This paper considers coordinated multi-cell multicast precoding for massive\nmultiple-input-multiple-output transmission where only statistical channel state information of\nall user terminals (UTs) in the coordinated network is known at the base stations (BSs). We adopt\nthe sum of the achievable ergodic multicast rate as the design objective. We first show the optimal\nclosed-form multicast signalling directions of each BS, which simplifies the coordinated multicast\nprecoding problem into a coordinated beam domain power allocation problem. Via invoking the\nminorization-maximization framework, we then propose an iterative power allocation algorithm with\nguaranteed convergence to a stationary point. In addition, we derive the deterministic equivalent of\nthe design objective to further reduce the optimization complexity via invoking the large-dimensional\nrandom matrix theory. Numerical results demonstrate the performance gain of the proposed\ncoordinated approach over the conventional uncoordinated approach, especially for cell-edge UTs.
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