Preprint Communication Version 1 Preserved in Portico This version is not peer-reviewed

Hybrid Active-and-Passive Relaying Model for 6G-IoT Greencom Networks with SWIPT

Version 1 : Received: 28 July 2021 / Approved: 29 July 2021 / Online: 29 July 2021 (14:30:56 CEST)

A peer-reviewed article of this Preprint also exists.

Gautam, S.; Solanki, S.; Sharma, S.K.; Chatzinotas, S.; Ottersten, B. Hybrid Active-and-Passive Relaying Model for 6G-IoT Greencom Networks with SWIPT. Sensors 2021, 21, 6013. Gautam, S.; Solanki, S.; Sharma, S.K.; Chatzinotas, S.; Ottersten, B. Hybrid Active-and-Passive Relaying Model for 6G-IoT Greencom Networks with SWIPT. Sensors 2021, 21, 6013.

Journal reference: Sensors 2021, 21, 6013
DOI: 10.3390/s21186013

Abstract

In order to support a massive number of resource-constrained Internet-of-Things (IoT) devices and machine-type devices, it is crucial to design future beyond 5G/6G wireless networks in an energy-efficient manner while incorporating suitable network coverage expansion methodologies. To this end, this invited paper proposes a novel two-hop hybrid active-and-passive relaying scheme to facilitate simultaneous wireless information and power transfer (SWIPT) considering both the time-switching (TS) and power-splitting (PS) receiver architectures, while dynamically modelling the involved dual-hop time-period (TP) metric. An optimization problem is formulated to jointly optimize the throughput, harvested energy, and transmit power of a SWIPT-enabled system with the proposed hybrid scheme. In this regard, we provide two distinct ways to obtain suitable solutions based on the Lagrange dual technique and Dinkelbach method assisted convex programming, respectively, where both the approaches yield an appreciable solution within polynomial computational-time. The experimental results are obtained by directly solving the primal problem using a non-linear optimizer. Our numerical results in terms of weighted utility function show the superior performance of proposed hybrid scheme over passive repeater-only and active relay-only schemes, while also depicting their individual performance benefits over the corresponding benchmark SWIPT systems with the fixed-TP.

Keywords

5G and beyond/6G wireless networks; greencom; IoT; passive repeater; relaying systems; SWIPT

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