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A Study on Optimum Coding Method for Correlation Processing of Radio Astronomy  

Shin, Jae-Sik (한국천문연구원)
Oh, Se-Jin (한국천문연구원)
Yeom, Jae-Hwan (한국천문연구원)
Roh, Duk-Gyoo (한국천문연구원)
Chung, Dong-Kyu (한국천문연구원)
Oh, Chung-Sik (한국천문연구원)
Hwang, Ju-Yeon (한국천문연구원)
So, Yo-Hwan (한남대학교)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.16, no.4, 2015 , pp. 139-148 More about this Journal
Abstract
In this paper, the optimum coding method is proposed by using open library in order to improve the performance of a software correlator developed for Korea-Japan Joint VLBI Correlator(KJJVC). The correlation system for VLBI observing system is generally implemented with hardware using ASIC or FPGA because the computational quantity is increased geometrically according to the participated observatory number. However, the software correlation system is recently constructed at a massive server such as a cluster using software according to the development of computing power. Since VLBI correlator implemented with hardware is able to conduct data processing with real-time or quasi real-time compared with mostly observational time, software correlation has to perform optimal data processing in coding work so as to have the same performance as that of the hardware. Therefore, in this paper, the experimental comparison was conducted by open-source based fftw library released in FFT processing stage, which is the most important part of the correlator system for performing optimum coding work in software development phase, such as general method using fftw library or methods using SSE(Streaming SIMD Extensions), shared memory, or OpenMP, and method using merged techniques listed above. Through the experimental results, the proposed optimum coding method for improving the performance of developed software correlator using fftw library, shared memory and OpenMP is effectively confirmed by reducing correlation time compared with conventional method.
Keywords
Optimum coding method; fftw; SSE; Shared memory; OpenMP; Software correlator;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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