• Title/Summary/Keyword: Software Digital Filter

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A Study on the Digital Filter Design using Software for Analysis of Observation Data in Radio Astronomy (전파천문 관측데이터 분석을 위해 소프트웨어를 이용한 디지털필터 설계에 관한 연구)

  • Yeom, Jae-Hwan;Oh, Se-Jin;Roh, Duk-Gyoo;Oh, Chung-Sik;Jung, Dong-Kyu;Shin, Jae-Sik;Kim, Hyo-Ryoung;Hwang, Ju-Yeon
    • Journal of the Institute of Convergence Signal Processing
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    • v.16 no.4
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    • pp.175-181
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    • 2015
  • In this paper, we propose a design method for a digital filter using software in order to analyze the radio astronomy observation data. Recently the analysis method for radio astronomy observing system is transferring from hardware to software by developing of state-of-the-art of computer system. The existing hardware system is not able to easily change the specification because it is implemented to meet special requirements and it takes a high cost and time. In case of software, however, it has an advantage to implement with small cost if open software is used, and flexibly changes to satisfy the desired specification. But, in order to analyze the massive data like radio astronomy with software, the good performance system is needed for computer. Therefore, this paper proposes a digital filter design method using software with the same performance as that of digital filter implemented with hardware in observation system which is operated by the KVN(Korean VLBI Network). To design a digital filter, the proposed method is performed with standard C language and the simulation is conducted with GNU(GNU's Not Unix) Octave and investigated to show its effectiveness. In addition, for the high speed operation of the designed digital filter, the SSE(Streaming SIMD Extensions) library is adopted for available parallel operation. By the proposed digital filter, the digital filtering is performed for the wide band observation data in the KVN observation mode, the filtering result of narrow band observation has no ripple inside of stop band, and confirmed the effectiveness of the proposed method.

Design and Implementation of SDR-based Digital Filter Technique for Multi-Channel Systems (다중채널 시스템을 위한 SDR 기술기반의 디지털 필터 기법 설계 및 구현)

  • Yu, Bong-Guk;Bang, Young-Jo;Ra, Sung-Woong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.5A
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    • pp.494-499
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    • 2008
  • In this study, a Software Defined Radio(SDR) technology-based digital filtering technique applicable to a multiple channel processing system such as a wireless mobile communication system using Code Division Multiple Access(CDMA) technology is proposed. The technique includes a micro-processor to redesign Finite Impulse Response(FIR) filter coefficients according to specific system information and to download the filter coefficients to one digital Band Pass Filter(BPF) to reconfigure another system. The feasibility of the algorithm is verified by implementing a multiple channel signal generator that is reconfigurable to other system profiles, including those for a CDMA system and a WCDMA system on identical hardware platform.

Reconfigurable FIR Filter for Dynamic Variation of Filter Order and Filter Coefficients

  • Meher, Pramod Kumar;Park, Sang Yoon
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.16 no.3
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    • pp.261-273
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    • 2016
  • Reconfigurable finite impulse response (FIR) filters whose filter coefficients and filter order change dynamically during run-time play an important role in the software defined radio (SDR) systems, multi-channel filters, and digital up/down converters. However, there are not many reports on such reconfigurable designs which can support dynamic variation of filter order and filter coefficients. The purpose of this paper is to provide an architectural solution for the FIR filters to support run-time variation of the filter order and filter coefficients. First, two straightforward designs, namely, (i) single-MAC based design and (ii) full-parallel design are presented. For large variation of the filter order, two designs based on (iii) folded structure and (iv) fast FIR algorithm are presented. Finally, we propose (v) high throughput design which provides significant advantage in terms of hardware and/or time complexities over the other designs. We compare complexities of all the five structures, and provide the synthesis results for verification.

Design and Implementation of a SDR-based Digital Filter for CDMA Systems

  • Yu, Bong-Guk;Bang, Young-Jo;Kim, Dae-Ho;Lee, Kyu-Tae;Ra, Sung-Woong
    • Journal of Ubiquitous Convergence Technology
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    • v.2 no.2
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    • pp.59-66
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    • 2008
  • In this study, Software Defined Radio (SDR) technology-based digital filterbank architecture applicable to a multiple-channel processing system such as a wireless mobile communication system using Code Division Multiple Access (CDMA) technology is proposed. The technique includes a micro-processor to redesign Finite Impulse Response (FIR) filter coefficients according to specific system information and to download the filter coefficients to one digital Band Pass Filter (BPF) to reconfigure another system. The feasibility of the algorithm is verified by computer simulation and by implementing a multiple-channel signal generator that is reconfigurable to other system profiles, including those of a Wideband Code Division Multiple Access (WCDMA) system and a CDMA system.

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Study on Design and Implementation of the Low Pass Digital Filter for Biological Signals by a Microprocessor (마이크로프로세서에 의한 생체신호용 저역 디지털 필터의 설계 및 구현에 관한 연구)

  • Lee, Young-Wook
    • The Journal of Information Technology
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    • v.9 no.1
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    • pp.33-39
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    • 2006
  • This study is for the contents of development to the hardware system and software driving algorithm to implement the frequency band of about 7KHz los pass digital filter which has the cut-off frequency of 392Hz by interfacing of a microprocessor with its peripheral analog-to-digital converter chip and digital-to-analog converter chip. The simplicity of digital filter design without difficulty and the implementation of programmed digital filter can be realized by providing the interfacing method to implement the law pass digital filter for the biological signals and the realization method of computer algorithm by a microprocessor.

