A non-coherent long range (LoRa) communication system based on multiple-input multiple-output (MIMO) technology, including a transmitter and a receiver. The transmitter is configured to transmit signals to the receiver, and the receiver is configured to receive and demodulate the signals. The transmitter includes a bit-symbol converter, a space-time mapper, and a plurality of transmitting antennas. The space-time mapper is configured to select a transmit antenna for the signal in each transmission time slot and transmit a base Chirp signal x0 and the modulating signal xm to the receiver in different time slots. The receiver includes a plurality of receiving antennas. The receiving antenna is configured to preprocess the signal to obtain a first cache matrix and a second cache matrix. After Hadamard product operation is performed on the first and second cache matrixes, operation results of the receiving antennas are accumulated and demodulated to output demodulated information bits.