$K$ -用户MISO干扰信道中基于OFDM的盲干扰对齐
Grouping Based Blind Interference Alignment for $K$-user MISO Interference Channels
摘要：
提出了一种基于交错天线切换的盲干扰对齐算法。与信道在BIA符号扩展周期期间保持恒定的理想假设相反，当信道的相干时间相对较短时，信道系数可以在给定符号扩展周期期间改变。为了在真实信道假设下完美地执行BIA，我们针对$K$用户干扰信道提出了一种基于分组的超符号结构，该结构可以根据给定的相干时间来调整超符号长度。证明了通过适当的分组可以显著地减小超符号长度。此外，它也表明，分组为基础的超符号实现更高的自由度比传统的方法与给定的相干时间。
英文摘要：
We propose a blind interference alignment (BIA) through staggered antenna switching scheme with no ideal channel assumption. Contrary to the ideal assumption that channels remain constant during BIA symbol extension period, when the coherence time of the channel is relatively short, channel coefficients may change during a given symbol extension period. To perform BIA perfectly with realistic channel assumption, we propose a grouping based supersymbol structure for $K$-user interference channels which can adjust a supersymbol length to given coherence time. It is proved that the supersymbol length could be reduced significantly by an appropriate grouping. Furthermore, it is also shown that the grouping based supersymbol achieves higher degrees of freedom than the conventional method with given coherence time.
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