Transmit Power Minimization in Bidirectional Tag-to-Device Communications for IoT | IEEE Conference Publication | IEEE Xplore

Transmit Power Minimization in Bidirectional Tag-to-Device Communications for IoT


Abstract:

This paper explores a bidirectional communication scenario between a backscatter tag and an energy harvesting user in the presence of a multi-antenna energy transmitter. ...Show More

Abstract:

This paper explores a bidirectional communication scenario between a backscatter tag and an energy harvesting user in the presence of a multi-antenna energy transmitter. This hybrid user scenario provides the flexibility of optimizing our performance metric as the two techniques complement each other in achieving the desired objective. We measure the performance of the system in terms of the transmit power with an aim of minimizing it. This objective is achieved by solving a minimization problem over a joint set of constraints in energy transmit time, transmit power of the energy source, and a beamforming vector. Further, we analyze a special case where the source node is equipped with only a single antenna and leverage its analysis to achieve our overall aim, that is, the generalized case with a multi-antenna source node. Finally, the numerical results demonstrate a consensus with the analysis carried out for both the aforementioned cases.
Date of Conference: 05-09 January 2021
Date Added to IEEE Xplore: 17 February 2021
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Conference Location: Bangalore, India

I. Introduction and Background

The advent of Internet of Things (IoT) has led to a tremendous increase in the number of smart devices. These smart devices can sense the state of a desired parameter to perform a particular task such as, communicating with other devices, transferring its information to a suitable sink, assisting their allies in establishing a communication environment, etc. One of the intrinsic part of IoT is to facilitate the communication between smart devices present in the proximity of each other. This direct connection between the devices, without the involvement of any base stations, has laid the foundation of an established, but still, an emerging area of communication between devices. This, in context of wireless powered communication network (WPCN), is referred to as device to device (D2D) communications. Although, the D2D communications finds its origin in the context of exchanging information locally for achieving higher data rates [1] and minimum power consumption, but, owing to the ubiquitous connectivity of IoT networks, the area gains more importance and can be exploited for wider range of applications, especially, in smart home automation [2]. In this work, we present a specific scenario of D2D communications by studying the interaction of two different types of users such that they are equipped with two different technologies, namely, energy harvesting and backscattering, respectively. This makes our system model significant from the practical perspective. This is because both the technologies namely, energy harvesting (EH) using radio frequency (R) signals [3] and backscatter communications [4], [5], can offer many benefits such as low power consumption, transferring information wirelessly either independently or cooperatively [6], etc., which can contribute significantly in expediting the area of IoT.

References

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