COR), is important. The estimation of COR needs a traceability to the transition of COR. In software define radio,...
The cognitive radio (CR) system is powerful technique for significantly improving the frequency spectrum efficiency. This paper clarifies the minimum distance of the two independent wireless LAN (WLAN) systems for suppressing the mutual interference, where the WLAN system is one of CR systems. We use the two real-time spectrum analyzers for the simultaneous detection of the emitted signals from the...
In multi-hop wireless mesh network (WMN), hidden node is one of the major problems when IEEE 802.11 DCF is used as a MAC protocol. It causes data packet collisions between the multi-hop links and significantly affects the network performance. In order to avoid this problem, a novel routing scheme is proposed in this paper. It uses a high sensitive sensing function utilized for cognitive radio. The...
In this paper, we proposed multiband received signal strength fingerprint (MRSS) based location system employing the frequency diversity of received signal strength (RSS). The enhancements of estimated accuracy contribute to the frequency diversity. This paper shows the experimental results under the area of 103 m2, we achieved the accuracy improvement over 40 percent, comparing with the singleband...
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