摘要
椭圆球面波函数(PSWF)特性优良,是极具前途的非正弦函数。由于幅度量化及数模转换器(DAC)输入位数有限,在基于直接数字波形合成的PSWF脉冲产生系统中,量化误差不可避免。给出该产生系统误差模型,重点针对量化误差问题,从随机信号分析的角度分析了PSWF脉冲产生系统中影响幅度量化误差大小的主要因素,通过仿真定量分析了量化误差对所产生PSWF脉冲时域波形、频谱及互相关特性和频域能量聚集性等重要特性的影响。理论分析和仿真结果表明:产生系统采用高于4倍的过采样率和大于12 bit的量化即可有效降低量化误差对产生PSWF信号性能的影响。所得结论对工程应用研究具有一定参考价值。
Prolate spheroidal wave functions(PSWFs) are very promising non- sinusoidal functions with excellent features. Due to the limitation bits of amplitude quantization and digital to anologue converter(DAC), the quantization error in the PSWF pulse generator based on direct digital waveform synthesis(DDWS) is inevitable. This paper gives the system's holistic error model, places emphasis on the problem of quantization error, analyses the impacts of the system's quantization error from the perspective of random signal analysis. Theoretical analysis and simulation results show that using over- sampling rate more than 4 times and quantization bits greater than 12 bits can effectively reduce the quantization error of generated PSWF. The conclusions has some value for the engineering and study as references.
出处
《电讯技术》
北大核心
2012年第1期5-12,共8页
Telecommunication Engineering
基金
国家自然科学基金资助项目(60772056)
山东省"泰山学者"建设工程专项经费资助项目~~
关键词
椭圆球面波函数
量化误差分析
直接数字波形合成
spheroidal wave function(PSWF)
quantitation error analysis
direct digital waveform synthesis(DDWS )