ving CDMA carrier, f = 0.5, and other-sector in- terference at 30 percent of that same power, g = 0.3. We estimate the forward-direction overhead of global pilot, power control, and signaling to be one-tenth the total voice channel power, so h = 0.1 in the forward direction. The reverse direction has no pilot and has negligible power-control information, SO h = 0.0. Power control is slow in the forward direction, so we use p = -2 dB to reflect the inefficiency of power often being out of balance. The reverse direction uses rapid power control, so we set p = dB. The four-rate speech coder in cdmaOne and cdma2000 allows the channel to be ag- gressive in conserving voice call activity, so we set U to 0.4. If half the system is in a state of soft handoff or softer handoff and half of those calls involve three or four sec- tors, then the soft-handoff factor used in the forward direction should be about S = 0.8. Orthogonal codes give us j = 0 in the forward direction and j = 1 in the reverse direc- tion because cdmaOne has no JD in the base station receiver. Finally, the multipath factor depends heavily on the radio environment, and we are figuring that the densest and busiest areas are fairly hostile, so m = 0.3 is our estimate for this chip rate. In computing the values in Table 30.3 (the same as those in Tables 30.1 and 30.2), we put these parameters into Eqs. (30.1) and (30.2). We used three-sector cells and 16 carriers in 20 MHz for these calculations. These values are consistent with the reported experience of engineers using cdmaOne in practice. 30.7.2 cdma2000 1x The chip rate W is 1.2288 megachips per second, and the voice bit rate we are using for this calculation is the information rate of R set to 9.6 kbps, the same EVRC speech Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Capacity Issues Specific to CDMA Capacity and Quality Princip