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HOPPING

Multi-hop+Mesh+Networks

Notwithstanding its infancy, wireless mesh networking (WMN) is a hot and growing field. Wireless mesh networks began in the military, but have since become of great interest for commercial use in the last decade, both in local area networks and metropolitan area networks. The attractiveness of mesh networks comes from their ability to interconnect either mobile or fixed devices with radio interfaces, to share information dynamically, or simply to extend range through multi-HOPPING.

標簽： Multi-hop Networks Mesh

上傳時間： 2020-05-31

上傳用戶：shancjb
WiFi,+WiMAX+and+LTE+Multi-hop+Mesh+Networks

Notwithstanding its infancy, wireless mesh networking (WMN) is a hot and growing field. Wireless mesh networks began in the military, but have since become of great interest for commercial use in the last decade, both in local area networks and metropolitan area networks. The attractiveness of mesh networks comes from their ability to interconnect either mobile or fixed devices with radio interfaces, to share information dynamically, or simply to extend range through multi-HOPPING.

標簽： Multi-hop Networks WiMAX WiFi Mesh LTE and

上傳時間： 2020-06-01

上傳用戶：shancjb
基于有藍牙共存情況下的WiFi射頻模塊設計

移動通信網絡由于帶寬和技術的限制，遠遠不能滿足人們不斷高漲的無線上網需求。Wi-Fi作為無線接入技術MLAN的主流標準口益成熟，它能夠隨時隨地高速連接到Internet，極大地滿足了用戶對無線上網需求，受到消費者的青睞。因而越來越多的移動終端都集成了Wi-Fi功能，Wi-Fi和藍牙樣成為移動終端的標配。隨之而來的是wi-Fi和藍牙都工作在2.4CHZz ISM頻段而引發的互相擾問題，導致數據吞吐量下降，語音質量惡化失真，極端狀況下甚至導致鏈路斷開而不能正常工作。因此，必須尋求有效的措施和方法，實現兩種技術在近距離的和諧共存，這已成為非常迫切的技術需要，也成為人們研究的一個熱點和難點。近距離WiFi和藍牙互相1擾的問題，目前已經形成了非常多的有效解決機制，包括基于Wi-Fi的PTA（Packet Traffic Arbitration）、AWMA（Alternating Wireless Medium Access）和DSE（Deterministic Spectral Excision），其中PTA和AWMA機制在Wi-Fi側MAC層實現，通過協調Wi-Fi和藍牙的幀發射時間來避免相互干擾：而DSE是在Wi-Fi側物理層PHY實現，通過一個可編程帶阻濾波器（Notch Filter）來阻止來白藍牙的窄帶干擾。還有基于藍牙側的AFH（Adaptive Frequency HOPPING），它通過跳頻，自動避開被干擾的頻點，從而大大提高了藍牙傳輸性能。

標簽： 藍牙共存 wifi 射頻模塊

上傳時間： 2022-06-20

上傳用戶：zhanglei193