Accurate channel estimation and wavelet-based interference estimation methods and application in downlink beamforming for LTE systems

In cellular systems, inter-cell interference is the main reason for performances degradation because of the usage of the same frequency for adjacent cells in LTE systems, which results in the error of channel estimation and poor performance of beamforming. To solve these problems, the effects of inter-cell interference under SCME channel model are studied and a new method to decrease the error of channel estimation is proposed. Besides, under some scenarios, the Daubechies wavelet is exploited to obtain the interference channel information. Simulation results show that not only the accurate desired channel information but also the interference channel information are obtained, which improve the performance of beamforming. As a result, the inter-cell interference is also significantly reduced in LTE systems.