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Open AccessArticle

Energy Efficiency of a Decode-and-Forward Multiple-Relay Network with Rate Adaptive LDPC Codes

1
Department of Telecommunications, University of Stuttgart, 70569 Stuttgart, Germany
2
School of Electrical Engineering & Computer Science (SEECS), National University of Sciences & Technology (NUST), Islamabad 44000, Pakistan
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Department of Information & Telecommunication Engineering, Incheon National University, Incheon 22012, Korea
*
Author to whom correspondence should be addressed.
This paper is an extension version of the conference paper: Chaoudhry, B.B.; Hassan, S.A.; Speidel, J. Performance Analysis of LDPC-Based Rate Adaptive Relays over Nakagami Channels. In Proceedings of the 2018 IEEE 88th Vehicular Technology Conference: VTC2018-Fall, Chicago, IL, USA, 27–30 August 2018.
Sensors 2019, 19(21), 4793; https://doi.org/10.3390/s19214793
Received: 23 September 2019 / Revised: 1 November 2019 / Accepted: 1 November 2019 / Published: 4 November 2019
(This article belongs to the Special Issue Recent Advances in Internet of Things and Sensor Networks)
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). View Full-Text
Keywords: cooperative links; decode-and-forward; energy efficiency; energy harvesting; LDPC codes; power allocation; regenerative relaying cooperative links; decode-and-forward; energy efficiency; energy harvesting; LDPC codes; power allocation; regenerative relaying
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Chaoudhry, B.B.; Hassan, S.A.; Speidel, J.; Jung, H. Energy Efficiency of a Decode-and-Forward Multiple-Relay Network with Rate Adaptive LDPC Codes. Sensors 2019, 19, 4793.

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