低功耗無線技術比較

　　這篇文章比較了藍牙低能量，螞蟻，螞蟻+，ZigBee，ZigBee RF4CE，Wi-Fi，耐克+，IrDA，和近場通信（NFC）標準，細化的特點，利益，和在各種應用中，每個協議的不足之處。

　　隨著超低功耗無線芯片組的引入，許多創新性的新應用正在成為可能。直到最近，在傳感器和客戶端之間實現數據傳輸的唯一方法是使用電線，或者手動從日志設備收集數據。無線技術已經幾十年了。然而，他們傾向于使用大量的電力，需要專門的設備來建立通信。

　　大多數目標市場的特點是在傳感器節點和中心設備之間周期性地傳遞少量傳感器信息。一些確定的最終產品，可能實現低功耗無線電系統包括手機，健康和健身設備，家庭自動化，供暖，通風，空調（HVAC），遙控器，游戲，人機接口設備（HID），智能儀表，付款，和許多其他。

　　These applications are all constrained by the following critical key requirements： ultra-low-power， low cost， and physical size.

　　The ultra-low-power requirement is mainly due to the need of targeted devices to operate for extended periods of time from coin cells or energy scavenger technology. Apart from the obvious advantages of a low chipset cost， overall product expense is largely affected by the power source. For example， if a shopping mall has a wireless beacon in every shop and batteries need replacing regularly， the maintenance cost will soon outweigh the advantages of such a technology being deployed.

　　This article analyzes the pros and cons of various low-power wireless technologies and leaves it up to the reader to decide which technology is most suitable for their intended product.