A study on unpredictable shallow water channel behavior by various multipath patterns and experimental data analysis

In shallow water applications, multipath signal propagation is a major concern for robust communication. Multipath signal propagation is not explicitly seen in the channel, even though it is a main contributor for signal degradation. This fact motivated us to simulate multipath patterns to understand its influence in short-range communication. In this paper, a three-path signal propagation model is presented, where, besides the line of sight (LOS) signal, other two non-line of sight (NLOS) signals contact any point of channel boundary to reach the receiver. In simulation, the combination of eight possible multipath patterns is converged to estimate the received signal. A source fixed in water-tank periodically transmits low frequency acoustic signals 1 kHz and 1.5 kHz to the channel, and the receiver records them. The experiment was repeated for various input signal strengths. It has been observed that the simulation results coincide with the measured values. The good reception is noticed for signal frequency 1 kHz at 2.5m and 1.5 kHz at 1.2m. This study identifies the optimal signal strength for better signal reception in short range, which drives to the establishment of high-quality communication in shallow water.

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Investigation of Deterministic, Statistical and Parametric NB-PLC Channel Modeling Techniques for Advanced Metering Infrastructure

Energies ◽

10.3390/en13123098 ◽

2020 ◽

Vol 13 (12) ◽

pp. 3098

Author(s):

Bilal Masood ◽

M. Arif Khan ◽

Sobia Baig ◽

Guobing Song ◽

Ateeq Ur Rehman ◽

...

Keyword(s):

Research Work ◽

Channel Modeling ◽

Signal Propagation ◽

Propagation Model ◽

Advanced Metering Infrastructure ◽

Simulink Model ◽

Modeling Techniques ◽

Multipath Signal ◽

Multipath Signal Propagation ◽

Advanced Metering

This paper is focused on the channel modeling techniques for implementation of narrowband power line communication (NB-PLC) over medium voltage (MV) network for the purpose of advanced metering infrastructure (AMI). Three different types of models, based on deterministic method, statistical method, and network parameters based method are investigated in detail. Transmission line (TL) theory model is used to express the MV network as a two-port network to examine characteristics of sending and receiving NB-PLC signals. Multipath signal propagation model is used to incorporate the effect of multipath signals to determine the NB-PLC transfer function. A Simulink model is proposed which considers the values of MV network to examine the characteristics of NB-PLC signals. Frequency selectivity is also introduced in the impedances to compare variations and characteristics with constant impedances based MV network. A state-of-the-art mechanism for the modeling of capacitive coupling device, and impedances of low voltage (LV) and MV networks is developed. Moreover, a comparative analysis of TL theory and multipath signal propagation models with the proposed Simulink model is presented to validate the performance and accuracy of proposed model. This research work will pave the way to improve the efficiency of next-generation NB-PLC technologies.

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Eliminating the Effects of Multipath Signal Propagation in a Smoothly Inhomogeneous Medium

Radiophysics and Quantum Electronics ◽

10.1007/s11141-013-9444-y ◽

2013 ◽

Vol 56 (7) ◽

pp. 413-421 ◽

Cited By ~ 9

Author(s):

M.V. Tinin ◽

S. I.Knizhin

Keyword(s):

Inhomogeneous Medium ◽

Signal Propagation ◽

Multipath Signal ◽

Multipath Signal Propagation

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INTERFERENCE RESISTANCE OF THE MCWILL SYSTEM

Электросвязь ◽

10.34832/elsv.2021.19.6.005 ◽

2021 ◽

Author(s):

О.А. ШОРИН ◽

Г.О. БОКК

Keyword(s):

Communication System ◽

Radio Channel ◽

Digital Processing ◽

Signal Propagation ◽

Sensitivity Index ◽

Frequency Range ◽

Signal To Noise ◽

Multipath Signal ◽

Multipath Signal Propagation

Рассмотрены проблемы помехоустойчивости алгоритмов цифровой обработки принимаемых сигналов для системы связи МАКВИЛ. Особое внимание уделено вопросам коррекции амплитудно-частотных и фазо-частотных искажений радиоканала в условиях предельно низких отношений сигнал/шум. Произведена оценка потенциальных возможностей улучшения показателя чувствительности при многолучевом распространении сигналов. Выявлены наилучшие алгоритмы. Показано, что для диапазона частот 340 МГц абоненты системы МАКВИЛ, перемещающиеся со скоростями до 6 м/с, при рассмотрении вопроса помехоустойчивости могут восприниматься как стационарные. Problems of interference resistance of algorithms of digital processing of received signals for the McWiLL communication system are considered. Particular attention is paid to the correction of the amplitude-frequency and phase-frequency distortions of the radio channel in conditions of extremely low signal-to-noise ratios. The potential for improving the sensitivity index for multipath signal propagation is assessed. The best algorithms are identified. It is established that for the frequency range of 340 MHz McWiLL system subscribers moving at speeds up to 6 m/s can be perceived as stationary when considering the interference resistance issues.

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