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  • 4G & Beyond Convergence of Networks

    From the transition of analog to digital communication along with seamless mobility and high computing power of small handheld devices, the wireless communications industry has seen tremendous changes leading to the integration of several telecommunication networks, devices and services over last 30 years. The rate of this progress and growth has increased particularly in the past decade because people no longer use their devices and networks for voice only, but demand bundle contents such as data download/streaming, HDTV, HD video , 3D video conferencing with higher efficiency, seamless connectivity, intelligence, reliability and better user experience. Although the challenges facing service providers and telecommunication companies differ by product, region, market size, and their areas of concentration but time to market, efficient utilization of their assets and revenue expansion, have impacted significantly how to manage and conduct their business while maintaining sufficient margin. 

    標簽: Convergence Networks Beyond 4G of

    上傳時間: 2020-05-26

    上傳用戶:shancjb

  • Next-Generation+Wireless+Technologies

    In the past few decades, a technological revolution has occurred that has changed the way we live in dramatic ways. This technological revolution is the result of the emergence and evolution of a wide variety of new wireless networking tech- nologies. Now people using these technologies are able to access the network and control many applications at will with their handheld devices anywhere, anytime. Although these technologies have made a long lasting impact in the revolution, it has also opened up various challenging issues which are yet to be resolved to make them more efficient and cost-effective. 

    標簽: Next-Generation Technologies Wireless

    上傳時間: 2020-05-31

    上傳用戶:shancjb

  • 基于CCD和USB的測溫攝像機研究與設計

    本文首先對黑體輻射理論和雙波段比值測溫理論進行研究,探討在近紅外區域對高溫爐窯進行比值測溫的可行性;針對工業高溫爐窯輻射的峰值位置在中紅外區域,近紅外區域的輻射仍然比較低,且普通CCD在近紅外區域響應很低的狀況,綜合考慮后選擇近紅外增強型CCD作為探測器;根據所選CCD本文設計了一套完整的雙波段測溫系統的硬件框架,由Sony公司的近紅外增強型黑白CCDICX255AL,10位輸出模數轉換器AD9991、帶有USB接口的可編程增強型8051處理器芯片Cy7c68013和EEPROM存儲器等完成功能,并提出雙波段測溫攝像機的分束和濾光系統的設計方案;由于光學分束鏡和濾光片都需要定制鍍膜,本文首先設計的硬件系統是單波段系統,本系統的硬件電路有兩塊線路板:以ICX255ALCCD和AD9991為核心的圖像采集板和帶USB接口的8051處理器芯片Cy7c68013為核心的控制板,這兩塊PCB均為2層電路板;還開發了相應的固件程序、設備驅動程序和應用程序,對所設計的各個功能模塊分別進行了測試和調試,計算機能通過USB口讀取圖像并在屏幕上顯示,獲得了良好的效果;由于本文設計的硬件系統實際上是單波段的,為了驗證雙波段測溫的效果,本文采用ASD FieldSpec handheld型光譜儀測量模擬黑體輻射源(工業爐密的爐膛也是個近似黑體輻射源)的輻射,用測得的光譜數據模擬計算,獲得了良好的測溫效果。

    標簽: ccd usb 測溫攝像機

    上傳時間: 2022-06-22

    上傳用戶:

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