Quadrature Compressive Sampling for Radar Echo Signals

摘要：

Quadrature sampling is an effective technique for extracting digital in-phase and quadrature (I/Q) components in the modulated radio signals. Existing quadrature sampling techniques require the sampling rate to be at least twice of the bandwidth of the bandpass signal. The newly introduced compressive sampling theory makes sampling the analog signal at a low sampling rate possible if the signal has a sparse representation. This paper merges the two sampling techniques and develops a quadrature compressive sampling (QuadCS) system to obtain the digital I/Q components with low-rate samplers. The operation principle of the QuadCS system is described and the formulation to recover the I/Q components from the low-rate samples is developed. The simulation results demonstrate that the QuadCS is effective for acquiring and reconstructing the I/Q components sparse in waveform-matched dictionary. With the QuadCS system, the simulated signals can be sampled at about 10％ Nyquist sampling rates. In addition, the output signal-to-noise ratio is improved about 15~20dB.

关键词： Compressive sampling Quadrature sampling Sparse signal Radar echo signal

作者: Feng Xi Shengyao Chen Zhong Liu

作者单位: Department of Electronic Engineering Nanjing University of Science and Technology Nanjing, Jiangsu 2 Department of Electronic Engineering Nanjing University of Science and TechnologyNanjing, Jiangsu 21

会议类型: 国际会议

会议名称: 2011年无线通信与信号处理国际会议(WCSP 2011)

会议地点: 南京

会议语种:英文

页码: 1-5

在线出版日期: 2011-11-09（万方平台首次上网日期，不代表论文的发表时间）