Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936202
J. Laska, W. F. Bradley, T. Rondeau, K. Nolan, B. Vigoda
We explore the practical costs and benefits of CS for dynamic spectrum access (DSA) networks. Firstly, we review several fast and practical techniques for energy detection without full reconstruction and provide theoretical guarantees. We also define practical metrics to measure the performance of these techniques. Secondly, we perform comprehensive experiments comparing the techniques on real signals captured over the air. Our results show that we can significantly compressively acquire the signal while still accurately determining spectral occupancy.
{"title":"Compressive sensing for dynamic spectrum access networks: Techniques and tradeoffs","authors":"J. Laska, W. F. Bradley, T. Rondeau, K. Nolan, B. Vigoda","doi":"10.1109/DYSPAN.2011.5936202","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936202","url":null,"abstract":"We explore the practical costs and benefits of CS for dynamic spectrum access (DSA) networks. Firstly, we review several fast and practical techniques for energy detection without full reconstruction and provide theoretical guarantees. We also define practical metrics to measure the performance of these techniques. Secondly, we perform comprehensive experiments comparing the techniques on real signals captured over the air. Our results show that we can significantly compressively acquire the signal while still accurately determining spectral occupancy.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115134434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936266
V. Atanasovski, J. van de Beek, A. Dejonghe, D. Denkovski, L. Gavrilovska, Sebastien Grimoud, P. Mahonen, Mihajlo Pavloski, V. Rakovic, J. Riihijarvi, B. Sayraç
In this demonstration proposal we describe a prototype of a radio environment map (REM) for storing and reasoning about spectrum data obtained from heterogeneous sources. The architecture of the REM prototype is both modular and extendible, and can be used with very diverse spectrum sensors, ranging from high-fidelity spectrum analyzers to dedicated low-cost embedded solutions. In the proposed demonstration we will illustrate how information such as transmitter locations and estimates of spectrum occupancy over space and time can be inferred and made available through the REM, based on information obtained from a network of different spectrum sensors deployed specifically for the demonstration.
{"title":"Constructing radio environment maps with heterogeneous spectrum sensors","authors":"V. Atanasovski, J. van de Beek, A. Dejonghe, D. Denkovski, L. Gavrilovska, Sebastien Grimoud, P. Mahonen, Mihajlo Pavloski, V. Rakovic, J. Riihijarvi, B. Sayraç","doi":"10.1109/DYSPAN.2011.5936266","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936266","url":null,"abstract":"In this demonstration proposal we describe a prototype of a radio environment map (REM) for storing and reasoning about spectrum data obtained from heterogeneous sources. The architecture of the REM prototype is both modular and extendible, and can be used with very diverse spectrum sensors, ranging from high-fidelity spectrum analyzers to dedicated low-cost embedded solutions. In the proposed demonstration we will illustrate how information such as transmitter locations and estimates of spectrum occupancy over space and time can be inferred and made available through the REM, based on information obtained from a network of different spectrum sensors deployed specifically for the demonstration.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115385862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936217
R. Davies, M. Ghosh
The use of TV White Spaces on a secondary, unlicensed basis has been of great interest recently in academia, industry and regulatory bodies worldwide. Central to this is the ability to sense incumbent TV signals (ATSC and DVB-T) at extremely low signal levels (−114 dBm to −120 dBm). These levels have been determined primarily through theoretical means, where worst-case interference situations have been considered with little or no probabilistic or measurement studies. While limited field measurements of ATSC sensing prototypes was part of the FCC rulemaking process, these tests were not used to determine appropriate sensing levels. No field testing of DVB-T sensing prototypes was done in Europe. In this paper we extend earlier work on algorithm development and laboratory testing for DVB-T sensing and present results obtained from field testing a prototype DVB-T sensor test bed using a hardware front-end followed by signal processing in software to show that the proposed level of −120 dBm may be too pessimistic: the sensor calibrated in a laboratory at about −115 dBm provided 100% detection of the main DVB-T transmitter for the area at all points in all test sites.
