Passive beam forming and spatial diversity in meteor scatter communication systems

Radio Science ◽  
1996 ◽  
Vol 31 (2) ◽  
pp. 367-380 ◽  
Author(s):  
Ammad Akram ◽  
Paul S. Cannon
Keyword(s):  
Communication Systems ◽  
Spatial Diversity ◽  
Beam Forming ◽  
Meteor Scatter

scholarly journals Path-Loss Channel Models for Receiver Spatial Diversity Systems at 2.4 GHz

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Abdulmalik Alwarafy ◽  
Ahmed Iyanda Sulyman ◽  
Abdulhameed Alsanie ◽  
Saleh A. Alshebeili ◽  
Hatim M. Behairy
Keyword(s):  
Communication Systems ◽  
Path Loss ◽  
Spatial Diversity ◽  
Propagation Path ◽  
Real Field ◽  
Channel Models ◽  
Power Combining ◽  
Receiving Antenna ◽  
Diversity Systems ◽  
Loss Models

This article proposes receiver spatial diversity propagation path-loss channel models based on real-field measurement campaigns that were conducted in a line-of-site (LOS) and non-LOS (NLOS) indoor laboratory environment at 2.4 GHz. We apply equal gain power combining (EGC), coherent and noncoherent techniques, on the received signal powers. Our empirical data is used to propose spatial diversity propagation path-loss channel models using the log-distance and the floating intercept path-loss models. The proposed models indicate logarithmic-like reduction in the path-loss values as the number of diversity antennas increases. In the proposed spatial diversity empirical path-loss models, the number of diversity antenna elements is directly accounted for, and it is shown that they can accurately estimate the path-loss for any generalized number of receiving antenna elements for a given measurement setup. In particular, the floating intercept-based diversity path-loss model is vital to the 3GPP and WINNER II standards since they are widely utilized in multi-antenna-based communication systems.

Satellite-to-Ground FSO System Based on Multiaperture Receivers as an Optimization Solution for Strong Turbulence and Fog Conditions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hilal A. Fadhil
Keyword(s):  
Communication Systems ◽  
Optical Power ◽  
Spatial Diversity ◽  
Climatic Conditions ◽  
Free Space Optics ◽  
Focal Points ◽  
Maximum Throughput ◽  
Space Optics ◽  
Coherent Receivers ◽  
Key Driver

AbstractSatellite-to-Ground Downlink-Free Space Optics (SatGD-FSO) communication systems are emerging as the key driver for telecom investment, with several factors driving this convergence. It is attractive to minimize the size, weight, and power profiles of the space terminals by utilizing high affectability and huge accumulation collection zone ground terminals. Multiaperture coherent receivers using spatial diversity approached is considered on the attractive solution can fulfill this necessity and have numerous focal points over the single enormous opening cognizant recipients. The effects of atmospheric and climatic conditions using various dynamic system parameters have been investigated as a function of bit-error-rate (BER) performance of multiaperture coherent receivers. Types of orbits, aperture averaging, zenith angle, transmit optical power, and modulation schemes are systematically investigated and compared to the SatGD communication system. The proposed solution with a maximum throughput of 2.5 Gbps is useful for a plan and optimization improvement of the SatGD-FSO systems.

Performance of free-space optical communication systems using circle polarization shift keying with spatial diversity receivers

2013 ◽  
Vol 11 (s2) ◽  
pp. S20101-320104 ◽  
Author(s):  
Chao Liu Chao Liu ◽  
Yong Yao Yong Yao ◽  
Yanfu Yang Yanfu Yang ◽  
Yijun Yuan Yijun Yuan ◽  
Yufeng Zhao Yufeng Zhao ◽  
...  
Keyword(s):  
Optical Communication ◽  
Free Space ◽  
Communication Systems ◽  
Spatial Diversity ◽  
Free Space Optical Communication ◽  
Free Space Optical ◽  
Optical Communication Systems ◽  
Shift Keying ◽  
Space Optical Communication

BER of Underwater Wireless Optical Communication Systems with SIMO Detection over Strong Oceanic Turbulence

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Yuqing Fu
Keyword(s):  
Optical Communication ◽  
System Performance ◽  
Communication Systems ◽  
Spherical Wave ◽  
Random Variable ◽  
Spatial Diversity ◽  
Link Length ◽  
Single Input Single Output ◽  
Wireless Optical Communication ◽  
Single Input

AbstractA spherical wave propagates through the strong underwater turbulence media is modeled as gamma–gamma random variable in the underwater wireless optical communication (UWOC) systems. To mitigate turbulence-induced fading, spatial diversity over UWOC links is proposed. Furthermore, the exact bit error rate (BER) expressions for both single-input single-output (SISO) and single-input multiple-output (SIMO) UWOC systems with optimal combining based on on–off keying (OOK) modulation are analytically derived. Then the system performance is simulated with various variations of the underwater turbulence, i.e. the rate of dissipation of kinetic energy per unit mass of fluid, the ratio of temperature to salinity contributions to the refractive index spectrum, and the UWOC system link length. The results show that the analytical expressions for describing the system performance are valid and spatial diversity can considerably improve the system performance.

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