系统容量 ：在保证通信质量的前提下，功率控制算法能够支持的用户数量和数据传输速率。
DSSS is Immediate Sequence Spread Spectrum Technique that's a spread spectrum approach wherein the data being transmitted is encoded utilizing spreading code and gained after which decoded using the exact code.
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A frame of bits is passed via a convolutional encoder, introducing forward mistake correction redundancy, making a frame of symbols. These symbols are then spread with the Walsh and PN sequences and transmitted.
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Network Infrastructure: The cellular network infrastructure involves base stations, mobile switching facilities, and data centers that regulate and route EVDO website traffic. Foundation stations converse with mobile devices, whilst mobile switching facilities take care of call routing and control network resources.
Nevertheless, in case you preferred to incorporate a return label with outbound items, you would need to utilize a fork out-on-use company like UPS Floor or FedEx Floor. For the reason more info that USPS fees for labels upon development, any return label you generate expenditures dollars Except you terminate it and request a refund.
Inside the ahead direction, radio alerts are transmitted by base stations (BTS's). Each BTS is synchronized with a GPS receiver so transmissions are tightly managed in time.
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接收端处理： 移动终端接收多个载波上的信号，进行相应的处理以恢复数据。
Voice over EVDO (VoEVDO): Some operators released voice services over EVDO, allowing customers to produce voice calls get more info using the data network. This supplied an alternative choice to standard voice calls and leveraged the existing EVDO infrastructure.
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For voice calls, the targeted traffic channel carries frames of vocoder data. A quantity of different vocoders are described below IS-95, the sooner of which were limited to rate set one, and were answerable for some person complaints of lousy voice high quality.