Optimal Packet Length for Free-Space Optical Communications with Average SNR Feedback Channel

Abstract

In this article, a method to enhance data rates of free-space optical (FSO) systems using packet length optimization is proposed. The average signal-to-noise ratio (ASNR) is measured at the receiver and sent back to the transmitter to optimize packet length. In addition, the length of packet is optimized to enhance the average throughput. We concluded that packet length can be reduced at low ASNR. However, packet length should be increased at higher values of received ASNR. For each ASNR, we also choose the optimal modulation and coding scheme (MCS) and optimal packet length to maximize the throughput. Different MCSs are investigated such as 4-pulse amplitude modulation (PAM) with and without channel coding, 8-PAM, 16-PAM, and 32-PAM. The proposed method gives 0.8–1.9 dB gain with respect to conventional FSO with adaptive modulation and coding (AMC) and fixed packet length. This is the first paper to deal with packet length optimization for FSO systems.

A Free Space Optic/Optical Wireless Communication: A Survey

“…At the receiver, the average ASNR was measured and relayed back to the transmitter. For the standard FSO with adaptive modulation and coding (AMC) and constant package length, the suggested technique provided a gain of (0.8-1.9 dB) [45].…”

Sling‐shot spider optimization algorithm based packet length control in wireless sensor network and Internet of Things‐based networks

“…The papers 32,33 34 by Alnwaimi et al proposed a packet length optimization method to enhance the data rate of free-space optical (FSO). They used optimal modulation and coding schemes and the correct packet length to increase the throughput.…”

“…A novel Mixed Integer Programming (MIP) is proposed for the lifetime maximization of WSN by the joint optimization of data packet size and transmission power level. The paper 34 by Alnwaimi et al proposed a packet length optimization method to enhance the data rate of free‐space optical (FSO). They used optimal modulation and coding schemes and the correct packet length to increase the throughput.…”

Free space optics communication system design using iterative optimization

“…Hence, increasing the transmit power has a number of drawbacks. The packet size optimization was also proposed to enhance the data rate of the FSO, [21]. Though optimizing the packet size can guarantee the communication reliability, the overall rate cannot significantly increase because the amount of payload sent when the Signal to Noise Ratio (SNR) is low is lower than the ordinary packet size.…”