差值量化椭圆球面波脉冲产生系统设计

doi:10.3969/j.issn.0255-8297.2013.04.007

Journal of Applied Sciences ›› 2013, Vol. 31 ›› Issue (4): 375-380.doi: 10.3969/j.issn.0255-8297.2013.04.007

• Signal and Information Processing • Previous Articles Next Articles

Design of PSWF Pulse Generator Based on Difference Quantitation

LIU Chuan-hui1, WANG Hong-xing1,2, ZHANG Lei1, LIU Xi-guo1

1. Department of Electronic and Information Engineering, Naval Aeronautical and
Astronautical University, Yantai 264001, Shandong Province, China
2. Key Laboratory on Signal and Information Processing of Shandong
Province, Yantai 264001, Shandong Province, China

Received:2011-08-19 Revised:2012-02-29 Online:2013-07-27 Published:2012-02-29

Abstract

Abstract: To get higher accuracy of prolate spheroidal wave function (PSWF) pulse generator and reduce quantization bits, quantization error in the traditional PSWF generator based on direct digital waveform synthesis (DDWS) is analyzed. The main factors that affect quantization accuracy are listed. A design method for
PSWF pulse generator based on difference quantitation is proposed. The method uses difference quantitation rather than direct quantization and modifies the DAC module. Theoretical analysis and simulation show that,as the over sampling rate (OSR) is greater than p, difference quantitation can improve the noise spectrum.When OSR is doubled, the noise spectrum is improved by 6 dB, as compared to 3 dB of direct quantitation.The difference quantitation method has higher quantitation accuracy with the same or even less number of quantitation bits. Therefore, PSWF pulse generator based on the difference quantitation is more suitable for high-precision PSWF signal generation with high sampling rate.

Key words: direct digital waveform synthesis (DDWS), prolate spheroidal wave function (PSWF), pulse generator, quantitation error, difference quantitation

CLC Number:

TN911.72

LIU Chuan-hui1, WANG Hong-xing1,2, ZHANG Lei1, LIU Xi-guo1. Design of PSWF Pulse Generator Based on Difference Quantitation[J]. Journal of Applied Sciences, 2013, 31(4): 375-380.

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Design of PSWF Pulse Generator Based on Difference Quantitation

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