Abstract

This paper considers a time division duplex (TDD) extension applied to a conventional frequency division duplex (FDD) CDMA cellular system. The FDD-CDMA cellular system is overlaid by small TDD-CDMA cells which can cover capacity hot-spots such as in offices and public buildings. The TDD-CDMA base stations have lower complexity than the FDD-CDMA base stations and are able to support asymmetric traffic at high bit rates.

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