Journal Articles - Engineering Technology - 2019

Permanent URI for this collection

http://repository.vlu.edu.vn:443/handle/123456789/162

Browse

Browsing Journal Articles - Engineering Technology - 2019 by Author "Miroslav Voznak"
  • Publication
    Cognitive Radio Assisted Non-Orthogonal Multiple Access: Outage Performance
    ( 2019)
    Hong-Nhu Nguyen
    ;
    Si-Phu Le
    ;
    Chi-Bao Le
    ;
    Ngoc-Long Nguyen
    ;
    Nhat-Tien Nguyen
    ;
    Dinh-Thuan Do
    ;
    Miroslav Voznak
    In this paper, the performance of overlay cognitive radio (CR) in secondary networks as utilizing non-orthogonal multiple access (NOMA) is examined. We consider transmission quality from the relay to the far NOMA users who expect to multiple access to core network. In this system model, weak users who have weak signal and weak channel condition are focused on. Our proposal analysis contributes to improve the outage performance of far NOMA end-users. We first identify signal to noise ratio (SNR) to discover separated signal for each user, and exact expressions of outage probability is examined in assumption that receiver can delete the interference with successive interference elimination completely. Then, we determine outage and throughput performance based on the noise ratio signal (SNR) achiveved. Theoretical and simulation results prove that the both proposed models can attain the outstanding performance enhancement in secondary network for far NOMA users.
  • Publication
    Enabling D2D Transmission Mode with Energy Harvesting and Information Transfer in Heterogeneous Networks
    ( 2018)
    Hong Nhu Nguyen
    ;
    Huu Phuc Dang
    ;
    Si Phu Le
    ;
    Thanh Duc Le
    ;
    Dinh Thuan Do
    ;
    Miroslav Voznak
    ;
    Jaroslav Zdralek
    The concept of energy harvesting-assisted relay has been introduced to support the relaying transmission using Device-to-Device (D2D) communications for enhancing communication reliability. Motivated by the recent advance in Heterogeneous Network (HetNet) using relaying techniques, we consider the D2D communication provided by Energy Harvesting (EH) assisted relay where signal is forwarded from a Base Station (BS) to the conventional cellular user (non-D2D user) and D2D user. We first derive the outage probability by taking into account the SNR and power allocation parameters, and propose the transmission mode for D2D link as well as non-D2D link. After deriving the outage probability of the D2D-HetNet, we explore the effects of the network parameters on the outage probability and throughp
  • Publication
    Exploitting Performance Of Miso Based Non-Orthogonal Multiple Access
    ( 2019)
    Si-Phu Le
    ;
    Chi-Bao Le
    ;
    Hong-Nhu Nguyen
    ;
    Ngoc-Long Nguyen
    ;
    Nhat-Tien Nguyen
    ;
    Dinh-Thuan Do
    ;
    Miroslav Voznak
    This paper examines non-orthogonal multiple access (NOMA) and explores the effect of multiple antenna equipped at base station to serve many users who expect to multiple access to core network. This system model using multiple input single output (MISO) contributes enhancement on the outage performance of two NOMA end-users. We first introduce a simple model of power distribution to NOMA users who use both direct link and relay link to improve quality of transmission. Inspired by NOMA strategy, we then identify signal to noise ratio to discover separated signal for each user, and exact expressions of outage probability are developed in assumption that receiver can eliminate the interference completely with successive interference cancellation. Theoretical and simulation results show that the both suggested models can achieve the remarkable performance improvement of two NOMA users