2012 IEEE International Conference on Communications (ICC)最新文献_第9页

Novel power control algorithm by decomposed Geometric Programming method for CDMA cognitive radio networks 基于分解几何规划的CDMA认知无线网络功率控制新算法

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6364110

Mohamed Elalem

{"title":"Novel power control algorithm by decomposed Geometric Programming method for CDMA cognitive radio networks","authors":"Mohamed Elalem","doi":"10.1109/ICC.2012.6364110","DOIUrl":"https://doi.org/10.1109/ICC.2012.6364110","url":null,"abstract":"Traditionally, the frequency spectrum is licensed to users in a rigid manner where the licensee has the exclusive right to access the allocated band. However, an unlicensed (cognitive) user may share a frequency band with a licensed (primary) owner as long as the interference is below a certain threshold. This makes power control a critical important issue in these networks. In this paper, we consider a decentralized power control algorithm that satisfies the most two significant metrics in cognitive radio network, capacity of cognitive network and total interference to primary users. The problem might be formulated as a power optimization problem, where rate allocation and power control are modeled through the objective function in which each user utility depends not only on its variables but also on the variables of other user utilities. Geometric Programming (GP) Problem is used to convert nonconvex optimization problem to convex optimization problem by introducing auxiliary variables and adding extra equality constraints, thus transferring the coupling in the objective to coupling in the constraints, which can be decoupled by primal-dual decomposition method, then can be efficiently solved even with a large number of users. The benefits of the method are illustrated through numerical results.","PeriodicalId":331080,"journal":{"name":"2012 IEEE International Conference on Communications (ICC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122829367","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

Analog Digital Belief Propagation: From theory to practice 模拟数字信念传播:从理论到实践

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6364282

G. Montorsi

引用次数: 5

Multiuser communication based on the discrete fractional fourier transform 基于离散分数傅里叶变换的多用户通信

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6363895

Juliano B. Lima, R. Souza, Daniel C. Cunha

引用次数: 4

Adaptive decision-feedback equalization of MIMO channels using coordinate descent iterations 基于坐标下降迭代的MIMO信道自适应决策反馈均衡

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6363638

R. Arablouei, K. Doğançay

引用次数: 1

Relaying over multiple slots with causal CSI: Optimal power allocation for energy minimization 具有因果CSI的多个插槽中继:能量最小化的最佳功率分配

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6363774

Chin Keong Ho, P. Tan, Sumei Sun

引用次数: 0

Optimized laser beam parameters for communications in space environments in the presence of pointing errors 针对存在指向误差的空间环境下的通信，优化了激光光束参数

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6364144

Chandana Tatineni, Javier Perez-Ramirez, D. Borah, D. Voelz

引用次数: 0

New results on maximal ratio combining in Nakagami-m fading channels Nakagami-m衰落信道中最大比值组合的新结果

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6363647

Young Gil Kim, N. Beaulieu

{"title":"New results on maximal ratio combining in Nakagami-m fading channels","authors":"Young Gil Kim, N. Beaulieu","doi":"10.1109/ICC.2012.6363647","DOIUrl":"https://doi.org/10.1109/ICC.2012.6363647","url":null,"abstract":"Novel expressions for the symbol error probability (SEP) of maximal ratio combining (MRC) diversity detection are derived. The case of independent and identically distributed Nakagami-m fading channels is considered. It is shown that expressions for the SEPs of MRC diversity operating in Nakagami-m fading channels can be obtained by both replacing the diversity order, L, with mL and replacing the average signal-to-noise ratio (SNR) per bit, γ̅ with γ̅/m in expressions for the SEPs of MRC diversity in Rayleigh fading channels. An identity which states that the bit error probability (BEP) of L-branch soft-decision MRC detection equals that of (2L - 1)-branch hard-decision detection with majority logic combining, both in independent Rayleigh fading channels and with equal branch SNRs, is recalled. The identity is used to derive new expressions for the SEP of MRC diversity in Nakagami-m fading channels. It is also shown that outage probability and average level-crossing rate for MRC reception in Nakagami-m fading channels can be obtained from corresponding outage probability and average level-crossing rate for MRC reception in Rayleigh fading channels. The relationships established will find application both in deriving solutions to unsolved problems and, where past solutions exist, in finding simpler solutions.","PeriodicalId":331080,"journal":{"name":"2012 IEEE International Conference on Communications (ICC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122204828","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

