Abstract
This work considers multiple user power-domain non-orthogonal multiple access (NOMA)-based downlink (DL) and uplink (UL) communication systems with potentially dissimilar fading links for all the users that can follow one of several possible distributions such as Rayleigh, Rician, Nakagami- $m$ , Nakagami- $q$ , $\kappa -\mu $ , $\eta -\mu $ , Nakagami-lognormal. The presented analysis, which is based on approximating the probability density function (PDF) of the channel gain as a sum of Gamma distributions, is sufficiently general and applicable in a multitude of NOMA scenarios. For both the UL and DL, closed-form expressions are determined for the outage probability at the users considering both statistical channel state information (CSI)-based as well as instantaneous CSI-based ordering techniques. Analytical expressions for the outage probability and the ensuing diversity orders have also been obtained for the NOMA DL system at high SNRs. Furthermore, similar expressions for the outage probability and outage floor for the NOMA UL system have been derived at high SNRs. Finally, simulation results have been presented to authenticate the analytical results derived and provide insights into the NOMA system performance.
Highlights
A major challenge in the fifth generation (5G) wireless communication networks is to support the massive number of connected devices with low communication latencies and enhanced data rates [1]
We present the outage probability analysis of a DL non-orthogonal multiple access (NOMA) system considering statistical as well as instantaneous channel state information (CSI)-based ordering schemes described in sections II-A1 and II-A2, respectively
This work considered NOMA UL and DL communication systems wherein multiple users communicate with a single base station (BS)
Summary
A major challenge in the fifth generation (5G) wireless communication networks is to support the massive number of connected devices with low communication latencies and enhanced data rates [1]. Outage performance analysis for a paired two user NOMA DL system with Nakagami-m fading channel links and instantaneous CSI-based user ordering has been presented by Hou et al in [7]. In [10], Yang et al have presented the outage probability and sum rate performance analysis for a NOMA DL system considering partial CSI-based user ordering of uniformly distributed users over Rayleigh fading channel links. The PDFs of the channel gains of the users have been approximated as mixtures of Gamma (MG) distributions These approximations have been employed to obtain closed-form expressions for the net outage probability for all the users considering statistical CSI-based user ordering in the DL. Γ(·) is the Gamma function and Iv (·) is the modified Bessel function of the first kind and order v
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