Pub Date : 2013-12-11DOI: 10.1109/PIMRC.2013.6666291
Yang Li, Yafei Tian, Chenyang Yang
Coordinated beamforming has been optimized to maximize the sum rate under the transmit power constraints, or to minimize the transmit power under the data rate constraints. In this paper, we study coordinated beamforming to maximize the energy efficiency (EE) of multi-cell multi-antenna systems meanwhile ensuring the individual data rate requirement of each user. To find a solution of the non-convex optimization problem for the precoding design, we construct a convex subset of the original constraint set and a quasi-concave lower bound of the EE. Then, we propose an iterative algorithm to maximize the lower bound of the EE within the convex subset. We evaluate the EE of the proposed algorithm through simulations under different data rate requirements, user locations, and cell-edge signal-to-noise ratios. The results demonstrate that the proposed precoder is much more energy-efficient than the transmit power minimization precoder when the circuit power consumption dominates, and always outperforms two interference-free transmission schemes with the optimized transmit power toward maximizing the EE.
{"title":"Energy-efficient coordinated beamforming with individual data rate constraints","authors":"Yang Li, Yafei Tian, Chenyang Yang","doi":"10.1109/PIMRC.2013.6666291","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666291","url":null,"abstract":"Coordinated beamforming has been optimized to maximize the sum rate under the transmit power constraints, or to minimize the transmit power under the data rate constraints. In this paper, we study coordinated beamforming to maximize the energy efficiency (EE) of multi-cell multi-antenna systems meanwhile ensuring the individual data rate requirement of each user. To find a solution of the non-convex optimization problem for the precoding design, we construct a convex subset of the original constraint set and a quasi-concave lower bound of the EE. Then, we propose an iterative algorithm to maximize the lower bound of the EE within the convex subset. We evaluate the EE of the proposed algorithm through simulations under different data rate requirements, user locations, and cell-edge signal-to-noise ratios. The results demonstrate that the proposed precoder is much more energy-efficient than the transmit power minimization precoder when the circuit power consumption dominates, and always outperforms two interference-free transmission schemes with the optimized transmit power toward maximizing the EE.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117258133","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666418
Jiandong Li, Honghao Ju, Yan Long, Xiaoniu Yang
In this paper, we discuss how to exploit the multiple access points diversity gain in the downlink transmission of a multi-access wireless network. To follow the current user equipment hardware constraint as well as to reduce the network control overhead, we confine that each user equipment can only be serviced by one best suited access point. To achieve this, we formulate such problem as a non-linear integer program, which typically is computational intractable. To derive its solution, we first convert it to a linear integer program, which is then used to obtain a fractional solution, and further we refine the fractional solution to be integer to satisfy integer constraints for the access point selection and the resource unit allocation. By doing so, our algorithm has a low computational complexity. We also show the performance improvement of our algorithm over the distance based AP selection and the random AP selection methods through simulation.
{"title":"Exploiting multiple access points diversity gain in the multi-access wireless network","authors":"Jiandong Li, Honghao Ju, Yan Long, Xiaoniu Yang","doi":"10.1109/PIMRC.2013.6666418","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666418","url":null,"abstract":"In this paper, we discuss how to exploit the multiple access points diversity gain in the downlink transmission of a multi-access wireless network. To follow the current user equipment hardware constraint as well as to reduce the network control overhead, we confine that each user equipment can only be serviced by one best suited access point. To achieve this, we formulate such problem as a non-linear integer program, which typically is computational intractable. To derive its solution, we first convert it to a linear integer program, which is then used to obtain a fractional solution, and further we refine the fractional solution to be integer to satisfy integer constraints for the access point selection and the resource unit allocation. By doing so, our algorithm has a low computational complexity. We also show the performance improvement of our algorithm over the distance based AP selection and the random AP selection methods through simulation.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123685062","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666364
Wahyu Pramudito, E. Alsusa
This paper proposes and analyzes a new cooperative diversity technique that combines users pairing and interference exploitation for enhancing the uplink transmission performance in uplink OFDMA systems suitable for 4G technology. The underlying principle is to pair users on the basis of best interuser channel by utilizing low transmit power communication in the unlicensed band to exchange data symbols. Then, each pair remap their combined symbols according to a predefined rule such that they transmit the same constellation using single dimensional OFDMA to ensure that the signals of each pair combine constructively at the destination. As well as achieving a diversity order of two, the proposed technique attains further performance enhancements by exploiting co-channel interference. The impact of the proposed technique on various modulation orders is considered in this paper. The performance is assessed through Monte Carlo simulation and accurate mathematical analysis. It will be shown that the results from both models closely match and demonstrate that significant BER reduction as well as throughput enhancement are obtained relative to other uplink OFDMA transmission techniques.
