This paper considers a Multiple-Input Multiple-Output (MIMO) system with P transmitting\nand R receiving antennas and different overall noise characteristics on the different receiver antennas\n(e.g., due to nonlinear effects at the receiver side). Each communication link employs a Single-Carrier\nwith Frequency-Domain Equalization (SC-FDE) modulation scheme, and the receiver is based on\nrobust iterative frequency-domain multi-user detectors based on the Iterative Block Decision Feedback\nEqualization (IB-DFE) concept. We present low complexity efficient receivers that can employ low\nresolution Analog-to-Digital Converters (ADCs) and require the inversion of matrices with reduced\ndimension when the number of receive antennas is larger than the number of independent data\nstreams. The advantages of the proposed techniques are particularly high for highly unbalanced\nMIMO systems, such as in the uplink of Base Station (BS) cooperation systems that aim for\nSingle-Frequency Network (SFN) operation or massive MIMO systems with much more antennas at\nthe receiver side.
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