A signal transmission method for a multiple-user multiple-input multiple-output system, comprising: sending a signal to user terminals through each antenna via preset subcarriers in a signal sending time slot ; sending a first public information signal to the user terminals through each antenna via the preset subcarriers in a public information sending time slot ; wherein a quantity of the preset subcarriers is the same as that of the antennas; wherein the multiple-user multiple-input multiple-output system comprises a 2× 2 system, the preset subcarriers corresponding to the quantity of the antennas comprises two subcarriers, the sending the signal to the user terminals through each antenna via preset subcarriers in the signal sending time slot , comprises: sending two signals U A and W A to a user terminal A through an antenna 1, and sending two other signals V A and X A to the user terminal A through an antenna 2, via two different preset subcarriers in a first signal sending time slot ; sending two signals U B and W B to a user terminal B through the antenna 1, and sending two other signals V B and X B to the user terminal B through the antenna 2, via two different preset subcarriers in a second signal sending time slot ; wherein the sending the first public information signal to the user terminals through each antenna via the preset subcarriers in the public information sending time slot , comprises: sending first public information signals L(u, v) and L(w, x) to user terminals A and B through the antenna 1, via the two different preset subcarriers in a third signal sending time slot . sending a signal to user terminals through each antenna via preset subcarriers in a signal sending time slot ; sending a first public information signal to the user terminals through each antenna via the preset subcarriers in a public information sending time slot ; wherein a quantity of the preset subcarriers is the same as that of the antennas; wherein the multiple-user multiple-input multiple-output system comprises a 2× 2 system, the preset subcarriers corresponding to the quantity of the antennas comprises two subcarriers, the sending the signal to the user terminals through each antenna via preset subcarriers in the signal sending time slot , comprises: sending two signals U A and W A to a user terminal A through an antenna 1, and sending two other signals V A and X A to the user terminal A through an antenna 2, via two different preset subcarriers in a first signal sending time slot ; sending two signals U B and W B to a user terminal B through the antenna 1, and sending two other signals V B and X B to the user terminal B through the antenna 2, via two different preset subcarriers in a second signal sending time slot ; wherein the sending the first public information signal to the user terminals through each antenna via the preset subcarriers in the public information sending time slot , comprises: sending first public information signals L(u, v) and L(w, x) to user terminals A and B through the antenna 1, via the two different preset subcarriers in a third signal sending time slot . sending two signals U A and W A to a user terminal A through an antenna 1, and sending two other signals V A and X A to the user terminal A through an antenna 2, via two different preset subcarriers in a first signal sending time slot ; sending two signals U B and W B to a user terminal B through the antenna 1, and sending two other signals V B and X B to the user terminal B through the antenna 2, via two different preset subcarriers in a second signal sending time slot ; wherein the sending the first public information signal to the user terminals through each antenna via the preset subcarriers in the public information sending time slot , comprises: sending first public information signals L(u, v) and L(w, x) to user terminals A and B through the antenna 1, via the two different preset subcarriers in a third signal sending time slot . <EOS>