{"title":"A dynamic pairing diversity with interference exploitation for high throughput 4G systems","authors":"Wahyu Pramudito, E. Alsusa","doi":"10.1109/PIMRC.2013.6666364","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666364","url":null,"abstract":"This paper proposes and analyzes a new cooperative diversity technique that combines users pairing and interference exploitation for enhancing the uplink transmission performance in uplink OFDMA systems suitable for 4G technology. The underlying principle is to pair users on the basis of best interuser channel by utilizing low transmit power communication in the unlicensed band to exchange data symbols. Then, each pair remap their combined symbols according to a predefined rule such that they transmit the same constellation using single dimensional OFDMA to ensure that the signals of each pair combine constructively at the destination. As well as achieving a diversity order of two, the proposed technique attains further performance enhancements by exploiting co-channel interference. The impact of the proposed technique on various modulation orders is considered in this paper. The performance is assessed through Monte Carlo simulation and accurate mathematical analysis. It will be shown that the results from both models closely match and demonstrate that significant BER reduction as well as throughput enhancement are obtained relative to other uplink OFDMA transmission techniques.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124858934","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666180
A. P. Shrestha, K. Kwak
We investigate the physical layer security for opportunistic scheduling scheme using transmit antenna selection (TAS) with maximal ratio combining (MRC) at receiver and eavesdropper under a quasi-static Rayleigh fading channel. We assume a scenario composed of a single transmitter, multiple users and a single eavesdropper each equipped with multiple antennas. The transmitter selects best transmit antenna and best user to enhance the secure communication. A theoretical analysis is performed to derive new closed form expressions for probability of positive secrecy and outage probability at a normalized secrecy rate. Furthermore, asymptotic analysis on the outage probability reveals the outage diversity gain and array gain. It is confirmed that number of antennas at eavesdropper impacts on secrecy array gain while the outage diversity gain is determined by the product of number of users and antennas at the transmitter and the user. From numerical results, TAS is verified as a suitable option for secure opportunistic scheduling.
{"title":"Secure opportunistic scheduling with transmit antenna selection","authors":"A. P. Shrestha, K. Kwak","doi":"10.1109/PIMRC.2013.6666180","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666180","url":null,"abstract":"We investigate the physical layer security for opportunistic scheduling scheme using transmit antenna selection (TAS) with maximal ratio combining (MRC) at receiver and eavesdropper under a quasi-static Rayleigh fading channel. We assume a scenario composed of a single transmitter, multiple users and a single eavesdropper each equipped with multiple antennas. The transmitter selects best transmit antenna and best user to enhance the secure communication. A theoretical analysis is performed to derive new closed form expressions for probability of positive secrecy and outage probability at a normalized secrecy rate. Furthermore, asymptotic analysis on the outage probability reveals the outage diversity gain and array gain. It is confirmed that number of antennas at eavesdropper impacts on secrecy array gain while the outage diversity gain is determined by the product of number of users and antennas at the transmitter and the user. From numerical results, TAS is verified as a suitable option for secure opportunistic scheduling.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"43 4-7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132969965","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666610
Ajay Singh, M. Bhatnagar, R. Mallik
In the existing literature, a single sample based improved energy detector has been analyzed for multiple antennas based cooperative spectrum sensing. In this paper, we derive the expressions of the probability of false alarm and missed detection of multiple antenna based dual-hop cooperative spectrum sensing scheme which uses multiple samples of the primary user's signal in the improved energy detector. By minimizing the total error rate (weighted sum of the probability of missed detection and probability of false alarm), we derive a closed-form solution of optimal number of CRs required for dual-hop cooperation. It is shown by simulations that this generalized scheme significantly outperforms the conventional energy detector based spectrum sensing, while keeping quality-of-service in desired limits. A multi-hop cognitive radio network containing multiple antenna based CRs and using an improved energy detector with multiple samples is also analyzed in this paper. It is inferred by analysis and simulation that the error performance of the multi-hop cognitive relaying can be significantly improved by using multiple antennas and improved energy detector.
