By Samuel C. Yang
CDMA2000 is of severe curiosity to instant communications pros simply because this 3G (third iteration) typical presents for speedier facts premiums, always-on info provider, and stronger voice community skill. Breaking down complicated know-how into easy-to-understand suggestions, this hands-on, system-level source deals RF (radio frequency) and instant approach engineers specialist assistance in designing, optimizing, and working a CDMA2000 instant community.
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Extra resources for 3G CDMA2000 : wireless system engineering
In a given CDMA carrier, there is a one-to-one correspondence between an F-CCCH and an R-CCCH. Therefore, it is not surprising that the frame formats supported by the R-CCCH are exactly the same as its forward link counterpart. 4 Kbps). 3. Despite the identical frame formats used by both the F-CCCH and the R-CCCH, the transmission of the R-CCCH does differ from its forward link counterpart. First, before transmitting the actual R-CCCH frame(s) the mobile transmits a preamble. This is done to help the base station in acquiring the R-CCCH.
In addition, if there are more than one spot beams then each spot beam is assigned a different auxiliary pilot channel (which is in turn spread by a different Walsh code or quasiorthogonal function). From the mobile’s perspective, the mobile reports the number of auxiliary pilots that it sees using the NUM_AUX_PILOTS field in the origination message and page response message. For each reported auxiliary pilot, the mobile also reports parameters such as the phase (PILOT_PN_PHASE), strength (PILOT_STRENGTH), and Walsh code (PILOT_WALSH) if a Walsh code is used to spread the auxiliary pilot.
Note that Radio Configuration 1 and Radio Configuration 2 are backward compatible with IS-95 in that they are equivalent to Rate Set 1 and Rate Set 2 of IS-95. For each radio configuration, the table shows the maximum achievable data rate (instead of all possible data rates). 6 Kbps is shown. 3 Signaling Channels 15 configuration the coding rate R is normally the same regardless of the size of the frame (20 ms or 5 ms). , Spreading Rate 3), the coding rate is dependent on the size of the frame transmitted.
3G CDMA2000 : wireless system engineering by Samuel C. Yang