By Samuel C. Yang
CDMA2000 is of serious curiosity to instant communications pros simply because this 3G (third new release) common presents for swifter information charges, always-on info provider, and enhanced voice community means. Breaking down advanced know-how into easy-to-understand innovations, this hands-on, system-level source deals RF (radio frequency) and instant method engineers specialist assistance in designing, optimizing, and working a CDMA2000 instant community.
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6. Although IS-95 also has a QPSK modulator, its in-phase and quadrature branches carry identical symbols. Thus strictly speaking, IS-95 uses two identical BPSK modulators. 7 Capacity Gain: Forward Link 35 References    TIA/EIA-95-B, Mobile Station-Base Station Compatibility Standard for Wideband Spread Spectrum Cellular Systems, Telecommunications Industry Association, March 1999. 2-A, Physical Layer Standard for cdma2000 Spread Spectrum Systems, Telecommunications Industry Association, March 2000.
Since the mobile also possesses the same long code mask and the same long code generator, the exact position of a given power control subchannel is known perfectly to the mobile. In addition to supporting 16 power control groups per 20-ms frame, IS-2000 can also support 8 power control groups per 20-ms frame and 4 power control groups per 20-ms frame. It is an easy exercise then to calculate the number of power control subchannels supported by these formats: • • For 8 power control groups per 20-ms frame, the F-CPCCH can support a total of 48 power control subchannels.
5 Channel Structure 31 consequence of having a longer interleaver size is that the system can combat fades of longer duration. This results in a better ability to correct burst errors coming from longer-term fades . Given their better error-protection properties, why are 40-ms and 80-ms frames not used in IS-95? The reason is that IS-95 is intended primarily for voice applications, and 20-ms frames are used is because speech statistics are nearly stationary (do not vary much) over a 20-ms interval.
3G CDMA2000 Wireless System Engineering by Samuel C. Yang