A Simulation Study of Nakagami-m Distribution

2015 ◽  
Vol 713-715 ◽  
pp. 1405-1408
Author(s):  
Yi Huai Yang ◽  
Li Fang Wang ◽  
Ming Xiu Shen
Keyword(s):  
Simulation Study ◽  
Mobile Communication ◽  
Fading Channel ◽  
Communication Systems ◽  
Radio Channel ◽  
Channel Modeling ◽  
Mobile Radio ◽  
Test Laboratory ◽  
Radio Communication ◽  
Development Evaluation

Mobile radio channel models are essential for the development, evaluation and test of current mobile radio communication systems and also crucial for the realization of the future systems. Nakagami-m distribution is important for channel modeling in mobile communication. It can repeat system tests in the development, design, or test laboratory. In this study, we make a simulation study of the Nakagami-m distribution. We focus on study the PDF of Nakagami-m distribution under different values ofand, we also simulate the SER Vs.SNR over Nakagami-m fading channel for QPSK

Linear predictor based method for estimating Doppler in mobile radio communication systems

2000 ◽  
Vol 36 (12) ◽  
pp. 1066 ◽  
Author(s):  
C.C. Tsimenidis ◽  
O.R. Hinton ◽  
B.S. Sharif ◽  
A.E. Adams
Keyword(s):  
Communication Systems ◽  
Mobile Radio ◽  
Radio Communication ◽  
Linear Predictor

scholarly journals A New Hybrid Diversity Combining Scheme for Mobile Radio Communication Systems over Nakagami Fading Chanel

2020 ◽  
Vol 12 (3) ◽  
pp. 1-15
Author(s):  
Akinyinka Olukunle Akande ◽  
Onyebuchi Chikezie Nosiri ◽  
Nnaemeka Chiemezie Onuekwusi ◽  
Emmanuel Uchenna Ekwueme
Keyword(s):  
Communication Systems ◽  
Mobile Radio ◽  
Nakagami Fading ◽  
Diversity Combining ◽  
Radio Communication ◽  
Hybrid Diversity

scholarly journals ALGORITHM FOR DETERMINING THE BOUNDARIES OF THE ZONE OF INTERFERENCE OPERATION OF THE RADIO CHANNEL OF THE UHF / VHF RANGE COMMUNICATION IN THE CONDITIONS OF OPERATION OF THE RADIOSHENOPRIAD SOURCE SYSTEM AT DIFFERENT HEIGHTS

2021 ◽  
Vol 1 (37) ◽  
pp. 38-51
Author(s):  
O. Iohov ◽  
◽  
V. Maliuk ◽  
Ye. Kaplun ◽  
◽  
...  
Keyword(s):  
Radio Channel ◽  
Dipole Antenna ◽  
Directional Antennas ◽  
Directional Antenna ◽  
Mobile Radio ◽  
Signal Interference ◽  
Radio Interference ◽  
Radio Communication ◽  
Optimal Orientation ◽  
Reception Area

A method for determining the limits of the maximum size of the stable radio reception area in the UHF / VHF range for mobile radio communication under the conditions of the radio interference system is proposed. The radio is intended to use a directional antenna or screen. Increasing the size of the stable radio reception area is provided by the optimal orientation at each point of the antenna device in azimuth and angle using the model of the radio channel, which allows to calculate the signal / interference ratio taking into account the spatial location of radio interference sources and digital 3D antenna pattern. receiver. The problem of determining the boundaries of the zone of stable radio exchange of mobile radio means using directional antennas in the conditions of real interference is formulated in the form of the problem of finding a single isoline in a scalar field. To determine the coordinates of the points of the map belonging to the isoline, a modification of the wave algorithm is proposed, which is low complexity and unambiguous results. Examples of practical use of the proposed numerical method allow us to conclude that the results are inconsistent with the data obtained in the known works by the analytical method for a particular case. At the same time, the numerical approach used significantly expands the possibilities of calculations by taking into account the location of multiple sources of radio interference at different altitudes, as well as the optimal orientation of the digital 3D - pattern of the antenna device of the signal receiver. The effectiveness of the proposed method is confirmed by increasing the area of the noise-tolerant radio exchange zone by 2.8 times in relation to the option of using a mobile radio with a dipole antenna. For the case of optimal orientation of the directional antenna of the receiver by the azimuth angle, additional optimization by the angle of the place gives a gain of 1.5 times.

