A software defined radio structure for 2nd and 3rd generation mobile communications standards

2002 ◽  
Author(s):  
F. Jondral ◽  
A. Wiesler ◽  
R. Machauer
Keyword(s):  
Mobile Communications ◽  
Software Defined Radio ◽  
Radio Structure ◽  
Communications Standards

scholarly journals Learning Mobile Communications Standards through Flexible Software Defined Radio Base Stations

2017 ◽  
Vol 55 (5) ◽  
pp. 116-123 ◽  
Author(s):  
Victor P. Gil Jimenez ◽  
Alejandro Lancho Serrano ◽  
Borja Genoves Guzman ◽  
Ana Garcia Armada
Keyword(s):  
Mobile Communications ◽  
Software Defined Radio ◽  
Base Stations ◽  
Communications Standards

scholarly journals IN SEARCH OF SUSTAINABLE BUSINESS MODELS FOR COGNITIVE RADIO EVOLUTION

2012 ◽  
Vol 18 (2) ◽  
pp. 230-247 ◽  
Author(s):  
Vladislav V. Fomin ◽  
Artūras Medeišis ◽  
Daiva Vitkutė-Adžgauskienė
Keyword(s):  
Cognitive Radio ◽  
Mobile Communications ◽  
Software Defined Radio ◽  
Business Models ◽  
Spectrum Access ◽  
New Paradigm ◽  
Sustainable Business ◽  
Radio Communications ◽  
Telecommunications Infrastructure ◽  
Radio Frequency Spectrum

In this paper we examine the emerging industry of Cognitive Radio/Software Defined Radio (CR/SDR), a sector which in some ways seconds the industry structure of the cellular mobile communications, while bearing distinctive characteristics. Any radio telecommunications infrastructure depends on scarce resources – radio frequency spectrum – that require policy decisions for allocation to specific countries and services. CR/SDR may constitute a new paradigm in radio communications as it may completely or partially eliminate the role of the regulator in minutiae of spectrum access authorization. In this paper, we review scarce literature on CR/SDR to analyze the relationships between political, technological and economic factors in order to identify drivers and barriers to the emergence of new techno-economic paradigm of CR/SDR. Our discussion of business opportunities for CR/SDR includes analysis of applicable spectrum access policies and identification of those of them, which would be most fertile for the development of future CR/SDR business.

scholarly journals HF Noise Measurement in the Western Part of Romania

2019 ◽  
Vol 25 (3) ◽  
pp. 7-12
Author(s):  
Cornel Balint ◽  
Aldo de Sabata
Keyword(s):  
Frequency Band ◽  
Mobile Communications ◽  
Noise Level ◽  
Software Defined Radio ◽  
Time Interval ◽  
Signal Acquisition ◽  
Mean Power ◽  
Band Size ◽  
Noise Measurements ◽  
Point To Point

Abstract Despite the extraordinary development of mobile communications, HF radio links have several advantages that make them unique in some application areas. Knowledge of HF noise is critical for the setup of a point to point HF communication. The paper presents HF noise measurements performed using a broadband antenna and Software Defined Radio equipment for signal acquisition, followed by offline signal processing. The recording has been split into several sub-bands of small bandwidth and for each sub-band the mean power has been computed, to find the sub-band with the lowest power. It might be assumed that the frequency band having the lowest power contains only noise. An analysis of the influence of sub-band size on the noise level hasalso been made. Measurements cover a large part of HF band and a large time interval to observe the noise behaviour.The paper analyses the noise level over short and long time periods, and over a large frequency band, and reports also simultaneous noise measurements in two locations in the western part of Romania, a dense urban one and a small town one, to highlight the differences caused by man-made noise of industrial type.

scholarly journals Multicarrier systems and filter banks

2006 ◽  
Vol 4 ◽  
pp. 165-169 ◽  
Author(s):  
D. S. Waldhauser ◽  
J. A. Nossek
Keyword(s):  
Mobile Communications ◽  
Orthogonal Frequency Division Multiplex ◽  
Filter Bank ◽  
Low Complexity ◽  
Cyclic Prefix ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Multicarrier Systems ◽  
Guard Interval ◽  
Communications Standards

Abstract. Multicarrier systems, especially orthogonal frequency division multiplex (OFDM), are already established in a lot of current communications standards. Moreover, they are very prominent candidates for future systems in mobile communications. Filter bank based multicarrier systems can be designed to provide a better spectral shaping than OFDM systems. That way, they have some advantages against OFDM, which will be shown in this work and motivate further research in the direction of channel equalizers with low complexity. This leads to optimum bandwidth efficient multicarrier systems without guard interval, i.e. cyclic prefix.

Mobile communications in hospitals

Anaesthesia ◽  
2000 ◽  
Vol 55 (7) ◽  
pp. 727-728 ◽  
Author(s):  
J. A. Lack
Keyword(s):  
Mobile Communications

GPS and GSM Based Tracking System for Objects Moving over Wide Geographical Areas

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Fatima Ameen ◽  
Ziad Mohammed ◽  
Abdulrahman Siddiq
Keyword(s):  
Global Positioning System ◽  
Mobile Communications ◽  
Moving Objects ◽  
Tracking System ◽  
Geographical Area ◽  
Tracking Systems ◽  
Acceptable Result ◽  
Internet Service ◽  
Global Positioning ◽  
Tracking Objects

Tracking systems of moving objects provide a useful means to better control, manage and secure them. Tracking systems are used in different scales of applications such as indoors, outdoors and even used to track vehicles, ships and air planes moving over the globe. This paper presents the design and implementation of a system for tracking objects moving over a wide geographical area. The system depends on the Global Positioning System (GPS) and Global System for Mobile Communications (GSM) technologies without requiring the Internet service. The implemented system uses the freely available GPS service to determine the position of the moving objects. The tests of the implemented system in different regions and conditions show that the maximum uncertainty in the obtained positions is a circle with radius of about 16 m, which is an acceptable result for tracking the movement of objects in wide and open environments.

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