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The authors consider a wireless network in which a single source node located at the center of a unit area having m antennas transmits messages to n randomly located destination nodes in the same area having a single antenna each. To achieve the sum-rate proportional to m by transmit beamforming, Channel State Information (CSI) is essentially required at the transmitter (CSIT), which is hard to obtain in practice because of the time-varying nature of the channels and feedback overhead. They show that, even without CSIT, the achievable sum-rate scales as (mlogm) if a cooperation between receivers is allowed. By deriving the cut-set upper bound, they also show that (mlogm) scaling is optimal.
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