| abstract |
The present disclosure provides a wireless communication method for transmitting to mobile terminals a plurality of layers of demodulation reference signals (DMRS) assigned on first slot and second slot of predetermined sub-carriers of a plurality of 5 layers of resource blocks with the same time and frequency resources, comprising steps of: multiplying the plurality of layers of DMRS selectively by one of the first and second orthogonal cover codes (OCCs), and by one of the first and second random sequences; multiplying the first and second OCCs multiplied with the second random sequence by -1 on the first slot or the second slot; and transmitting the plurality of 10 layers of resource blocks obtained to the mobile terminals. wherein, the first and second random sequences are selected from the QPSK alphabet, the first and second OCCs multiplied with the second random sequence are multiplied by -1 alternately on the first slot and second slot of the different predetermined sub-carriers, and the second random sequence on certain predetermined sub-carriers is rotated by angle θ,. According to the present disclosure, the four orthogonal DMRS are provided without additional signaling support, so the scheduling flexibility is improved at the base station side. |