By Samuel C. Yang
CDMA2000 is of serious curiosity to instant communications execs simply because this 3G (third new release) regular presents for swifter facts charges, always-on information provider, and greater voice community potential. Breaking down advanced know-how into easy-to-understand suggestions, this hands-on, system-level source bargains RF (radio frequency) and instant procedure engineers specialist suggestions in designing, optimizing, and working a CDMA2000 instant community.
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Additional resources 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.
PI and pQ are different short PN codes in that they are produced by two different generator polynomials. However, both codes start at the same time and are offset by the same amount of chips. This is important because each base station sector is uniquely identified by its short PN code offset. 15 shows how the I and the Q symbols are channelized and spread in a complex manner. 15 may look complex at first, it is really just a way to diagrammatically implement the multiplication of two complex numbers.
Transmit power control subchannel 1, and so on. In the Q path the first bit position of each power control group is used to transmit power control subchannel 12, and the last bit position in the same power control group is used to transmit power control subchannel 23. Therefore, in this example each power control group is capable of carrying 24 power control subchannels (0–23). Since the same 24 power control subchannels are replicated in subsequent common power control groups1, the transmission rate of the power control bits for each subchannel is 800-times-per-second.
3G CDMA2000 : wireless system engineering by Samuel C. Yang