An Efficient Rate Splitting Precoding Approach in Multi-User MISO FDD Systems
arxiv(2024)
摘要
In this work, we develop an efficient precoding strategy for a multi-user
multiple-input-single output (MU MISO) system operating in
frequency-division-duplex (FDD) mode, where rate splitting multiple access
(RSMA) is implemented. To this end, we consider one-layer RS and show its
significant impact on the system performance, specifically in the case where
the channel state information (CSI) is incomplete at the transmitter. Based on
a lower bound on the achievable rate that takes into account the CSI errors, we
establish an augmented weighted average mean squared error (AWAMSE) algorithm
for the RS setup denoted by AWAMSE-RS, where even the updates for the common
and the private precoders are computed via analytical expressions, hence
circumventing the need for interior-point methods. Simulation results validate
the efficiency of our approach in terms of computational time and its
competitiveness in terms of the achievable system throughput compared to
state-of-the-art methods and non-RS setups.
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