2014 IEEE Global Communications Conference最新文献_第4页

Hardware calibration of the modulated wideband converter 调制宽带变换器的硬件标定

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7036931

E. Israeli, Shahar Tsiper, Deborah Cohen, Eli Shoshan, R. Hilgendorf, Alex Reysenson, Yonina C. Eldar

{"title":"Hardware calibration of the modulated wideband converter","authors":"E. Israeli, Shahar Tsiper, Deborah Cohen, Eli Shoshan, R. Hilgendorf, Alex Reysenson, Yonina C. Eldar","doi":"10.1109/GLOCOM.2014.7036931","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7036931","url":null,"abstract":"In the context of Cognitive Radio (CR), opportunistic transmissions can exploit temporarily vacant spectral bands. Efficient and reliable spectrum sensing is key in the CR process. CR receivers traditionally deal with wideband signals with high Nyquist rates and low Signal to Noise Ratios (SNRs). Sub-Nyquist sampling of such signals has been proposed for efficient sampling in CRs. The modulated wideband converter (MWC) is an example of such a sampling scheme. It is composed of an analog front-end, that aliases the signal intentionally before sampling it at a low rate. The signal can then be digitally reconstructed from the low rate samples, using the known relation between the samples and the original signal. Unfortunately, in real hardware implementation, this relation becomes unknown. Physical effects have a considerable impact on the sampling process, and as a consequence, the signal cannot be reliably recovered. In this paper, we present an efficient automated calibration algorithm that builds the actual transfer function of the system, without any prior knowledge. We then present a new, MWC based, CR prototype, on which the calibration algorithm was tested. Experiments on our hardware prototype, based on an embedded proprietary card, show that our calibrated transfer function leads to signal reconstruction whereas the theoretical one fails. Our specification complies with CR requirements of the IEEE standard 802.22 and was experimentally verified with different modulations. It vastly improves a previous prototype in terms of bandwidth, higher maximal frequency and coping with lower SNR.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"162 3 1","pages":"948-953"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84288537","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: 27

Joint uplink and downlink cell selection in cognitive small cell heterogeneous networks 认知小蜂窝异构网络中的联合上行和下行小区选择

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037206

A. Mesodiakaki, F. Adelantado, L. Alonso, C. Verikoukis

{"title":"Joint uplink and downlink cell selection in cognitive small cell heterogeneous networks","authors":"A. Mesodiakaki, F. Adelantado, L. Alonso, C. Verikoukis","doi":"10.1109/GLOCOM.2014.7037206","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037206","url":null,"abstract":"In the next few years, small cells (SCs) are expected to be densely deployed to achieve sustainable capacity enhancement. Due to the high SC density, some SCs will not have a direct connection to the core network, and thus will forward their traffic to their neighboring SCs through a multi-hop backhaul (BH). In such multi-hop architectures, the user association problem becomes challenging with BH energy consumption playing a key role. In parallel, the ever-increasing need to minimize the user equipment (UE) transmission power along with the uplink (UL) and downlink (DL) traffic asymmetry, predicate the joint study of UL and DL. Thus, in this paper, we study the joint UL and DL cell selection problem aiming at maximizing the total network energy efficiency, without compromising the UE quality of service. The problem is formulated as an optimization problem, which is NP-hard. Therefore, we propose a heuristic context-aware algorithm that associates the UEs in an energy-efficient way, while considering both access and BH energy consumption in UL and DL. We evaluate the proposed algorithm performance and we show that it can achieve significantly higher energy efficiency than the reference approaches, while maintaining high spectral efficiency and low UE power consumption.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"22 1","pages":"2643-2648"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84343145","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: 12

The effect of different levels of side information on the ergodic capacity in cognitive radio networks 不同程度的侧信息对认知无线电网络遍历能力的影响

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7036954

Mohammad Robat Mili, K. Hamdi

引用次数: 3

Joint downlink and uplink resource allocation for energy-efficient carrier aggregation 联合上下行资源分配，实现高能效载波聚合

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037468

Guanding Yu, Qimei Chen, Rui Yin, Huazi Zhang, Geoffrey Y. Li

引用次数: 33

Bandwidth efficient multi-level MPPM encoding decoding algorithms for joint brightness-rate control in VLC systems 用于VLC系统联合亮度控制的带宽高效多级MPPM编解码算法

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037125

A. Siddique, Muhammad Tahir

引用次数: 9

Method of simultaneous transmission to coherent and non-coherent receivers using ternary sequences 使用三元序列向相干和非相干接收机同时传输的方法

