Pub Date : 2015-12-03DOI: 10.1109/PIMRC.2015.7343446
Yi Ren, D. Liu, Chao Wang, Fuqiang Liu, Erwu Liu
This paper studies how to efficiently reduce the mutual interference between primary and secondary networks. Different to conventional cognitive system, in which primary and secondary networks have no information exchange, the media access control mechanism we propose allow an operating PU to share the length of its remaining occupation time to SUs. With the help of such information exchange, the primary network can be better protected and the secondary network has the potential to reduce the energy consumed by spectrum sensing. To realize such a dynamic information sharing, we propose a novel spectrum-sculpting-aided scheme in this paper. Specifically, the PU deliberately inserts one zero-subcarrier into its data carriers, and uses the zero-subcarrier's position to claim its status. Through two-step sensing, each SU can attain the PU's remaining operation time, and then adjust its sensing strategy to avoid interference to the PU. Analysis of interference probability, together with simulation results, clearly exhibit the advantages of the proposed scheme in terms of the mutual interference and the amount of SU's sensing times.
{"title":"Spectram-sculpting-aided interference avoidance for OFDM-based cognitive networks","authors":"Yi Ren, D. Liu, Chao Wang, Fuqiang Liu, Erwu Liu","doi":"10.1109/PIMRC.2015.7343446","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343446","url":null,"abstract":"This paper studies how to efficiently reduce the mutual interference between primary and secondary networks. Different to conventional cognitive system, in which primary and secondary networks have no information exchange, the media access control mechanism we propose allow an operating PU to share the length of its remaining occupation time to SUs. With the help of such information exchange, the primary network can be better protected and the secondary network has the potential to reduce the energy consumed by spectrum sensing. To realize such a dynamic information sharing, we propose a novel spectrum-sculpting-aided scheme in this paper. Specifically, the PU deliberately inserts one zero-subcarrier into its data carriers, and uses the zero-subcarrier's position to claim its status. Through two-step sensing, each SU can attain the PU's remaining operation time, and then adjust its sensing strategy to avoid interference to the PU. Analysis of interference probability, together with simulation results, clearly exhibit the advantages of the proposed scheme in terms of the mutual interference and the amount of SU's sensing times.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132471398","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343476
Lei You, Lei Lei, D. Yuan
As one of the Coordinated Multipoint (CoMP) techniques, Joint Transmission (JT) can improve the overall system performance. In this paper, from the load balancing perspective, we study how the maximum load can be reduced by optimizing JT pattern that characterizes the association between cells and User Equipments (UEs). To give a model of the interference caused by cells with different time-frequency resource usage, we extend a load coupling model, by taking into account JT. In this model, the mutual interference depends on the load of cells coupled in a non-linear system with each other. Under this model, we study a two-cell case and proved that the optimality is achieved in linear time in the number of UEs. After showing the complexity of load balancing in the general network scenario, an iterative algorithm for minimizing the maximum load, named JT-MinMax, is proposed. We evaluate JT-MinMax in a Heterogeneous Network (HetNet), though it is not limited to this type of scenarios. Numerical results demonstrate the significant performance improvement of JT-MinMax on min-max cell load, compared to the conventional non-JT solution where each UE is served by the cell with best received transmit signal.
