Modeling of licensed PCS self-interference

Self-interference in personal communications services (PCS) systems is a real and acknowledged problem in both urban and rural areas. If left unresolved, it can impact the quality of service and system capacity. Self-interference is of particular interest to the commercial PCS industry, as more systems are being developed and implemented in already saturated areas. Since commercial PCS services are being considered for use in national security/emergency preparedness (NS/EP) situations, self-interference is becoming a concern of government and military agencies. A model of self-interference in PCS systems, which is applicable to other cellular, wireless technologies, has been developed by the Institute for Telecommunication Sciences (ITS). The developed methodology was applied to two existing PCS technologies: PCS 1900 (a narrowband time division multiple access (TDMA) system based on Global System for Mobile (GSM)), and IS-95-based code division multiple access; application to the remaining second-generation, as well as proposed second-and-a-half-and third-generation technologies is currently under way. The system-specific models are used to produce output noise and interference waveforms suitable for implementation in a real-time hardware channel simulator, or as a component of higher-level software simulations and models. Example outputs are given for simulations of both technologies, with corresponding statistical analyses of the noise and interference waveform properties. The models are particularly well-suited for independent PCS system evaluation by other Federal agencies, system manufacturers, and service providers.