Performance evaluation on dual-mode transceivers in wireless body area networks
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Wireless body area network (BANs) have attracted a lot of attention as a future technology of wireless networks. Wireless BANs are generally divided into two kinds of groups, i.e., on-body BANs and in-body BANs. However, the performance requirements and channel propagation characteristics of the two BANs are quite different from each other, that is, wireless signals are approximately transmitted along the human body as a surface wave in on-body BANs, on the other hand, the signals are transmitted through the human tissue in in-body BANs. As a solution for this problem, this paper develops a structure of dual-mode transceivers, which is composed of transmitters for in-body and on-body communications and a receiver for the both communications. Then, we evaluate the communication performance of the dual-mode transceivers via a computer simulation with realistic channel models, which can well represent the propagation characteristics of on-body and in-body communications. Our computer simulation results demonstrate the feasibility of the dual-mode transceiver structure in wireless BANs.Keywords:
Transceiver
Body area network
Dual mode
2相密閉サーモサイフォンは構造は簡単であるが, 下部加熱の時にのみ作動するため応用範囲が制限されている.このため (1) バブルポンプをサーモサイフォン中に組み込む方式, (2) 浸透膜を組み込み, ループ式のサーモサイフォンとする方式, あるいは (3) 内部に電極を取り付け, これと容器壁間に高電圧を付加するEHD (Electro hydro dynamics) 方式などが提案されている.しかしいずれも付帯装置が必要であったり安定な動作が得にくいなどの欠点があり, いまだ実用化には至っていないのが現状である.そこで本報ではサーモサイフォン内部に電磁ポンプを組み込み上部加熱でも作動し得る双方向型サーモサイフォンを開発した.さらにその双方向型サーモサイフォンを2本組み合わせ双方向型カスケード式サーモサイフォン (Dual mode Cascaded Thermosyphon, 以下ではDCTと略する) を開発し, その基本的な作動特性について検討した.
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