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In this paper, the authors investigate soft interference cancellation algorithms for Vertical Bell laboratories LAyered Space-Time (V-BLAST) systems. By using Gaussian-forcing technique and fast matrix computation, they first derive a simplified version of the conventional Generalized Probabilistic Data Association (GPDA) algorithm, called the Fast Soft Interference Cancellation (FSIC) algorithm, whose complexity is only cubic in the number of transmit/receive antennas. Then, based on the FSIC algorithm, they develop an Enhanced Soft Interference Cancellation (ESIC) algorithm by making use of the properties of MIMO channels.
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