A method and a corresponding system for broadband co-frequency interference noise estimation and interference suppression are provided, which are applied to estimate interference noise for one data stream borne in an area of interference suppression. The method includes: calculating the interference noise covariance matrix estimation value for each pilot sub-carrier corresponding to the data stream according to the sent signal, the received signal over the sub-carrier and the channel coefficients estimation value of the channel used by the sub-carrier; calculating the interference noise covariance matrix estimation value for each data sub-carrier corresponding to the data stream according to the initial estimation value of the sent signal, received signal over the sub-carrier and channel coefficients estimation value of the channel used by the sub-carrier; calculating the weighted average of the interference noise covariance matrix estimation value for each the sub-carrier corresponding to the data stream, as the interference noise covariance matrix for each data sub-carrier corresponding to the data stream.
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