Pub Date : 2013-12-11DOI: 10.1109/PIMRC.2013.6666586
A. Salhab, S. Zummo
In this paper, we evaluate the interference effect on the performance of incremental decode-and-forward (DF) relay systems with a low-complexity relaying protocols and interference at the relays and destination. These protocols are based on the switch-and-examine diversity combining (SEC) and switch-and-examine diversity combining with post-examining selection (SECps) techniques. Based on the relaying criterion, the first checked relay whose second hop signal-to-noise ratio (SNR) satisfies a predetermined switching threshold is asked to forward the source message to destination only if the direct link is in outage. Closed-form expression is derived for the end-to-end (e2e) outage probability assuming Rayleigh fading channels. Also, the system performance is studied at high SNR regime for the two relaying protocols where the diversity order and coding gain are derived and analyzed. We assume that maximal-ratio combining (MRC) is used at the destination to combine the signal through the relay with that on the direct link. Monte-Carlo simulations are provided to validate the achieved analytical results. Findings illustrate that despite the presence of interference, the system still achieves performance gain and that the outage probability decreases when the number of relays increases, especially, in the range of SNR values that are comparable to switching threshold. Also, results show the effectiveness of the SEC and SECps relaying protocols in reducing the system complexity compared to the existing protocols as the opportunistic relaying.
{"title":"A low-complexity relaying protocols for incremental DF relay systems with co-channel interference","authors":"A. Salhab, S. Zummo","doi":"10.1109/PIMRC.2013.6666586","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666586","url":null,"abstract":"In this paper, we evaluate the interference effect on the performance of incremental decode-and-forward (DF) relay systems with a low-complexity relaying protocols and interference at the relays and destination. These protocols are based on the switch-and-examine diversity combining (SEC) and switch-and-examine diversity combining with post-examining selection (SECps) techniques. Based on the relaying criterion, the first checked relay whose second hop signal-to-noise ratio (SNR) satisfies a predetermined switching threshold is asked to forward the source message to destination only if the direct link is in outage. Closed-form expression is derived for the end-to-end (e2e) outage probability assuming Rayleigh fading channels. Also, the system performance is studied at high SNR regime for the two relaying protocols where the diversity order and coding gain are derived and analyzed. We assume that maximal-ratio combining (MRC) is used at the destination to combine the signal through the relay with that on the direct link. Monte-Carlo simulations are provided to validate the achieved analytical results. Findings illustrate that despite the presence of interference, the system still achieves performance gain and that the outage probability decreases when the number of relays increases, especially, in the range of SNR values that are comparable to switching threshold. Also, results show the effectiveness of the SEC and SECps relaying protocols in reducing the system complexity compared to the existing protocols as the opportunistic relaying.","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":"115282783","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.2013.6666714
Qing Huang, Yingmin Wang
In this paper, we study the two-way relay channel (TWRC) with multi-user (MU), each of which exchanges information with its partners via a common access relay. All users are divided into two groups. Every user exchanges messages with each user in the other group. The two communication terminals use different modulation schemes. We term this system an asymmetric multi-pair two-way relay X channel (TWRXC), in which signal space alignment for network coding (SSA-NC) and network-coding-based interference nulling beamforming are employed. Considering modulation schemes of two communication terminals are different, we propose a novel reencode function at the relay and decoding rule at the user side to realize the reliable communication. The bit error rates (BERs) of the proposed system is derived. Monte Carlo simulations show that the proposed scheme can improve system performance significantly.
{"title":"Signal space alignment for asymmetric multi-pair two-way relay X channels","authors":"Qing Huang, Yingmin Wang","doi":"10.1109/PIMRC.2013.6666714","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666714","url":null,"abstract":"In this paper, we study the two-way relay channel (TWRC) with multi-user (MU), each of which exchanges information with its partners via a common access relay. All users are divided into two groups. Every user exchanges messages with each user in the other group. The two communication terminals use different modulation schemes. We term this system an asymmetric multi-pair two-way relay X channel (TWRXC), in which signal space alignment for network coding (SSA-NC) and network-coding-based interference nulling beamforming are employed. Considering modulation schemes of two communication terminals are different, we propose a novel reencode function at the relay and decoding rule at the user side to realize the reliable communication. The bit error rates (BERs) of the proposed system is derived. Monte Carlo simulations show that the proposed scheme can improve system performance significantly.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"238 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":"126812944","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.2013.6666501
D. López-Pérez, H. Claussen, Lester T. W. Ho
Macrocellular networks with frequency reuse across sectors of the same eNodeB and neighbouring eNodeBs suffer from high interference at the cell boundaries, resulting in an uneven distribution of User Equipment (UE) throughputs. Recently, it has been shown that for two-carrier HSDPA networks a horizontal sector offset configuration for the second carrier can significantly enhance network performance at the cost of an increased number of handovers. In this paper, this sector offset configuration is extended to LTE through a novel approach, which allows deploying offset antennas in eNodeBs without significantly increasing the number of handovers. The proposed sector offset configuration is compatible with current channel dependent schedulers, and provides significant gains. Simulation results show that for LTE the proposed sector offset configuration can increase the average UE throughput and 5%-tile UE throughput by up to 22% and 32%, respectively, while slightly increasing the number of handovers compared to the traditional eNodeB configuration. Moreover, results show that the new configuration can significantly reduce the handover failure rate by up to 69%.