{"title":"Load balancing via joint transmission in heterogeneous LTE: Modeling and computation","authors":"Lei You, Lei Lei, D. Yuan","doi":"10.1109/PIMRC.2015.7343476","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343476","url":null,"abstract":"As one of the Coordinated Multipoint (CoMP) techniques, Joint Transmission (JT) can improve the overall system performance. In this paper, from the load balancing perspective, we study how the maximum load can be reduced by optimizing JT pattern that characterizes the association between cells and User Equipments (UEs). To give a model of the interference caused by cells with different time-frequency resource usage, we extend a load coupling model, by taking into account JT. In this model, the mutual interference depends on the load of cells coupled in a non-linear system with each other. Under this model, we study a two-cell case and proved that the optimality is achieved in linear time in the number of UEs. After showing the complexity of load balancing in the general network scenario, an iterative algorithm for minimizing the maximum load, named JT-MinMax, is proposed. We evaluate JT-MinMax in a Heterogeneous Network (HetNet), though it is not limited to this type of scenarios. Numerical results demonstrate the significant performance improvement of JT-MinMax on min-max cell load, compared to the conventional non-JT solution where each UE is served by the cell with best received transmit signal.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"111 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132966142","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343621
Keita Nagashima, Shotaro Kamiya, Koji Yamamoto, T. Nishio, M. Morikura, Tomoyuki Sugihara
In dense wireless local area network (WLAN) environments, the haphazard deployment of WLAN devices causes them to overlap. In such situations, a coverage adaptation through transmission power control (TPC) is required. At the same time, coverage holes should be taken into consideration for connectivity maintenance among devices. In this paper, a TPC scheme is proposed that reduces overlaps in an autonomous manner, without generating target coverage holes. The problem is formulated as a target coverage problem, in which wireless stations (STAs) are treated as target points, and the transmission power is appropriately controlled by the proposed scheme. In addition, we prove that the target coverage game is a potential game, and the proposed method is guaranteed to converge to a Nash equilibrium after a finite number of iterations. In order to prevent the occurrence of coverage holes that cannot be detected by the available STA information, we propose the exclusion of coverage boundary access points (APs) from reducing transmission power, with the idea that each boundary AP always contains the region covered by it alone. The coverage boundary APs are determined through Delaunay triangulation of all APs. The proposed scheme is evaluated by performing some simulations. The simulation results indicate that the proposed TPC scheme is effective in reducing coverage overlaps without generating coverage holes.
{"title":"Coverage adaptation focusing on coverage boundary in densely deployed WLANs: Potential game approach","authors":"Keita Nagashima, Shotaro Kamiya, Koji Yamamoto, T. Nishio, M. Morikura, Tomoyuki Sugihara","doi":"10.1109/PIMRC.2015.7343621","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343621","url":null,"abstract":"In dense wireless local area network (WLAN) environments, the haphazard deployment of WLAN devices causes them to overlap. In such situations, a coverage adaptation through transmission power control (TPC) is required. At the same time, coverage holes should be taken into consideration for connectivity maintenance among devices. In this paper, a TPC scheme is proposed that reduces overlaps in an autonomous manner, without generating target coverage holes. The problem is formulated as a target coverage problem, in which wireless stations (STAs) are treated as target points, and the transmission power is appropriately controlled by the proposed scheme. In addition, we prove that the target coverage game is a potential game, and the proposed method is guaranteed to converge to a Nash equilibrium after a finite number of iterations. In order to prevent the occurrence of coverage holes that cannot be detected by the available STA information, we propose the exclusion of coverage boundary access points (APs) from reducing transmission power, with the idea that each boundary AP always contains the region covered by it alone. The coverage boundary APs are determined through Delaunay triangulation of all APs. The proposed scheme is evaluated by performing some simulations. The simulation results indicate that the proposed TPC scheme is effective in reducing coverage overlaps without generating coverage holes.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132099422","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343336
Seong Ki Yoo, S. Cotton, P. Sofotasios, M. Matthaiou, M. Valkama, G. Karagiannidis
Statistical distributions have been extensively used in modeling fading effects in conventional and modern wireless communications. In the present work, we propose a novel κ - μ composite shadowed fading model, which is based on the valid assumption that the mean signal power follows the inverse gamma distribution instead of the lognormal or commonly used gamma distributions. This distribution has a simple relationship with the gamma distribution, but most importantly, its semi heavy-tailed characteristics constitute it suitable for applications relating to modeling of shadowed fading. Furthermore, the derived probability density function of the κ - μ / inverse gamma composite distribution admits a rather simple algebraic representation that renders it convenient to handle both analytically and numerically. The validity and utility of this fading model are demonstrated by means of modeling the fading effects encountered in body centric communications channels, which have been known to be susceptible to the shadowing effect. To this end, extensive comparisons are provided between theoretical and respective real-time measurement results. It is shown that these comparisons exhibit accurate fitting of the new model for various measurement set ups that correspond to realistic communication scenarios.
