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 in the single-cell wireless networks. Based on the uniform linear array, we reformulate the signal model for channel estimation (CE) into a transform-domain (TD) representation. Then the TD filtering schemes are investigated. In particular, we propose a sequence-based filtering scheme which could achieve the asymptotically optimal noise cancelation effect in the regime of large antenna number. The overall proposed CE scheme has much lower complexity than the traditional minimum mean square error (MMSE) estimator and do not rely on channel statistical information. Simulation results validate the effectiveness of the proposed scheme.