{"title":"Improved frequency reuse schemes with horizontal sector offset for LTE","authors":"D. López-Pérez, H. Claussen, Lester T. W. Ho","doi":"10.1109/PIMRC.2013.6666501","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666501","url":null,"abstract":"Macrocellular networks with frequency reuse across sectors of the same eNodeB and neighbouring eNodeBs suffer from high interference at the cell boundaries, resulting in an uneven distribution of User Equipment (UE) throughputs. Recently, it has been shown that for two-carrier HSDPA networks a horizontal sector offset configuration for the second carrier can significantly enhance network performance at the cost of an increased number of handovers. In this paper, this sector offset configuration is extended to LTE through a novel approach, which allows deploying offset antennas in eNodeBs without significantly increasing the number of handovers. The proposed sector offset configuration is compatible with current channel dependent schedulers, and provides significant gains. Simulation results show that for LTE the proposed sector offset configuration can increase the average UE throughput and 5%-tile UE throughput by up to 22% and 32%, respectively, while slightly increasing the number of handovers compared to the traditional eNodeB configuration. Moreover, results show that the new configuration can significantly reduce the handover failure rate by up to 69%.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"28 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":"115278151","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.2013.6666259
Lu Wei, O. Tirkkonen
Multi-antenna spectrum sensing algorithms for cognitive radio are receiving a lot of attention recently. In this paper, we consider multi-antenna detection when the noise covariance matrix is assumed to be arbitrary and unknown. The studies leading to this paper have been motivated by the existence but typically unknown noise correlation in practice. A multiple primary user detector, derived from the generalized likelihood ratio criterion, is analyzed in such a scenario. We calculate the exact moments of the test statistics involved, which lead to a simple and accurate analytical formula for the false alarm probability. The result is obtained by utilizing tools from multivariate analysis as well as moment based approximations. Simulations are conducted to examine accuracy of the derived result, with the achieved accuracy being reasonably good. From the considered simulation settings, performance gain over existing detection algorithms is observed in scenarios with arbitrary but unknown noise correlation and multiple primary users.
{"title":"Multiple primary user spectrum sensing for unknown noise statistics","authors":"Lu Wei, O. Tirkkonen","doi":"10.1109/PIMRC.2013.6666259","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666259","url":null,"abstract":"Multi-antenna spectrum sensing algorithms for cognitive radio are receiving a lot of attention recently. In this paper, we consider multi-antenna detection when the noise covariance matrix is assumed to be arbitrary and unknown. The studies leading to this paper have been motivated by the existence but typically unknown noise correlation in practice. A multiple primary user detector, derived from the generalized likelihood ratio criterion, is analyzed in such a scenario. We calculate the exact moments of the test statistics involved, which lead to a simple and accurate analytical formula for the false alarm probability. The result is obtained by utilizing tools from multivariate analysis as well as moment based approximations. Simulations are conducted to examine accuracy of the derived result, with the achieved accuracy being reasonably good. From the considered simulation settings, performance gain over existing detection algorithms is observed in scenarios with arbitrary but unknown noise correlation and multiple primary users.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"135 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":"114464467","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.2013.6666512
Mehmet Fatih Tüysüz, H. A. Mantar
In IEEE 802.11 wireless networks, periodic channel scanning is an essential procedure to discover available access points (APs) in vicinity and to achieve fast handover. However, this procedure leads to unnecessary overhead in wireless networks and also interrupts ongoing communications of stations. In this paper, we propose a smart channel scanning scheme that minimizes the communication interruptions. In the proposed scheme, periodic channel scanning is scheduled based on the predefined channel scanning intervals and activated after a successful frame transmission only if the mobile station is on move and the received signal strength indicator value (RSSI) drops below a pre-specified threshold value. Analytical and simulation results show that the proposed channel scanning scheme reduces the channel scanning overhead dramatically, minimizes communication interruptions and improves the overall throughputs of stations.
