The Experts below are selected from a list of 3567 Experts worldwide ranked by ideXlab platform
Per Enge - One of the best experts on this subject based on the ideXlab platform.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Sherman Lo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
Yuhsuan Chen - One of the best experts on this subject based on the ideXlab platform.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Sherman Lo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
Ching-kuang Shene - One of the best experts on this subject based on the ideXlab platform.
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ThreadMentor: a pedagogical tool for Multithreaded Programming
Journal on Educational Resources in Computing, 2003Co-Authors: Steve Carr, Jean Mayo, Ching-kuang SheneAbstract:ThreadMentor is a multiplatform pedagogical tool designed to ease the difficulty in teaching and learning Multithreaded Programming. It consists of a C++ class library and a visualization system. The class library supports many thread management functions and synchronization primitives in an object-oriented way, and the visualization system is activated automatically by a user program and shows the inner working of every thread and every synchronization primitive on-the-fly. Events can also be saved for playback. In this way, students will be able to visualize the dynamic behavior of a threaded program and the interaction among threads and synchronization primitives.
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Multithreaded Programming can strengthen an operating systems course
Computer Science Education, 2002Co-Authors: Ching-kuang SheneAbstract:Today, virtually all operating systems support Multithreaded Programming. In fact, threads are easier to use and more efficient than processes. This paper presents a possible way of using Multithreaded Programming to strengthen an operating systems course. More precisely, the lecture hours are divided into a theory track and a Programming track. The former concentrates on the traditional topics, while the latter consists of seven Programming assignments and one mini-project that can provide students with a comprehensive coverage of the use of Multithreaded Programming in the design of various operating system components. These assignments also serve as a vehicle for introducing interesting materials (e.g., PRAM models) that are normally not available in a typical operating systems course.
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the design of a Multithreaded Programming course and its accompanying software tools
2002Co-Authors: Ching-kuang SheneAbstract:With the continuing emergence of Multithreaded computation as a powerful vehicle for science and engineering, the need for an introduction to Multithreaded Programming for scientists and engineers is high. All popular operating systems already support Multithreaded Programming and the popular POSIX Pthreads standard has been approved. It is the right time to teach students this new technology. This paper presents the problems and difficulties we encountered and a set of comprehensive and flexible course materials for a Multithreaded Programming course for sophomore and junior students. This paper also presents the design of pedagogical tools for the students to visualize and experiment with various concepts in Multithreaded Programming. These concepts include program behavior and execution visualization, deadlock and race condition detection, and software metrics for measuring the complexity of students’ programs.
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a portable class library for teaching Multithreaded Programming
Technical Symposium on Computer Science Education, 2000Co-Authors: Steve Carr, Ching-kuang SheneAbstract:All modern operating systems support Multithreaded Programming (MTP). To ensure our students can lead the trend of computer science in the foreseeable future, we have been teaching MTP for four years [6]. Our experience shows that the paradigm shift from sequential to mnlti threaded causes students significant problems [7], such as (1) MTP requires a new mindset, (2) Multithreaded program behavior is dynamic, making debugging very difficult, (3) proper synchronization is more difficult than anticipated, and (4) Programming interfaces are usually more complex than necessary, causing students to spend time in learning the system details rather than the fundamentals.
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a visualization system for Multithreaded Programming
Technical Symposium on Computer Science Education, 2000Co-Authors: Michael Bedy, Steve Carr, Xianlong Huang, Ching-kuang SheneAbstract:Almost all modern operating systems, from Windows to Unix, support Multithreaded Programming. To make sure our students can lead the trend of computer science in the foreseeable future, we need to introduce them to this important technology. However, we have found through experience in teaching Multithreaded Programming that the paradigm shift from sequential to Multithreaded causes students significant problems, such as (1) Multithreaded program development requires a new mindset, (2) Multithreaded program behavior is dynamic, making debugging very difficult, and (3) proper synchronization is more difficult than anticipated [10, 11]. Moreover, detecting race conditions and deadlocks is more easily said than done.
Dennis M Akos - One of the best experts on this subject based on the ideXlab platform.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Sherman Lo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
David S De Lorenzo - One of the best experts on this subject based on the ideXlab platform.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Sherman Lo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
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design and implementation of real time software radio for anti interference gps waas sensors
Sensors, 2012Co-Authors: Yuhsuan Chen, Jyhching Juang, Jiwon Seo, Dennis M Akos, David S De Lorenzo, Per EngeAbstract:Adaptive antenna array processing is widely known to provide significant anti-interference capabilities within a Global Navigation Satellite Systems (GNSS) receiver. A main challenge in the quest for such receiver architecture has always been the computational/processing requirements. Even more demanding would be to try and incorporate the flexibility of the Software-Defined Radio (SDR) design philosophy in such an implementation. This paper documents a feasible approach to a real-time SDR implementation of a beam-steered GNSS receiver and validates its performance. This research implements a real-time software receiver on a widely-available x86-based multi-core microprocessor to process four-element antenna array data streams sampled with 16-bit resolution. The software receiver is capable of 12 channels all-in-view Controlled Reception Pattern Antenna (CRPA) array processing capable of rejecting multiple interferers. Single Instruction Multiple Data (SIMD) instructions assembly coding and Multithreaded Programming, the key to such an implementation to reduce computational complexity, are fully documented within the paper. In conventional antenna array systems, receivers use the geometry of antennas and cable lengths known in advance. The documented CRPA implementation is architected to operate without extensive set-up and pre-calibration and leverages Space-Time Adaptive Processing (STAP) to provide adaptation in both the frequency and space domains. The validation component of the paper demonstrates that the developed software receiver operates in real time with live Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) L1 C/A code signal. Further, interference rejection capabilities of the implementation are also demonstrated using multiple synthetic interferers which are added to the live data stream.
