The degrees of freedom (DoF) of the 3-user multiple input multiple output interference channel (3-user MIMO IC) are investigated where there is delayed channel state information at the transmitters (dCSIT). We generalize the ideas of Maleki et al. about Retrospective Interference Alignment (RIA) to be applied to the MIMO IC, where transmitters and receivers are equipped with (M, N) antennas, respectively. We propose a two-phase transmission scheme where the number of slots per phase and number of transmitted symbols are optimized by solving a maximization problem. Finally, we review the existing achievable DoF results in the literature as a function of the ratio between transmitting and receiving antennas ¿ = M/N. The proposed scheme improves all other strategies when ¿ (1/2, 31/32].
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机译：在发送器（dCSIT）处存在延迟的信道状态信息的情况下，研究了3用户多输入多输出干扰信道（3用户MIMO IC）的自由度（DoF）。我们概括了Maleki等人的观点。关于要应用于MIMO IC的追溯干扰对准（RIA）的研究，MIMO IC的发射器和接收器分别配备有（M，N）个天线。我们提出了一种两相传输方案，其中通过解决最大化问题来优化每相的时隙数和传输符号的数量。最后，我们回顾了文献中现有的可实现的DoF结果，该结果是发射天线与接收天线之间的比率（= M / N）的函数。当??（1/2，31/32]时，提出的方案改进了所有其他策略。
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