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2012 International Symposium on Wireless Communication Systems (ISWCS)最新文献

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Subspace blind MIMO channel equalization with quadratic complexity 二次复杂度的子空间盲MIMO信道均衡
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328365
H. Gazzah, J. Delmas
{"title":"Subspace blind MIMO channel equalization with quadratic complexity","authors":"H. Gazzah, J. Delmas","doi":"10.1109/ISWCS.2012.6328365","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328365","url":null,"abstract":"An SOS-based blind equalization algorithm for the SIMO channel has recently been proposed that has an unprecedented quadratic complexity in the channel memory, compared to all existing SOS-based techniques whose complexity is cubic in this regard. In this paper, we show that this technique can be adapted to the MIMO channel and we prove that its complexity is maintained independently from the number of input/output channels. Simulation tests are reported that sustain the feasibility of this technique in practical observation conditions.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130465539","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: 1
Spatial correlation beamforming scheme for MISO channel emulation MISO信道仿真的空间相关波束形成方案
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328407
J. Gutiérrez, J. Ibáñez, Jesús R. Pêrez
{"title":"Spatial correlation beamforming scheme for MISO channel emulation","authors":"J. Gutiérrez, J. Ibáñez, Jesús R. Pêrez","doi":"10.1109/ISWCS.2012.6328407","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328407","url":null,"abstract":"Temporal and spatial correlation are inherent mobile wireless channel characteristics that determine multiple-input multiple-output (MIMO) systems performance. Wireless test beds, which are developed to assess MIMO techniques under these realistic conditions, are usually placed in indoor laboratories where wireless channels are intrinsically quasi-static. In this paper we propose a methodology for emulating multiple-input single-output (MISO) channels with arbitrary distributions as well as spatial correlation characteristics. This methodology, based on time-varying beamforming, allow us to evaluate MISO techniques in controlled channel conditions. Moreover, it has been implemented and tested over a commercial MIMO test bed.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127886638","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: 1
Amplify and forward relaying; Channel model and outage behaviour 放大和正向继电器;通道模型和中断行为
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328359
M. Molu, N. Goertz
{"title":"Amplify and forward relaying; Channel model and outage behaviour","authors":"M. Molu, N. Goertz","doi":"10.1109/ISWCS.2012.6328359","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328359","url":null,"abstract":"Characteristic of receiver output SNR associated with Source-to-Relay-to-Destination link for Amplify and forward relaying systems is studied and theoretical expressions for probability density function and cumulative distribution function are derived. Thereby, closed-form solution for outage probability of the system is derived. The analysis is then extended to a scenario where the destination combines the signals corresponding to the source and the relay transmissions using maximal ratio combining technique. The statistics of the equivalent SNR is studied and some new closed form expressions at high SNR regime are derived. The comparison of theoretical and numerical results shows that the high SNR expressions for outage probability are adequately tight in low SNR too. The performance of the AF relaying system is further investigated at low SNR regime; the results show that at low SNR regime, the relay transmission does not play role on the the performance of the overall system, therefore, spending resources (e.g. power or bandwidth) for the relay transmission is only wasting the resources whereas at high SNR regime the relay transmission provides full diversity.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126787001","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
Impact of mobility in cooperative spectrum sensing: Theory vs. simulation 移动性对协同频谱感知的影响:理论vs.仿真
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328401
L. D. Nardis, Maria-Gabriella Di Benedetto, Dimitri Tassetto, S. Bovelli, A. Akhtar, O. Holland, R. Thobaben
{"title":"Impact of mobility in cooperative spectrum sensing: Theory vs. simulation","authors":"L. D. Nardis, Maria-Gabriella Di Benedetto, Dimitri Tassetto, S. Bovelli, A. Akhtar, O. Holland, R. Thobaben","doi":"10.1109/ISWCS.2012.6328401","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328401","url":null,"abstract":"This work addresses the problem of cooperative spectrum sensing in cognitive radio networks, focusing on the impact of mobility on performance of cooperative sensing. First, a review of the most recent results on cooperative spectrum sensing is provided, resulting in the identification of measurement correlation and frame error rate in the reporting channel as the main parameters influencing the performance of cooperative sensing schemes. Next, the paper discusses the extension of the analysis to the case of mobile sensors, and determines the set of assumptions made in existing literature when taking into account mobility in sensing. The paper moves then to remove some of such assumptions, by presenting simulation results obtained in presence of realistic models for propagation in the considered area, as well as of a realistic mobility model. A comparison between theoretical derivation and simulation results shows that correlation among measurements taken by different sensors and the selected mobility model may significantly affect the sensing performance.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121415457","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: 9
Dynamic channel assignment and routing for cognitive sensor networks 认知传感器网络的动态信道分配和路由
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328335
Celimuge Wu, S. Ohzahata, Toshihiko Kato
{"title":"Dynamic channel assignment and routing for cognitive sensor networks","authors":"Celimuge Wu, S. Ohzahata, Toshihiko Kato","doi":"10.1109/ISWCS.2012.6328335","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328335","url":null,"abstract":"With the increase of the number of wireless sensing or metering devices, the collection of sensing data using wireless communication becomes an important part of many applications. Cognitive radio technology can be used to facilitate the deployment of a bandwidth efficient sensor system. In this paper, we propose a data collection and dissemination framework for cognitive radio sensor systems to fully utilize wireless resources while maintaining a reliably connected and efficient topology for each channel. In the proposed framework, each sensor node selects a channel considering primary user channel utilization and network connectivity. In this way, the data collection and dissemination can be performed with a high reliability and short delay while avoiding a harmful effect on primary users. We use computer simulations to evaluate the proposed framework.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123036123","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: 9
