Abstract
Power domain based multiple access scheme is introduced in this paper, namely Non-orthogonal multiple-access (NOMA). We deploy a wireless network using NOMA together with a wireless power transfer (WPT) scheme for dedicated user over Nakagami-$m$ fading channel. When combined, these promising techniques (NOMA and WPT) improve the system performance in term of ergodic performance at reasonable coefficient of harvested power. However, fixed power allocation factors for each NOMA user can be adjusted at the base station and it further provide performance improvement. We design a new signal frame to deploy a NOMA scheme in WPT which adopts a linear energy harvesting model. The ergodic capacity in such a NOMA network and power allocation factors can be updated frequently in order to achieve a fair distribution among NOMA users. The exact expressions of ergodic capacity for each user is derived. The simulation results show that an agreement between analytic performance and Monte-Carlo simulation can be achieved.
Highlights
Unlike in [14]-[23], in this work, we focus on the new non-orthogonal multiple access (NOMA) scheme, employing a wireless power transfer to exhibit the feedback of power allocation factors in NOMA to the base station (BS) in a wireless system
The main contributions of this paper can be shown as: − In this paper, we aim to satisfy the fairness in a resource allocation in NOMA, we provide information related to power allocation factor in uplink and the performance of downlink in NOMA is studied. − Energy harvesting is deployed in NOMA to help mobile users reuse the harvested power to provide signal transmission in uplink
The energy harvesting policy provides more opportunities to prolong the lifetime of the operation of users in considered NOMA scheme
Summary
Multiple access has raised much interest. A multiple access can be performed on a power domain with different power allocations for individual users. This system model deploys a time-splitting relaying mode to perform the wireless charge for the mobile users who suffer limited power input. The mobile nodes are able to collect wireless power while requiring only a finite amount of energy for their information transmission to provide feedback of power allocation factors to the BS in uplink This advantage of energy harvesting can be exploited for the small devices requiring only a small amount of energy. To evaluate the system performance once energy harvesting and feedback information for power allocation factors have been combined, we consider a metric, namely the ergodic rate. Downlink is the main transmission which needs be investigated in term of the ergodic rate of the system in both NOMA and OMA schemes This consideration is evaluated over a system model using an independent Rayleigh fading channel. We can obtain the closed-form expression of sum ergodic rare for considered system RNM as RN M αd ln 2
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