{"title":"The K — μ / inverse gamma fading model","authors":"Seong Ki Yoo, S. Cotton, P. Sofotasios, M. Matthaiou, M. Valkama, G. Karagiannidis","doi":"10.1109/PIMRC.2015.7343336","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343336","url":null,"abstract":"Statistical distributions have been extensively used in modeling fading effects in conventional and modern wireless communications. In the present work, we propose a novel κ - μ composite shadowed fading model, which is based on the valid assumption that the mean signal power follows the inverse gamma distribution instead of the lognormal or commonly used gamma distributions. This distribution has a simple relationship with the gamma distribution, but most importantly, its semi heavy-tailed characteristics constitute it suitable for applications relating to modeling of shadowed fading. Furthermore, the derived probability density function of the κ - μ / inverse gamma composite distribution admits a rather simple algebraic representation that renders it convenient to handle both analytically and numerically. The validity and utility of this fading model are demonstrated by means of modeling the fading effects encountered in body centric communications channels, which have been known to be susceptible to the shadowing effect. To this end, extensive comparisons are provided between theoretical and respective real-time measurement results. It is shown that these comparisons exhibit accurate fitting of the new model for various measurement set ups that correspond to realistic communication scenarios.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130899915","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343305
Wenxiu Zhao, Chunyan Feng, Fangfang Liu, Caili Guo, Yao Nie
Full duplex systems are more spectrally efficient than conventional half duplex systems if the self-interference (SI) can be significantly mitigated. Digital cancellation is one of the lowest complexity SI cancellation techniques in full duplex systems. However, its mitigation capability is mainly limited by the power amplifier (PA) nonlinear distortion. In this paper, to cancel the SI induced by the PA nonlinear distortion, a SI cancellation scheme based on polarization mismatch (PMC) is proposed. The proposed scheme takes advantage of the characteristic that the polarization state of the SI is immune to the PA nonlinearity. And it cancels the SI in the digital baseband by a polarization mismatch matrix which has an orthogonal polarization state to that of the SI. Analysis and numerical results demonstrate that the proposed scheme can cancel the nonlinear SI induced by the PA efficiently. Besides, the desired signal to interfere and noise (SINR) gain will not deteriorate even if the power of the SI is high compared with the existing cancellation scheme. Further, the achievable rate of it can reach more than two times compared with the half duplex when the similarity coefficient of the polarization states is greater than 0.5.
{"title":"Polarization mismatch based self-interference cancellation against power amplifier nonlinear distortion in full duplex systems","authors":"Wenxiu Zhao, Chunyan Feng, Fangfang Liu, Caili Guo, Yao Nie","doi":"10.1109/PIMRC.2015.7343305","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343305","url":null,"abstract":"Full duplex systems are more spectrally efficient than conventional half duplex systems if the self-interference (SI) can be significantly mitigated. Digital cancellation is one of the lowest complexity SI cancellation techniques in full duplex systems. However, its mitigation capability is mainly limited by the power amplifier (PA) nonlinear distortion. In this paper, to cancel the SI induced by the PA nonlinear distortion, a SI cancellation scheme based on polarization mismatch (PMC) is proposed. The proposed scheme takes advantage of the characteristic that the polarization state of the SI is immune to the PA nonlinearity. And it cancels the SI in the digital baseband by a polarization mismatch matrix which has an orthogonal polarization state to that of the SI. Analysis and numerical results demonstrate that the proposed scheme can cancel the nonlinear SI induced by the PA efficiently. Besides, the desired signal to interfere and noise (SINR) gain will not deteriorate even if the power of the SI is high compared with the existing cancellation scheme. Further, the achievable rate of it can reach more than two times compared with the half duplex when the similarity coefficient of the polarization states is greater than 0.5.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130925419","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343631
Wei Liu, Y. Shoji, R. Shinkuma
Rapid increase of elderly population in the world is motivating innovative technologies for healthcare services that are both high-quality and cost-effective. Wireless sensor networks (WSNs) based smart home for assisted living is one of the most prosperous solutions to this area, since it removes the requirement of deploying wired devices and is easy to be implemented in existing home environments. However, limited battery capacity of sensor nodes constraints the lifetime of WSNs and prevents this solution to be widely accepted by the industry. Therefore, this paper proposes a logical correlation-based sleep scheduling mechanism (LCSSM) to achieve energy-efficient WSNs in smart homes. LCSSM first automatically generates logical correlations between sensors by learning from living patterns of different home residents. It then activates/deactivates sensors according to their logical correlations to reduce energy consumption. Numerical evaluation results based on real datasets have validated that the proposed LCSSM not only reduces energy consumption of WSNs significantly, but also retains the quality of sensing successfully. Specifically speaking, sensors with LCSSM successfully sense more than 94% valuable events occurred in the smart home with only 23%-57% active time of the whole evaluation period.
