Study And Analysis Of Power Control In Cellular Networks

In wireless communications, transmission power is an important resource. Power control, also known as transmit power control, is refers to having received good quality conditions between the transmitter and receiver, and reduce the transmission power, so as to achieve the purpose of reducing interference. Power control consists of techniques and algorithms, which is used to manage and adjust the transmitted power of stations and handsets. Power control also serves several purpose, including reducing co-channel interference(CCI), managing data quality, maximizing cell capacity, minimizing handset mean transmit power, etc.This dissertation mainly study the uplink Distributed Power Control (DPC) algorithm and improved algorithms in cellular networks.In this dissertation, firstly, we introduce the Centralized Power Control (CPC) algorithm and DPC algorithm. In multi-cell communication networks, on the two aspects of the computational complexity of algorithm and channel estimate costs, DPC algorithm has the advantage over CPC algorithm, and because the multi-cell communication networks are more common in practice, DPC algorithm is mainly analyzed by simulation. Secondly, after the existing users reaching target SINR values, if there is a new user access networks by DPC algorithm, it will affect the quality of the existing active link. Therefore, a robust DPC algorithm was introduced and simulation analysis was carried out. Finally, as described above, because of the DPC algorithm cannot accurately capture time-varying channel dynamics, DPC algorithm based on Kalman filter is introduced. Through the simulation analysis found the applicability of the new algorithm under this condition.