Semi-Blind SIMO Flat-Fading Channel Estimation in Unknown Spatially Correlated Noise Using the EM Algorithm
Aleksandar Dogandzic, Wei Mo, Z. Wang · IEEE Transactions on Signal Processing · 2004
We present a maximum likelihood (ML) method for semi-blind estimation of single-input multi-output (SIMO) flat-fading channels in spatially correlated noise having unknown covariance. An expectation-maximization (EM) algorithm is utilized to compute the ML estimates of the channel and spatial noise covariance. We derive the Crame/spl acute/r-Rao bound (CRB) matrix for the unknown parameters and present a symbol detector that utilizes the EM channel estimates. Numerical simulations demonstrate the performance of the proposed method.