Properties of a TDMA pico cellular office communication system

The properties of a TDMA/TDD (time-division multiple-access/time-division duplex) pico cellular cordless telephone system using decentralized dynamic channel allocation and handover are presented. The system has 16 time-division time-duplex channels (slots) per carrier, each occupying 2 MHz. The TDMA frame is 16-ms long, and each slot has bits for synchronization, signaling and data. The data speed is suited for 32-kb/s speech codecs. Procedures have been developed for efficient and quick dynamic channel allocation and handover, using the fact that one single radio can simultaneously monitor or communicate on all 16 channels. Simulations for a specific six-storeyed building indicate that 16 channels can provide wireless communication for up to 30% of the telephones, and 32 channels for up to 100% of the telephones. Tests show that no time dispersion equalizers are needed, and that antenna diversity is effective against fading dips and time dispersion.<<ETX>>