Tandem Spreading Multiple Access With MIMO

Jiming Dai

doi:10.1109/JIOT.2023.3283060

Tandem Spreading Multiple Access With MIMO

2023-11-15

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DOI：10.1109/JIOT.2023.3283060

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With the massive deployment of 5G commercial applications, the Internet of Everything promotes the transformation and upgrading of the society production mode. The Internet of Things (IoT) is supported by the massive Machine-Type Communications (mMTCs), which is one of the three major application scenarios of 5G. Recently, a novel spreading-based nonorthogonal multiple access (NOMA) scheme named tandem spreading multiple access (TSMA) has been proposed for grant-free random access in mMTC. However, TSMA only considers the case of single antenna, the connectivity expansion on spatial domain has not been considered. In this article, a multiantenna system scheme of TSMA (MIMO-TSMA) is proposed to scale up user connections. In this scheme, spectrum efficiency can be promoted by sharing the time-frequency resources in different beams. In the meantime, scheme against channel deep fading is considered in this work. The simulation results show that MIMO-TSMA can effectively take advantage of multiple-input-multiple-output and TSMA to enhance the mMTC system performance.

Keywords:

Encoding

Internet of Things

MIMO communication

NOMA

Termination of employment

Symbols

Rail transportation

Internet of Things (IoT)

massive Machine-Type Communications (mMTC)

tandem spreading multiple access (TSMA)

Tandem Spreading Multiple Access With MIMO

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