Bit error probabilities in a two-rate communication system

We examine a two-rate communication system where the transmission is suspended if the received SNR falls below a given threshold. We assume an FDD system and derive novel closed-form bit error probabilities in the presence of feedback errors in flat Rayleigh fading environment for single antenna transmission, orthogonal space-time block coding and transmit antenna selection. A single-user two-rate system would result in an infrequent use of the channel and long delays, but combined with a physical layer multiuser scheduler like in the high speed downlink packet access scheme included in the 3GPP WCDMA Release 5 specification the overall channel utilization can be improved.