Dynamic supersymbol design of blind interference alignment for K-user MISO broadcast channels

We develop a blind interference alignment (BIA) through staggered antenna switching scheme for more realistic channel assumption. Contrary to the general assumption that the coherence time of the channel is long enough to perform BIA, when the coherence time is not long enough, channel coefficients stay constant for limited block length. Therefore, we propose a dynamic supersymbol design algorithm which can construct a supersymbol with limited block length which is determined by the coherence time of the channel. We demonstrate that the supersymbol length can be reduced significantly by aligning interferences in a hierarchical manner referred to as hierarchical BIA. Furthermore, we also show that the proposed dynamic supersymbol design algorithm achieves higher degrees of freedom than the conventional method with a given coherence time.