Solutions for minimum required forward link channel powers in CDMA cellular and PCS systems

New solutions are given for the minimum required transmitter powers for CDMA cellular or PCS systems for all categories of the forward link channels, namely pilot, sync, paging, and traffic channels. Any excess power over that required for the specified error performance of any channel category always reduces the user capacity, so it is necessary to know the minimum required power levels for all of the forward link channels. We show the solutions for the forward link channel powers by including fade margins to improve link reliability in lognormal shadowing. The amount of margin required to achieve a given reliability is calculated. We derive system capacity expressions as functions of link margins for specified reliability requirements and the corresponding minimum transmitter power levels. Example solutions are also presented in graphical forms for typical realistic operational parameters, to illustrate the use of the solution formulas. These solutions can be applied to maximize the capacity of a particular CDMA cellular or PCS system under different parametric situations.