{"title":"Logical correlation-based sleep scheduling for energy-efficient WSNs in smart homes","authors":"Wei Liu, Y. Shoji, R. Shinkuma","doi":"10.1109/PIMRC.2015.7343631","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343631","url":null,"abstract":"Rapid increase of elderly population in the world is motivating innovative technologies for healthcare services that are both high-quality and cost-effective. Wireless sensor networks (WSNs) based smart home for assisted living is one of the most prosperous solutions to this area, since it removes the requirement of deploying wired devices and is easy to be implemented in existing home environments. However, limited battery capacity of sensor nodes constraints the lifetime of WSNs and prevents this solution to be widely accepted by the industry. Therefore, this paper proposes a logical correlation-based sleep scheduling mechanism (LCSSM) to achieve energy-efficient WSNs in smart homes. LCSSM first automatically generates logical correlations between sensors by learning from living patterns of different home residents. It then activates/deactivates sensors according to their logical correlations to reduce energy consumption. Numerical evaluation results based on real datasets have validated that the proposed LCSSM not only reduces energy consumption of WSNs significantly, but also retains the quality of sensing successfully. Specifically speaking, sensors with LCSSM successfully sense more than 94% valuable events occurred in the smart home with only 23%-57% active time of the whole evaluation period.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131012824","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343428
Bin Wang, Yang Sun, Xinmiao Liu, Yongyu Chang, Dacheng Yang
In this article, we investigate the capacity of large-scale multiple-input multiple-output (MIMO) multiple access channels (MACs) with linear receivers in ultra dense networks (UDNs) where the number of antennas at the base station and the number of total interfering terminals approach to infinity while maintaining a fixed ratio. To study the multicell uplink capacity of a large-scale MIMO system, we first find the probability distribution of the post-processed signal to interference and noise ratio (SINR) using large dimensional random matrix theory without the limiting condition that the channel vectors between users orthogonalize in the large-scale MIMO system in contrast to previous work. Then modeling the practical 2-D UDN topology, we analyze which factors affect the capacity of large-scale MIMO MACs in UDNs. Finally, simulation results verify our analytical results and demonstrate a comparison on the capacity between three user equipment (UE) distribution models.
{"title":"On the capacity of large-scale MIMO multiple access channels with linear receivers in UDNs","authors":"Bin Wang, Yang Sun, Xinmiao Liu, Yongyu Chang, Dacheng Yang","doi":"10.1109/PIMRC.2015.7343428","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343428","url":null,"abstract":"In this article, we investigate the capacity of large-scale multiple-input multiple-output (MIMO) multiple access channels (MACs) with linear receivers in ultra dense networks (UDNs) where the number of antennas at the base station and the number of total interfering terminals approach to infinity while maintaining a fixed ratio. To study the multicell uplink capacity of a large-scale MIMO system, we first find the probability distribution of the post-processed signal to interference and noise ratio (SINR) using large dimensional random matrix theory without the limiting condition that the channel vectors between users orthogonalize in the large-scale MIMO system in contrast to previous work. Then modeling the practical 2-D UDN topology, we analyze which factors affect the capacity of large-scale MIMO MACs in UDNs. Finally, simulation results verify our analytical results and demonstrate a comparison on the capacity between three user equipment (UE) distribution models.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127881936","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343564
Jianwei Liu, Wei Guan, Jiang Wu, Zhen Tian, Wanlin Li
In this paper, we investigate the power allocation for energy efficiency (EE) maximization in distributed antenna systems (DAS) constrained by the hybrid minimum rate requirement. The optimization problem to maximize EE is non-convex. However, an equivalent convex optimization problem can be obtained from the original non-convex optimization problem using nonlinear fractional programming. Due to the convexity of the transformational problem, the solution gap approaches to zero when compared with its dual problem. Consequently, an iterative power allocation algorithm can be derived by solving the Karush-Kuhn-Tucker conditions of the dual problem. Simulation results demonstrate that the EE performance of the proposed algorithm outperforms rate adaptive power allocation scheme.