{"title":"Performance analysis of multiple sample based improved energy detector in collaborative CR networks","authors":"Ajay Singh, M. Bhatnagar, R. Mallik","doi":"10.1109/PIMRC.2013.6666610","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666610","url":null,"abstract":"In the existing literature, a single sample based improved energy detector has been analyzed for multiple antennas based cooperative spectrum sensing. In this paper, we derive the expressions of the probability of false alarm and missed detection of multiple antenna based dual-hop cooperative spectrum sensing scheme which uses multiple samples of the primary user's signal in the improved energy detector. By minimizing the total error rate (weighted sum of the probability of missed detection and probability of false alarm), we derive a closed-form solution of optimal number of CRs required for dual-hop cooperation. It is shown by simulations that this generalized scheme significantly outperforms the conventional energy detector based spectrum sensing, while keeping quality-of-service in desired limits. A multi-hop cognitive radio network containing multiple antenna based CRs and using an improved energy detector with multiple samples is also analyzed in this paper. It is inferred by analysis and simulation that the error performance of the multi-hop cognitive relaying can be significantly improved by using multiple antennas and improved energy detector.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125711915","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666359
Liang Zhou, Y. Ohashi
Uniform linear array (ULA) multiple-input multiple-output (MIMO) systems with spatial multiplexing for millimeter wave in line-of-sight (LOS) links can enable the maximum capacity transmission, since the channel matrix can be made orthogonal by choosing the antenna spacing appropriately as a function of range, carrier wavelength and the number of antennas for ULAs. In this paper, we demonstrate that variations in range can cause significant degradation in performance such as large condition number and low channel capacity for a ULA optimized at a given range. Base on the condition number or capacity of the LOS MIMO channel, we design the optimized non-uniform antenna arrays that can alleviate this problem by keeping small condition number or large capacity over a significantly larger set of ranges than uniformly spaced antenna arrays. And furthermore, based on the optimized results, we find out a simple placement of antenna arrays which can avoid significant performance degradation near the optimized range.
{"title":"Design of non-uniform antenna arrays for robust millimeter-wave LOS MIMO communications","authors":"Liang Zhou, Y. Ohashi","doi":"10.1109/PIMRC.2013.6666359","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666359","url":null,"abstract":"Uniform linear array (ULA) multiple-input multiple-output (MIMO) systems with spatial multiplexing for millimeter wave in line-of-sight (LOS) links can enable the maximum capacity transmission, since the channel matrix can be made orthogonal by choosing the antenna spacing appropriately as a function of range, carrier wavelength and the number of antennas for ULAs. In this paper, we demonstrate that variations in range can cause significant degradation in performance such as large condition number and low channel capacity for a ULA optimized at a given range. Base on the condition number or capacity of the LOS MIMO channel, we design the optimized non-uniform antenna arrays that can alleviate this problem by keeping small condition number or large capacity over a significantly larger set of ranges than uniformly spaced antenna arrays. And furthermore, based on the optimized results, we find out a simple placement of antenna arrays which can avoid significant performance degradation near the optimized range.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"294 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126807286","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666111
Dong Fang, A. Burr
In this paper, we propose a novel multilevel coded linear physical-layer network coding scheme with extended mapping (LPNC-EM) for Rayleigh fading two-way relay channels (TWRC). The relay node adaptively selects the linear generator matrix and directly maps the superimposed signal of the two users into the linear network coded combination over the hybrid Galois Field (GF(22) or GF(23)). The selection criterion ensures unambiguous decoding and maximizes the individual rate of each user. The LPNC-EM scheme forms two or three independent coding levels which facilitate the use of multilevel coding. This enables the hierarchical decode-and-forward paradigm as in [3]. The numerical results show that uncoded LPNC-EM outperforms the original physical-layer network coding (PNC) and can achieve a error performance as good as the 5QAM denoise-and-forward in [2]. Furthermore, the multilevel coded LPNC-EM also provides a superior error performance compared with the coded original PNC.
