By Samuel C. Yang
CDMA2000 is of serious curiosity to instant communications execs simply because this 3G (third iteration) normal presents for speedier information premiums, always-on info carrier, and better voice community skill. Breaking down complicated know-how into easy-to-understand options, this hands-on, system-level source bargains RF (radio frequency) and instant process engineers specialist counsel in designing, optimizing, and working a CDMA2000 instant community.
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Additional resources for 3G CDMA2000 : wireless system engineering
4 User Channels 27 ability to transmit short signaling messages in 5-ms frames as these other signaling channels. 2 Forward Fundamental Channel Frames In terms of carrying user traffic, in IS-95 the traffic channel can only support two radio configurations (or rate sets) and two peak data rates. 6 Kbps. 4 Kbps. 4 Kbps. Regardless of the radio configuration, an IS-2000 F-FCH can support only 20-ms and 5-ms frames. 9 shows some examples of F-FCH frames (at peak data rates) for the different radio configurations.
Sin(2πfct) BF: Baseband filter Complex modulation: Forward link. 15). 15 collapses back to that of IS-95. 16. In this case, I is the only symbol stream, which is duplicated on both the in-phase and the quadrature branches of the QPSK modulator. In fact, Radio Configurations 1 and 2 are implemented in IS-2000 by zeroing out the Q symbol stream. 16 Collapsed complex modulation as in the cases of Radio Configuration 1 and Radio Configuration 2. 7 Capacity Gain: Forward Link One reason IS-2000 has a higher physical layer capacity than IS-95 is because IS-2000 uses QPSK whereas IS-95 uses BPSK6.
6 Kbps. 5. Note that in this case, this F-CCCH frame has the same capacity as an IS-95 Rate Set 1 paging channel frame. 4 Kbps are also supported. 5 gives some examples of F-CCCH frame structures. 5 8 encoder tail bits Examples of 20-ms, 10-ms, and 5-ms F-CCCH frames. The F-CCCH can also be used in conjunction with the F-QPCH. Recall that the quick paging channel is a new physical channel used in IS-2000 to improve the efficiency of sending page messages. For example, a mobile does not have to monitor the F-CCCH all the time for page messages intended for it.
3G CDMA2000 : wireless system engineering by Samuel C. Yang