{"title":"Field trials of DVB-T sensing for TV White Spaces","authors":"R. Davies, M. Ghosh","doi":"10.1109/DYSPAN.2011.5936217","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936217","url":null,"abstract":"The use of TV White Spaces on a secondary, unlicensed basis has been of great interest recently in academia, industry and regulatory bodies worldwide. Central to this is the ability to sense incumbent TV signals (ATSC and DVB-T) at extremely low signal levels (−114 dBm to −120 dBm). These levels have been determined primarily through theoretical means, where worst-case interference situations have been considered with little or no probabilistic or measurement studies. While limited field measurements of ATSC sensing prototypes was part of the FCC rulemaking process, these tests were not used to determine appropriate sensing levels. No field testing of DVB-T sensing prototypes was done in Europe. In this paper we extend earlier work on algorithm development and laboratory testing for DVB-T sensing and present results obtained from field testing a prototype DVB-T sensor test bed using a hardware front-end followed by signal processing in software to show that the proposed level of −120 dBm may be too pessimistic: the sensor calibrated in a laboratory at about −115 dBm provided 100% detection of the main DVB-T transmitter for the area at all points in all test sites.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115734593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936205
Alexander W. Min, Kyu-Han Kim, K. Shin
Cooperative sensing, a key enabling technology for dynamic spectrum access, is vulnerable to various sensing-targeted attacks, such as the primary user emulation or spectrum sensing data falsification. These attacks can easily disrupt the primary signal detection process, thus crippling the operation of dynamic spectrum access. While such sensing-targeted attacks can be easily launched by an attacker, it is very challenging to design a robust cooperative spectrum sensing scheme due mainly to the practical constraints inherent in spectrum sensing, particularly the shared/open nature of the wireless medium and the unpredictability of signal propagation. In this paper, we develop an efficient, yet simple attack detection framework, called IRIS (robust cooperatIve sensing via iteRatIve State estimation), that safeguards the incumbent detection process by checking the consistency among sensing reports via the estimation of system states, namely, the primary user's transmit-power and path-loss exponent. The key insight behind the design of IRIS is that the sensing results are governed by the network topology and the law of signal propagation, which cannot be easily compromised by an attacker. Consequently, the sensing reports must demonstrate consistency among themselves in estimating system states. Our analytical and simulation results show that, by performing consistency-checks, IRIS provides high attack-detection capability, and preserves satisfactory performance in estimating the system states even under very challenging attack scenarios. Based on these observations, we propose a new incumbent detection rule that can further improve the spectrum efficiency. IRIS can be readily deployed in infrastructure-based cognitive radio networks, such as IEEE 802.22 WRANs, with manageable processing and communication overheads.
{"title":"Robust cooperative sensing via state estimation in cognitive radio networks","authors":"Alexander W. Min, Kyu-Han Kim, K. Shin","doi":"10.1109/DYSPAN.2011.5936205","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936205","url":null,"abstract":"Cooperative sensing, a key enabling technology for dynamic spectrum access, is vulnerable to various sensing-targeted attacks, such as the primary user emulation or spectrum sensing data falsification. These attacks can easily disrupt the primary signal detection process, thus crippling the operation of dynamic spectrum access. While such sensing-targeted attacks can be easily launched by an attacker, it is very challenging to design a robust cooperative spectrum sensing scheme due mainly to the practical constraints inherent in spectrum sensing, particularly the shared/open nature of the wireless medium and the unpredictability of signal propagation. In this paper, we develop an efficient, yet simple attack detection framework, called IRIS (robust cooperatIve sensing via iteRatIve State estimation), that safeguards the incumbent detection process by checking the consistency among sensing reports via the estimation of system states, namely, the primary user's transmit-power and path-loss exponent. The key insight behind the design of IRIS is that the sensing results are governed by the network topology and the law of signal propagation, which cannot be easily compromised by an attacker. Consequently, the sensing reports must demonstrate consistency among themselves in estimating system states. Our analytical and simulation results show that, by performing consistency-checks, IRIS provides high attack-detection capability, and preserves satisfactory performance in estimating the system states even under very challenging attack scenarios. Based on these observations, we propose a new incumbent detection rule that can further improve the spectrum efficiency. IRIS can be readily deployed in infrastructure-based cognitive radio networks, such as IEEE 802.22 WRANs, with manageable processing and communication overheads.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125131844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936264
S. Pollin, L. Hollevoet, P. Van Wesemael, M. Desmet, A. Bourdoux, E. Lopez, F. Naessens, P. Raghavan, V. Derudder, S. Dupont, A. Dejonghe
We demonstrate a reconfigurable engine for multipurpose spectrum sensing within the cost and power constraints of mobile devices. The analog part builds up on the Scaldio reconfigurable analog front-end [1]. The digital part is an innovative Digital Front-end for Sensing capable of performing a range of sensing algorithms [3], which has now been fully implemented as a chip. The goal of this demo is the first demonstration of the digital chip, integrated with an analog front-end, enabling real-time validation of the sensing engine. The setup is validated for DVB-T and LTE, two important candidates for future DySPAN networks, as well as for very fast spectrum sweeping. This is the first integrated low power solution that can achieve such a very fast spectrum sweeping, thanks to the integration of two innovative components.
