d busiest areas are fairly hostile, so m = 0.3 is our estimate for this chip rate. In computing the values in Table 30.4 (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. We did not perform a separate set of calcu- lations for cdma2000 3x because, although it supports higher data rates, it does SO by operating at greater bandwidth. As a result, the capacity for cdma2000 3x data (whether multicarrier or single carrier) is the same as the capacity for cdma2000 1x data when measured in erlangs per megahertz per cell. 30.7.3 W-CDMA The chip rate W is 3.84 megachips per second, and the voice bit rate we are using for this calculation is the information rate R set to 4.8 kbps, with Eb/No set to 4.5 dB, the lowest AMR bit rate, with rate 1/2 FEC. The speech coder will use its lowest data rate when the system is reaching its capacity limit. The data example has R set to 160 kbps, with Eb/No set to 9 dB for rate 1/3 FEC and 10-5 BER. We continue to split the Doppler difference with d = 1 dB, with some subscribers sta- tionary, d = 0 dB, and others moving, d = 2 dB. Our data subscribers are likely to be less mobile, so we set their Doppler factor to d = 0.5 dB. We are estimating other-cell interference at one-half the power of the serving CDMA carrier, f = 0.5, and other- 6This also includes some improvement due to cdma2000's better processing of soft-handoff signals. 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 Issues Specific to CDMA TABLE 30.4 cdma2000 Summary Parameter values in CDMA capacity estimation Eg/No, Direction Mchps kbits cdma2000 voice 1.2288 cdma2000 voice 1.2288 cdma2000 data 1.2288 160.0 cdma2000 data 1.2288 160.0 CDMA capacity estimates One-way Forward Reverse erlan