{"title":"Smart channel scanning with minimized communication interruptions over IEEE 802.11 WLANs","authors":"Mehmet Fatih Tüysüz, H. A. Mantar","doi":"10.1109/PIMRC.2013.6666512","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666512","url":null,"abstract":"In IEEE 802.11 wireless networks, periodic channel scanning is an essential procedure to discover available access points (APs) in vicinity and to achieve fast handover. However, this procedure leads to unnecessary overhead in wireless networks and also interrupts ongoing communications of stations. In this paper, we propose a smart channel scanning scheme that minimizes the communication interruptions. In the proposed scheme, periodic channel scanning is scheduled based on the predefined channel scanning intervals and activated after a successful frame transmission only if the mobile station is on move and the received signal strength indicator value (RSSI) drops below a pre-specified threshold value. Analytical and simulation results show that the proposed channel scanning scheme reduces the channel scanning overhead dramatically, minimizes communication interruptions and improves the overall throughputs of stations.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"47 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":"115050350","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.2013.6666603
Ö. Bulakci, Jyri Hämäläinen, E. Schulz
Relay deployments promise to alleviate the limitations of conventional macrocell networks, such as poor indoor penetration and coverage holes in a cost-efficient way. In this context, the capacity of the wireless relay link between a relay node (RN) and its serving base station (BS) has a crucial role in the achievable end-to-end performance. The deployment flexibility of RNs, which mainly stems from the wireless relay link, compact physical characteristics, and low-power consumption, can be exploited by relay site planning (RSP) to overcome the limitations of the relay link and, thus, enhance the system performance. To this end, RSP is carried out via selecting an RN deployment location from a discrete set of alternatives considering the signal-to-interference-plus-noise ratio (SINR) on the relay link as the selection criterion. In practice, the so-called coarse RSP takes into account only large-scale fading due to shadowing. Nevertheless, as RNs are stationary, the wireless channels pertaining to relay deployments are subject to simultaneous impairments by both shadowing and multi-path fading, i.e., composite fading/shadowing. In this paper, we present the performance of coarse RSP that can be used for planning and dimensioning of two-hop cellular relay networks in composite fading/shadowing environments, where co-channel interference is also present. The relay link is modeled by Nakagami-lognormal distribution while the access link between a mobile terminal (MT) and its serving RN is modeled by Rician-lognormal distribution. Furthermore, we provide an accurate analytical framework through closed-form expressions for relay link SINR, link rates, and end-to-end rate. Results show that coarse RSP can still yield high performance improvements considering composite fading/shadowing channels.
中继部署有望以一种经济有效的方式缓解传统宏蜂窝网络的局限性，例如室内渗透率差和覆盖漏洞。在这种情况下，中继节点(RN)与其服务基站(BS)之间的无线中继链路的容量在可实现的端到端性能中起着至关重要的作用。中继站点规划(relay site planning, RSP)可以利用RNs的部署灵活性，克服中继链路的限制，从而提高系统的性能。RNs的部署灵活性主要源于无线中继链路，物理特性紧凑，功耗低。为此，RSP通过考虑中继链路上的信噪比(SINR)作为选择标准，从一组离散的备选方案中选择RN部署位置来进行。在实践中，所谓的粗RSP只考虑由于阴影引起的大规模衰落。然而，由于RNs是静止的，与中继部署有关的无线信道同时受到阴影和多径衰落的损害，即复合衰落/阴影。在本文中，我们介绍了粗RSP的性能，该性能可用于在复合衰落/阴影环境中规划和标注两跳蜂窝中继网络，其中也存在同信道干扰。中继链路采用nakagami -对数正态分布建模，移动终端与服务终端之间的接入链路采用ririan -对数正态分布建模。此外，我们通过中继链路SINR、链路速率和端到端速率的封闭表达式提供了一个准确的分析框架。结果表明，考虑到复合衰落/阴影信道，粗RSP仍然可以获得较高的性能改进。
{"title":"Performance of coarse relay site planning in composite fading/shadowing environments","authors":"Ö. Bulakci, Jyri Hämäläinen, E. Schulz","doi":"10.1109/PIMRC.2013.6666603","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666603","url":null,"abstract":"Relay deployments promise to alleviate the limitations of conventional macrocell networks, such as poor indoor penetration and coverage holes in a cost-efficient way. In this context, the capacity of the wireless relay link between a relay node (RN) and its serving base station (BS) has a crucial role in the achievable end-to-end performance. The deployment flexibility of RNs, which mainly stems from the wireless relay link, compact physical characteristics, and low-power consumption, can be exploited by relay site planning (RSP) to overcome the limitations of the relay link and, thus, enhance the system performance. To this end, RSP is carried out via selecting an RN deployment location from a discrete set of alternatives considering the signal-to-interference-plus-noise ratio (SINR) on the relay link as the selection criterion. In practice, the so-called coarse RSP takes into account only large-scale fading due