se station for each place, we want the second best, third best, fourth best, and so on. These calculations help us understand how efficiently 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. Measuring System Performance for Growth Increasing Capacity CDMA can serve the subscriber demand. The fourth-pilot delta described in Sec. 32.1 is determined by comparing the best radio path and the fourth-best path. The CDMA carrier performs best when there is a single best-serving antenna face and all the oth- ers have far lower radio path gain. When the first and fourth radio paths are close, CDMA carrier experiences pilot pollution and does not perform at its best. For each (x, y) location in the service area, we want to know the best radio path base station, but we also want to know any radio path to a base station that is close, within 10 dB. We can find this out from the live system by driving or walking around and making radio measurements. We use specialized measurement equipment de- signed to find the strongest CDMA signals. These measurement terminals have the same kinds of radio receivers as user terminals, but they probably do not make tele- phone calls. 1 It is important that we measure areas representative of actual traffic. If our subscribers are shopping in the stores, then we do not want to make our mall mea- surements in the parking lot. And we will need to get inside the office buildings that represent the bulk of our business traffic. For each location we reach as we move around, the measurement terminal reports its location, using the Global Positioning System (GPS), and the best serving base sta- tion. In this way, we actually measure what cell each location is in. We also want the base stations that are not the best radio path but are close. These are the sources of pi- lot pollution in our CDMA planning process. An ongoing process