Robust Frequency-Domain Equalization for Single-Carrier Broadband MIMO Systems

Single-carrier frequency-domain equalization (SCFDE) with multi-input multi-output (MIMO) has been recognized as an alternative technology to orthogonal frequency-division multiplexing (OFDM) MIMO for broadband wireless communication systems, especially for the uplink transmission. Conventional studies focused on the FDE design with the assumption of perfect channel estimation. In this paper, we investigate the robust SC-FDE design for MIMO systems with imperfect channel estimation. Based on a statistical model for channel estimation, we derive the optimal equalization coefficients for the robust FDE with parallel interference cancellation and successive interference cancellation (SIC). We also propose a sub-optimal ordering algorithm for the SC-FDE scheme with SIC. Numerical results show that the proposed robust FDE MIMO schemes achieve 1.5dB similar to 3dB gains in signal-to-noise ratio over the conventional non-robust FDE MIMO schemes.