Achievable Degrees of Freedom of the K-user MISO Broadcast Channel with Alternating CSIT via Interference Creation-Resurrection

摘要

Channel state information at the transmitter affects the degrees of freedomof the wireless networks. In this paper, we analyze the DoF for the K-usermultiple-input single-output (MISO) broadcast channel (BC) with synergisticalternating channel state information at the transmitter (CSIT). Specifically,the CSIT of each user alternates between three states, namely, perfect CSIT(P), delayed CSIT (D) and no CSIT (N) among different time slots. For theK-user MISO BC, we show that the total achievable degrees of freedom (DoF) aregiven by $\frac{K^{2}}{2K-1}$ through utilizing the synergistic benefits ofCSIT patterns. We compare the achievable DoF with results reported previouslyin the literature in the case of delayed CSIT and hybrid CSIT models.