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

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Interference neutralization on relay assisted interference networks 中继辅助干扰网络的干扰中和
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328392
Z. Ho, Eduard Axel Jorswieck
{"title":"Interference neutralization on relay assisted interference networks","authors":"Z. Ho, Eduard Axel Jorswieck","doi":"10.1109/ISWCS.2012.6328392","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328392","url":null,"abstract":"In modern wireless relay-assisted networks, e.g., LTE, most of the relays are layer one relays, which are only capable of repeating but not processing the received data. In the scenario of placing a smart relay in the network, one can remodel the topology as an instantaneous relay network which is shown to achieve a higher degrees of freedom than the classical cut-set bound. Utilizing interference neutralization scheme - a well applicable technique of canceling interference signals algebraically in the air by choosing relay strategies - we demonstrate a significant improvement in terms of achievable utility region.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"104 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":"124648981","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
Generating cryptography keys using self-organizing maps 使用自组织映射生成加密密钥
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328465
H. Abdulkader, D. Roviras
{"title":"Generating cryptography keys using self-organizing maps","authors":"H. Abdulkader, D. Roviras","doi":"10.1109/ISWCS.2012.6328465","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328465","url":null,"abstract":"This paper presents a method to generate cryptography keys instead of exchange them over a public communication channel. Session keys exchange is considered as a major problem to be resolved in a communication network. When two terminals exchange data through an unsecured public channel, they use cryptography techniques to prohibit a third terminal from intercepting exchanged data. Symmetric cryptography is largely used regarding to the short time needed to execute encryption and decryption compared to asymmetric cryptography. Since the channel is unsecure to data exchange, so it is unsecure to key exchange which should be secure and the key should be changed periodically to assure a high security. Instead of exchanging session keys, we suggest a simple and secure method of key generation in the transmitter and the receiver using self organizing maps. We suggest three methods to use self-organizing maps for secret key generation. The paper shows the ability of the SOM to generate secret keys by two ways: the fake-key and the key index. Also it shows the possibility to add a mask to improve the security of keys transmission.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"29 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":"124650038","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
Compressive, collaborative spectrum sensing for wideband Cognitive Radios 宽带认知无线电的压缩协同频谱感知
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328424
Praveen K. Yenduri, A. Gilbert
{"title":"Compressive, collaborative spectrum sensing for wideband Cognitive Radios","authors":"Praveen K. Yenduri, A. Gilbert","doi":"10.1109/ISWCS.2012.6328424","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328424","url":null,"abstract":"One of the primary tasks of a Cognitive Radio (CR) is to monitor a wide spectrum and detect vacant channels for secondary transmission opportunities. However, the requirement of prohibitively high sampling rates to monitor a wideband, makes this a challenging task. In this paper, we present a novel wideband spectrum sensing model that reduces the sampling requirement to a sub-Nyquist rate, proportional to the number of occupied channels in the wideband spectrum. The sampling scheme is efficiently implementable using low-rate analog-to-digital converters (ADCs). The sensing algorithm uses techniques borrowed from theoretical computer science and compressive sampling, to detect the occupied channels with a high probability of success. The algorithm is implementable for spectrum sensing in a single CR, as well as in a decentralized CR-network with minimal communication between one-hop neighbors. We provide theoretical expressions for probability of detection and run-time requirements of the scheme. Our simulations show that the proposed scheme exhibits a performance similar to a Nyquist-rate energy detector, even with low SNR conditions and high under-sampling factors.","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":"130868327","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: 11
The broadcast of repetition coding achieves the capacity bounds of decode-and-forward 重复编码的广播实现了译码转发的容量界限
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328360
M. Shaqfeh, H. Alnuweiri
