V. Adinarayana, K. Vasavi, T. Ravibabu, K. Muralikrishna
Abstract: To improve accuracy of the channel, this paper proposes a parametric sparse multiple input multiple output (MIMO) -OFDM channel estimation scheme based on the finite rate of innovation (FRI) theory, whereby super-resolution estimates of path delays with arbitrary values can be achieved. For outdoor communication scenarios, where wireless channels are sparse in nature, path delays of different transmit-receive antenna pairs share a common sparse pattern due to the spatial correlation of MIMO channels. Meanwhile, the channel sparse pattern is nearly unchanged during several adjacent OFDM symbols due to the temporal correlation of MIMO channels. The proposed scheme performs better than existing schemes. Furthermore, by joint processing of signals associated with different antennas, the pilot overhead can be reduced under the framework of the FRI theory. Meanwhile, both the spatial and temporal correlations of wireless MIMO channels are exploited to improve the accuracy of the channel estimation.
Keywords: MIMO-OFDM, Super-resolution, sparse channel estimation, finite rate of innovation FRI, spatial and temporal correlations