In this paper, we propose a high-performancelow-complexity data detector for frequency-selective multi-inputmulti-output (MIMO) channels. This detector applies the princi-pies of factor graph and Gaussian approximation in modeling interference. Compared to the available algorithms based on Gaussian approximation, the proposed detector goes one step further by applying an independence approximation, which re-duces the complexity significantly while incurring only a marginal performance loss. The amount of operations needed is polynomial in the number of receive antennas, the number of transmit，antennas, and the channel memory length.
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