Joint of full-duplex relay, non-linear energy harvesting and multiple access in performance improvement of cell-edge use
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Joint of full-duplex relay, non-linear energy harvesting and multiple access in performance improvement of cell-edge user in heterogeneous networks Dinh-Thuan Do1
•
Chi-Bao Le2 • Anh-Tu Le2
Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract To serve massive connections in heterogeneous networks with respect to higher energy efficiency, we focus on new paradigm in order to achieve multiple access and performance improvement at cell-edge area. The power domain based non-orthogonal multiple access is introduced to address such problem. In particular, this paper studies a self-energy relay together with full-duplex scheme to implement cooperative power domain based non-orthogonal multiple access in smallcell system of the heterogeneous networks. In such small-cell network, a nearby user can be employed as a decode-andforward with self-energy recycling protocol to assist a far power domain based non-orthogonal multiple access user (celledge user). The relay harvests energy from dedicated energy signal sent by a base station, while it still reuses energy from loop self-interference signal. To characterize the performance of the proposed system with respect to where meets weak signal condition, numerous expressions of exact outage probability for far power domain based non-orthogonal multiple access user is derived. Several practical scenarios are performed in three different schemes related to how energy harvesting architecture can be achieved. Based on analytical results, the optimal throughput achieved by the cell-edge user in small-cell network can be observed. Numerical results are presented to validate the accuracy of the derived results. Keywords Non-orthogonal multiple access Cell-edge Small-cell Full-duplex relay Energy harvesting
1 Introduction Increasing demand for the Internet of Things (IoT) deployed in the fifth generation (5G) requires to design of new paradigm in large-scale heterogeneous data traffic with respect to higher spectrum efficiency and improved system throughput. In particular, as a promising techniques, namely Power Domain based Multiple Access & Dinh-Thuan Do [email protected] Chi-Bao Le [email protected] Anh-Tu Le [email protected] 1
Wireless Communications Research Group, Faculty of Electrical & Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
2
Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City, Vietnam
(PDMA) or so-called as Non-orthogonal multiple access (NOMA), and it exhibits advantage of enhanced spectrum efficiency for the 5G networks [1–5]. Developing from traditional orthogonal multiple access (OMA), but NOMA only deploys the same time/frequency/code domain with different power domain to facilitate the multiple users who intend to multiplex their signals. As a key characteristic of NOMA, the superposition coding is employed at the transmitter while detecting signal based on the successive interference cancel
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