to shadowing. Nevertheless, as RNs are stationary, the wireless channels pertaining to relay deployments are subject to simultaneous impairments by both shadowing and multi-path fading, i.e., composite fading/shadowing. In this paper, we present the performance of coarse RSP that can be used for planning and dimensioning of two-hop cellular relay networks in composite fading/shadowing environments, where co-channel interference is also present. The relay link is modeled by Nakagami-lognormal distribution while the access link between a mobile terminal (MT) and its serving RN is modeled by Rician-lognormal distribution. Furthermore, we provide an accurate analytical framework through closed-form expressions for relay link SINR, link rates, and end-to-end rate. Results show that coarse RSP can still yield high performance improvements considering composite fading/shadowing channels.","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":"122772558","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.2013.6666195
K. Kaushik, Deepak Mishra, S. De, S. Basagni, W. Heinzelman, K. Chowdhury, S. Jana
Batteries of field nodes in a wireless sensor network pose an upper limit on the network lifetime. Energy harvesting and harvesting aware medium access control protocols have the potential to provide uninterrupted network operation, as they aim to replenish the lost energy so that energy neutral operation of the energy harvesting nodes can be achieved. To further improve the energy harvesting process, there is a need for novel schemes so that maximum energy is harvested in a minimum possible time. Multi-hop radio frequency (RF) energy transfer is one such solution that addresses these needs. With the optimal placement of energy relay nodes, multi-hop RF energy transfer can save energy of the source as well as time for the harvesting process. In this work we experimentally demonstrate multi-hop RF energy transfer, wherein two-hop energy transfer is shown to achieve significant energy and time savings with respect to the single-hop case. It is also shown that the gain obtained can be translated to energy transfer range extension.
{"title":"Experimental demonstration of multi-hop RF energy transfer","authors":"K. Kaushik, Deepak Mishra, S. De, S. Basagni, W. Heinzelman, K. Chowdhury, S. Jana","doi":"10.1109/PIMRC.2013.6666195","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666195","url":null,"abstract":"Batteries of field nodes in a wireless sensor network pose an upper limit on the network lifetime. Energy harvesting and harvesting aware medium access control protocols have the potential to provide uninterrupted network operation, as they aim to replenish the lost energy so that energy neutral operation of the energy harvesting nodes can be achieved. To further improve the energy harvesting process, there is a need for novel schemes so that maximum energy is harvested in a minimum possible time. Multi-hop radio frequency (RF) energy transfer is one such solution that addresses these needs. With the optimal placement of energy relay nodes, multi-hop RF energy transfer can save energy of the source as well as time for the harvesting process. In this work we experimentally demonstrate multi-hop RF energy transfer, wherein two-hop energy transfer is shown to achieve significant energy and time savings with respect to the single-hop case. It is also shown that the gain obtained can be translated to energy transfer range extension.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"286 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":"124264925","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.2013.6666625
Linhao Dong, Sumei Sun, Xu Zhu, Yeow-Khiang Chia
In this paper, we study the power consumption in relay networks of the 60 GHz wireless communication based on amplify-and-forward (AF) and decode-and-forward (DF) relaying strategies. We propose a total power consumption model including drive power, decoding power, and power consumption of power amplifier (PA). This model is formulated as a function of drive power, which gives an easy access to the system level optimisation. The optimal drive power that minimises the total power consumption while satisfying the performance requirement can be found by numerical searching method. The impact of relay's locations on the total power consumption is also investigated. We show that, with the same performance requirement, in the small source-relay separation case AF consumes less power than DF, while with larger separation, AF consumes significantly more power than DF. This is different from the common intuition that DF is always more power consuming than AF due to the extra decoding power consumption at relay, which is due to the fact that the large source-relay separation limits the effective destination signal-to-noise ratio (SNR) in AF, leading to more substantial decoding power consumption in the many more decoding iterations than DF.
