Browse > Article

A Design of Two-stage Cascaded Polyphase FIR Filters for the Sample Rate Converter  

Baek Je-In (한남대학교 정보통신공학과)
Kim Jin-Up (ETRI SDR팀)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.8C, 2006 , pp. 806-815 More about this Journal
Abstract
It is studied to design a low pass filter of the SRC(sample rate converter), which is used to change the sampling rate of digital signals such as in digital modulation and demodulation systems. The larger the conversion ratio of the sample rate becomes, the more signal processing is needed for the filter, which corresponds to the more complexity in circuit realization. Thus it is important to reduce the amount of signal processing for the case of high conversion ratio. In this paper it is presented a design method of a two-stage cascaded FIR filter, which proved to have reduced amount of signal processing in comparison with a conventional single-stage one. The reduction effect of signal processing turned out to be more noticeable for larger value of conversion ratio, for instance, giving down to 72% in complexity for the conversion ratio of 32. It has been shown that the reduction effect is dependent to specific combination of conversion ratios of the cascaded filters. So an exhaustive search has been performed in order to obtain the optimal combination for various values of the total conversion ratio. In this paper every filter is considered to be implemented in the form of a polyphase FIR filter, and its coefficients are determined by use of the Parks-McCllelan algorithm.
Keywords
sample rate converter; up/down converter; polyphase; FIR filter; multirate filter;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Jeffrey H. Reed, Software Radio : A Modern Approach to Radio Engineering, Prentice-Hall, 2002
2 T. Hentschel and G. Fettweis, 'Sample Rate Conversion for Software Radio,' IEEE Communication Magazine, pp.142-150, Aug. 2000
3 Walt Kester, Ed, Mixed-Signal and DSP Design Techniques, Analog Devices, Inc., 2003
4 조권도, 김지연, 이규대, 이승환, 신민정, 김진업, 'SDR 기술개발 동향', 한국전자통신연구원, 전자통신동향분석, 2004. 6
5 Fredric J. Harris, Multirate Signal Processing for Communication Systems, Pearson Education, 2004
6 www.sdrforurn.org