Frequency planning considerations for digital cellular systems

Cellular systems where interference is the limiting factor are discussed. In an interference-limited environment, two important system design parameters that directly affect the capacity of the overall system are the minimum carrier to cochannel interference ratio (C/I) and the maximum adjacent channel interference ratio (ACI) the system can tolerate without degrading the speech quality. For these reasons, Northern Telecom has proposed a digital cellular system that is capable of meeting the requirements that were set by members of the Cellular Telecommunication Industry Association (CTIA) for the digital cellular system. Worst-case figures for both C/I and ACI are computed for typical applications for both the forward and the reverse channels, with different reuse patterns, antenna configurations, and terrain. As a result, some frequency planning guidelines for the proper operation of the digital cellular system are presented.<>