The IEEE802.22 WRAN System Based on Radio Environment Map (REM)

Zhang, Jianwu; Zhao, Qi; Jing-yuan, Zou

doi:10.1109/etcs.2009.31

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…One of the sensing and measuring schemes is the wireless regional area network (WRAN) system based on REM as proposed in [36], which can be looked as an integrated database. REM enabled WRAN system has been proposed in [37] and it has been shown that it can better realize different functions at the same time to ensure the protection of PUs. In case of cognitive access to TV white space scenario, based on CR's geolocation data and specific service requirements, the home base station queries the central database for channel availability [38].…”

Section: Database Techniquementioning

confidence: 99%

Satellite cognitive communications: Interference modeling and techniques selection

Sharma

Chatzinotas

Ottersten

2012

2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (

133

138

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Due to increasing demand of high speed data rate for satellite multimedia and broadcasting services and spectrum scarcity problem in satellite bands, exploring new techniques for enhancing spectral efficiency in satellite communication has become an important research challenge. In this aspect, satellite cognitive communication can be considered as a promising solution to solve spectrum scarcity problem. In this paper, different cognitive techniques such as underlay, overlay, interweave and database related techniques are discussed by reviewing the current state of art. Exact beam patterns of a multi-beam satellite are plotted over the Europe map and interference modeling between terrestrial Base Station (BS) and satellite terminal is carried out on the basis of interference power level. Furthermore, suitable cognitive techniques are proposed in high and low interference regions in the context of satellite cognitive communication.

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Section: Database Techniquementioning

confidence: 99%

Satellite cognitive communications: Interference modeling and techniques selection

Sharma

Chatzinotas

Ottersten

2012

2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (

133

138

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“…In this paper, the CRs are modeled to be distributed in both one dimension (1-D, Section III) and two dimension (2-D, Section IV) according to a Poisson point process and a characteristic function based interference analysis at the WMR is considered. The need for an explicit analysis in 1-D case is emphasized because in a global radio environment map scheme [2], [3], there exists a central entity that contains the GPS coordinates of all the CR devices, collects the details of the primary user operations from each of the CR device and instructs each CR device about its transmission parameters. In a typical highway scenario, the wireless microphone system and the CR devices tend to lie along a line, and the 1-D interference analysis helps the central entity to better decide what the transmission parameters of a CR device needs to be.…”

Section: Introductionmentioning

confidence: 99%

“…These characteristics demand the need for dynamic local spectrum sensing at the CR to detect the presence of transmissions by such primary users. Spectrum sensing schemes based on Radio Environment Map (REM) have been discussed in [2], [3]. Further, the installation of beaconing devices near the WMs have been proposed and discussed in detail in [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Interference from Cooperative Cognitive Radios for Low Power Primary Users

Madhusudhanan¹,

Restrepo²,

Liu³

et al. 2010

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

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Cognitive radios (CR) must ensure that their transmissions do not cause harmful interference to the primary users that operate in the same band. Primary users with short communication range transmitters, such as wireless microphone systems, are considered. The CR network is distributed according to a Poisson process. The CRs detect the primary user either through primary transmitter signals or through beacons collocated with the primary receiver. Three levels of cooperative sensing by CRs are analyzed, namely, no cooperation, full cooperation and partial cooperation. The characteristic function of the interference at the primary receiver for all combinations of primary user detection and cooperative sensing schemes are derived for the system modeled along a line (1-D) and about a plane (2-D). The analysis in 1-D corresponds to a highway scenario and 2-D corresponds to a planar system. The carrier-to-interference ratio (C/I) at the primary receiver is evaluated using the characteristic function. The analysis clearly shows the need for cooperative spectrum sensing when the density of the CRs is high. It is shown that the effect of shadowing, small scale fading, and power control at the CRs can be captured into the density of the CR network. The results hold for the CRs that are wide-band devices as well as narrow-band devices.

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Technical Approaches for Improved Spectrum Sharing

Velez

Matinmikko

2014

Signals and Communication Technology

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The IEEE802.22 WRAN System Based on Radio Environment Map (REM)

Cited by 9 publications

References 5 publications

Satellite cognitive communications: Interference modeling and techniques selection

Satellite cognitive communications: Interference modeling and techniques selection

Modeling of Interference from Cooperative Cognitive Radios for Low Power Primary Users

Technical Approaches for Improved Spectrum Sharing

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