Advances in communication and networking technologies are rapidly making ubiq- uitous network connectivity a reality. Wireless networks are indispensable for supporting such access anywhere and at any time. Among various types of wire- less networks, multihop wireless networks (MWNs) have been attracting increasing attention for decades due to its broad civilian and military applications. Basically, a MWN is a network of nodes connected by wireless communication links. Due to the limited transmission range of the radio, many pairs of nodes in MWNs may not be able to communicate Directly, hence they need other intermediate nodes to forward packets for them. Routing in such networks is an important issue and it poses great challenges.
標簽： Multihop Wireless Networks
上傳時間： 2020-05-31
上傳用戶：shancjb
Recent advances in wireless communication technologies have had a transforma- tive impact on society and have Directly contributed to several economic and social aspects of daily life. Increasingly, the untethered exchange of information between devices is becoming a prime requirement for further progress, which is placing an ever greater demand on wireless bandwidth. The ultra wideband (UWB) system marks a major milestone in this progress. Since 2002, when the FCC allowed the unlicensed use of low-power, UWB radio signals in the 3.1–10.6GHz frequency band, there has been significant synergistic advance in this technology at the cir- cuits, architectural and communication systems levels. This technology allows for devices to communicate wirelessly, while coexisting with other users by ensuring that its power density is sufficiently low so that it is perceived as noise to other users.
上傳時間： 2020-06-01
上傳用戶：shancjb
A wireless ad-hoc network is a wireless network deployed without any infrastructure. In such a network, there is no access point or wireless router to forward messages among the computing devices. Instead, these devices depend on the ad-hoc mode of their wireless net‐ work interface cards to communicate with each other. If the nodes are within the transmis‐ sion range of the wireless signal, they can send messages to each other Directly. Otherwise, the nodes in between will forward the messages for them. Thus, each node is both an end system and a router simultaneously.
上傳時間： 2020-06-01
上傳用戶：shancjb
Wide 2.2V to 6V Input Voltage Range ? 0.20V FB adjustable LED drive current ? Directly drive 9 Series 1W LED at VIN>=6V ? Fixed 800KHz Switching Frequency ? Max. 3A Switching Current Capability ? Up to 92% efficiency ? Excellent line and load regulation ? EN PIN TTL shutdown capability ? Internal Optimize Power MOSFET
標簽： sc3633
上傳時間： 2021-11-05
上傳用戶：d1997wayne
以STM32F103單片機與STM32F103單片機之間進行SPI雙機通信為例,直接使用DMA傳輸進行數據的發送與接收,最后通過實驗證明了DMA傳輸的高效和準確性。with the SPI dual-MIC communication between STM32F103 MCU and STM32F103 MCU taken as an example,data transmission and reception are carried out Directly by using DMA transmission to prove the efficiency and accuracy of DMA transmission by experiments.
上傳時間： 2022-03-27
上傳用戶：aben
因此，您想編寫一個內核模塊。您知道C，您已經編寫了一些可以作為進程運行的常規程序，現在您想知道真正的動作在哪里，一個通配指針可以擦掉文件系統，核心轉儲意味著重新啟動。內核模塊到底是什么？模塊是可以根據需要加載和卸載的代碼段。它們擴展了內核的功能，而無需重新引導系統。例如。模塊驅動程序的一種類型是設備驅動程序，它允許內核訪問沒有模塊的系統硬件，我們將不得不構建單片內核并將新功能直接添加到內核映像中，除了具有更大的內核之外，這還具有缺點每次我們想要新功能時都要求我們重建并重新啟動內核的過程So, you want to write a kernel module. You know C, you, ve written a few normal programs to run as processes, and now you want to get to where the real action is, to where a single wild pointer can wipe out your file system and a core dump means a reboot.What exactly is a kernel module? Modules are pieces of code that can be loaded and unloaded into th upon demand. They extend the functionality of the kernel without the need to reboot the system. For example.one type of module is the device driver, which allows the kernel to access hardware connected to the syste without modules, we would have to build monolithic kernels and add new functionality Directly into the em ernel image, Besides having larger kernels
標簽： linux
上傳時間： 2022-03-30
上傳用戶：
針對交流電路過零檢測電路存在結構復雜、過零點檢測不準確、編程繁瑣等問題，設計了一種基于LM339的硬件結構簡單的過零檢測電路。通過仿真軟件Mulisim對該設計電路進行了仿真，實驗證明了該方案過零檢測的可行性、穩定性和可靠性，可直接作為交流電路中CPU的過零信號。Aiming at the problems of AC cilsuit zero crossing detection circuit such as complex structure, zero crossing detection and cumbersome programming, a zero crossing detection circuit with simple hardware structure based on LM339 was designed. The design circuit was simulated by simulation software Mulisim, and the feasibility, stability and reliability of zero crossing detection were proved by experiments, which can be used as zero crossing signal of CPU in AC circuit Directly.
上傳時間： 2022-05-03
上傳用戶：
