The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Spectrum divide is a consequence of the current spectrum management framework which is locked into a paradigm that is based on assigning spectrum exclusively to a number of operators. This regulatory gridlock is due to resistance from current institutional framework, decision making political economy, and misconception of commons. Industrial, Scientific and Medical (ISM) applications, International...
This paper looks at regulation for enhanced forms of carrier aggregation. The first objective of the paper is to provide a vision for carrier aggregation that goes beyond LTE-Advanced. Carrier aggregation as currently defined is envisaged as the aggregation of blocks from spectrum resources which are statically assigned to a mobile network operator. In the enhanced vision dynamic assignments, shared...
The TV whitespaces represent an incredible opportunity for innovation. Along with this opportunity come significant challenges: the whitespaces are very heterogeneous in terms of channel availability as well as quality. This poses a challenge to anyone wishing to achieve uniform or even similar quality of service nationwide. In this paper, we consider using heterogeneity in the emissions limits to...
We introduce the concept of “pluralistic licensing”, which we describe as the award of licenses under the assumption that opportunistic secondary spectrum access will be allowed, and that interference may be caused to the primary with parameters and rules that are known to the primary at the point of obtaining the license. A key aspect of the concept is that the primary will choose from a range of...
We have implemented a non-iterative multitaper sensing hardware core. The multitaper core computes the spectrum as the average of M eigenspectra calculated using Slepian sequences. While more computationally complex than traditional Fourier methods, the multitaper estimation method offers enhanced performance. The working multitaper hardware core was validated on FPGA using over the air RF measurements...
Enabling flexible spectrum access (FSA) in existing wireless networks is challenging due to the limited spectrum programmability - the ability to change spectrum properties of a signal to match an arbitrary frequency allocation. This paper argues that spectrum programmability can be separated from general wireless physical layer (PHY) modulation. Therefore, we can support flexible spectrum programmability...
CSERE (Cognitive System Enabling Radio Evolution) is a high performance modular cognitive engine written in Python which can control a wide variety of radio platforms to implement fully functional cognitive radios. Its modular architecture allows CSERE to hot swap software components like objective analyzers (objective function calculators), rankers, and environmental sensors, based on the evolving...
In cognitive radio systems, the available frequency bands are usually non-contiguous, which may cause impact on the spectrum utilization efficiency (SUE).When the receiver has a limited sampling capability, the aliasing phenomenon may cause interference among the signals at different frequency points, thus causing the loss of channel capacity. Information theoretic analysis is carried out to quantify...
This paper explores the possibilities of how the value system around wireless networks could be organized in the future and what would be the underlying market dynamics given the introduction of Cognitive Radio and Dynamic Spectrum Access technologies. Using a combination of systems thinking tools and platform theory four value system configurations around the future radio platform are introduced...
Market based spectrum allocation should be competitive and economically efficient to effectively use the spectrum. Yet infrastructure markets have a tendency to become natural monopolies or oligopoly due to the high fixed costs and inherent economies of scale. Instruments such as set-asides, bidding credits, spectrum caps, band plan and auction designs are some of the market-based solutions that can...
The demand for spectrum is growing rapidly as data intensive mobile communications and high-definition television are getting more popular. The spectrum regulators are preparing for flexible spectrum use and the implementation of new technologies. To make the appropriate decisions, the regulators need to identify and evaluate the different alternatives. In this paper, we examine a systematic classification...
This paper presents results of a study about the statistical properties of noise (including unknown interference) in blank channels of TV bands, i.e., TV white spaces. Measurements were conducted to collect data in three different scenarios: sunny-day laboratory, sunny-day curbside and rainy-day laboratory. Impulsive noise has been modeled as a pulse train and the pulse amplitude, pulse duration time...
In 2007, the Wireless Network and Communications (WiNCom) Research Center at the Illinois Institute of Technology initiated a continuous RF spectrum measurement program in the frequency range 30 MHz to 6 GHz. The data measurement collection, now multiple Terabytes, was historically stored in a flat file format on multiple hard drives which was efficient and easy to deal with from a data collection...
In this paper, we present digital dividend (DD) spectrum capacity gain brought about by switching from analogue terrestrial television (ATT) to digital terrestrial television (DTT) which is now ongoing in China. DD spectrum represents total of TVWhite Space (TVWS) and the released spectrum in our paper. Since spectrum measurement is the most effective method to evaluate the capacity, we use measured...
In this paper we investigate the usage of cognitive radio devices within the service area of TV broadcast stations. Until now the main approach for a cognitive radio to operate in the TV bands has been to register TV broadcast stations locations and thus protecting the broadcast stations service area. Through information about TV receivers' location, we show that a cognitive radio should be able to...
Most research assume a clean slate approach towards the emergence of secondary spectrum markets. Additionally markets are typically designed with an underlying assumption of participating actors being homogeneous (i.e. using similar wireless architecture). In contrast with above we take an evolutionary approach when designing our market mechanism towards heterogeneous secondary usage of the radio...
In this paper we present results from a week long measurement campaign on spectrum use in London (UK). The measurements were conducted in order to understand the characteristics and especially the variability in spectrum use over different types of areas in a major metropolitan area. Three spectrum analyzers were used in the measurement campaign, one used for long-term measurements at a single location...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.