495 research outputs found
Fundamental Limits on the Uplink Performance of the Dynamic-Ordered SIC Receiver
Due to the rapid and widespread growth of the Internet-of-Things (IoT) paradigm, present
days witness an exponential increase in the number of connected devices. In this regard, the orthogonal
transmission techniques featured by conventional 4G and 5G systems can only support a limited number of
simultaneously active users, due to their low spectral efficiency and poorly flexible resource allocation. To
overcome such limitations, the 6G framework will include novel Next Generation Multiple Access (NGMA)
solutions that will efficiently and flexibly connect a significantly larger number of devices over the same
portion of spectrum. Under the NGMA umbrella, the Power-Domain Non-Orthogonal Multiple Access
(PD-NOMA) technology is able to accommodate multiple users on the same frequencies by carefully
assigning different power levels to the active users and employing Successive Interference Cancellation
(SIC) receivers. In this work, we put forth a novel analytical approach to evaluate the performance that
PD-NOMA achieves on the uplink of a single cell when a dynamic-ordered SIC receiver is considered.
With respect to other existing works, the fundamental limits on the system performance are assessed
analytically for an arbitrary number = of simultaneously transmitting users, and both the case of Rayleigh
and lognormal-shadowed Rayleigh fading are examined. The closed-form expressions presented in this
work, whose correctness and excellent accuracy are validated through Monte Carlo simulations, disclose
the impact of lognormal shadowing and an increasingly larger number of active users on the PD-NOMA
performance
Discrete event simulation of wireless cellular networks
Postprint (published version
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