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To enhance the multiplexing gain of two-receiver Multiple-Input-Single-OutputBroadcast Channel with imperfect channel state information at the transmitter(CSIT), a class of Rate-Splitting (RS) approaches has been proposed recently,which divides one receiver's message into a common and a private part, andsuperposes the common message on top of Zero-Forcing precoded private messages.In this paper, with quantized CSIT, we study the ergodic sum rate of twoschemes, namely RS-S and RS-ST, where the common message(s) are transmitted viaa space and space-time design, respectively. Firstly, we upper-bound the sumrate loss incurred by each scheme relative to Zero-Forcing Beamforming (ZFBF)with perfect CSIT. Secondly, we show that, to maintain a constant sum rateloss, RS-S scheme enables a feedback overhead reduction over ZFBF withquantized CSIT. Such reduction scales logarithmically with the constant rateloss at high Signal-to-Noise-Ratio (SNR). We also find that, compared to RS-Sscheme, RS-ST scheme offers a further feedback overhead reduction that scaleswith the discrepancy between the feedback overhead employed by the tworeceivers when there are alternating receiver-specific feedback qualities.Finally, simulation results show that both schemes offer a significant SNR gainover conventional single-user/multiuser mode switching when the feedbackoverhead is fixed.

Rate Analysis of Two-Receiver MISO Broadcast Channel with Finite Rate Feedback: A Rate-Splitting Approach