{"title":"Multilevel coded linear physical-layer network coding with extended mapping in Galois Field for Rayleigh fading two-way relay channels","authors":"Dong Fang, A. Burr","doi":"10.1109/PIMRC.2013.6666111","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666111","url":null,"abstract":"In this paper, we propose a novel multilevel coded linear physical-layer network coding scheme with extended mapping (LPNC-EM) for Rayleigh fading two-way relay channels (TWRC). The relay node adaptively selects the linear generator matrix and directly maps the superimposed signal of the two users into the linear network coded combination over the hybrid Galois Field (GF(22) or GF(23)). The selection criterion ensures unambiguous decoding and maximizes the individual rate of each user. The LPNC-EM scheme forms two or three independent coding levels which facilitate the use of multilevel coding. This enables the hierarchical decode-and-forward paradigm as in [3]. The numerical results show that uncoded LPNC-EM outperforms the original physical-layer network coding (PNC) and can achieve a error performance as good as the 5QAM denoise-and-forward in [2]. Furthermore, the multilevel coded LPNC-EM also provides a superior error performance compared with the coded original PNC.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115263492","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666579
Bo Xie, Ming Xu, Jérôme Härri, Yingwen Chen
Urban traffic congestions have become a financial and societal burden in many cities. Efficient traffic management solutions mitigating such congestions require a reliable modeling and estimation of traffic jams. In urban traffic, the modeling challenges are related to flow collisions and gridlocks created at intersections. In this paper, we propose a traffic light extended Cell Transmission Model (CTM), where the influence of flow collisions and gridlocks are modeled by a single CK parameter. Our approach only requires adapting CK for each intersection type/geometry instead of a complex mathematical formulae proposed in related works. We formalize the description of our urban CTM, and evaluate its capability to model traffic volumes and jams against the microscopic traffic simulator SUMO (Simulation of Urban MObility). Results show that the CK parameter is able to closely reproduce the impact of collisions and gridlocks on traffic jam, making the proposed urban CTM suitable to predict traffic congestions in urban environments.
{"title":"A traffic light extension to Cell Transmission Model for estimating urban traffic jam","authors":"Bo Xie, Ming Xu, Jérôme Härri, Yingwen Chen","doi":"10.1109/PIMRC.2013.6666579","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666579","url":null,"abstract":"Urban traffic congestions have become a financial and societal burden in many cities. Efficient traffic management solutions mitigating such congestions require a reliable modeling and estimation of traffic jams. In urban traffic, the modeling challenges are related to flow collisions and gridlocks created at intersections. In this paper, we propose a traffic light extended Cell Transmission Model (CTM), where the influence of flow collisions and gridlocks are modeled by a single CK parameter. Our approach only requires adapting CK for each intersection type/geometry instead of a complex mathematical formulae proposed in related works. We formalize the description of our urban CTM, and evaluate its capability to model traffic volumes and jams against the microscopic traffic simulator SUMO (Simulation of Urban MObility). Results show that the CK parameter is able to closely reproduce the impact of collisions and gridlocks on traffic jam, making the proposed urban CTM suitable to predict traffic congestions in urban environments.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116728176","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666618
Wei Luo, Yusheng Ji, Aihuang Guo
As one of the key technical challenges in long term evolution (LTE)-Advanced heterogeneous networks (HetNets) is intercell interference coordination, many different schemes, such as coordinated multipoint (CoMP) and almost blank subframe (ABS) schemes, have been proposed in this field. Different cells are pushed to cooperate to eliminate intercell interference in CoMP coordinated beamforming, but performance is heavily dependent on the quality of channels. ABS schemes allow highpower cells to transmit almost blank subframes, and avoid interference with low-power cell edge users, which will in turn result in reduced high-power cell throughput as cost. An adaptive ABS-CoMP scheme in an LTE-Advanced HetNet is proposed, which combines both the ABS and CoMP coordinated beamforming schemes to eliminate intercell interference, and adaptive transmits signals in different ways. It is assumed to improve system throughput and mitigate signaling overhead and computational complexity. The results from simulations demonstrated that the proposed scheme outperformed the ABS and CoMP schemes, and achieved considerable system throughput gains in Config.4b scenarios defined by 3GPP.
