Downlink transmission method based on MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) time domain feedback

The invention discloses a downlink transmission method based on MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) time domain feedback, comprising the following steps: feeding back a time domain tap delay line model parameters measured by a user to a base station (alternatively only feeding back path parameters with high power), obtaining frequency domain channel matrixes on all sub-carrier waves by the base station by using the parameters, and constructing the corresponding beam vectors for downlink transmission. As the number of the time domain parameters has no concern with the number of bandwidth and sub-carrier waves, the downlink transmission method based on MIMO-OFDM time domain feedback can effectively reduce the system feedback cost when the number of the bandwidth and the sub-carrier waves is very great; and meanwhile, the invention provides a feedback bite allocation method. The downlink transmission method based on MIMO-OFDM time domain feedback can effectively