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In this paper, we propose an opportunistic downlink interference alignment (ODIA) for interference-limited cellular downlink, which intelligently combines user scheduling and downlink IA techniques. The proposed ODIA not only efficiently reduces the effect of inter-cell interference from other-cell base stations (BSs) but also eliminates intra-cell interference among spatial streams in the same cell...
We establish the degrees of freedom of the X-channel with delayed channel knowledge at transmitters (i.e., delayed CSIT), assuming linear coding strategies at the transmitters. We derive a new upper bound and characterize the linear degrees of freedom of this network to be 6/5. The converse builds upon our development of a general lemma for wireless networks consisting of two transmitters and two...
We investigate the total degrees of freedom (DoF) of the K-user rank-deficient interference channel with feedback. We focus on a symmetric case in which each node has the same number of antennas, the rank of each direct link is the same, and the rank of each cross link is the same. In this paper, we develop a new achievable scheme which employs interference alignment to efficiently utilize the dimension...
We characterize the total degrees of freedom (DoF) of the two-user rank-deficient interference channel with feedback, in which transmitter i and receiver j use Mi and Nj antennas, respectively, and the rank of the channel matrix between transmitter i and receiver j is given by Dji ≤ min(Mi, Nj) ∀i, j = 1,2. One consequence of this result is that feedback can increase the DoF when the number of antennas...
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