Implementation of Carrier Phase Positioning for 5G OFDM System

Recently, the need for high-precision positioning through the 5G NR mobile network is emerging. We implemented a high-precision positioning system using a carrier phase in the 5G OFDM system and investigated the results. We present PDOA to which phase is applied to TDOA, which is not affected by local clock error, and how to calculate carrier phase difference in OFDM system. How to use the subcarrier phase to solve the integer ambiguity of the carrier phase was studied. Based on this, the transmit/receive signal was designed, and the system was designed and implemented using NI USRP X310 and NI LabVIEW. Through the results of the verification experiments performed on the playground, it was confirmed that high-precision positioning using the carrier phase is possible in the 5G OFDM system.