By Samuel C. Yang
CDMA2000 is of serious curiosity to instant communications pros simply because this 3G (third iteration) ordinary presents for swifter info premiums, always-on facts provider, and more advantageous voice community potential. Breaking down advanced expertise into easy-to-understand ideas, this hands-on, system-level source deals RF (radio frequency) and instant procedure engineers specialist suggestions in designing, optimizing, and working a CDMA2000 instant community.
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CDMA2000 is of severe curiosity to instant communications execs simply because this 3G (third iteration) regular presents for quicker facts premiums, always-on info carrier, and more advantageous voice community means. Breaking down complicated know-how into easy-to-understand options, this hands-on, system-level source bargains RF (radio frequency) and instant procedure engineers professional suggestions in designing, optimizing, and working a CDMA2000 instant community.
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Additional info for 3G CDMA2000 Wireless System Engineering
This issue is important because the mobile does not (yet) have any assigned channels or resources when it first transmits its access request. To transmit its access request, the mobile uses the R-EACH. The R-EACH is similar to the IS-95 access channel (R-ACH) in that the mobiles’ R-EACH transmissions are randomized. Although collisions are still possible, a mobile’s R-EACH transmission is typically shorter in duration than a mobile’s R-ACH transmission3. Hence the probability of collisions is smaller on the R-EACH.
The F-CPCCH consists of a stream of (power control) bits that is not errorprotected. This is because power control bits need to be demodulated rapidly so that power control decisions can be made quickly to adapt to changing channel conditions. Not needing to check the CRC bits, convolutionally decode all the bits, and de-interleave save a lot of processing time. Note that this is the same reason for not error-protecting the power control bits in IS-95 (and in IS-2000). 8 shows an example format of the F-CPCCH.
1 and is reproduced here for completeness. Note that asterisked channel designations show those channels that also exist in IS-95. Also, boldfaced channel names show those channels that are collectively known as the IS-2000 traffic channels since these channels can all carry user traffic data in IS-2000 systems. , reverse fundamental channel, reverse supplemental code channel, reverse supplemental channel, and reverse dedicated control channel) can also assume different configurations to implement different data rates.