{"title":"An integrated reconfigurable engine for multi-purpose sensing up to 6 GHz","authors":"S. Pollin, L. Hollevoet, P. Van Wesemael, M. Desmet, A. Bourdoux, E. Lopez, F. Naessens, P. Raghavan, V. Derudder, S. Dupont, A. Dejonghe","doi":"10.1109/DYSPAN.2011.5936264","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936264","url":null,"abstract":"We demonstrate a reconfigurable engine for multipurpose spectrum sensing within the cost and power constraints of mobile devices. The analog part builds up on the Scaldio reconfigurable analog front-end [1]. The digital part is an innovative Digital Front-end for Sensing capable of performing a range of sensing algorithms [3], which has now been fully implemented as a chip. The goal of this demo is the first demonstration of the digital chip, integrated with an analog front-end, enabling real-time validation of the sensing engine. The setup is validated for DVB-T and LTE, two important candidates for future DySPAN networks, as well as for very fast spectrum sweeping. This is the first integrated low power solution that can achieve such a very fast spectrum sweeping, thanks to the integration of two innovative components.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115185649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936240
Taskeen Nadkar, V. Thumar, Gautam Shenoy, Amit Mehta, U. Desai, S. Merchant
The prime focus of this work is in developing a Symbiotic Cooperative Relaying (SCR) architecture for the Commons model of Dynamic Spectrum Access. The incumbent Primary User (PU) of the spectrum, with a weak transmission link, seeks cooperation from the cognitive Secondary User (SU) nodes in its vicinity, and in return rewards them with a suitable incentive. The incentive may be offered in terms of time (Cognitive Relaying with Time Incentive), frequency bands (Cognitive Relaying with Frequency Incentive), or both (Cognitive Relaying with Time and Frequency Incentive). Cross-layer optimization problems are formulated, which maximize the transmission opportunities for the SUs in the multi-hop multichannel relay network, and offer a guaranteed throughput to the PU. To make the SCR scheme practically realizable, a MAC scheduling protocol is proposed within a unified framework for both the PU and SUs. Furthermore, cross-layer formulations are also proposed for multiple SUs to efficiently access the Time or Frequency Incentive for their own communication. Simulation results are furnished for each of the proposed SCR schemes to demonstrate their effectiveness from the perspective of both the PU and SUs.
{"title":"A cross-layer framework for symbiotic relaying in cognitive radio networks","authors":"Taskeen Nadkar, V. Thumar, Gautam Shenoy, Amit Mehta, U. Desai, S. Merchant","doi":"10.1109/DYSPAN.2011.5936240","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936240","url":null,"abstract":"The prime focus of this work is in developing a Symbiotic Cooperative Relaying (SCR) architecture for the Commons model of Dynamic Spectrum Access. The incumbent Primary User (PU) of the spectrum, with a weak transmission link, seeks cooperation from the cognitive Secondary User (SU) nodes in its vicinity, and in return rewards them with a suitable incentive. The incentive may be offered in terms of time (Cognitive Relaying with Time Incentive), frequency bands (Cognitive Relaying with Frequency Incentive), or both (Cognitive Relaying with Time and Frequency Incentive). Cross-layer optimization problems are formulated, which maximize the transmission opportunities for the SUs in the multi-hop multichannel relay network, and offer a guaranteed throughput to the PU. To make the SCR scheme practically realizable, a MAC scheduling protocol is proposed within a unified framework for both the PU and SUs. Furthermore, cross-layer formulations are also proposed for multiple SUs to efficiently access the Time or Frequency Incentive for their own communication. Simulation results are furnished for each of the proposed SCR schemes to demonstrate their effectiveness from the perspective of both the PU and SUs.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122891626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936237
Xi Zhang, J. Ansari, Guangwei Yang, P. Mahonen
Cognitive radios require fast reconfiguration of the protocol stack for dynamic spectrum access and run-time performance optimization. In order to provide rapid on-the-fly adaptability of PHY/MAC protocols, we have designed and implemented TRUMP: a Toolchain for RUn-tiMe Protocol realization. It includes a meta-language compiler, logic controller and an optimizer. TRUMP allows run-time realization and optimization of cognitive network protocols for the requirements of a particular application, communication capabilities of the radio, the current spectrum regulation and policies. TRUMP supports efficient multi-threading for multi-core platforms in order to meet variable computational requirements and to allow parallelization of PHY/MAC processing for cognitive radio systems. We have carried out the performance evaluation for different metrics on WARP SDR platform and embedded Linux based PCs. Our results indicate that TRUMP allows reconfiguration of protocols in the order of a few microseconds through run-time linking of different components, thus meeting the strict timeliness requirements imposed by PHY/MAC processing.
