目前的通信频点越来越高， 而相对应的模数转换器以及数字信号处理等硬
件处理技术远远没有达到高频通信接收技术的要求。 这一定程度上限制了高频
通信的发展， 因为按照传统 Nyquist 采样的话， 通信接收机的成本将是巨大的。
压缩感知(Compressed Sensing,CS)技术有效地打破了传统 Nyquist 采样的限制，
而调制宽带转换器(Modulated Wideband Converter,MWC)的出现则真正在模拟
域欠采样实现了重大突破。(The communication frequency in present is getting higher and higher, but
the corresponding hardware processing technique such as analog to digital converter
and digital signal processing are far from to meet the requirements of the high
frequency communication received equipment. This partly limits the development of
high frequency communication because the cost of communications receivers would
be great if sampling in traditional Nyquist frequency. Compressed sensing
technology breaks the limitations of traditional Nyquist sampling effectively, and the
emergence of modulated wideband converters achieves a major breakthrough in the
domain of direct under-sampling of analog signal.)