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Design of Dual-Mode Digital Down Converter for WCDMA and cdma2000

  • Kim, Mi-Yeon;Lee, Seung-Jun
    • ETRI Journal
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    • v.26 no.6
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    • pp.555-559
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    • 2004
  • We propose an efficient digital IF down converter architecture for dual-mode WCDMA/cdma2000 based on the concept of software defined radio. Multi-rate digital filters and fractional frequency conversion techniques are adopted to implement the front end of a dual-mode receiver for WCDMA and cdma2000. A sub-sampled digital IF stage was proposed to support both WCDMA and cdma2000 while lowering the sampling frequency. Use of a CIC filter and ISOP filter combined with proper arrangement of multi-rate filters and common filter blocks resulted in optimized hardware implementation of the front end block in 292k logic gates.

Digital Down Converter System improving the computational complexity (복잡도를 개선한 Digital Down Converter 시스템)

  • Moon, Ki-Tak;Hong, Moo-Hyun;Lee, Joung-Seok;Kim, Kyung-Seok
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.3
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    • pp.11-17
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    • 2010
  • Multi-standard, multi-band, multi-service system to ensure a flexible interface between the SDR (Software Defined Radio) technology for the implementation of the Stability and Low-Power, Low-Calcualrion DDC (Digital Down Conversion) technology is essential. DDC technology consists of a digital channel filter. This is a typical digital filter because of the limited fisheries are vulnerable to overflow and rounding errors are drawbacks. In this paper, we overcome this disadvantage, we propose the structure of the DDC. The way WDF (Wave Digital Filter) Structural rounding error due to the structural resistance to noise. Therefore, This is the useful structure when the filter coefficients's word length is short. In addition, since IIR filters based on FIR filters based on the amount of computation is reduced because fewer than filter's tap. The proposed structure is used in DDC that CIC (Cascaded Integrator Comb) filter, WDF, IFOP (Interpolated Fourth-Order Polynomials) were analyzed with respect to, the results were confirmed by computer simulation.

A Study on the Digital Filter Design for Radio Astronomy Using FPGA (FPGA를 이용한 전파천문용 디지털 필터 설계에 관한 기본연구)

  • Jung, Gu-Young;Roh, Duk-Gyoo;Oh, Se-Jin;Yeom, Jae-Hwan;Kang, Yong-Woo;Lee, Chang-Hoon;Chung, Hyun0Soo;Kim, Kwang-Dong
    • Journal of the Institute of Convergence Signal Processing
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    • v.9 no.1
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    • pp.62-74
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    • 2008
  • In this paper, we would like to propose the design of symmetric digital filter core in order to use in the radio astronomy. The function of FIR filter core would be designed by VHDL code required at the Data Acquisition System (DAS) of Korean VLBI Network (KVN) based on the FPGA chip of Vertex-4 SX55 model of Xilinx company. The designed digital filter has the symmetric structure to increase the effectiveness of system by sharing the digital filter coefficient. The SFFU(Symmetric FIR Filter Unit) use the parallel processing method to perform the data processing efficiently by using the constrained system clock. In this paper, therefore, for the effective design of SFFU, the Unified Synthesis software ISE Foundation and Core Generator which has excellent GUI environment were used to overall IP core synthesis and experiments. Through the synthesis results of digital filter core, we verified the resource usage is less than 40% such as Slice LUT and achieved the maximum operation frequency is more than 260MHz. We also confirmed the SFFU would be well operated without error according to the SFFU simulation result using the Modelsim 6.1a of Mentor Graphics Company. To verify the function of SFFU, we carried out the additional simulation experiments using the pseudo signal to the Matlab software. From the comparison experimental results of simulation and the designed digital FIR filter, we confirmed the FIR filter was well performed with filter's basic function. So we verified the effectiveness of the designed FIR digital filter with symmetric structure using FPGA and VHDL.

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A Study on Design and Implementation of Digital Filter (디지탈 필터의 설계 및 구현에 관한 연구)

  • Seo, Eun-Taek;Chung, C.H.
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.447-449
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    • 1993
  • Digital filter is a signal processor which converts the sequence input sampled from analog signal into another sequence output. It includes software routines which filter digital signal, a computer system for executing the routines, and a data acquisition system which implements A/D, D/A signal conversion. In this paper, a data acquisition system is designed and implemented for one-board computer of MC68000. Also, the theory regarding signal conversion and and its problems occured in implementation are considered. And then, with the hardware implemented like this, design of a digital low-pass filter with the cutoff frequency of 200Hz is implemented, and related characteristics are considered.

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Software Montage: Filtering of Detecting Target of Similar Software for Digital Forensic Investigation (소프트웨어 몽타주: 디지털 포렌식 수사를 위한 유사 소프트웨어 탐지 대상의 필터링)

  • Park, Hee-Wan;Han, Tai-Sook
    • Journal of KIISE:Computing Practices and Letters
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    • v.16 no.4
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    • pp.497-501
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    • 2010
  • A software montage means information that can be extracted quickly from software and includes inherent characteristics. If a montage is made from well-known programs, we can filter candidates of similar programs among the group of programs based on the montage. In this paper, we suggest software montages based on two characteristics: API calls and strings. To evaluate the proposed montages, we performed experiments to filter candidates of some similar programs to instant messenger programs. From the experiments, we confirmed that the proposed montages can be used as a forensic tool that filters a group of similar programs even when their functions are not known in advance.