{"title":"TRUMP: Supporting efficient realization of protocols for cognitive radio networks","authors":"Xi Zhang, J. Ansari, Guangwei Yang, P. Mahonen","doi":"10.1109/DYSPAN.2011.5936237","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936237","url":null,"abstract":"Cognitive radios require fast reconfiguration of the protocol stack for dynamic spectrum access and run-time performance optimization. In order to provide rapid on-the-fly adaptability of PHY/MAC protocols, we have designed and implemented TRUMP: a Toolchain for RUn-tiMe Protocol realization. It includes a meta-language compiler, logic controller and an optimizer. TRUMP allows run-time realization and optimization of cognitive network protocols for the requirements of a particular application, communication capabilities of the radio, the current spectrum regulation and policies. TRUMP supports efficient multi-threading for multi-core platforms in order to meet variable computational requirements and to allow parallelization of PHY/MAC processing for cognitive radio systems. We have carried out the performance evaluation for different metrics on WARP SDR platform and embedded Linux based PCs. Our results indicate that TRUMP allows reconfiguration of protocols in the order of a few microseconds through run-time linking of different components, thus meeting the strict timeliness requirements imposed by PHY/MAC processing.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114144465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936224
Muhammad Imadur Rahman, Ali Behravant, H. Koorapaty, J. Sachs, K. Balachandran
This paper investigates the feasibility and broad implications of the use of 3GPP LTE systems in license-exempt situations. License-exempt use can occur in traditional unlicensed bands or in secondary usage of white space spectrum. Various scenarios for license-exempt use are listed with a particular focus on spectrum access as a secondary user. Regulatory requirements devised by Federal Communications Commission (FCC) for TV white space usage are described and tabulated. General principles and recommendations for license exempt spectrum usage are proposed with some important scenarios being identified. Additional requirements arise out of the need to share the spectrum with other potential users in a fair manner. System simulation results in an indoor setting are used to estimate spectral efficiencies under such conditions. We conclude that LTE can be used in license-exempt secondary usage scenario with only minor modifications, such as fair sharing procedures, and could benefit from support for higher order modulations.
{"title":"License-exempt LTE systems for secondary spectrum usage: Scenarios and first assessment","authors":"Muhammad Imadur Rahman, Ali Behravant, H. Koorapaty, J. Sachs, K. Balachandran","doi":"10.1109/DYSPAN.2011.5936224","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936224","url":null,"abstract":"This paper investigates the feasibility and broad implications of the use of 3GPP LTE systems in license-exempt situations. License-exempt use can occur in traditional unlicensed bands or in secondary usage of white space spectrum. Various scenarios for license-exempt use are listed with a particular focus on spectrum access as a secondary user. Regulatory requirements devised by Federal Communications Commission (FCC) for TV white space usage are described and tabulated. General principles and recommendations for license exempt spectrum usage are proposed with some important scenarios being identified. Additional requirements arise out of the need to share the spectrum with other potential users in a fair manner. System simulation results in an indoor setting are used to estimate spectral efficiencies under such conditions. We conclude that LTE can be used in license-exempt secondary usage scenario with only minor modifications, such as fair sharing procedures, and could benefit from support for higher order modulations.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128585115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936243
P. Van Wesemael, S. Pollin, E. Lopez, A. Dejonghe
Since the introduction of the Opportunistic Spectrum Access paradigm, focus has been on the development of sensing algorithms. Many of those techniques have been verified only through simulations. A small set of the techniques has been verified using off-the-shelf hardware, with limited capabilities, and spectrum analyzers with very good performance, however not realistic for low-power handheld solutions. In this paper, we propose sensing functionality for sensing of LTE and DVB-T signals. This functionality is then verified using a prototype RF front-end that is a realistic candidate for future Software Defined Radio (SDR) handheld solutions. The performance achieved with this front-end is also compared with the spectrum analyzer performance, for the same functionality. We conclude that the prototype achieves a sensing performance within 12dB of the performance achieved by the test equipment when using simple energy detection functionality. In the case of feature based sensing both systems achieve similar performance. In terms of sensitivity, the considered DVB-T sensing functionality achieves the target detection performance up to −102dBm with the sensing prototype over a bandwidth of 8 MHz and averaging 9 OFDM symbols.