Minimum queue length load-balancing in planned Wireless Mesh Networks 规划无线Mesh网络的最小队列长度负载均衡
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328474
G. Capdehourat, Federico Larroca, P. Belzarena
{"title":"Minimum queue length load-balancing in planned Wireless Mesh Networks","authors":"G. Capdehourat, Federico Larroca, P. Belzarena","doi":"10.1109/ISWCS.2012.6328474","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328474","url":null,"abstract":"Wireless Mesh Networks (WMNS) have emerged in the last years as a cost-efficient alternative to traditional wired access networks. In order to fully exploit the intrinsically scarce resources WMNS possess, the use of dynamic routing has been proposed. We argue instead in favour of separating routing from forwarding (i.e. à la MPLS) and implementing a dynamic load-balancing scheme that forwards incoming packets along several pre-established paths in order to minimize a certain congestion function. In this paper, we consider a particular but very important scenario: a planned WMN where all bidirectional point-to-point links do not interfere with each other. Due to its versatility and simplicity, we use the sum over all links of the mean queue length as congestion function. A method to learn this function from measurements is presented, whereas simulations illustrate the framework.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127594048","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
Energy efficient relaying PHY-MAC strategy for LTE-advanced networks LTE-advanced网络的节能中继PHY-MAC策略
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328390
L. Mroueh, E. Vivier
{"title":"Energy efficient relaying PHY-MAC strategy for LTE-advanced networks","authors":"L. Mroueh, E. Vivier","doi":"10.1109/ISWCS.2012.6328390","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328390","url":null,"abstract":"In this paper, we propose an efficient relaying scheme for the LTE advanced networks where different relay nodes (RNs) are deployed at the edge of the cell. The proposed strategy makes use of the omnidirectional relays coverage in all the cell's sector to define a multi-region transmission configuration. The first type of region guarantees to achieve a target spectral efficiency with a threshold probability when only one transmitter is active. In the second type of region, two transmitters are simultaneously active and cooperate through a coding scheme to ensure a better quality of service at the user equipment (UE). Numerical results show that this strategy outperforms the orthogonal frame division performances in term of the spectral efficiency distribution all over the cell and the energy consumption.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127683769","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
Non-deterministic approach for hypercomplex orthogonal design (NAHOD) 超复正交设计(NAHOD)的非确定性方法
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328460
D. Schulz, Markus Hager, J. Seitz
{"title":"Non-deterministic approach for hypercomplex orthogonal design (NAHOD)","authors":"D. Schulz, Markus Hager, J. Seitz","doi":"10.1109/ISWCS.2012.6328460","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328460","url":null,"abstract":"The Alamouti scheme is a well known coding form for providing transmit diversity in wireless communication scenarios and is, for example, used in the 3G standard. The generalization of this technique using quaternions, allowing to use e.g. polarization as another signal attribute for diversity, has been discussed in several publications. However, there is still the open question how to design such coding matrices. In this paper, we present a generalized form of hypercomplex numbers used as basis for our computation allowing to generalize the notation of complex numbers and quaternions. Moreover, we will discuss the structure of generalized orthogonal designs allowing us to realize a non-deterministic approach for generating such code matrices.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128122361","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
Cooperative transmission scheme with two relay stations and phase feedback channels 具有两个中继站和相位反馈信道的协同传输方案
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328361
Bruno Fontana da Silva, Renato B. Machado, A. P. Legg
{"title":"Cooperative transmission scheme with two relay stations and phase feedback channels","authors":"Bruno Fontana da Silva, Renato B. Machado, A. P. Legg","doi":"10.1109/ISWCS.2012.6328361","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328361","url":null,"abstract":"In this paper, we propose a new transmission scheme with two relay stations and phase feedback channels between the relays and the destination node. The exploiting of a preprocessor use in the relay stations is managed to achieve a full diversity order and also an array gain at the destination node. A phase feedback investigation for the proposed scheme is presented assuming quasi-static flat Rayleigh fading channels. An analysis of the relay spatial allocation design is also performed.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132723709","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
Multiband joint detection with correlated spectral occupancy in wideband cognitive radios 宽带认知无线电中相关频谱占用的多波段联合检测
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328426
K. Hossain, Ayman Assra, B. Champagne
{"title":"Multiband joint detection with correlated spectral occupancy in wideband cognitive radios","authors":"K. Hossain, Ayman Assra, B. Champagne","doi":"10.1109/ISWCS.2012.6328426","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328426","url":null,"abstract":"Recently, a wideband spectrum sensing scheme referred to as multiband joint detection has been proposed by Quan et al., in which a set of frequency dependent detection thresholds are optimized to achieve the best trade-off between aggregate measures of opportunistic throughput and interference to primary users in cognitive radio (CR) networks. While this scheme shows significant performance gains over benchmark approaches, it employs a frequency-decoupled detector structure that is not optimal in the presence of correlation between subband occupancies, a common situation in CR applications. In this paper, we investigate how a frequency-coupled optimum linear energy combiner (OLEC) structure, recently proposed for single user scenarios, can be integrated into the above multiband joint detection framework to take further advantage of subband occupancy correlation in wideband spectrum sensing. We first analyze the performance of the single-user OLEC and derive expressions for its probabilities of false alarm and missed detection. Using these expressions, we then formulate joint optimization problems for the detection thresholds used by a bank of subband OLECs, with the aim to maximize the aggregate opportunistic throughput under interference constraints. Through numerical experiments with a Markov model of subband occupancy, we show that the use of the OLEC in wideband spectrum sensing can significantly enhance CR performance in terms of these global metrics, when compared to the decoupled multiband processing structure.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134020206","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: 1
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