Traffic provisioning in a Future Internet 未来互联网的流量调配

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6364692

T. Szymanski, S. Behdin

{"title":"Traffic provisioning in a Future Internet","authors":"T. Szymanski, S. Behdin","doi":"10.1109/ICC.2012.6364692","DOIUrl":"https://doi.org/10.1109/ICC.2012.6364692","url":null,"abstract":"An adaptive traffic estimation algorithm for an Autonomic Future Internet which can provide improved throughput, energy-efficiency and QoS guarantees is proposed. The theory for a Future Internet which supports multiple service classes, i.e., the traditional Best-Effort (BE) class and a new Essentially-Perfect-QoS (QoS) class, has recently been proposed. In this Future Internet, the routers give preference to the QoS traffic class. All smoothened end-to-end traffic flows in the QoS class will never experience congestion and can achieve Essentially Perfect link-utilizations and end-to-end QoS guarantees, with significantly improved energy-efficiencies. Each Future Internet router must provision bandwidth for the QoS traffic class, and schedule this class with 100% throughput efficiency and strict QoS guarantees, using a recently-proposed mathematical scheduling algorithm. In this paper, adaptive traffic estimation algorithms which allow each Future Internet router to estimate its future QoS traffic demands and provision bandwidth for the QoS demands in anticipation of their arrival are proposed. An Autonomic Controller (AC) in each router maintains a history of its QoS and Best-Effort traffic demands over a long time horizon. Several variations of Autoregressive Integrated Moving Average (ARIMA) filters are used to estimate the future traffic demands. The AC can then provision resources for the QoS demands in anticipation of their arrival. To test the algorithms, real traffic measurements taken every 15 minutes over 4 months for a European backbone network are used. The estimates are shown to be very accurate, provisioning bandwidth for the QoS class with success rates between 93% ... 99%. An Autonomic Controller (AC) in each router can also be used to automate the bandwidth provisioning process for existing Differentiated-Services traffic classes in existing Best-Effort Internet routers.","PeriodicalId":331080,"journal":{"name":"2012 IEEE International Conference on Communications (ICC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116676122","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

MAC protocol identification approach for implement smart cognitive radio 实现智能认知无线电的MAC协议识别方法

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6364881

Sanqing Hu, Yu-dong Yao, Zhuo Yang

{"title":"MAC protocol identification approach for implement smart cognitive radio","authors":"Sanqing Hu, Yu-dong Yao, Zhuo Yang","doi":"10.1109/ICC.2012.6364881","DOIUrl":"https://doi.org/10.1109/ICC.2012.6364881","url":null,"abstract":"Cognitive radio (CR) is regarded as a solution to address the spectrum scarcity issue in wireless communications. In CR, an unlicensed network user is enabled to dynamically/adaptively access the frequency channels according to the current state of the radio environment and, therefore, CR refers to a smart radio as defined in an “observe-learn-decision” cognitive cycle. In this paper, we consider the medium access control (MAC) protocols as radio parameters in the cognitive cycle, and propose a new approach called MAC protocol identification to implement smart cognitive MAC. The MAC protocol identification approach enables CR users to sense and identify the network MAC protocol types. The identification results will be used by CR users to adaptively change their transmission parameters in order to improve the spectrum hole utilization efficiency, save energy, minimize the interference to the primary users, as well as facilitate communications among heterogeneous CR networks. To verify that the MAC protocol identification is feasible, we propose a MAC identification process based on machine learning techniques in this paper, and some experimental results are presented.","PeriodicalId":331080,"journal":{"name":"2012 IEEE International Conference on Communications (ICC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117279999","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: 49

Remotely monitoring and preventing the development of pressure ulcers with the aid of human digital memories 借助人类数字记忆远程监测和预防压疮的发展

2012 IEEE International Conference on Communications (ICC) Pub Date : 2012-06-10 DOI: 10.1109/ICC.2012.6364905

Chelsea Dobbins, P. Fergus, M. Merabti, D. Llewellyn-Jones

引用次数: 7