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This paper introduces a structure-based neural network architecture, namely RC-Struct, for MIMO-OFDM symbol detection. The RC-Struct exploits the temporal structure of the MIMO-OFDM signals through reservoir computing (RC). A binary classifier is built to perform the multi-class detection by leveraging the repetitive constellation structure in the communication system. The incorporation of RC allows the RC-Struct to be learned in a purely online fashion with extremely limited pilot symbols in each OFDM subframe. The binary classifier efficiently utilizes the precious online training symbols and allows an easy extension to high-order modulations without a substantial increase in complexity. The experiment demonstrates the effectiveness of RC-Struct in the MIMO-OFDM system with the dynamically adapted link. The results shed light on combining communication domain knowledge and learning-based receive …