CDMA can be a digital cellular technology that uses spread spectrum procedures to help multiple buyers to share the identical frequency band, letting more effective use on the obtainable spectrum.
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ISA-ninety five Portion 7 defines technologies independent services and messages for associating and mapping aliases (equivalent identifiers) and associated context which are exchanged concerning production operations domain applications and applications in other domains.
是利用电磁波的反射特性来探测目标。雷达发射机产生特定频率、波形的电磁波，经由天线向空间定向辐射，形成具有一定方向性的波束。当波束遇到目标物体时，电磁波会在目标表面发生反射，其中部分反射波沿着原路返回被雷达天线接收，接收机对微弱的回波信号进行放大、滤波、解调等一系列精细处理，提取出目标的距离、方位、速度等关键信息。这一过程如同向黑暗中投掷石子，通过聆听回声来判断周围物体的位置
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帧同步 ：指将接收的数据序列按照传输时的帧结构正确地划分开来。帧同步一般需要在码片同步的基础上，利用特定的同步序列进行。
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The voice provider could be facilitated with the Voice over IP (VoIP) engineering or simply a cdma2000 1 x fallback. The latter is the more prevalent approach here utilized by CDMA-dependent mobile operators.
Error Correction and Top quality of Company (QoS): EVDO incorporates error correction methods to ensure the integrity of data throughout transmission, even read more in situations with signal interference or noise.
频谱利用率高： 多载波技术可以更有效地使用有限的频谱资源，提高频谱利用率。