Implementation of high-performance multi-structure digital down converter based on FPGA

Digital Down Conversion(DDC) is a key technology of Software Radio. Traditional implementations consume more resources and are difficult to achieve high Signal-to-Noise Ratio(SNR) gain. To solve this problem, an optimized filter structure of DDC for acquiring high SNR gain is presented. The effect of finite word length of filter coefficients and output rounding on the performance of DDC are investigated. In the Matlab and Xilinx ISEl0.1 simulation development environment, Virtex-5 XC5VLX110T FPGA chip is used to implement a variety of different filter structure DDC design, then some critical indices such as SNR gain and resource consumption of each scheme are compared. Experimental results show that the 1000 times decimation DDC of entire-FIR-filters structure meets all the performance requirements, whose SNR gain is up to 28.0515dB, which is substantially better than that of the conventional structure.

[1]  Joseph Mitola,et al.  The software radio architecture , 1995, IEEE Commun. Mag..

[2]  Alan N. Willson,et al.  Application of filter sharpening to cascaded integrator-comb decimation filters , 1997, IEEE Trans. Signal Process..

[3]  Joseph Rothweiler,et al.  Polyphase quadrature filters-A new subband coding technique , 1983, ICASSP.

[4]  Mark Cummings,et al.  FPGA in the software radio , 1999, IEEE Commun. Mag..

[5]  Yong Hoon Lee,et al.  On the use of interpolated second-order polynomials for efficient filter design in programmable downconversion , 1999, IEEE J. Sel. Areas Commun..

[6]  Gagandeep Kaur,et al.  Multirate Digital Signal Processing for Software Defined Radio (SDR) Technology , 2008, 2008 First International Conference on Emerging Trends in Engineering and Technology.

[7]  S. Biyiksiz,et al.  Multirate digital signal processing , 1985, Proceedings of the IEEE.

[8]  P. Bauer,et al.  Asymptotic stability of digital filters with combinations of overflow and quantization nonlinearities , 1991, 1991., IEEE International Sympoisum on Circuits and Systems.