Efficient transform-domain channel estimation technique for large-scale multiple antenna systems

This paper addresses the problem that how to estimate the channel practically for the large-scale multiple antenna systems. Based on the uniform linear array, we reformulate the signal model for channel estimation into a transform-domain (TD) representation. Then the TD filtering schemes are investigated. In particular, we propose a sequence-based filtering scheme, which is asymptotically optimal in the sense of noise cancelation as the antenna number grows large. The channel estimation scheme here we proposed has much lower complexity than the traditional minimum mean square error (MMSE) estimator and does not depend on channel statistical information. Simulation results validate the effectiveness of the proposed scheme.