IRREDUCIBLE ERROR PERFORMANCE OF A DIGITAL PORTABLE COMMUNICATION-SYSTEM IN A CONTROLLED TIME-DISPERSION INDOOR CHANNEL

We investigated experimentally, analytically, and by simulation the ir reducible errors (i.e., error floor for high signal-to-noise ratio) in troduced by time dispersion in a slowly fading Rayleigh channel. We cr eated a multipath indoor propagation environment with controlled delay spread and validated this approach extensively. Our system is close t o the forthcoming DECT standard (Digital European Cordless Telecommuni cations) with 1 Mb/s GMSK-modulated signals being transmitted in FDM/T DMA/TDD format and received by a differential direct-conversion receiv er. Measured and simulated error probability floor is Pe is-approximat ely-equal-to 5 . 10(-3) as a consequence of delay spread which is 10% of the bit length. This value is well approximated by a closed-form an alytical description of phase jitter due to large group delay bursts. Simulation results obtained previously by others for comparable cases are, thus, partially corroborated, and partially disproved.