{"title":"Performance evaluation of sensing solutions for LTE and DVB-T","authors":"P. Van Wesemael, S. Pollin, E. Lopez, A. Dejonghe","doi":"10.1109/DYSPAN.2011.5936243","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936243","url":null,"abstract":"Since the introduction of the Opportunistic Spectrum Access paradigm, focus has been on the development of sensing algorithms. Many of those techniques have been verified only through simulations. A small set of the techniques has been verified using off-the-shelf hardware, with limited capabilities, and spectrum analyzers with very good performance, however not realistic for low-power handheld solutions. In this paper, we propose sensing functionality for sensing of LTE and DVB-T signals. This functionality is then verified using a prototype RF front-end that is a realistic candidate for future Software Defined Radio (SDR) handheld solutions. The performance achieved with this front-end is also compared with the spectrum analyzer performance, for the same functionality. We conclude that the prototype achieves a sensing performance within 12dB of the performance achieved by the test equipment when using simple energy detection functionality. In the case of feature based sensing both systems achieve similar performance. In terms of sensitivity, the considered DVB-T sensing functionality achieves the target detection performance up to −102dBm with the sensing prototype over a bandwidth of 8 MHz and averaging 9 OFDM symbols.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121505918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-03DOI: 10.1109/DYSPAN.2011.5936234
H. Karimi
In this paper we present the detailed calculations which a geolocation database would need to perform in order to derive location-specific maximum permitted emission levels for white space devices (WSDs) operating in digital terrestrial TV (DTT) bands. We introduce a novel methodology for the calculation of such emission levels, whereby the extent of protection afforded to the DTT service is specified in terms of a maximum permitted degradation in the DTT service location probability. We illustrate how national DTT network planning models can be used to provide the necessary parameters for a geolocation database to perform the necessary calculations. We explain how the calculated emission levels need to be post-processed in order to derive consistent WSD regulatory emission limits for the simultaneous protection of multiple DTT channels. We finally use numerical examples to show that the resulting WSD regulatory emission limits can be quite high in areas where the DTT coverage quality is good and the DTT service is therefore relatively immune to interference from WSDs.
{"title":"Geolocation databases for white space devices in the UHF TV bands: Specification of maximum permitted emission levels","authors":"H. Karimi","doi":"10.1109/DYSPAN.2011.5936234","DOIUrl":"https://doi.org/10.1109/DYSPAN.2011.5936234","url":null,"abstract":"In this paper we present the detailed calculations which a geolocation database would need to perform in order to derive location-specific maximum permitted emission levels for white space devices (WSDs) operating in digital terrestrial TV (DTT) bands. We introduce a novel methodology for the calculation of such emission levels, whereby the extent of protection afforded to the DTT service is specified in terms of a maximum permitted degradation in the DTT service location probability. We illustrate how national DTT network planning models can be used to provide the necessary parameters for a geolocation database to perform the necessary calculations. We explain how the calculated emission levels need to be post-processed in order to derive consistent WSD regulatory emission limits for the simultaneous protection of multiple DTT channels. We finally use numerical examples to show that the resulting WSD regulatory emission limits can be quite high in areas where the DTT coverage quality is good and the DTT service is therefore relatively immune to interference from WSDs.","PeriodicalId":119856,"journal":{"name":"2011 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126023148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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