Iterative Receivers With Channel Estimation for Multi-User MIMO-OFDM: Complexity and Performance

A family of iterative receivers is evaluated in terms of complexity and performance for the case of an uplink Multi-User (MU) Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system. The transmission over block fading channels is considered. The analyzed class of receivers is performing channel estimation inside the iterative detection loop, which has been shown to improve estimation performance. As part of the authors' results they illustrate the ability of this type of receiver to reduce the required amount of pilot symbols.