{"title":"Power efficient 60 GHz wireless communication networks with relays","authors":"Linhao Dong, Sumei Sun, Xu Zhu, Yeow-Khiang Chia","doi":"10.1109/PIMRC.2013.6666625","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666625","url":null,"abstract":"In this paper, we study the power consumption in relay networks of the 60 GHz wireless communication based on amplify-and-forward (AF) and decode-and-forward (DF) relaying strategies. We propose a total power consumption model including drive power, decoding power, and power consumption of power amplifier (PA). This model is formulated as a function of drive power, which gives an easy access to the system level optimisation. The optimal drive power that minimises the total power consumption while satisfying the performance requirement can be found by numerical searching method. The impact of relay's locations on the total power consumption is also investigated. We show that, with the same performance requirement, in the small source-relay separation case AF consumes less power than DF, while with larger separation, AF consumes significantly more power than DF. This is different from the common intuition that DF is always more power consuming than AF due to the extra decoding power consumption at relay, which is due to the fact that the large source-relay separation limits the effective destination signal-to-noise ratio (SNR) in AF, leading to more substantial decoding power consumption in the many more decoding iterations than DF.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"86 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":"124783640","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.2013.6666146
Ido Nevat, G. Peters, I. Collings
We develop a novel approach to source localization in mobile wireless sensor networks. Standard approaches make explicit assumptions relating to the statistical characteristics of the physical process and propagation environments which result from distributional model assumptions in a likelihood-based inference method. In contrast, we adopt an approach known in statistics as a non-parametric modeling framework which allows one to relax the number of required statistical assumptions, specifically with regard to the distributional properties of the received signal and the physical process. This is achieved via a re-formulation of the problem as a flexible non-parametric regression model via the framework of Gaussian Processes. Coupling this modeling perspective with a Bayesian optimization mechanism, we frame the global optimization objective as a sequential decision problem. We then develop an efficient algorithm to sequentially select the optimal location at which the mobile sensor should obtain observations under communication and mobility constraints. Simulation results demonstrate the efficiency of the algorithm at achieving accurate localization in a wireless sensor network.
{"title":"Localization in mobile wireless sensor networks via sequential global optimization","authors":"Ido Nevat, G. Peters, I. Collings","doi":"10.1109/PIMRC.2013.6666146","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666146","url":null,"abstract":"We develop a novel approach to source localization in mobile wireless sensor networks. Standard approaches make explicit assumptions relating to the statistical characteristics of the physical process and propagation environments which result from distributional model assumptions in a likelihood-based inference method. In contrast, we adopt an approach known in statistics as a non-parametric modeling framework which allows one to relax the number of required statistical assumptions, specifically with regard to the distributional properties of the received signal and the physical process. This is achieved via a re-formulation of the problem as a flexible non-parametric regression model via the framework of Gaussian Processes. Coupling this modeling perspective with a Bayesian optimization mechanism, we frame the global optimization objective as a sequential decision problem. We then develop an efficient algorithm to sequentially select the optimal location at which the mobile sensor should obtain observations under communication and mobility constraints. Simulation results demonstrate the efficiency of the algorithm at achieving accurate localization in a wireless sensor network.","PeriodicalId":210993,"journal":{"name":"2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"39 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":"126095726","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.2013.6666615
H. Karimi
The UK/European framework for access to the UHF TV band by white space devices (WSDs) is predicated on the communication of information on TV white space (TVWS) availability from white space databases (WSDBs) to WSDs. This information is in the form of location- and frequency-specific maximum permitted WSD radiated power levels. These levels are calculated in such a way so as to afford protection to the two incumbent (licensed) uses within the band, namely Digital Terrestrial Television (DTT), and Programme Making and Special Events (PMSE), as well as users of spectrum outside the band. In this paper we first outline the proposed framework for access to TV white spaces in the UK, describing the interactions between the regulator, WSDBs and WSDs. We then present the calculations required for the computation of maximum permitted WSD radiated power levels, accounting for nationwide DTT coverage and PMSE assignments.
{"title":"A framework for calculation of TV white space availability subject to the protection of DTT and PMSE","authors":"H. Karimi","doi":"10.1109/PIMRC.2013.6666615","DOIUrl":"https://doi.org/10.1109/PIMRC.2013.6666615","url":null,"abstract":"The UK/European framework for access to the UHF TV band by white space devices (WSDs) is predicated on the communication of information on TV white space (TVWS) availability from white space databases (WSDBs) to WSDs. This information is in the form of location- and frequency-specific maximum permitted WSD radiated power levels. These levels are calculated in such a way so as to afford protection to the two incumbent (licensed) uses within the band, namely Digital Terrestrial Television (DTT), and Programme Making and Special Events (PMSE), as well as users of spectrum outside the band. In this paper we first outline the proposed framework for access to TV white spaces in the UK, describing the interactions between the regulator, WSDBs and WSDs. We then present the calculations required for the computation of maximum permitted WSD radiated power levels, accounting for nationwide DTT coverage and PMSE assignments.","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":"124137612","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：