PAth loss and matched filter gain of free space and ground reflection channels for UWB radio systems

2005 ◽  
Author(s):  
S. Promvong ◽  
J. Takada ◽  
P. Supanakoon ◽  
P. Tangtisanon
Keyword(s):  
Free Space ◽  
Matched Filter ◽  
Path Loss ◽  
Radio Systems ◽  
Uwb Radio

scholarly journals Influence of Noise-Limited Censored Path Loss on Model Fitting and Path Loss-Based Positioning

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 987
Author(s):  
Aki Karttunen ◽  
Mikko Valkama ◽  
Jukka Talvitie
Keyword(s):  
Model Fitting ◽  
Path Loss ◽  
Threshold Level ◽  
Training Data ◽  
Link Distance ◽  
Strength Based ◽  
Radio Systems ◽  
Two Phases ◽  
Wireless Standards ◽  
Influence Of Noise

Positioning is considered one of the key features in various novel industry verticals in future radio systems. Since path loss (PL) or received signal strength-based measurements are widely available in the majority of wireless standards, PL-based positioning has an important role among positioning technologies. Conventionally, PL-based positioning has two phases—fitting a PL model to training data and positioning based on the link distance estimates. However, in both phases, the maximum measurable PL is limited by measurement noise. Such immeasurable samples are called censored PL data and such noisy data are commonly neglected in both the model fitting and in the positioning phase. In the case of censored PL, the loss is known to be above a known threshold level and that information can be used in model fitting and in the positioning phase. In this paper, we examine and propose how to use censored PL data in PL model-based positioning. Additionally, we demonstrate with several simulations the potential of the proposed approach for considerable improvements in positioning accuracy (23–57%) and improved robustness against PL model fitting errors.

Spatial Opportunity for Cognitive Radio Systems with Heterogeneous Path Loss Conditions

2007 ◽  
Author(s):  
Kentaro Nishimori ◽  
Rocco Di Taranto ◽  
Hiroyuki Yomo ◽  
Petar Popovski ◽  
Yasushi Takatori ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Path Loss ◽  
Cognitive Radio Systems ◽  
Radio Systems

scholarly journals Outdoor Radio Propagation Model Optimization Using Genetic Algorithm

2021 ◽  
Author(s):  
Deepti Kakkar ◽  
Amarah Zahra ◽  
Hritwik Todawat ◽  
Vaishnawi Singh ◽  
Farhana Shahid ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Free Space ◽  
Path Loss ◽  
Propagation Model ◽  
Wireless System ◽  
Propagation Models ◽  
Ga Algorithm ◽  
Optimum Path ◽  
Long Time ◽  
Radio Propagation Model

Path loss which is one of the main issues in wireless communication system and has been studied for long time. With the tremendous increase in demand in wireless technology, this Path loss needs to be optimized. Therefore, it is very important to analyse these different propagation models in order to get some useful information out and develop a system based on it. This is done to get the optimum path loss from different models. These are useful tools which makes the designers capable of designing a wireless system with great efficiency. In pursuit of the same, this paper attempts to optimize free space propagation model and hata model using GA algorithm, and shows a comparison by putting them side by side. This paper gives an insight of comparison between free space and Hata model in wireless communication taking different propagation environments into consideration.

scholarly journals Performance analysis of patch antenna for underwater wireless communication in seawater

2021 ◽  
Vol 22 (2) ◽  
pp. 857
Author(s):  
Siti Harliza Mohd Razali ◽  
Razali Ngah ◽  
Yoshihide Yamada ◽  
Kamilia Kamardin
Keyword(s):  
Wireless Communication ◽  
Patch Antenna ◽  
Free Space ◽  
Path Loss ◽  
Simulation Software ◽  
Rectangular Patch ◽  
Seawater Environment ◽  
The Difference ◽  
The One ◽  
Underwater Wireless Communication

<span lang="EN-US">Underwater wireless communication in seawater is becoming more interesting and challenging in recent years. The development of antenna for underwater wireless communication in seawater at 900 MHz UHF range frequency is implemented by using patch antenna. In this paper, the antennas were designed using FEKO, an electromagnetic simulation software, and a suitable size for rectangular patch antenna for seawater application was developed to study the relevance between λ0 with W and L in seawater. The difference between the patches in free space and seawater was the L size, which was slightly bigger, about 0.9 mm, than free space size. But the gain for patch antenna in seawater was found at -2.51 dBi, lower than patch antenna in free space, which was 5.76 dBi due to the path loss in seawater. This shows that attenuation happened, and a better antenna will be design. The one that has better gain, which is around above 2 dBi in seawater, in order to get better performance antenna in seawater environment.</span>

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