at BER requires an Eb/No of about 4.2 dB. Counting the factor of 3 (4.8 dB) for the rate 1/3 FEC, this gives us an equivalent Eb/No of 9 dB. In the sections that follow we discuss the assumptions that generate these capacity estimates. It is important to be clear that these are estimates rather than experimen- tal results. For cdmaOne, definite figures derived from experimental results are beyond the scope of this book because results will vary with different proprietary equipment. For 3G systems, experimental results do not yet exist because the systems have not yet been deployed. 30.7.1 cdmaOne 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 R set to 9.6 kbps with Eb/No set to 5.0 dB in the 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 30.3 cdmaOne Summary Parameter values in CDMA capacity estimation Eb/No, Direction Mchps kbits cdmaOne 1.2288 cdmaOne 1.2288 CDMA capacity estimates One-way Forward Reverse erlangs capacity capacity Erlangs Erlangs Limiting for one sector per MHz sector sector direction carrier 20 MHz per cell cdmaOne Reverse 317.0 forward direction and 7.5 dB in the reverse direction. Rate set 1 (RS1) uses a rate 1/2 FEC, so the equivalent coded numbers would be R = 19.2 kbps and Eb/No set to 2.0 dB. We believe that most users will be using the lower-bit-rate RS1 enhanced variable-rate codec (EVRC) speech coder rather than the higher-bit-rate RS2 coder, which does not sound much better. Stationary subscribers have d = 0 dB, and moving subscribers have d = 2 dB, an ex- tra 2 dB of Eb/No requirement. We decided to split the difference with d = 1 dB with some subscribers stationary and others moving. We are estimating other-cell interfer- ence at one-half the power of the ser