# Study of Rate-Splitting Techniques with Block Diagonalization for Multiuser MIMO Systems

## TL;DR

This paper explores rate-splitting combined with block diagonalization in multiuser MIMO systems, proposing new precoding techniques and analyzing their performance under imperfect channel information.

## Contribution

It introduces a novel linear precoding scheme based on block diagonalization for rate-splitting in multiuser MIMO systems, with performance analysis and simulation results.

## Key findings

- Proposed schemes outperform conventional precoding methods.
- Closed-form sum rate expressions derived.
- Enhanced common rate with combining techniques.

## Abstract

In this work, we investigate Block Diagonalization (BD) techniques for multiuser multiple-antenna systems using rate-splitting (RS) multiple access. In RS multiple access the messages of the users are split into a common part and a private part in order to mitigate multiuser interference. We present the system model for a RS multiple access system operating in a broadcast channel scenario where the receivers are equipped with multiple antennas. We also develop linear precoders based on BD for the RS multiple access systems along with combining techniques, such as the min-max criterion and the maximum ratio combining criterion, to enhance the common rate. Closed-form expressions to describe the sum rate performance of the proposed scheme are also derived. The performance of the system is evaluated via simulations considering imperfect channel state information at the transmitter. The results show that the proposed schemes outperform conventional linear precoding methods.