摘要
有关欠采样技术,文献[1]等并不考虑输入信号的有关信息。这必然会引起在采样率附近不能正确估计和处理。本文提出在前端以高速模数转换器(ADC)采样以完整保留信息,然后粗估计一个频率后进行均匀欠采样抽取,在欠采样率与ADC采样率非整数倍下,提出了线性内插方法并比较了其他内插方法与运算量。为克服欠采样所带来的信噪比恶化,本文提出了一种有效的滤波器结构。使输入信号在信噪比降低下仍能正确保留有用信息。
About subsampling, the message of input signal was not considered in reference[1].
This will cause incorrect estimation of frequenay and processing the signal near the sampling rate.
This paper proposes an efficient procedure.in the front end a high speed Analog-Digital-Converter
(ADC) is used to reserve the message completely,then a frequency is estimated in order to do uni
form subsampling. When the sampling rate fs of ADC is not the integer times of the subsampling
rate fs1 ,a linear interplating method is pointed out to reduced the complexity of computation, this
procedure is better than other processing method. An efficient FIR filter structure is proposed to
surpress the degradation of SNR(Signal to noise ratio)which is the result of subsampling.
出处
《通信学报》
EI
CSCD
北大核心
1999年第S1期236-241,共6页
Journal on Communications
基金
电子部预研基金资助项目
关键词
带通信号
均匀欠采样
FIR滤波器
内插
信噪比
bandpass signal, uniform subsampling,FIR filter, interpolation, signal to noise ratio
