Based on spatial multiplexing downlink MIMO-OFDM systems

a new Integrated Quantified limited feedback precoding scheme

including both quantified power distribution and quantified spatial multiplexing matrix of sub-carriers

is proposed in order to reduce the feedback bits and improving channel capacity. And the power distribution coefficients is modified. Design a low complexity non-uniform codebook quantitative methods of power allocation coefficients. The limited bits of both quantified matrix and quantified power information in part subcarriers are feedbacked to transmitter. Using an improved interpolation algorithm

the transmitter reconstructs original the optimal matrix. Simulation shows that the proposed system have improved the system capacity performance and reduced the bit error rate.