Abstract
This paper presents cooperative transmission (CT), where multiple relays are used to achieve array and diversity gains, as an enabling technology for Internet of Things (IoT) networks with hardware-limited devices. We investigate a channel coding aided decode-and-forward (DF) relaying network, considering a two-hop multiple-relay network, where the data transmission between the source and the destination is realized with the help of DF relays. Low density parity check (LDPC) codes are adopted as forward error correction (FEC) codes to encode and decode the data both at the source and relays. We consider both fixed and variable code rates depending upon the quality-of-service (QoS) provisioning such as spectral efficiency and maximum energy efficiency. Furthermore, an optimal power allocation scheme is studied for the cooperative system under the energy efficiency constraint. We present the simulation results of our proposed scheme, compared with conventional methods, which show that if decoupled code rates are used on both hops then a trade-off has to be maintained between system complexity, transmission delay, and bit error rate (BER).
Highlights
The Internet of Things (IoT) is a revolutionary communication paradigm, which enables the seamless integration of an excessive amount of devices with the Internet [1]
We investigate a two-hop network with multiple relays where different power allocation techniques are considered under the constraint of energy efficiency
It is noted that we extend the work in the conference version of this paper [21], where a single relay was assumed, by considering a more general scenario with multiple relays, which is more realistic in IoT networks
Summary
The Internet of Things (IoT) is a revolutionary communication paradigm, which enables the seamless integration of an excessive amount of devices (e.g., sensors, portable devices, cars, and electronic appliances) with the Internet [1]. In [17], the authors considered the optimal power allocation technique under the constraint of union bound minimization They only considered a network with source, destination, and a single relay, where no FEC code was applied at the source or at relay. The authors in [18] considered power allocation and minimization of Chernoff bound on bit error rate (BER) performance, but did not consider FEC codes on transmitting nodes. We investigate a two-hop network with multiple relays where different power allocation techniques are considered under the constraint of energy efficiency. The system under consideration in this paper provides a comprehensive framework for optimal power allocation in a multiple relay network when variable code rates are applied according to the channel conditions.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
