Downlink Channel Estimation for Multi-cell Block Transmission Systems with Cyclic Prefix

This paper investigates downlink channel estimation schemes for multi-cell block transmission systems with cyclic prefix and proposes a time domain channel estimation scheme using iterative least square interference cancellation. The proposed scheme takes advantage of the fact that each received pilot signal exists in up to the length of the cyclic prefix pulse one dimensional subspace in the fast Fourier transform (FFT) size dimensional received signal vector space. Computer simulation results show that the proposed scheme can achieve almost the same channel estimation accuracy in multi-cell scenario as that in single-cell environment with small number of iterations.