Soft demodulation method for decoding double-antenna space division multiplexing by use of single antenna

The invention discloses a soft demodulation method for decoding double-antenna space division multiplexing by use of a single antenna. The method comprises the following steps: obtaining LTE downlink data received by a single antenna to be processed by performing sampling and filtering on air interface data; by use of single-antenna receiving data, performing channel estimation on two emission antennas Tx0 and Tx1 according to CSRs of two emission ports, wherein channel estimation values are respectively hTx0 and hTx1; according to the single-antenna receiving data and the channel estimation of the two emission ports, generating a reference constellation diagram used for decoding double-antenna space division multiplexing data by use of a single antenna; separating LTE data to be demodulated from the LTE downlink data according to cell configuration and resource distribution conditions; obtaining soft bits to be decoded by inputting the separated LTE data to be demodulated into the generated reference constel