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Title: Cognitive Radio Technology for Improving Capacity of Mobile Communication Systems in Palestine
Authors: Mousa, Anwar
Keywords: Cognitive radio
Improving Capacity
Issue Date: 21-Jan-2014
Publisher: University of Palestine, Majallat Jamiat Filastin lil-Abḥath
Abstract: Radio frequency regulators in the world found that most part of the spectrum was inefficiently utilized ‎[1]. Fixed spectrum assignment prevents rarely used frequencies from being used even when any unlicensed users would not cause noticeable interference to the assigned service. Joseph Mitola ‎[2] proposed the technology of Cognitive Radio (CR), during his PhD thesis in 1998, as a promising technology to balance between spectrum underutilization and spectrum scarcity. CR ‎[3] is a model for wireless communication in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently without interfering with licensed users. A transceiver in CR can intelligently detect which communication channels are in use and which are not, and instantly move into vacant channels while avoiding occupied ones. This optimizes the use of available spectrum bands while minimizing interference to other users. Hence CR has the potential to exploit the inefficiently utilized licensed bands without causing interference to incumbent users. Historically, up until now, the mobile industry has relied on spectrum dedicated for mobile communication and licensed to a certain operator. However, in situations where licensed spectrum is not available, other possibilities for increasing the spectrum availability are of interest. This could include the use of unlicensed spectrum, or secondary spectrum primarily used for other communication services, as a complement to operation in the licensed spectrum. Broadcast spectrum not used in some areas is often referred to as “white space” ‎[4]. The applicability of CR to cellular communication relies on software-defined radio (SDR) ‎[5] and it is a relatively new area where further studies are required to assess the feasibility and impact of such usage. In CR, spectrum sensing locates unused spectrum segments and optimally use these segments without harmful interference to the licensed user. This includes measuring which frequencies are being used, when they are used, estimating the location of transmitters and receivers, and determining signal modulation. Results from sensing the environment would be used to determine radio settings. The main purpose of the research is to evaluate the gain of applying cognitive radio technologies on mobile networks’ capacities and is organized as follows: Section 2 presents main types of cognitive radio and defines spectrum holes for both GSM and UMTS bands based on previous measurements and studies. In section 3, capacity of multiple channels was investigated based on trunking theory where approximated linear equations are derived for the relation between traffic intensity and the number of channels per cell for the different values of grade of services. Section 4 illustrates the expected overall gain of applying cognitive radio technologies on Palestinian mobile networks’ capacities and section 5 concludes the article.
Description: Dr. Anwar M. Mousa University of Palestine-Gaza- Palestine
ISSN: 2410-874X
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