A very important aspect that must be considered in the dimensioning and planning of a cellular mobile and acess radio communication systems is the coverage prediction. The technical literaute several methods of calculations have been proposed. The coverage calculation of wireless systems, and its optimization, require the development of computer programs, that are powerful tools for systems planning. In this work, a wide range of factors that must be considered in the planning of wireless systems are analyzed, with emphasis in the development of algorithms for coverage prediction in WLL (Wireless Local Loop) and LMDS systems. The results are presented and several factors, which have influence in the coverage area of these systems, are analyzed. The algorithms were implemented with help of programmers, in the NETDimension software, and examples of design of radio acess systems developed usign the software are presented.