scholarly journals End-to-end performance of DF multihop hybrid RF/FSO system using MPPM coding and MIMO technique under dependent GG turbulence channels

2020 ◽  
Vol 19 (2) ◽  
pp. 811
Author(s):  
Hechmi Saidi ◽  
Noureddine Hamdi
Keyword(s):  
Multiple Input Multiple Output ◽  
Error Rates ◽  
Free Space Optics ◽  
Pulse Position Modulation ◽  
Space Optics ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Interesting Approach ◽  
Closed Form Formula

<p><span>The paper presents a BER analysis for hybrid Radio Frequency/multihop Free Space Optics, known as RF/FSO, communication system benefiting from Multiple Input Multiple Output (MIMO) configuration but impaired by Gamma-Gamma, known as GG, turbulence. Authors deploy Multiple Pulse Position Modulation, known as M-PPM, like a signaling technique. Furthermore, the exact as well as approximated amounts of Symbol-Error Rates, known as SERs, are both judged in this work. A closed form formula related to the whole Probability Density Function, called PDF, for our designed system is derived. Such interesting approach provides to us better quality of service by combating atmospheric turbulence.</span></p>

Analyzing of UVLC system considering the effect of water depth

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mustafa B. Al-Deen ◽  
Mazin Ali A. Ali ◽  
Zeyad A. Saleh
Keyword(s):  
Coastal Water ◽  
Water Depth ◽  
Bit Error Rate ◽  
Multiple Input Multiple Output ◽  
Visible Light Communications ◽  
New Approach ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Depth Water

Abstract This paper presents a new approach to discover the effect of depth water for underwater visible light communications (UVLC). The quality of the optical link was investigated with varying water depth under coastal water types. The performance of the UVLC with multiple input–multiple output (MIMO) techniques was examined in terms of bit error rate (BER) and data rate. The theoretical result explains that there is a good performance for UVLC system under coastal water.

scholarly journals A Multiple-Input Multiple-Output Reservoir Computing System Subject to Optoelectronic Feedbacks and Mutual Coupling

Entropy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 231 ◽  
Author(s):  
Xiurong Bao ◽  
Qingchun Zhao ◽  
Hongxi Yin
Keyword(s):  
Mutual Coupling ◽  
Signal To Noise Ratio ◽  
Multiple Input Multiple Output ◽  
Computing System ◽  
Error Rates ◽  
Reservoir Computing ◽  
Multiple Input ◽  
Input Multiple Output ◽  
High Recognition Accuracy ◽  
Mean Square Errors

In this paper, a multiple-input multiple-output reservoir computing (RC) system is proposed, which is composed of multiple nonlinear nodes (Mach–Zehnder modulators) and multiple mutual-coupling loops of optoelectronic delay lines. Each input signal is added into every mutual-coupling loop to implement the simultaneous recognition of multiple route signals, which results in the signal processing speed improving and the number of routes increasing. As an example, the four-route input and four-route output RC is simultaneously realized by numerical simulations. The results show that this type of RC system can successfully recognize the four-route optical packet headers with 3-bit, 8-bit, 16-bit, and 32-bit, and four-route independent digital speeches. When the white noise is added to the signals such that the signal-to-noise ratio (SNR) of the optical packet headers and the digital speeches are 35 dB and 20 dB respectively, the normalized root mean square errors (NRMSEs) of the signal recognition are all close to 0.1. The word error rates (WERs) of the optical packet header recognition are 0%. The WER of the digital speech recognition is 1.6%. The eight-route input and eight-route output RC is also numerically simulated. The recognition of the eight-route 3-bit optical packet headers is implemented. The parallel processing of multiple-route signals and the high recognition accuracy are implemented by this proposed system.

Bit Error Rate of Atmospheric Optical Multiple Input Multiple Output System with Pulse Position Modulation Under Influence of Combined Effect

2019 ◽  
Vol 56 (9) ◽  
pp. 090602
Author(s):  
张悦 Zhang Yue ◽  
王惠琴 Wang Huiqin ◽  
曹明华 Cao Minghua ◽  
雷景丽 Lei Jingli ◽  
王道斌 Wang Daobin
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Multiple Input Multiple Output ◽  
Combined Effect ◽  
Pulse Position Modulation ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Output System

scholarly journals The Analysis of Mobile WiMAX and LTE using MIMO technique

2013 ◽  
Vol 5 (1) ◽  
pp. 35-40
Author(s):  
Roopali Garg ◽  
Shafi Singla
Keyword(s):  
Channel Coding ◽  
Multiple Input Multiple Output ◽  
Spatial Multiplexing ◽  
Mobile Wimax ◽  
Ieee 802.16E ◽  
File Transfer ◽  
Network Resources ◽  
Multiple Input ◽  
Input Multiple Output

A quality of service is a fundamental component of the 4G broadband network for satisfactory service delivery by evolving internet application to end user, and managing the network resources. The 4G technology has emerged one of the most fruitful technologies as it supports large number of applications including VOIP, video conferencing, file transfer, video streaming and web browsing. IEEE 802.16E, IEEE 802.16M and LTE along with various application and QoS requirement also support Multiple-Input-multiple-output (MIMO) techniques including Spatial Multiplexing (SM), Space Time Block Coding(STBC) and Eigen Beam-forming (BM).In the paper we will study Physical, MAC layer of WiMAX and LTE. We will also study MIMO techniques. In this paper  the detailed study of the throughput for a MIMO mobile WiMAX system and LTE  under two different PHY PER QoS threshold. Various modulation and channel coding techniques have been applied.

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