A Picocellular CDMA/TDD Overlay on GSM
Piotr Kaczorek, Dominik A. Rutkowski · 2000
To improve the utilisation of frequency bands assigned to GSM system, an idea of CDMA overlay seems to be interesting. In this paper a picocellular CDMA/TDD overlay on GSM system has been considered. It is corresponding to a TDD mode of WCDMA proposed by ETSI, ARIB and TIA for the future third generation UMTS/I1vTT2000 system. The overlay is proposed for indoor operation in the area of macrocell of GSM system. As it turns out the implementation of overlay can significantly increase the spectrum efficiency in the frequency band that is shared by GSM system and the overlay. The picocellular CDMA/TDD overlay can be used both for speech and data transmission.