5 *4.1.2. Channel estimation and spatial correlation*

6 Under consideration of channel estimation and correlation part, we investigate the 7 minimum mean square error (MMSE) GR. It takes an error of maximum likelihood (ML) 8 multiple-input multiple-output (MIMO) channel estimation and GR spatially correlation 9 into consideration in the computation of MMSE GR and log-likelihood ratio (LLR) of each 10 coded bit. Our GR analysis and investigation are based on the following statements:


22 In the present section, we derive the MMSE GR for detecting each transmitted symbol and 23 provide a method to compute the LLR of each coded bit. When compared with the detection 24 scheme discussed in [73], our simulation results show that the MMSE GR can obtain sizable 25 performance gain.
