Abstract
In this paper, we study the degree of freedom(DoF) for the two-cell downlink multiple-input multiple-output(MIMO) interference multiple access channel(IMAC) with the delayed channel state information at the transmitters(CSIT). We propose a two-stage interference alignment scheme(TSIA) which makes full use of both the outdated and the current CSIT to align not only the interference from the adjacent cell onto the zero space, but also the intra-cell interference onto the subspace spanned by the previously received interference signals, respectively. Based on the TSIA method, we characterize the sum DoF of the network and the result shows the significant gain compared with the traditional TDMA-ZF scheme. Furthermore, the trend of the sum rate of the network well coincides with the analysis of DoF, which verifies our work.
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