By Samuel C. Yang
CDMA2000 is of serious curiosity to instant communications pros simply because this 3G (third iteration) commonplace offers for swifter info charges, always-on facts provider, and more suitable voice community means. Breaking down complicated expertise into easy-to-understand strategies, this hands-on, system-level source bargains RF (radio frequency) and instant procedure engineers professional tips in designing, optimizing, and working a CDMA2000 instant community.
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Extra resources for 3G CDMA2000 : wireless system engineering
If there is one, then the transmit diversity pilot channel is transmitted continuously at a power level that is the same as or lower than that of the forward pilot channel. 3 Auxiliary Pilot Channel (F-APICH) The F-APICH is a new signaling channel in IS-2000. This channel can be identified by a Walsh code or by a quasi-orthogonal function . It carries no baseband information in that the baseband sequence is a stream of 1s that are spread by its assigned Walsh code or quasi-orthogonal function. The auxiliary pilot channel supports the use of spot beam on the forward link.
As a result, symbols are transmitted using two different paths: I and Q. As we will see later, this quadrature arrangement is one of the reasons why IS-2000 has a capacity higher than that of IS-95. 14 show those functions that are unique to IS-2000, and only those channels of Spreading Rate 1 are shown. Note that a forward supplemental channel cannot have power control bits punctured into it. 6 Modulation After demultiplexing, the I and the Q symbols are channelized and spread by a Walsh code (or quasi-orthogonal function) assigned to that physical channel.
CDMA RF System Engineering, Norwood, MA: Artech, 1998. Selected Bibliography TIA-97, Recommended Minimum Performance Standards for cdma2000 Spread Spectrum Base Stations, Telecommunications Industry Association, February 2003. TIA-98, Recommended Minimum Performance Standards for cdma2000 Spread Spectrum Mobile Station, Telecommunications Industry Association, February 2003. Garg, V. , IS-95 CDMA and cdma2000: Cellular/PCS Systems Implementation, Upper Saddle River, NJ: Prentice Hall PTR, 2001.
3G CDMA2000 : wireless system engineering by Samuel C. Yang