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2015 International Symposium on Wireless Communication Systems (ISWCS)最新文献

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MIMO linear precoder design with non-ideal transmitters 非理想发射机的MIMO线性预编码器设计
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454435
Ayça Özçelikkale, T. McKelvey, M. Viberg
{"title":"MIMO linear precoder design with non-ideal transmitters","authors":"Ayça Özçelikkale, T. McKelvey, M. Viberg","doi":"10.1109/ISWCS.2015.7454435","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454435","url":null,"abstract":"We investigate the linear precoder design problem for multiple-input multiple-output (MIMO) channels under non-ideal transmitter hardware. We consider two different non-ideal hardware models: i) an additive noise model in which the level of the noise at an antenna is proportional to the signal power at that antenna, ii) an additive precoder error model. We focus on the problem of minimizing mean-square error at the receiver under transmit power constraints at the transmitter. For the first hardware impairment model, this scenario leads to a non-convex formulation for which we propose a block-coordinate descent technique. The proposed method has a convergence guarantee and provides rank-constrained solutions. For the second model, analytical expressions for the optimum designs are provided. We compare the performance of our hardware impairment aware designs with that of designs developed with ideal hardware assumptions. Our results suggest that significant gains can be obtained by the proposed designs for sufficiently high signal-to-noise ratio values.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124094909","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}
引用次数: 0
Compact dual-band frequency agile antenna designed for carrier aggregation LTE small cell 专为载波聚合LTE小蜂窝设计的紧凑型双频敏捷天线
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454391
C. Jouanlanne, C. Delaveaud
{"title":"Compact dual-band frequency agile antenna designed for carrier aggregation LTE small cell","authors":"C. Jouanlanne, C. Delaveaud","doi":"10.1109/ISWCS.2015.7454391","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454391","url":null,"abstract":"This paper deals with a highly integrated frequency agile antenna design optimized for a specific LTE small cell base station using Carrier Aggregation (CA) technique for network capacity improvement. A novel compact dual access LTE antenna system is proposed combining a LTE band 7 antenna and a LTE band 20 antenna. This antenna system is composed of a regular microstrip patch antenna for LTE band 7 and a more complex dual band frequency agile folded microstrip patch antenna for LTE band 20. Available CA modes have driven the antenna design towards the frequency agile volume optimized antenna solution presented in this work. It only covers the required instantaneous bandwidth while standard static antennas would require a wider bandwidth and therefore a larger volume to be compatible with all CA modes.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126867521","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}
引用次数: 2
Analytical test statistic distributions of the MMME eigenvalue-based detector for spectrum sensing 基于MMME特征值的光谱传感检测器的分析检验统计量分布
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454393
Martijn Arts, Andreas Bollig, R. Mathar
{"title":"Analytical test statistic distributions of the MMME eigenvalue-based detector for spectrum sensing","authors":"Martijn Arts, Andreas Bollig, R. Mathar","doi":"10.1109/ISWCS.2015.7454393","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454393","url":null,"abstract":"We present an analytical derivation of the probability density functions (PDFs) of the maximum-minus-minimum eigenvalue (MMME) detector for the special case of two cooperating secondary users (SUs) in a spectrum sensing scenario. For this we employ a simple additive white Gaussian noise (AWGN) model, where in general K cooperating SUs are monitoring the wireless spectrum to determine the presence of a single primary user, which transmits phase shift keying (PSK) modulated signals. The sample covariance matrix is aWishart matrix under both the noise only and the signal plus noise hypothesis under this model. For K = 2, we derive the exact PDFs for the MMME detector under both hypotheses for a finite number of samples N taken. Then, we compare the performance of the MMME detector and the maximum-minimum eigenvalue (MME) detector aided by exact PDFs available in the literature for this model. Finally, we analyze the noise power uncertainty tolerance margin of the MMME detector under which it shows superior performance to the MME detector.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128934798","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}
引用次数: 4
Exposure assessment of smartphones and tablets 智能手机和平板电脑的暴露评估
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454380
Carla Oliveira, M. Mackowiak, L. Correia
