Multi-user data transmission system and method using the same

The multi-user determine how the data sending / receiving system and the mode is disclosed. Multi-user data transmission / reception system of the present invention by using the received pilot signal is the preferred mode, the precoding matrix (precoding matrix) mobile (one or more mobile stations to be transmitted to generate the index, the beamforming vector index and the quantized capacity level station ) and the preferred mode, the pre-coding matrix index, the beamforming vector index and receives the quantized dose levels, expected by each quantization interval capacity (expected capacity) is using a lookup table stored in the optimum precoding matrix, the optimum from the mobile station It characterized in that it includes a base station (base station) for determining the beamforming vector and the best mode. Multi-user precoding matrix, a beamforming vector, capacity level quantization