Abstract
Methods of non-orthogonal multiple access are a promising group of techniques that allow increasing the noise immunity of communication and the number of network connections. One of the implementation techniques of this approach is sparse code multiple access (SCMA). The use of SCMA in conjunction with multiple-input multiple-output (MIMO) systems allows for a high level of noise immunity and spectral efficiency and can be a concept for organizing the physical layer of 6G networks. In this article we look at different MIMO-SCMA circuits and give the basic steps of signal formation and processing. One of the problems in implementing SCMA-MIMO is the high computational complexity of signal processing algorithms in the receiver. To solve this problem, we suggest using a method based on QR-decomposition. In the article, we demonstrate that this method makes it possible not only to reduce computational complexity by several times but also to provide higher noise immunity compared to classical approaches. The results are obtained for various MIMO configurations and modes. The proposed method can be used in promising communication systems of future generations.
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