{'fraction_non_alphanumeric': 0.02219626168224299, 'fraction_numerical': 0.0, 'mean_word_length': 5.6434108527131785, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A reconfigurable Digital Down Converter architecture for multistandard GNSS receiver

This paper presents the design of a reconfigurable Digital Down Converter (DDC) for a quad standard GNSS receiver. By considering GPS, GALILEO, GLONASS and BEIDOU standard specifications, a bandpass RF sampling-based GNSS receiver is designed. After direct digitization of input signals by choosing properly the sampling frequency, an eight-path reconfigurable DDC is proposed before Digital Signal Processing (DSP) stage in order to down-convert GNSS signals to baseband, reduce sampling rates and therefore relax the processing complexity. The trends related to the implementation of a reconfigurable Direct Digital Synthesizer (DDS) as the critical component in the DDC are also addressed. The DDS implementation results show both low complexity and high performance.