Not Only Conmunication: Co-band signals used in 5G MIMO system for indoor positioning

With the development of the city, the problem of positioning in large and complex indoor environments has become increasingly prominent. In order to deal with this problem, we consider the method of improving indoor positioning by 5G micro base station with MIMO and co-band signals. In this way, we can achieve positioning in places where communication is possible in indoor scenes. First of all, we use the co-band chip synchronization technology to select the initial location area. Then, we perform precise angle measurement on the selected signal by the chip phase difference between the common frequency signal and the local signal, and the positioning points are jointly determined by a plurality of base stations. Finally, we verify the correctness of the method through simulation. The developed algorithm which combines communication and positioning can solves the problem of the increasing positioning problem caused by indoor cells. Furthermore, our method has some resistance to multipath and non-line-of-sight, which improves the positioning performance of municipal hotspots to some extent.