M2M系统用蜂窝调制解调器

未知 2017-06-01 11:04:07 0评

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  M2M系统用蜂窝调制解调器

  通过利用运营商已经安装的蜂窝基础设施,设计人员可以使用这个网络,而不是Wi-Fi或替代网络接口,用于收集数据或提供远程管理。对于小到中等规模的数据包来说,蜂窝网络可以减少大型分布式系统的硬件预算,因为没有本地Wi-Fi热点或中继器需要连接到蜂窝网络的每个设备。此外,蜂窝调制解调器具有更长的距离(信号可以进一步)比Wi-Fi或其他无线网络接口。

  有多个蜂窝选项取决于您需要的数据传输速率和运营商在该地区需要连接。现在使用的各种标准,包括GSM、GPRS、CDMA、HSPA、EVDO、CDMA,边缘,和LTE。在一些地区,2G蜂窝服务可以提供低数据速率连接到约40千位/秒,更快的连接,3G服务,如边缘和CDMA2000和HSPA+可以提供数据速率高达3.1兆位/秒和21兆位/秒,分别,而数据传输率最高,4g(LTE)服务,EVDO / CDMA和HSPA +可以提供高达100兆位/秒的数据传输速率,取决于载波。此外,公司现在正在致力于什么是所谓的5G网络,这将提供另一个数据传输速度增加了十倍,当它成为现实,可能在2016 / 2017帧时间或以后。

  M2M系统用蜂窝调制解调器

  Luckily, for machine-to-machine (M2M) communications most data transfers do not involve large quantities of data, but, instead use short bursts of a few hundred to a few thousand bytes. However, transmission speed is still important — short, high-speed bursts of data will often consume less power than a slower, continuous stream of data. The short bursts allow the baseband processors to spend more time in their power-down modes, thus greatly reducing power consumption.

  At the heart of any cellular modem is the baseband processor, which, thanks to the high volume of cell phones produced over the last few years, has been integrated down to a single chip, thus simplifying the design of the modem. A typical modem module in the Skywire family from NimbeLink (Figure 1) is squeezed into an XBEE module format (29 x 33 x 6.5 mm) that was created by Digi International. Such modules are also in widespread use on development boards, such as the various ARM-based Arduino processor boards.

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