This paper proposes a new spatio-temporal equalization method using a cascade configuration of an adaptive antenna array and a DFE (Decision Feedback Equalizer). The spatio-temporal equalizer with the cascade configuration can be realized in low computational complexity, however, the error performance surface becomes a fourth-order function of the weights, and possibly has two minima. In order to avoid wrong trap by a local minimum during the adaptation of MMSE (Minimum Mean-Squared Error) based adaptive algorithm, the proposed equalizer calculates the weights of the adaptive array and the DFE separately in two steps, and the adaptive array selects a path or paths to capture depending on channel conditions.
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