Performance of a Multiuser Cooperative IoT NOMA Network with
Battery-Assisted Energy Harvesting
Abstract
This paper investigates a cooperative non-orthogonal multiple access
(Co-NM) based network consisting of a multiantenna source, a full-duplex
energy harvesting (EH) near user (NU) internet-of-things (IoT) node and
multiple distant user (DU) IoT nodes. The source shares a direct link to
the NU, while the NU augments the harvested energy by a limited amount
of its battery energy to relay the information to the selected DU.
Considering time-switching (TS) or power-splitting (PS) protocol,
practical nonlinear EH, successive interference cancellation error, and
opportunistic Co-NM/OMA (OM) switching, closed-form expressions are
derived for the outage probability and throughput of both DU and NU. We
demonstrate that the proposed opportunistic Co-NM/OM switching can
ensure a performance similar to OM at the NU without loss in DU
throughput. Also, a joint optimal choice of battery energy and PS/TS
parameter helps in attaining a maximum energy efficiency (EE).
Moreover, Co-NM/OM switching ensures higher EE compared to Co-NM and
OM.