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Therefore, in this proposal, in addition to the self-interference canceling method mentioned earlier, Null Beamforming to Self is proposed as a self-interference canceling method that extended the block diagonalization of MU-MIMO.
In this method, as shown by the red circle in the figure, effective isolation between the transmitting antenna and the receiving antenna is achieved by adding a circuit with extended block diagonalization to a part of the transmitting circuit of the wireless communication system.
In other words, self-interference can be canceled.
However, with this method alone, a part of the degree of freedom of transmission is used for self-interference cancellation, so there is a problem that the degree of freedom that can be used for actual transmission is greatly reduced.
As a method to solve this, the proposed method suppresses the decrease in the degree of freedom and realizes more efficient wireless communication by further applying cooperative MIMO, which communicates with multiple access points in a coordinated manner. |
IEEE/ICACT20210238 Slide.05
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