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A body of bits is handed through a convolutional encoder, introducing ahead mistake correction redundancy, making a body of symbols. These symbols are then spread with the Walsh and PN sequences and transmitted.
抗频率选择性衰落： 通过将信号分配到多个载波上，系统可以减少由多径效应引起的频率选择性衰落。
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While discussions did occur in between ETSI as well as ANSI-41 Group with a check out to consolidating collaboration initiatives for all ITU "members of the family," in the long run it absolutely was deemed acceptable more info that a parallel Partnership Project be proven - "3GPP2," which, like its sister challenge 3GPP, embodies the main advantages of a collaborative effort (timely shipping of output, fast Doing work solutions), click here whilst concurrently benefiting from recognition being a technical specs-developing system, delivering a lot easier access from the outputs in to the ITU following transposition of the technical specs inside a Standards Growth Corporation (SDO) into a standard and submittal through the nationwide course of action, as relevant, in to the ITU. Who's Involved?
The mobile acquiring a variable-rate targeted traffic frame won't know the rate at which the frame was transmitted. Typically, the body is decoded at Every single feasible rate, and working with the quality metrics with the Viterbi decoder, the correct result is chosen.
Overall, 3GPP2 has performed a critical part in the development and evolution of CDMA-centered wireless communication networks.
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切换完成： 一旦移动终端确定已经稳定接收到来自新基站的信号，将减少与原基站的连接，直至完成切换。
These protocols make sure that data packets are despatched and been given efficiently, without collisions or interference. They assist handle t
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Originating inside the late 1990s and early 2000s, EVDO enhanced the abilities of the present CDMA2000 know-how, a blend of 2G and 3G standards, focusing specifically on optimizing data throughput.