Rate analysis of two-receiver MISO broadcast channel with finite rate feedback: A rate-splitting Approach

Chenxi Hao, Yueping Wu, Bruno Clerckx

Research output: Contribution to journalArticlepeer-review

108 Citations (Scopus)


To enhance the multiplexing gain of two-receiver Multiple-Input-Single-Output Broadcast 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, and superposes the common message on top of Zero-Forcing precoded private messages. In this paper, with quantized CSIT, we study the ergodic sum rate of two schemes, namely RS-S and RS-ST, where the common message(s) are transmitted via a space and space-time design, respectively. Firstly, we upper-bound the sum rate loss incurred by each scheme relative to Zero-Forcing Beamforming (ZFBF) with perfect CSIT. Secondly, we show that, to maintain a constant sum rate loss, RS-S scheme enables a feedback overhead reduction over ZFBF with quantized CSIT. Such reduction scales logarithmically with the constant rate loss at high Signal-to-Noise-Ratio (SNR). We also find that, compared to RS-S scheme, RS-ST scheme offers a further feedback overhead reduction that scales with the discrepancy between the feedback overhead employed by the two receivers when there are alternating receiver-specific feedback qualities. Finally, simulation results show that both schemes offer a significant SNR gain over conventional single-user/multiuser mode switching when the feedback overhead is fixed.

Original languageEnglish
Article number7152864
Pages (from-to)3232-3246
Number of pages15
JournalIEEE Transactions on Communications
Issue number9
Publication statusPublished - 2015 Sept 1

Bibliographical note

Publisher Copyright:
© 1972-2012 IEEE.

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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