Performance analysis and mitigation of turbulence effects using spatial diversity techniques in FSO systems over combined channel

2019 ◽  
pp. 39-70
Author(s):  
Prabu Krishnan
Keyword(s):  
Performance Analysis ◽  
Spatial Diversity ◽  
Diversity Techniques ◽  
Turbulence Effects ◽  
Combined Channel

Performance Analysis of 5G Fixed Wireless Access Networks with Antenna Diversity Techniques

2020 ◽  
Vol 113 (3) ◽  
pp. 1541-1565 ◽  
Author(s):  
Isiaka A. Alimi ◽  
Romilkumar Kantibhai Patel ◽  
Nelson Jesus Muga ◽  
Paulo P. Monteiro
Keyword(s):  
Performance Analysis ◽  
Access Networks ◽  
Wireless Access ◽  
Antenna Diversity ◽  
Wireless Access Networks ◽  
Diversity Techniques ◽  
Fixed Wireless Access ◽  
Fixed Wireless

Bit Error Rate Performance Analysis of Hybrid Subcarrier Intensity Modulation-Based FSO with Spatial Diversity in Various Weather Conditions

2019 ◽  
Vol 40 (3) ◽  
pp. 307-314 ◽  
Author(s):  
Rajat Kumar Giri ◽  
Bijayananda Patnaik
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Weather Conditions ◽  
Spatial Diversity ◽  
Intensity Modulation ◽  
Free Space Optical ◽  
Diversity Techniques ◽  
Link Distance ◽  
Simulation Results ◽  
Improved Performance

Abstract In this paper, we study the performance improvement of free space optical (FSO) communication system with spatial diversity techniques employing hybrid pulse position modulation-binary phase shift keying-subcarrier intensity modulation (PPM-BPSK-SIM). The involvement of multiple photo-detectors in diversity based FSO systems offers an effective way to overcome scntillation. In this paper, we have simulated the bit error rate (BER) with respect to different parameters like average SNR, link distance at various weather conditions. The simulation results are verified in Matlab environment with the mathematical analysis. The simulation results show that higher order single input multiple output (SIMO) system achieves better BER performance and hybrid PPM-BPSK-SIM has significant improved performance than the common modulation schemes like PPM, BPSK-SIM.

Performance Analysis of High Altitude Platform Optical Communication Links with Spatial Diversity

2014 ◽  
Vol 34 (1) ◽  
pp. 0106001 ◽  
Author(s):  
王翔 Wang Xiang ◽  
赵尚弘 Zhao Shanghong ◽  
郑光威 Zheng Guangwei ◽  
李勇军 Li Yongjun ◽  
楚兴春 Chu Xingchun ◽  
...  
Keyword(s):  
Performance Analysis ◽  
High Altitude ◽  
Optical Communication ◽  
Spatial Diversity ◽  
High Altitude Platform ◽  
Communication Links

scholarly journals SPARCO: Stochastic Performance Analysis with Reliability and Cooperation for Underwater Wireless Sensor Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Sheeraz Ahmed ◽  
Nadeem Javaid ◽  
Ashfaq Ahmad ◽  
Imran Ahmed ◽  
Mehr Yahya Durrani ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Sensor Networks ◽  
Performance Analysis ◽  
Routing Protocol ◽  
Spatial Diversity ◽  
Sensor Nodes ◽  
Underwater Sensor Networks ◽  
Energy Efficient Routing ◽  
Cooperative Routing ◽  
Key Factor

Reliability is a key factor for application-oriented Underwater Sensor Networks (UWSNs) which are utilized for gaining certain objectives and a demand always exists for efficient data routing mechanisms. Cooperative routing is a promising technique which utilizes the broadcast feature of wireless medium and forwards data with cooperation using sensor nodes as relays. Here, we present a cooperation-based routing protocol for underwater networks to enhance their performance called Stochastic Performance Analysis with Reliability and Cooperation (SPARCO). Cooperative communication is explored in order to design an energy-efficient routing scheme for UWSNs. Each node of the network is assumed to be consisting of a single omnidirectional antenna and multiple nodes cooperatively forward their transmissions taking advantage of spatial diversity to reduce energy consumption. Both multihop and single-hop schemes are exploited which contribute to lowering of path-losses present in the channels connecting nodes and forwarding of data. Simulations demonstrate that SPARCO protocol functions better regarding end-to-end delay, network lifetime, and energy consumption comparative to noncooperative routing protocol—improved Adaptive Mobility of Courier nodes in Threshold-optimized Depth-based routing (iAMCTD). The performance is also compared with three cooperation-based routing protocols for UWSN: Cognitive Cooperation (Cog-Coop), Cooperative Depth-Based Routing (CoDBR), and Cooperative Partner Node Selection Criteria for Cooperative Routing (Coop Re and dth).

Capacity of Optical Wireless System over Log-Normal Channels with Spatial Diversity in Presence of Atmospheric Losses

2018 ◽  
Vol 39 (3) ◽  
pp. 349-357 ◽  
Author(s):  
Rahul Kaushik ◽  
Vineet Khandelwal ◽  
R.C. Jain
Keyword(s):  
Atmospheric Turbulence ◽  
Channel Capacity ◽  
Random Variable ◽  
Weather Conditions ◽  
Spatial Diversity ◽  
Closed Form Expression ◽  
Atmospheric Conditions ◽  
Optical Wireless ◽  
Diversity Techniques ◽  
Log Normal

Abstract In this paper, average channel capacity of optical wireless communication system is evaluated under the combined effect of geometrical loss, attenuation due to weather conditions and weak atmospheric turbulence using a simple closed form expression. Fading induced due to atmospheric turbulence is modeled by log-normal distribution. Considering the fact that the sum of log-normal random variables can be well approximated by another log-normal random variable, the proposed expression has been utilized to compute the channel capacity for spatial diversity reception employing maximum ratio combining and equal gain combining over uncorrelated turbulence-induced fading conditions. It is shown that spatial diversity is an effective technique to mitigate the impairments caused by various atmospheric conditions such as haze, rain and fog. The quantitative improvement in channel capacity achieved by using diversity techniques is investigated and compared. Accuracy of the results is validated with exact results computed using Monte Carlo simulation.

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