Joint STBC and Pre-Filtering Technique for MISO TDD Downlink MC-CDMA Systems

The paper considers downlink space-time block coding with a pre-filtering technique for time division duplex MCCDMA. We consider the use of antenna arrays at the base station (BS) and a single antenna at the mobile terminal. The space-time block codes allow that the spatial diversity be efficiently exploited and the multi-user pre-filtering technique allows to format the transmitted signals so that the multiple access interference at mobile terminals is reduced without enhancing the noise power, allowing to transfer the most computational complexity from mobile terminal to the base station. Simulations results are carried out in scenarios with spectral efficiency equal 2, 3 and 4 bps/Hz without channel coding and 1.5, 2 bps/Hz with UMTS channel turbo code, to demonstrate the effectiveness of the proposed joint STBC and multi-user pre-filtering algorithm in a high data rate context.