r is the cell count increase for coverage. Unlike conventional reuse systems, capacity and coverage play against each other in a CDMA system: Big- ger cells have less capacity. 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. Estimating Wireless Telephone Demand Planning for CDMA Capacity The result of the calculations in this chapter are geographic maps of time-of-day de- mand for voice, data, and other services. From these, we derive an initial cell count. 31.5 Conclusion In this chapter we have illustrated the process of moving from a business and market- ing plan to the beginning of an engineering plan for a CDMA cellular system. With geo- graphic maps that plot time-of-day demand and an initial cell count, we are ready to take the next step: planning locations for base stations. 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. Source: CDMA CAPACITY AND QUALITY OPTIMIZATION Chapter Planning Locations for Base Stations Once we estimate the demand for wireless services and derive the appropriate number of cells for a given region, we then need to decide where to put the base station at the center of each of those cells. Base station location is a compromise between the ideal placement for managing interference and practical concerns of site cost, installation time, and ease of maintenance. 32.1 Pilot Pollution The code division multiple access (CDMA) air interface is a complicated beast, and the capacity of a CDMA carrier depends on many factors. Even in simplified form, the es- timates of CDMA capacity depend on many factors, as we saw in Sec. 30.7. Besides the obvious factors of bit rate and bit error rate (BER), the capacity depends on overhead, power control, orthog