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International Conference on Wireless communications, Networking and Applications (WCNA)

作者： Wu, Tao Liu, Ying Liu, Yan-Du Acad Equipment Dept Photoelect Equipment Beijing Peoples R China Univ Chinese Acad Sci Sch Comp & Control Beijing Peoples R China Chinese Acad Sci Key Lab Big Data Min & Knowledge Management Beijing Peoples R China Acad Equipment Dept Grad Management Beijing Peoples R China

ISBN: (纸本)9781450353441

Cloud computing has become a popular high performance computing model where resources are provided as services over the Web(1). Users are starting to adopt the cloud model in communication applications. However, due to the complexity of parallel/cloud computing, it is difficult for average users to express a parallel computing paradigm for their applications in cloud. In order to isolate users from the complexity of parallel/cloud programming, a middleware to enable high performance communication system simulation, called HC-Midware, is proposed. It hides the details of MapReduce programming from users by automatically launching mappers through a set of user programming APIs. Directive-based parallelization scheme automatically "translates" a serial program into a SMP or Multi-core based parallel program. Heterogeneous computing resources can be invoked to conduct parallel execution by API-based scheme which highlights the adaptability of HC-Midware. A two-step scheduling scheme is proposed to maximize the throughput of the cloud system. We evaluate HC-Midware by executing three representative communication system simulation applications in a private cloud. Good scalability and adaptability were observed in the experimental results.

关键词： Cloud Computing Parallel Computing communication system simulation

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\Performance evaluation of GPS receiver under equatorial scintillation

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JOURNAL OF AEROSPACE TECHNOLOGY AND MANAGEMENT 2009年第2期1卷 193-200页

作者： Moraes, Alison de Oliveira Perrella, Waldecir Joao Inst Aeronaut & Space Sao Jose Dos Campos Brazil Technol Inst Aeronaut Sao Jose Dos Campos Brazil

Equatorial scintillation is a phenomenon that occurs daily in the equatorial region after the sunset and affects radio signals that propagate through the ionosphere. Depending on the temporal and spatial situation, equatorial scintillation can represent a problem in the availability and precision of the Global Positioning system (GPS). This work is concerned with evaluating the impact of equatorial scintillation on the performance of GPS receivers. First, the morphology and statistical model of equatorial scintillation is briefly presented. A numerical model that generates synthetic scintillation data to simulate the effects of equatorial scintillation is presented. An overview of the main theoretical principles on GPS receivers is presented. The analytical models that describe the effects of scintillation at receiver level are presented and compared with numerical simulations using a radio software receiver and synthetic data. The results achieved by simulation agreed quite well with those predicted by the analytical models. The only exception is for links with extreme levels of scintillation and when weak signals are received.

关键词： Component tracking performance GPS receiver Ionospheric scintillation communication system simulation

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