Journal of Aeronautics & Aerospace Engineering
Open Access
ISSN: 2168-9792
ISSN: 2168-9792
Sami Touati
King Saud University, Saudi Arabia
Scientific Tracks Abstracts: J Aeronaut Aerospace Eng
In this paper, we evaluate the throughput of MC-CDMA using RIS. The MC-CDMA transmitter T harvests energy using node B signal. Relay node B decodes the packet and transmit it to the receiver R. MC-CDMA using RIS improves the system performance by 20, 26, 32, 38, 44, 50 dB gain when compared to MC-CDMA systems for a number of reflectors $N=8,16,32,64,128$ and 256. In MC-CDMA systems, the symbols are spread in the frequency domain [1-3]. MC-CDMA can be implemented using dual hop relaying with Decode and Forward (DF) relays [4-6]. The transmitter consists to spread the symbols using a spreading code such as Gold or Kasami sequences. A guard interval is added and the symbol are Serial to Parallel (S/P) converted. Finally, an Inverse Discrete Fourier Transformation (IDFT) is used to generate the MC-CDMA signal. At the receiver, the guard interval is removed then a Discrete Fourier Transformation (DFT) is employed to recover the spread symbol over different sub-carriers. Correlations with the spreading code are used to estimate the transmitted symbols [1-6]. The performance of MC-CDMA systems has been extensively studied in [1-6]. In this paper, we derive the throughput of MC-CDMA systems with energy harvesting. We use RIS in MC-CDMA systems to improve the throughput. The first hop uses conventional MC-CDMA and the second hop uses RIS [7-10]. When RIS is employed, the receiver output is similar to that of a Maximum Ratio Combiner. A hardware implementation of RIS has been discussed in [11-17]. The throughput of hybrid RF optical communications can be improved using RIS. RIS is a good candidate for 6G communications. RIS can be implemented with continuous or discrete phase shifts [18-22]. Machine learning and deep learning algorithms has been suggested to adjust the phases of RIS and to improve the end-to-end throughput [23-24]. MC-CDMA using RIS has not been yet suggested.
Sami Touati is an associate professor in the department of Computer Engineering, College of Computer and Information Sciences, in King Saud University, Saudi Arabia. He Published many research paper in popular journals. He is currently researching on the technology related harvest energy.