Method and system of preventing interference caused by image frequency

• Main Authors: TROELS STUDSGAARD NIELSEN, JAN VERSPECHT, JEAN-PIERRE TEYSSIER
• Format: Patent
• Language: Chinese; English
• Published: 11.12.2018
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

A system and method prevent interference caused by image frequencies resulting from mixing an incoming periodically modulated RF signal with multiple LO signals generated by a LO in a receiver system.The method includes determining tone frequencies of multiple tones and determining tone spacing between adjacent tones in the periodically modulated RF signal using a known period of modulation of the periodically modulated RF signal; identifying a sampling rate of an ADC of the receiver system; determining a DFT record size of samples provided by the ADC based on at least the tone spacing and the ADC sampling rate; and determining LO frequencies of the multiple LO signals based on at least the DFT record size and the ADC sampling rate, such that image frequencies created by respectively mixing the determined LO frequencies with portions of the periodically modulated RF signal avoid interfering with direct mixing components of the plurality of tones. 种系统和方法防止由将进入的周期性调制的RF信号与由接收器系统中的LO生成的多个LO信号混合而产生的镜频所导致的干扰。该方法包括