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Time-Division Multiple Access (TDMA) with Transmit Antenna Selection (TAS) is a simple and feasible transmission scheme for broadcast multiple-input single-output (BC-MISO) channels. Compared to other more complex strategies, TAS exhibits two important advantages: The required channel knowledge at the transmitter is relatively low and it only needs a single radio-frequency chain at the transmitter. In this work the author analyzes the performance of TAS in BC-MISO channels. The paper derives simple exact closed-form expressions for the achievable sum rate of TDMA-TAS in asymmetric BC-MISO ergodic Rayleigh channels, as well as closed-form expressions for the resulting individual users' rates. Using these expressions the paper compares the achievable sum-rate of TAS with two more complex schemes: dirty paper coding and TDMA with transmit beamforming.
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