2014 11th International Symposium on Wireless Communications Systems (ISWCS)最新文献_第4页

Modelling trust in random wireless networks 随机无线网络中的信任建模

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933495

J. Coon

{"title":"Modelling trust in random wireless networks","authors":"J. Coon","doi":"10.1109/ISWCS.2014.6933495","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933495","url":null,"abstract":"We present an analysis of the probability that a set of devices capable of communicating wirelessly can form a fully connected, trusted network. The network model that is used accounts for the geometric properties of the physical network boundaries, the statistical nature of the propagation environment, and the notion that both trustworthy and untrustworthy devices may occupy the network domain. Two local (pairwise) trust models are explored in the context of this model: proximity-based trust, where trust between two devices is a function of the distance between them, and experience-based trust, where trust is dependent upon the outcomes from prior inter-device interactions. Both models are probabilistic, a condition that is motivated by our interest in the steady state or average behaviour of the network as well as several practical applications, including sensor and device-to-device (D2D) networks for disaster relief, public safety, and peer-to-peer file sharing in 5G cellular systems. Our analysis illustrates a clear and simple mathematical relationship between the local trust probabilities and the underlying physics of the system, thus pointing to a need for trust protocols that are tailored to specific deployments.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116957634","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: 22

BER enhancements for practical interference alignment in the frequency domain 在频域实际干涉对准的误码率增强

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933317

A. Kühne, Adrian Loch, Thomas Nitsche, J. Widmer, M. Hollick, A. Klein

{"title":"BER enhancements for practical interference alignment in the frequency domain","authors":"A. Kühne, Adrian Loch, Thomas Nitsche, J. Widmer, M. Hollick, A. Klein","doi":"10.1109/ISWCS.2014.6933317","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933317","url":null,"abstract":"The K user interference alignment scheme with symbol extensions proposed by Cadambe and Jafar achieves K/2 degree of freedom in theory for high signal-to-noise ratios (SNRs). However, lower SNR ranges appear in many practical scenarios. Thus, further improvements of the Cadambe-Jafar scheme are demanded to enable interference alignment in more realistic settings. In this work, we propose a new precoding vector optimization that improves bit error rates (BER) using zero-forcing at the receivers. Furthermore, we compare and combine our approach with existing performance enhancement techniques for interference alignment such as orthonormalizing the precoding matrices or using lattice decoding instead of zero-forcing at the receiver. Finally, we implement interference alignment with symbol extension in the frequency domain along with the presented BER enhancement techniques on a software defined radio platform to validate our approaches. Both simulation results and testbed measurements show significant BER improvements for different M-QAM schemes compared to the original interference alignment mechanism. Moreover, our precoding optimization scheme based on zero-forcing outperforms lattice decoding in practical systems due to its lower sensitivity to real-world effects.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122510056","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

A quantized reliability-relay selection method for wireless cooperative communications 一种无线协同通信量化可靠性中继选择方法

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933369

Wassim Alexan, A. El-Mahdy

引用次数: 6

Learning distributed caching strategies in small cell networks 学习小蜂窝网络中的分布式缓存策略

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933484

A. Sengupta, Saidhiraj Amuru, R. Tandon, R. Buehrer, T. Clancy

{"title":"Learning distributed caching strategies in small cell networks","authors":"A. Sengupta, Saidhiraj Amuru, R. Tandon, R. Buehrer, T. Clancy","doi":"10.1109/ISWCS.2014.6933484","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933484","url":null,"abstract":"Caching has emerged as a vital tool in modern communication systems for reducing peak data rates by allowing popular files to be pre-fetched and stored locally at end users' devices. With the shift in paradigm from homogeneous cellular networks to the heterogeneous ones, the concept of data offloading to small cell base stations (sBS) has garnered significant attention. Caching at these small cell base stations has recently been proposed, where popular files are pre-fetched and stored locally in order to avoid bottlenecks in the limited capacity backhaul connection link to the core network. In this paper, we study distributed caching strategies in such a heterogeneous small cell wireless network from a reinforcement learning perspective. Using state of the art results, it can be shown that the optimal joint cache content placement in the sBSs turns out to be a NP-hard problem even when the sBS's are aware of the popularity profile of the files that are to be cached. To address this problem, we propose a coded caching framework, where the sBSs learn the popularity profile of the files (based on their demand history) via a combinatorial multi-armed bandit framework. The sBSs then pre-fetch segments of the Fountain-encoded versions of the popular files at regular intervals to serve users' requests. We show that the proposed coded caching framework can be modeled as a linear program that takes into account the network connectivity and thereby jointly designs the caching strategies. Numerical results are presented to show the benefits of the joint coded caching technique over naive decentralized cache placement strategies.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129537292","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: 133

Resource allocation for distributed beamforming with multiple relays and individual power constraints 具有多个中继和单个功率约束的分布式波束形成的资源分配

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933309

S. Schedler, V. Kühn

引用次数: 5

QoS-aware joint uplink-downlink scheduling in FDD LTE-Advanced with carrier aggregation 载波聚合FDD LTE-Advanced中qos感知联合上行下行调度

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933330

A. M. Ghaleb, E. Yaacoub, A. Abdulkafi

引用次数: 5

Relaxed synchronization support of universal filtered multi-carrier including autonomous timing advance 通用滤波多载波的宽松同步支持，包括自主时序推进

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933347

F. Schaich, T. Wild

{"title":"Relaxed synchronization support of universal filtered multi-carrier including autonomous timing advance","authors":"F. Schaich, T. Wild","doi":"10.1109/ISWCS.2014.6933347","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933347","url":null,"abstract":"5G wireless systems may benefit by waveforms supporting relaxed synchronization, as this enables reduced energy consumption, better support of low-end devices and reduction of signaling overhead. In this paper we evaluate UFMC (Universal Filtered Multi-Carrier), also known as UF-OFDM (universal filtered OFDM) - the recently appeared waveform option for 5G - with respect to its performance in scenarios with relaxed synchronization. Both carrier frequency offset, e.g. due to low-cost oscillators used in low-end devices, and relative fractional delay, e.g. due to the absence of an energy consuming closed-loop ranging mechanism, is considered. We introduce a concept called autonomous timing advance (ATA) improving the overall system performance. With ATA the system can operate purely based on open-loop synchronization. For comparing UFMC with CP-OFDM, we evaluate the mean squared error (MSE) in the receiver after frequency conversion. With applying a limit regarding the tolerable amount of distortion, we calculate the supported link distance for a system applying either UFMC or CP-OFDM for LTE-like settings. With applying UFMC, higher link distances are supported than with CP-OFDM, if the system applies open-loop synchronization.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121971615","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: 71

Hand-grip impact on range-based cooperative positioning 手握对基于距离的协同定位的影响

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933449

F. D. Rosa, T. Paakki, J. Nurmi, M. Pelosi, Gianluca Della Rosa

引用次数: 4

On the accuracy of PSD-based interference modeling of asynchronous OFDM/FBMC in spectrum coexistence context 频谱共存条件下基于psd的异步OFDM/FBMC干扰建模精度研究

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933432

Y. Medjahdi, M. Terré, D. L. Ruyet, D. Roviras

引用次数: 3

RSS-based clustering of mobile terminals for localization in wireless networks 无线网络定位中基于rss的移动终端聚类

2014 11th International Symposium on Wireless Communications Systems (ISWCS) Pub Date : 2014-10-23 DOI: 10.1109/ISWCS.2014.6933453

Hadi Noureddine, Honggang Zhang, J. Palicot

引用次数: 4