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037415

S. Jos, Thejaswi P. S. Chandrashekhar, Kiran Bynam, Young-Jun Hong, Changsoon Park, Manoj Choudhary

{"title":"Method of simultaneous transmission to coherent and non-coherent receivers using ternary sequences","authors":"S. Jos, Thejaswi P. S. Chandrashekhar, Kiran Bynam, Young-Jun Hong, Changsoon Park, Manoj Choudhary","doi":"10.1109/GLOCOM.2014.7037415","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037415","url":null,"abstract":"In this paper, we explore a method for simultaneous tranmission to coherent and non-coherent receivers, based on ternary sequences. In many communication scenarios, the transmitters are required to support both coherent and non-coherent forms of reception thereby requiring the transmission protocols to be designed such that the transmitted data is decoded reliably at both coherent and non-coherent receivers. Further, in such scenarios, for practical purposes, the transmitter is assumed to be agnostic to the type of the intended receiver, making the design more challenging. Thus motivated, we propose a transmission mechanism for simultaneous reception by coherent and noncoherent receivers. This transmission is enabled by ternary codes, i.e., codes over the ternary alphabet: {-1, 0, +1}. The design of these ternary codes, which exhibit good correlation properties for both coherent and non-coherent reception is a major contribution of this paper. Simulation results show that the proposed codes provide almost similar performance as the optimal codes meant for the respective receiver types.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"515 1","pages":"3892-3896"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77091920","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

Efficient data collection for wireless rechargeable sensor clusters in Harsh terrains using UAVs 利用无人机在恶劣地形下进行无线可充电传感器集群的高效数据收集

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7036813

Yawei Pang, Yanru Zhang, Yunan Gu, M. Pan, Zhu Han, Pan Li

{"title":"Efficient data collection for wireless rechargeable sensor clusters in Harsh terrains using UAVs","authors":"Yawei Pang, Yanru Zhang, Yunan Gu, M. Pan, Zhu Han, Pan Li","doi":"10.1109/GLOCOM.2014.7036813","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7036813","url":null,"abstract":"Numerous applications of wireless sensor networks (WSNs) in harsh terrains are constrained by the sensors' battery-power and face the difficulties of data collection. In this paper, we propose to exploit wireless power transfer technology to replenish the energy of sensor clusters and develop an efficient data collection scheme for those wireless rechargeable senor clusters deployed in harsh terrains. In view of the harsh terrains, we employ unmanned aerial vehicles (UAVs) to travel to the sites of sensor clusters, collect data, and recharge the sensors in corresponding clusters. With joint consideration of data collection characteristics, wireless power transfer features and travel time, we mathematically formulate the data collection in rechargeable WSNs into an optimization problem with the objective of maximizing data collection utility. Based on the matching theory, we also develop a one side matching algorithm and a greedy algorithm to solve the problem in distributed manner. Through simulations, we show that UAVs are not always matched with nearest sensor clusters, the solution of the proposed greedy algorithm is optimal, and the sensed data can be efficiently collected.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"28 1","pages":"234-239"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82036116","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: 66

IISRA: Inter-cell interference separation-based resource allocation for VoLTE 基于小区间干扰分离的VoLTE资源分配

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037515

Byungkab Jo, Taejun Park, Wonbo Lee, B. Ryu, Sunghyun Choi

引用次数: 1

Compressive sleeping wireless sensor networks with active node selection 具有主动节点选择的压缩睡眠无线传感器网络

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7036776

Wei Chen, I. Wassell

引用次数: 9

Interference-aware dual-hop cooperative relaying in a poisson field of interferers 泊松干扰场中干扰感知双跳协同中继

2014 IEEE Global Communications Conference Pub Date : 2014-12-01 DOI: 10.1109/GLOCOM.2014.7037457

W. Lu, M. Renzo

{"title":"Interference-aware dual-hop cooperative relaying in a poisson field of interferers","authors":"W. Lu, M. Renzo","doi":"10.1109/GLOCOM.2014.7037457","DOIUrl":"https://doi.org/10.1109/GLOCOM.2014.7037457","url":null,"abstract":"In this paper, we study amplify-and-forward dual-hop cooperative relaying protocols in the presence of Rayleigh fading, additive noise at the relay, as well as additive noise and symmetric alpha-stable interference at the destination. A quasi-static interference scenario is considered, which arises, e.g., when the same interferers are active during broadcast and relaying phases. At the destination, a maximal ratio combining demodulator is developed and studied, by assuming that the aggregate interference can be estimated, i.e., interference-aware design. A closed-form expression of the end-to-end moment generating function is provided and the achievable diversity order is studied. Two main results emerge from the paper: 1) if the ratio of the transmit-powers of cooperative and interfering networks is a constant, the diversity order is equal to 1 and 2) if the transmit-power of the interfering network is a constant, the diversity order is equal to 1 + 1/bI, where bI > 1 is the amplitude path-loss exponent. In the latter case, thus, second-order diversity is achieved asymptotically, as the amplitude path-loss exponent tends to one. Mathematical frameworks and findings are validated with the aid of Monte Carlo simulations.","PeriodicalId":6492,"journal":{"name":"2014 IEEE Global Communications Conference","volume":"69 1","pages":"4143-4149"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84173493","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