By Samuel C. Yang
CDMA2000 is of severe curiosity to instant communications execs simply because this 3G (third new release) average presents for quicker information charges, always-on facts provider, and superior voice community potential. Breaking down advanced expertise into easy-to-understand suggestions, this hands-on, system-level source bargains RF (radio frequency) and instant approach engineers professional advice in designing, optimizing, and working a CDMA2000 instant community.
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Extra info for 3G CDMA2000 : wireless system engineering
In addition, because the R-EACH is coherently modulated, a reverse pilot is transmitted at the same time to aid in its coherent demodulation at the base station. 8 show the different types of R-EACH transmissions. Similar to the R-CCCH transmission, the R-EACH preamble consists of a series of gated reverse pilot channel transmissions. The mobile transmits the reverse pilot during preamble at a higher power to facilitate acquisition of the R-EACH. For the preamble, the duration of the gated transmissions t1, the duration of the off time t3, the duration of the last gated transmission t2, the total number of gated transmissions (N + 1), and the total duration of the preamble Tpreamble are completely specified by the appropriate R-EACH parameters.
42 Physical Layer: Reverse Link and the R-EACH. The R-EACH is described in the next section. The R-CCCH is “common” in that it is shared among many mobiles, but the key difference here is that the use of this channel is scheduled among the different mobiles2. Note that the R-CCCH is only used when there is no R-DCCH or no R-FCH active on the reverse link. As soon as a reverse dedicated control channel and/or reverse fundamental channel become active, signaling messages are then sent on either one or both of these channels.
The frame structures are identical if we map forward link Radio Configurations 3, 4, 6, and 7 to reverse link Radio Configurations 3 and 5, and forward link Radio Configurations 5, 8, and 9 to reverse link Radio Configurations 4 and 6. 42 Physical Layer: Reverse Link and the R-EACH. The R-EACH is described in the next section. The R-CCCH is “common” in that it is shared among many mobiles, but the key difference here is that the use of this channel is scheduled among the different mobiles2. Note that the R-CCCH is only used when there is no R-DCCH or no R-FCH active on the reverse link.