{"title":"An adaptive ABS-CoMP scheme in LTE-Advanced heterogeneous networks","authors":"Wei Luo, Yusheng Ji, Aihuang Guo","doi":"10.1109/PIMRC.2013.6666618","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666618","url":null,"abstract":"As one of the key technical challenges in long term evolution (LTE)-Advanced heterogeneous networks (HetNets) is intercell interference coordination, many different schemes, such as coordinated multipoint (CoMP) and almost blank subframe (ABS) schemes, have been proposed in this field. Different cells are pushed to cooperate to eliminate intercell interference in CoMP coordinated beamforming, but performance is heavily dependent on the quality of channels. ABS schemes allow highpower cells to transmit almost blank subframes, and avoid interference with low-power cell edge users, which will in turn result in reduced high-power cell throughput as cost. An adaptive ABS-CoMP scheme in an LTE-Advanced HetNet is proposed, which combines both the ABS and CoMP coordinated beamforming schemes to eliminate intercell interference, and adaptive transmits signals in different ways. It is assumed to improve system throughput and mitigate signaling overhead and computational complexity. The results from simulations demonstrated that the proposed scheme outperformed the ABS and CoMP schemes, and achieved considerable system throughput gains in Config.4b scenarios defined by 3GPP.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122639178","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 : 2013-12-11DOI: 10.1109/PIMRC.2013.6666665
F. Bouali, O. Sallent, J. Pérez-Romero
To increase cognitive radio operation efficiency, this paper proposes a new knowledge management functional architecture, based on the fittingness factor concept, for supporting spectrum management in non-stationary environments. It includes a reliability tester module that detects, based on hypothesis testing, relevant changes in suitability levels of spectrum resources to support a set of heterogeneous applications. These changes are captured through a set of advanced statistics stored in a knowledge database and exploited by a proactive spectrum management strategy to assist both spectrum selection and spectrum mobility functionalities. The results reveal that the proposed reliability tester is able to disregard the changes due to the intrinsic randomness of the radio environment and to efficiently detect actual changes in interference conditions of spectrum pools. Thanks to this support, the proposed spectrum management strategy exhibits substantial robustness when the environment becomes non-stationary, obtaining performance improvements of up to 75% with respect to the reference case that does not make use of the reliability tester functionality.
{"title":"Knowledge management framework for robust cognitive radio operation in non-stationary environments","authors":"F. Bouali, O. Sallent, J. Pérez-Romero","doi":"10.1109/PIMRC.2013.6666665","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666665","url":null,"abstract":"To increase cognitive radio operation efficiency, this paper proposes a new knowledge management functional architecture, based on the fittingness factor concept, for supporting spectrum management in non-stationary environments. It includes a reliability tester module that detects, based on hypothesis testing, relevant changes in suitability levels of spectrum resources to support a set of heterogeneous applications. These changes are captured through a set of advanced statistics stored in a knowledge database and exploited by a proactive spectrum management strategy to assist both spectrum selection and spectrum mobility functionalities. The results reveal that the proposed reliability tester is able to disregard the changes due to the intrinsic randomness of the radio environment and to efficiently detect actual changes in interference conditions of spectrum pools. Thanks to this support, the proposed spectrum management strategy exhibits substantial robustness when the environment becomes non-stationary, obtaining performance improvements of up to 75% with respect to the reference case that does not make use of the reliability tester functionality.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122644374","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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