在20世纪50年代的美国，大多数家庭只有一部手机，而无线电话当时还没有发明出来。
In the 1950s in the USA, most families had just one phone at home, and wireless phones hadn't been invented yet.
而无线传感器正呈指数级增长。
而无线网络的带宽却是有限的。
而无线设备面临很多不同的因素可以使得信号的传输更加困难。
Wireless devices, however, introduce a number of different factors that make the transmission of this signal a lot more difficult.
而无线传感器网络是信息物理系统重要的组成部分。
Wireless sensor network is an important part of Cyber-physical systems.
而无线数字式音频传播与解码，是新一代的无线数字P CM音频传播系统。
And wireless communication and digital audio decoding, is the next generation of wireless digital communication systems PCM audio.
模拟摄像头是其中的重要部分，而无线摄像头是在需远程控制时的一个备用选择。
Analog cameras are usually bundled into the system although IP camera are an option if remote monitoring is needed.
而无线传感网络操作系统必须能够满足无线传感网络的特殊性所带来的技术要求。
However, wireless sensor network operating system must be able to meet technical requirements brought about by specificities of the wireless sensor network.
最基本的不同的是，有线网络沟通，通过数据电缆，而无线网络的沟通，通过无线电信号。
The most basic difference is that wired networks communicate through data cables, while wireless networks communicate through radio signals.
视频监控系统是视频压缩和传输技术的一个重要应用领域，而无线网络为监控系统提供了更加广阔的平台。
Video surveillance system is a significant application in the field of video compression and transmission, and wireless network serves a broad platform for it.
无线通信是无线电波拦截容易获取的目标，而无线设备几乎没有任何计算能力来支持所有通信数据的强加密。
Wireless communications are easy targets for air wave interception, and wireless devices rarely have the computing power to support strong encryption of all communication data.
而无线网络本身带宽多变、终端异构、丢包率高等与生俱来的特点对网络结构和协议的设计提出了新的要求。
Because of the changing bandwidth, heterogeneous terminals and high packet loss rate, the wireless networks put forward new requirement for the design of network architectures and protocols.
而无线电监测是无线电管理的重要任务，一个高速度的、宽带的、自动化的无线电监测系统是开展无线电监测工作的重要武器。
Radio monitoring is one of the main tasks of the radio management, a high-speed, wide-band and automatic monitoring system is the most important tool to the radio monitoring work.
归因于其依赖过时的无线电设备，还有互联网和移动电话——而这两方面都因断电而无法运作。
Its reliance not on old-fashioned radios, but on the Internet and mobile telephones-both of which were knocked out by a power failure.
即使在恶劣的无线移动信道下，该跟踪方法仍然能够跟踪相当长信息符号块而无需重新捕获。
Even in the badly wireless channel environment the proposed tracking method can track considerable blocks of symbol and there is no need for channel acquisition again.
即使在恶劣的无线移动信道下，该跟踪方法仍然能够跟踪相当长信息符号块而无需重新捕获。
Even in the badly wireless channel environment the proposed tracking method can track considerable blocks of symbol and there is no need for channel acquisition again.
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