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In this paper, the authors consider the network Multiple-Input Multiple-Output (MIMO) where the Base Stations (BS) exchanges only Channel State Information (CSI) to jointly design their transmission strategy. They particularly focus on a Signal-to-Interference-plus-Noise Ratio (SINR) balancing problem. First, the achievable rate regions with Symmetric Complex (SC) and Asymmetric Complex (AC) signaling techniques are investigated. It is observed that the AC signaling shows a substantial gain over the SC signaling in terms of maximizing the worst-user rate as the system Signal-to-Noise-Ratio (SNR) increases. After establishing the optimal SINR balancing algorithm with the SC signaling, they confirm the effectiveness of the AC signaling by proposing an efficient balancing scheme which outperforms the SC signaling scheme over all SNR regime.
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