Title: Optimal harvesting duration for CDMA systems

Authors: Sami Touati; Rachid Sammouda; Musaed A. Alhussein

Addresses: Sat. Tech Co., 5 Parc Talbot, 78130 Les Mureaux, France ' Computer Engineering Department, College of Computer and Information Sciences, King Saud University, Riyadh, Saudi Arabia ' Computer Engineering Department, College of Computer and Information Sciences, King Saud University, Riyadh, Saudi Arabia

Abstract: This paper studies the throughput of code division multiple access (CDMA) systems with energy harvesting using the received radio frequency (RF) signal at the transmitter. A CDMA transmitter T harvests energy using the received signals from node N. Then, the harvested energy is used to transmit data to a CDMA receiver R. We derive the throughput at the receiver as well as the cumulative distribution function (CDF) of signal to noise ratio (SNR). We also suggest to optimise harvesting duration to maximise the throughput. The proposed optimal harvesting duration allows to double the throughput at high SNR with respect to a network where harvesting and data transmission phases have the same durations. CDMA systems with energy harvesting do not require to recharge or change the battery of transmitter T. Our results are valid for any number of paths between N and T and any number of paths between T and R.

Keywords: code division multiple access; CDMA; energy harvesting; multipath channels; throughput analysis.

DOI: 10.1504/IJAHUC.2021.119848

International Journal of Ad Hoc and Ubiquitous Computing, 2021 Vol.38 No.4, pp.213 - 218

Received: 27 Jul 2020
Accepted: 11 Mar 2021
Published online: 22 Dec 2021 *

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