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

应用科学学报 ›› 2013, Vol. 31 ›› Issue (4): 375-380.doi: 10.3969/j.issn.0255-8297.2013.04.007

差值量化椭圆球面波脉冲产生系统设计

刘传辉1，王红星1,2，张磊1，刘锡国1

1. 海军航空工程学院电子信息工程系，山东烟台264001
2. 山东省信号与信息处理重点实验室，山东烟台264001

收稿日期:2011-08-19 修回日期:2012-02-29 出版日期:2013-07-27 发布日期:2012-02-29
通信作者: 刘传辉，博士生，研究方向：现代通信新技术、非正弦波通信理论及应用，E-mail: lchgfy@163.com
作者简介:刘传辉，博士生，研究方向：现代通信新技术、非正弦波通信理论及应用，E-mail: lchgfy@163.com；王红星，教授，博导，研究方向：现代通信新技术、非正弦波通信、无线光通信理论与技术，E-mail: 13371368601@189.cn
基金资助:
国家自然科学基金（No.60772056）；山东省“泰山学者”建设工程专项经费（No.631081）资助

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

摘要/Abstract

摘要： 为提高量化精度，降低量化存储空间需求，分析了直接数字波形合成椭圆球面波函数（prolate spheroidal wave function, PSWF）脉冲产生系统的幅度量化误差，指出了影响量化精度的主要因素，进而提出一种差值量化PSWF脉冲产生系统的改进设计方案. 该方案对采样幅度差值进行量化存储，代替采样幅度直接量化存储的方法，并对数模转换模块进行改进. 理论分析和仿真实验表明：当过采样率大于p时，采用差值量化代替直接量化有助于改善量化噪声功率谱. 过采样率每提高1倍，可使量化噪声功率谱改善6 dB，优于直接量化方式3 dB. 同样的量化位数情况下可获得更高的量化精度，在相同量化精度要求下可有效降低存储空间需求. 差值量化PSWF脉冲产生系统更适合于高采样率、高精度的PSWF信号产生.

关键词: 直接数字波形合成, 椭圆球面波函数, 脉冲产生, 量化误差, 差值量化

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

中图分类号:

TN911.72

刘传辉1，王红星1,2，张磊1，刘锡国1. 差值量化椭圆球面波脉冲产生系统设计[J]. 应用科学学报, 2013, 31(4): 375-380.

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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差值量化椭圆球面波脉冲产生系统设计

Design of PSWF Pulse Generator Based on Difference Quantitation

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