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With the increase of network service types and userspsila broadband demand, broadband wireless access (BWA) has become the focus of peoplepsilas attention. The workgroup of IEEE 802 proposes the IEEE 802.16 standard to provide BWA. In IEEE802.16 mesh mode, all nodes are organized in an ad hoc fashion. Nodes use a pseudo-random function to compete for their transmission opportunities based on the scheduling...
This paper firstly introduces the mesh structure of IEEE 802.16, explains the three-way handshaking mechanism under the mesh structure, then questions the conflict problem existing in the previous protocols, and proposes a method to improve the three-way handshaking mechanism. According to simulation results, it performs well, not only shorten end to end delay, but also increase throughput.
After the study of electromagnetic interference (EMI) mechanisms in switching mode power system (SMPS) and the soft switch, this paper proposes a novel hybrid filter (HEF) to suppress commend mode EMI in SMPS. This paper reviews the limits of pure passive and active EMI filter and discusses the advantages of the hybrid EMI filter (HEF). By studying the insertion loss, impedance compatibilities, and...
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