{"title":"Exposure assessment of smartphones and tablets","authors":"Carla Oliveira, M. Mackowiak, L. Correia","doi":"10.1109/ISWCS.2015.7454380","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454380","url":null,"abstract":"This work assesses the uplink exposure of 3G/4G smartphones and tablets, as representative of current wireless usage trends. Numerical simulations are carried out to estimate SAR on whole body heterogeneous voxel models of an adult and a child, in standing and sitting postures, in a testbed comprising 16 scenarios, which is the main novelty of the work. The head and the hand absorb about 55% and 40% of the energy, respectively, during a voice call (on average), while using a tablet, on average, 96% of the energy is absorbed by the hands. The child model exhibits a higher sensitivity to frequency and to the body posture.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116698052","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}
引用次数: 5
Energy Harvesting communication system with SOC-dependent energy storage losses 具有soc相关储能损失的能量收集通信系统
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454373
Alessandro Biason, M. Zorzi
{"title":"Energy Harvesting communication system with SOC-dependent energy storage losses","authors":"Alessandro Biason, M. Zorzi","doi":"10.1109/ISWCS.2015.7454373","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454373","url":null,"abstract":"The popularity of Energy Harvesting Devices (EHDs) has grown in the past few years, thanks to their capability of prolonging the network lifetime. In reality, EHDs are affected by several inefficiencies, e.g., energy leakage, battery degradation or storage losses. In this work we consider an energy harvesting transmitter with storage inefficiencies. In particular, we assume that when new energy has to be stored in the battery, part of this is wasted and the losses depend upon the current state of charge of the device. This is a practical realistic assumption, e.g., for a capacitor, that changes the structure of the optimal transmission policy. We analyze the throughput maximization problem with a dynamic programming approach and prove that, given the battery status and the channel gain, the optimal transmission policy is deterministic. We derive numerical results for the energy losses in a capacitor and show the presence of a loop effect that degrades the system performance if the optimal policy is not considered.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131036222","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}
引用次数: 4
Improved uplink I/Q-signal forwarding for cloud-based radio access networks with millimeter wave fronthaul 改进了基于云的毫米波前传无线接入网络的上行I/ q信号转发
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454359
J. Bartelt, L. Landau, G. Fettweis
{"title":"Improved uplink I/Q-signal forwarding for cloud-based radio access networks with millimeter wave fronthaul","authors":"J. Bartelt, L. Landau, G. Fettweis","doi":"10.1109/ISWCS.2015.7454359","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454359","url":null,"abstract":"Cloud-based radio access networks, which utilize a centralized baseband unit, require additional fronthaul links as compared to conventional networks. While fiber is commonly used for these fronthaul links, millimeter wave technology offers a cost-effective alternative on the “last mile” of the network. However, millimeter wave technology has to deal with the increased attenuation of outdoor wireless channels, which poses additional challenges on the design of such links. In this work, we combine an optimized quantizer with an improved detection scheme to increase the performance of the uplink in networks utilizing millimeter wave fronthaul technology.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131433562","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}
引用次数: 4
Achievable decode and forward rates for the 3-node relay channel considering different energy constraints and synchronization errors 考虑不同能量约束和同步误差的3节点中继信道可实现的译码和转发速率
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454363
D. Kern, V. Kühn
{"title":"Achievable decode and forward rates for the 3-node relay channel considering different energy constraints and synchronization errors","authors":"D. Kern, V. Kühn","doi":"10.1109/ISWCS.2015.7454363","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454363","url":null,"abstract":"The 3-node relay channel is a well investigated subject in literature combining broadcast channel and Multiple Access (MAC) channel. Due to practical relevance, half-duplex relays are considered. Regarding the MAC, non-orthogonal channel access and orthogonal access, where the source is only active in the broadcast phase, will be distinguished. The emphasis of this paper lies on the achievable Decode and Forward (DF) rates subject to different energy constraints exploiting the degrees of freedom available for power and time allocation. These degrees of freedom are influenced by practical constraints, e.g. , whether source and relay have a local or common power supply. Furthermore, this work takes imperfect synchronization of source and relay into account. It will be shown that orthogonal channel access will approach the maximum achievable DF rate for relay positions close to the destination as well as that distributed Beamforming (dBF) in the presence of phase deviations is still valuable.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128372736","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}