{"title":"The broadcast of repetition coding achieves the capacity bounds of decode-and-forward","authors":"M. Shaqfeh, H. Alnuweiri","doi":"10.1109/ISWCS.2012.6328360","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328360","url":null,"abstract":"In FD-AWGN relay channel, the source sends the superposition of many capacity-achieving codewords. The relay decodes them using successive interference cancellation (SIC) and sends the superposition of the same codewords multiplied by random dither sequences and with a new power distribution among the codewords. The destination node decodes all code-words by removing the dithering and then applying maximal ratio combining and SIC in the same order used at the relay. We call this scheme the broadcast of repetition coding (BRC). We demonstrate that the achievable rate by the BRC scheme increases as the number of layers of the superposition coding increases and it achieves the capacity bounds of decode-forward when the number of layers grows to infinity. The design task of the BRC scheme is to optimize the power distribution over the added layers. This is obtained by solving first-order differential equations. We propose also a different two-layer scheme based on reverse order of SIC at the destination. This scheme is practical for implementation and achieves close-to-capacity rates. Our proposed schemes provide flexible alternatives to the cooperative coding schemes over relay channels.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"9 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":"114297797","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
Enhanced frequency reuse schemes for interference management in LTE femtocell networks LTE飞蜂窝网络干扰管理的增强频率复用方案
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328383
M. M. Selim, Mostafa El-Khamy, M. El-Sharkawy
{"title":"Enhanced frequency reuse schemes for interference management in LTE femtocell networks","authors":"M. M. Selim, Mostafa El-Khamy, M. El-Sharkawy","doi":"10.1109/ISWCS.2012.6328383","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328383","url":null,"abstract":"Femtocells are low power access points that can be deployed by the consumer indoors to alleviate cellular coverage problems, offload traffic from the cellular network and boost user data rates. To enable the widespread of femtocells coexisting with macrocells, smart interference management schemes are required. Interference management by frequency allocation is still a big challenge in hybrid macro/femto cellular networks. Arbitrary frequency allocation schemes may have detrimental effects on the overall system spectral efficiency and coverage. In this paper, we propose soft and partial frequency reuse schemes for interference management in LTE femtocell networks. We analyze the system performance with various frequency allocation schemes via different metrics such as throughput, quality of service (QoS) and fairness. Simulation results show that the pro-posed soft frequency reuse (SFR) scheme with an optimized interior region radius provides an acceptable tradeoff compared to other allocation schemes.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"2016 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":"132758978","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: 23
A 9-bit 100-MS/s flash-SAR ADC without track-and-hold circuits 一个无跟踪保持电路的9位100ms /s闪存sar ADC
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328494
Young‐Kyun Cho, J. Jung, Kwangchun Lee
{"title":"A 9-bit 100-MS/s flash-SAR ADC without track-and-hold circuits","authors":"Young‐Kyun Cho, J. Jung, Kwangchun Lee","doi":"10.1109/ISWCS.2012.6328494","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328494","url":null,"abstract":"A 9-bit 100 MS/s flash-successive approximation register (SAR) analog-to-digital converter (ADC), which is suitable for wireless communication systems, is presented. To reduce the active area and power consumption, front-end track-and-hold circuits in the flash ADCs are substituted by dynamic ones. A variable delay loop for enhancing dynamic performances is also included in the ADC. The prototype was fabricated using a 45 nm complementary metal-oxide-semiconductor technology with an active area of 0.068 mm2. The differential and integral nonlinearities of the ADC are less than 0.94 and 0.66 LSB, respectively. At a 1.0 V supply and 100 MS/s, the ADC achieves a peak signal-to-noise-distortion ratio and spurious-free dynamic range of 51.94 and 65.87 dB, respectively and consumes 6.1 mW with the internal reference buffer.","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":"133030297","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: 18
Automated rational recovery selection for self-healing in mobile networks 移动网络自愈的自动理性恢复选择
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328326
Christoph Frenzel, H. Sanneck, B. Bauer
