3 research outputs found
Outage Performance of Generalized Cooperative NOMA Systems with SWIPT in Nakagami-m Fading
This paper investigates cooperative non-orthogonal multiple access (NOMA) with simultaneous wireless informationand power transfer (SWIPT) radio networks. A decode-andforward relay deserves a base station to transmit informationto two users. Two access schemes are addressed: direct andrelay assisted transmission (DRAT) where a line-of-sight existsbetween the source and destination, and non-direct and relayassisted transmission (nDRAT) where the only access to the finalusers is through the relay. New closed-form expressions of outageprobability are derived at these schemes. A generalization usingNakagami-m fading channels in considered, in order to present acomplete cover of relayed NOMA systems with energy harvestingbehavior in small scale fading.We consider the impact of time splitting fraction, power allocation and channel parameters on system maintainability andevaluate its maximum data rate transmission with full autonomy.By comparing the two schemes, cooperative NOMA with energyharvesting (EH) in nDRAT scenario outperforms transmissionwith direct link in terms of outage probability and transmissiondata rate
Outage Performance of Generalized Cooperative NOMA Systems with SWIPT in Nakagami-m Fading
This paper investigates cooperative non-orthogonal multiple access (NOMA) with simultaneous wireless informationand power transfer (SWIPT) radio networks. A decode-andforward relay deserves a base station to transmit informationto two users. Two access schemes are addressed: direct andrelay assisted transmission (DRAT) where a line-of-sight existsbetween the source and destination, and non-direct and relayassisted transmission (nDRAT) where the only access to the finalusers is through the relay. New closed-form expressions of outageprobability are derived at these schemes. A generalization usingNakagami-m fading channels in considered, in order to present acomplete cover of relayed NOMA systems with energy harvestingbehavior in small scale fading.We consider the impact of time splitting fraction, power allocation and channel parameters on system maintainability andevaluate its maximum data rate transmission with full autonomy.By comparing the two schemes, cooperative NOMA with energyharvesting (EH) in nDRAT scenario outperforms transmissionwith direct link in terms of outage probability and transmissiondata rate
Joint Power-control and Antenna Selection in User-Centric Cell-Free Systems with Mixed Resolution ADC
In this paper, we propose a scheme for the joint optimization of the user
transmit power and the antenna selection at the access points (AP)s of a
user-centric cell-free massive multiple-input-multiple-output (UC CF-mMIMO)
system. We derive an approximate expression for the achievable uplink rate of
the users in a UC CF-mMIMO system in the presence of a mixed analog-to-digital
converter (ADC) resolution profile at the APs. Using the derived approximation,
we propose to maximize the uplink sum rate of UC CF-mMIMO systems subject to
energy constraints at the APs. An alternating-optimization solution is proposed
using binary particle swarm optimization (BPSO) and successive convex
approximation (SCA). We also study the impact of various system parameters on
the performance of the system