Eigenmode transmission in multiple-input multipleoutput (MIMO) systems is examined under space division duplexing (SDD). The antennas of each full-duplex node are partitioned to form two antenna banks -one for transmission, the other for reception. Self-interference is suppressed by utilizing the nullspace (or the left nullspace) of corresponding self-interference channel for transmission (or reception). Simulation results are provided on the error performance. Useful insights are obtained on how finite computational precision and quantization errors affect the feasibility of SDD.Index Terms-MIMO, space division duplexing, eigenmode transmission, null space
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