scholarly journals Improved Efficiency of Data Transmission in Wireless Communication Systems with Orthogonal Frequency Multiplexing

2021 ◽  
pp. 15-18
Author(s):  
Olga Safonova ◽  
◽  
Elena Arepyeva ◽  
Nadezhda Ermakova ◽  
◽  
...  
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Transmission Rate ◽  
Signal To Noise Ratio ◽  
Radio Channel ◽  
Radio Communication ◽  
Software Model ◽  
Radio Broadcasting ◽  
Mimo Ofdm ◽  
Frequency Multiplexing

The active introduction of Orthogonal Frequency Division Multiplexing (OFDM) technology is now beginning to be widely used in wireless transmission systems, television, radio communication, and radio broadcasting. The efficiency of using a dedicated frequency band at a constant high transmission rate allows you to combat interference arising from the transmission of a useful information on the radio channel. A method of improving quality of information transmission in communication systems with orthogonal frequency multiplexing is described. It is shown that with an increase in the number of receiving and transmitting antennas, the noise immunity increases significantly. An experiment was carried out to change the number of receiving-transmitting antennas and the signal-to-noise ratio, and the dependence of the appearance of an error on the number of transmitting antennas was obtained. The work investigated the software model of MIMO OFDM (modulators and demodulators). As a result of the analysis, the dependence of the appearance of the error frequency on the probability of the error was obtained. This showed that the use of OFDM and MIMO places increased demands on channel estimation.

scholarly journals Analysis of mathematical models of mobility of communication systems of special purpose radio communication systems

2021 ◽  
Vol 4 (2(60)) ◽  
pp. 39-44
Author(s):  
Oleksii Nalapko ◽  
Oleg Sova ◽  
Andrii Shyshatskyi ◽  
Anatolii Hasan ◽  
Vira Velychko ◽  
...  
Keyword(s):  
Wireless Networks ◽  
Mathematical Models ◽  
Communication Systems ◽  
Radio Networks ◽  
Mobile Radio ◽  
Mobility Models ◽  
Radio Communication ◽  
Deterministic Models ◽  
Advantages And Disadvantages ◽  
Individual Nodes

The object of research is the military radio communication system. One of the problems in improving the effectiveness of military radio communication systems is the correct description of the movement process in them. Efficient routing protocols are only possible if reliable information on network topology for network nodes is available. Thus, with this information, packets can be forwarded correctly between the sender and the recipient. Given that the mobility of individual nodes is insignificant in special wireless networks, nodes in the network show the mobility properties of a group of nodes. This observation is directly related to the very existence of military wireless networks with the ability to organize themselves, that is, to support group cooperation and group activities. In this work the problem of analysis (decomposition) of the mobility models of military radio communication networks with the possibility of self-organization is solved. The classification of mobility patterns, the description of individual mobility models and the analysis of various aspects currently available, as well as those properties lacking in the attempt to simulate the movement of individual nodes, have been carried out. During the research, the analysis of random, semi-deterministic and deterministic models was carried out. The advantages and disadvantages of the above models have been identified. In the course of the research, the authors of the work used the main principles of the theory of mass service, the theory of automation, the theory of complex technical systems, as well as general scientific methods of knowledge, namely analysis and synthesis. The research results will be useful in: ‒ synthesis of mathematical models of node mobility; ‒ evaluation of the effectiveness of the science-based tool for assessing the mobility of nodes; ‒ validation of recommendations to improve the efficiency of mobile radio networks; ‒ analysis of the radio-electronic situation during the conduct of military operations (operations); ‒ creating advanced technologies to improve the efficiency of mobile radio networks.

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