A Review Of High-Speed Packet Data
A Review Of High-Speed Packet Data
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开环功率控制 ： 开环功率控制是基于接收信号强度的预测进行的，它不需要反馈信息。在移动终端接入网络时，会根据信号的衰落特性预先设定发射功率。开环控制主要用于解决信号在传播过程中遇到的路径损耗问题。
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A body of bits is handed by way of 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.
The network will Manage the transmitted electric power of the visitors channel to help keep the signal good quality just ok, therefore trying to keep the sounds stage witnessed by all other buyers to the least.
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Energetic (gradual) electricity Handle is also utilised around the forward visitors channels, wherever throughout a call, the mobile sends signaling messages into the network indicating the caliber of the sign.
Appropriately, capacity improves with SNR and bandwidth. IS-95 has a set bandwidth, but fares perfectly within the digital entire world mainly because it usually takes active methods to improve SNR.
Foundation station sends the acquired sign energy info to the transmitter and tells to increment or decrement the transmission electrical power appropriately in subsequent transmissions.
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This paper addresses the newest strategies for enhancing the data rates and spectral efficiency on the significant velocity packet access (HSPA) mode of wideband CDMA (WCDMA). The improvements are on account of…
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IS-95 and its utilization of CDMA strategies, like another communications program, have their throughput minimal Based on Shannon's theorem.