無線物聯(lián)網(wǎng)連接：許多選擇，許多權(quán)衡

　　無線物聯(lián)網(wǎng)連接：許多選擇，許多權(quán)衡

　　物聯(lián)網(wǎng)（物聯(lián)網(wǎng)）得到了很多值得關(guān)注的，因為它提供了許多潛在的好處。雖然安裝在五，十，或更多年的物聯(lián)網(wǎng)連接節(jié)點的數(shù)量是許多投機和市場研究的主題（以及大量的猜測，以及），有一件事是明確的：數(shù)字將是巨大的。物聯(lián)網(wǎng)是密切相關(guān)的工業(yè)兄弟機到機（M2M）的應(yīng)用程序，所以有許多技術(shù)的相似性和實現(xiàn)重疊的兩個類別之間。

　　從高層次的角度來看，安iot consists of三節(jié)點系統(tǒng)功能塊（圖1）：（1）溫度傳感器，或transducer門開/關(guān)閉位置流，as the examples）；2）數(shù)字處理器單元（microcontroller）captures the which does the處理和傳感器數(shù)據(jù)和分析港口；和3）which can be the連通，有線或無線。is an option the前if there is an可用低成本的網(wǎng)絡(luò)或一個“if is installed，安全是關(guān)鍵consideration if the setting，EMI / RFI是嚴格區(qū)分，or if only一些它是連通的。不管一個人多，設(shè)施iot for most is the preferred，無線鏈路選擇裝置和兩個學院的整體靈活性和輕松安置和在初始relocating甚至if needed the iot節(jié)點。

　　Figure 1： The high-level system block diagram of an IoT or M2M node shows the three primary functions： sensor， processor， and connectivity interface.

　　Choosing a standard wireless link does not mean that the design decisions are done and the design process is trivial. Wireless links must adhere to industry and regulatory standards， and regional approval in many cases. There are many wireless IoT options which designers may have to consider. In some installations， the decision is already made due to a mandate or existing network. In others， the designer can evaluate the options and make a choice based on the trade-offs and priorities of performance， network type （mesh， WLAN， point-to-point）， range， power， frequency band（s）， robustness and， of course， cost. There are also major issues of security， authentication， and encryption.