{'fraction_non_alphanumeric': 0.023444544634806132, 'fraction_numerical': 0.009017132551848512, 'mean_word_length': 5.306818181818182, '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}}
Channel Emulation based on 3D End-to-End MPAC Solution

As 5G commercialization speeding up, 5G wireless devices are in the stage of accelerated research, development and manufacturing. A major feature of 5G base station is the application of massive multiple input and multiple output (MIMO) technology, so the performance testing of 5G MIMO is a significant part ensuring the performance of 5G mobile networks. This paper introduces an end-to-end over-the-air (OTA) performance test system for 5G terminals in 3D scenarios, where uplink and downlink communication is realized via different OTA probes while guaranteeing the system reciprocity. Meanwhile by adopting phase modulation network, the system significantly saves the number of channel emulator radio frequency (RF) ports while guaranteeing the features of the entire gNodeB. Besides, a discretization probe weight calculation scheme for 3D OTA anechoic chamber is proposed to construct the 3D channel propagation environment. Simulation and test results show that the system can accurately be qualified for MIMO OTA end-to-end performance testing.