{"title":"Power allocation for energy efficiency maximization in DAS with hybrid rate constraint","authors":"Jianwei Liu, Wei Guan, Jiang Wu, Zhen Tian, Wanlin Li","doi":"10.1109/PIMRC.2015.7343564","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343564","url":null,"abstract":"In this paper, we investigate the power allocation for energy efficiency (EE) maximization in distributed antenna systems (DAS) constrained by the hybrid minimum rate requirement. The optimization problem to maximize EE is non-convex. However, an equivalent convex optimization problem can be obtained from the original non-convex optimization problem using nonlinear fractional programming. Due to the convexity of the transformational problem, the solution gap approaches to zero when compared with its dual problem. Consequently, an iterative power allocation algorithm can be derived by solving the Karush-Kuhn-Tucker conditions of the dual problem. Simulation results demonstrate that the EE performance of the proposed algorithm outperforms rate adaptive power allocation scheme.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"534 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131658481","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343340
Yanbin Yao, Yongtao Su, Jinglin Shi, Jiangnan Lin
High-order QAM modulation schemes are recommended in various communication systems. However, soft demodulating a high-order QAM constellation is complicated when applying traditional methods. In this paper, a novel de-mapper is proposed based on the fact that the clipped LLR can also offer sufficient soft-information, meanwhile the theoretical LLR curves are approximately linear in this clipped range. Hence a first-order linear function is designed to approximate the theoretical value. Simulation results and complexity analysis demonstrate that the proposed de-mapper outperforms traditional approaches in terms of BER performance, and also keeps low complexity.
{"title":"A low-complexity soft QAM de-mapper based on first-order linear approximation","authors":"Yanbin Yao, Yongtao Su, Jinglin Shi, Jiangnan Lin","doi":"10.1109/PIMRC.2015.7343340","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343340","url":null,"abstract":"High-order QAM modulation schemes are recommended in various communication systems. However, soft demodulating a high-order QAM constellation is complicated when applying traditional methods. In this paper, a novel de-mapper is proposed based on the fact that the clipped LLR can also offer sufficient soft-information, meanwhile the theoretical LLR curves are approximately linear in this clipped range. Hence a first-order linear function is designed to approximate the theoretical value. Simulation results and complexity analysis demonstrate that the proposed de-mapper outperforms traditional approaches in terms of BER performance, and also keeps low complexity.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125703410","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343678
Piergiuseppe Di Marco, Roman Chirikov, Parth Amin, Francesco Militano
In this paper, a coverage analysis of Bluetooth Low Energy (BLE) and IEEE 802.11ah technologies for indoor scenarios is performed. This is of particular relevance when these technologies are deployed as part of capillary networks. The physical layer parameters of BLE and IEEE 802.11ah are modeled, together with a detailed and accurate indoor propagation scenario that accounts for wall losses, ray tracing multi-path, and diffractions. A real case office building scenario is considered for practical evaluation. The minimum density of BLE central devices and IEEE 802.11ah access points that guarantees a predetermined coverage level is derived and compared between the two technologies. It is shown that BLE requires five times the number of central devices than IEEE 802.11ah access points to guarantee 95% coverage. IEEE 802.11ah benefits from the use of lower frequency band, higher transmit power and better receiver sensitivity than BLE, which permits a low cost and effective deployment of Internet of Things applications. Mesh capabilities and range extension for BLE are therefore essential for the success of BLE within the Internet of Things framework.
{"title":"Coverage analysis of Bluetooth low energy and IEEE 802.11ah for office scenario","authors":"Piergiuseppe Di Marco, Roman Chirikov, Parth Amin, Francesco Militano","doi":"10.1109/PIMRC.2015.7343678","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343678","url":null,"abstract":"In this paper, a coverage analysis of Bluetooth Low Energy (BLE) and IEEE 802.11ah technologies for indoor scenarios is performed. This is of particular relevance when these technologies are deployed as part of capillary networks. The physical layer parameters of BLE and IEEE 802.11ah are modeled, together with a detailed and accurate indoor propagation scenario that accounts for wall losses, ray tracing multi-path, and diffractions. A real case office building scenario is considered for practical evaluation. The minimum density of BLE central devices and IEEE 802.11ah access points that guarantees a predetermined coverage level is derived and compared between the two technologies. It is shown that BLE requires five times the number of central devices than IEEE 802.11ah access points to guarantee 95% coverage. IEEE 802.11ah benefits from the use of lower frequency band, higher transmit power and better receiver sensitivity than BLE, which permits a low cost and effective deployment of Internet of Things applications. Mesh capabilities and range extension for BLE are therefore essential for the success of BLE within the Internet of Things framework.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121652309","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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