Hyperbolic position location estimator with TDOAs from four stations

This thesis presents a detailed derivation of a set of equations needed to locate the three dimensional position of a mobile given the locations of four fixed stations (like a global positioning system (GPS) satellite or a base station in a cell) and the signal time of arrival (TOA) from the mobile to each station. From these derived equations, a synthesizable VHDL model was developed and simulated using IEEE numen*c_std package. All the inputs and outputs were described by 32 bit vectors. From the simulations, it was observed that in the best case the mobile position was off by I meter and in the worst case the position was off by 36 meters. This model was synthesized with cadence tools and the total number of gates produced was 2.7 million

The MVAPICH Project: Evolution and Sustainability of an Open Source Production Quality MPI Library for HPC

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OSPRI: An Optimized One-Sided Communication Runtime for Leadership-Class Machines

Abstract—Partitioned Global Address Space (PGAS) programming models provide a convenient approach to implementing complex scienti?c applications by providing access to a large, globally accessible address space. This paper describes the design, implementation and performance of a new one-sided communication library that attempts to meet the needs of PGAS models, particularly Global Arrays, but hopefully also PGAS languages like UPC and CAF. In this work, we describe a new communication runtime for PGAS models such as GA, termed OSPRI (One-Sided PRImitives). OSPRI presents several changes in architecture from conventional one-sided communication systems that make it better suited for emerging leadersip class machines. We describe the implementation of the the IBM Blue Gene/P target for OSPRI and demonstrate signi?cant improvements in latency, bandwidth, and scalability over tuned ARMCI and GA implementations on this system. The performance and scalablity of this library validate the design choices and should provide useful insight for implementers of related communication middleware