{"title":"Automated rational recovery selection for self-healing in mobile networks","authors":"Christoph Frenzel, H. Sanneck, B. Bauer","doi":"10.1109/ISWCS.2012.6328326","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328326","url":null,"abstract":"Self-healing is a key functionality of Self-Organizing Networks (SON). There have already been promising research results on Degradation Detection and Root Cause Diagnosis. However, the complex task of Recovery Selection, i.e., the determination of the best recovery action for an uncertain diagnosis of a degradation considering the operational goals of the network operator, is rarely investigated so far. In this paper, a two-step rational Recovery Selection system and its integration into a self-healing process for mobile networks is presented. Thereby, Recovery Selection first exploits technical recovery knowledge expressed in rules to determine the set of possible recovery actions for a degradation situation. Second, it determines the degree of rationality of these actions based on the operational goals of the operator. Therefore, it draws on decision theory in order to handle the uncertainty in the problem situation and the possibly conflicting preferences of the operator. The presented system enables automatic rational Recovery Selection which provides a baseline for self-healing in mobile networks.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"51 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":"133317556","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: 7
Multi-user MIMO downlink beamforming based on perturbation theory of generalized eigenvector 基于广义特征向量摄动理论的多用户MIMO下行波束形成
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328346
Heejung Yu, Jeong-Chul Shin, Sok-Kyu Lee
{"title":"Multi-user MIMO downlink beamforming based on perturbation theory of generalized eigenvector","authors":"Heejung Yu, Jeong-Chul Shin, Sok-Kyu Lee","doi":"10.1109/ISWCS.2012.6328346","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328346","url":null,"abstract":"An efficient beam updating method for multi-user multiple-input multiple-output (MU-MIMO) downlink channels is considered in time-varying channels. Previously, the beam design method based on signal-to-leakage-plus-noise ratio (SLNR) was introduced with given channel matrices. The solution maximizing SLNR is obtained by a generalized eigen-decomposition with a pair of covariance matrices of desired signal and leakage plus noise. It is burdensome to calculate directly a generalized eigenvector at each time step in time-varying channels. To reduce the computational complexity in the beam design algorithm, the perturbation theory for a generalized eigenvector without any iteration is used for a simple update formula to obtain a new generalized eigenvector corresponding to the updated channel information. Through numerical simulations, the performance of the proposed beam design algorithm is verified.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"27 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":"132375787","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
Cooperative spectrum sensing optimization under different system constraints 不同系统约束下的协同频谱感知优化
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328423
D. Panaitopol, Abdoulaye Bagayoko, Nemanja Milošević
{"title":"Cooperative spectrum sensing optimization under different system constraints","authors":"D. Panaitopol, Abdoulaye Bagayoko, Nemanja Milošević","doi":"10.1109/ISWCS.2012.6328423","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328423","url":null,"abstract":"This paper proposes three optimization solutions for hard cooperative sensing by taking into account different system constraints. Considering the global detection performance of the cooperative system, different methods for optimizing the detection are provided. These methods depend on both local and global false alarm probabilities but they also require the knowledge of individual local detection probabilities. A second part of this paper is therefore dedicated to a novel SNR prediction method, which is necessary for estimating the local detection probabilities used in the optimization process. This work clearly shows that depending on different local or global detection constraints, the result of the optimization is different.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"41 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":"129356170","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
Analysis of distributed parameter estimation in WSN with unreliable nodes 具有不可靠节点的WSN分布参数估计分析
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328341
Amanda Souza de Paula, C. Panazio
{"title":"Analysis of distributed parameter estimation in WSN with unreliable nodes","authors":"Amanda Souza de Paula, C. Panazio","doi":"10.1109/ISWCS.2012.6328341","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328341","url":null,"abstract":"In this article we analyze the diffusion normalized least mean square (NLMS) and its set-membership version (SM-NLMS) diffusion algorithms in a scenario where sensor nodes are subjected to different noise variances. We show through simulation that the SM-NLMS is a more robust algorithm in such condition, in addition to the provided reduced energy consumption. We also show that, in such context, the reduced feedback SM-NLMS (RF-SM-NLMS) presents a similar performance when compared to the SM-NLMS with an additional energy saving and lower channel occupancy. Moreover, we propose an adaptive way to choose the SM-NLMS and RF-SM-NLMS parameters in order to provide further performance enhancement in the presence of nodes subjected to different noise variances.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"11 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":"121992945","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
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