Location Estimation Algorithm for Multiple Wave Sources Using Power Gravity Points

Mobile communication traffic is increasing yearly due to the spread of broadband services such as LTE, and the demand for the fifth generation mobile communication systems (5G) and beyond is expected to increase. For such advanced systems, more frequency bandwidth is required. Since most frequency bands have already been allocated to other existing radio systems, spectrum sharing has been attracting attention. In terms of spectrum sharing, it is necessary to avoid interference. On the other hand, since most locations of existing systems are not open, they should be estimated to define the conditions of spectrum sharing. The location estimation algorithm using power gravity points estimates the location using simple information such as location and received power of sensors, and it is therefore suitable for various and unspecified existing systems. On the other hand, in the case of multiple wave sources, since the received power should be the summation of the power from each wave source, the power gravity point is not applied. To solve this problem, in this paper, a region division algorithm based on power gravity points and its gradient is proposed. Calculating the power gravity point of every divided region (sub-region), the location of multiple wave sources is estimated. The simulation results using ray-tracing data and measurement results verify the validity of the proposed algorithm.