Performance Enhancement of Cooperative MIMO-NOMA Systems Over Sub-6 GHz and mmWave Bands

Authors

  • Ahmed A. Saleh College of Electronics Engineering, Ninevah University, Mosul, Iraq
  • Mohamad A. Ahmed College of Electronics Engineering, Ninevah University, Mosul, Iraq https://orcid.org/0000-0001-6412-2275

DOI:

https://doi.org/10.26636/jtit.2023.170023

Keywords:

error probability, MIMO, mmWave, NOMA, out-age probability, power allocation factor, successive-interference cancellation (SIC)

Abstract

In this paper, two radio links with different frequency bands are considered for base stations (BS) serving users via decode-and-forward (DF) cooperative relays. Backhaul and access links are proposed with sub-6 GHz and millimeter wave (mmWave) bands, respectively. Non-orthogonal multiple access (NOMA) is employed in the backhaul link to simultaneously transmit a superposed signal in the power domain, using the same band. The superposed signals, containing two signals that differ in terms of power allocation factors (PAFs), are designed for two selected DF relays in the BS. The two relays are chosen from several relays to be serviced by the BS based on a pairing algorithm that depends on different users’ circumstances. The furthest DF relay detects the incoming NOMA signal directly, while the nearest one applies successive interference cancellation (SIC) before extracting its signal. Each DF relay forwards the detected signals toward their intended users over mmWave channels. Three performance metrics are utilized to evaluate the system’s performance: outage probability, achievable throughput, and bit error rate. Comparisons between two mmWave bands in the access link (28 and 73 GHz) are made to demonstrate the superiority of the 28 GHz band in terms of the three performance-related metrics.

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Published

2023-06-29

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No. 2 (2023)

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How to Cite

[1]
A. A. Saleh and M. A. Ahmed, “Performance Enhancement of Cooperative MIMO-NOMA Systems Over Sub-6 GHz and mmWave Bands”, JTIT, vol. 92, no. 2, pp. 70–77, Jun. 2023, doi: 10.26636/jtit.2023.170023.