引用次数: 0
Network-coded secondary communication with opportunistic energy harvesting 网络编码的二次通信与机会能量收集
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454358
G. Moritz, S. Mafra, J. L. Rebelatto, R. Souza, B. Filho, Yonghui Li
{"title":"Network-coded secondary communication with opportunistic energy harvesting","authors":"G. Moritz, S. Mafra, J. L. Rebelatto, R. Souza, B. Filho, Yonghui Li","doi":"10.1109/ISWCS.2015.7454358","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454358","url":null,"abstract":"We consider a cognitive wireless network with two energy-constrained secondary users (SUs) and a common secondary destination, where the SUs harvest energy from the transmitted signals of primary user (PU). We obtain closed-form approximations for the outage probability, the outage capacity and the optimum energy harvesting time of the proposed scheme. The analytical derivations are validated by numerical results.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"61 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131830569","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}
引用次数: 3
Implementation, validation and application of the 3GPP 3D MIMO channel model in open source simulation tools 3GPP 3D MIMO信道模型在开源仿真工具中的实现、验证和应用
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454444
Fjolla Ademaj, M. Taranetz, M. Rupp
{"title":"Implementation, validation and application of the 3GPP 3D MIMO channel model in open source simulation tools","authors":"Fjolla Ademaj, M. Taranetz, M. Rupp","doi":"10.1109/ISWCS.2015.7454444","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454444","url":null,"abstract":"Beamforming and Multiple Input Multiple Output (MIMO) have been identified as key technologies to meet the ever increasing capacity demands in future mobile cellular networks. So far, these features have mainly been investigated in the azimuth dimension, considering one-dimensional antenna arrays. Recently, the 3rd Generation Partnership Project has released a new 3-dimensional (3D) spatial channel model that also accounts for the elevation. It supports two-dimensional antenna arrays and enables to scrutinize concepts such as elevation beamforming and Full Dimension-Multiple Input Multiple Output. However, existing studies have mainly been carried out with commercial tools, thus largely limiting their reproducibility. This paper provides a guideline for the practical implementation of the 3D channel model into existing link- and system level simulation tools. Considering the complexity of the model itself, our main focus is on computational efficiency. We validate our approach with the Vienna LTE-A Downlink System Level Simulator and present simulation examples with various planar antenna arrays and polarization schemes.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":" 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113953205","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}
引用次数: 10
Outage analysis of q-duplex RF/FSO relaying q双工RF/FSO中继的中断分析
2015 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2015-08-01 DOI: 10.1109/ISWCS.2015.7454354
V. Jamali, D. Michalopoulos, M. Uysal, R. Schober
{"title":"Outage analysis of q-duplex RF/FSO relaying","authors":"V. Jamali, D. Michalopoulos, M. Uysal, R. Schober","doi":"10.1109/ISWCS.2015.7454354","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454354","url":null,"abstract":"In this paper, we propose and analyze a novel q-duplex radio frequency/free space optical (RF/FSO) relaying protocol for a mixed RF and hybrid RF/FSO communication system. In our scheme, several mobile users transmit their data over an RF link to a relay node (e.g. a small cell base station) and the relay forwards the information to a destination (e.g. a macro cell base station) over a hybrid RF/FSO backhaul link. The RF links are full-duplex with respect to the FSO link and half-duplex with respect to each other, i.e., either the user-relay RF link or the relay-destination RF link is active. Depending on the channel statistics, the q-duplex relaying protocol may reduce to full-duplex relaying, when the quality of the FSO link is sufficiently high, or to half-duplex relaying, when the FSO link becomes unavailable due to severe atmospheric conditions. We derive an analytical expression for the end-to-end outage probability of the proposed protocol when the fading for the user-relay RF link, the relay-destination RF link, and the relay-destination FSO link are modelled as Rayleigh, Ricean, and Gamma-Gamma distributed, respectively. Our simulation results confirm the analytical derivations and reveal the effectiveness of the proposed q-duplex protocol and its superiority compared to existing schemes.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122795970","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}
引用次数: 6
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