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Channel state information at the transmitter (CSIT) is a key ingredient inrealizing the multiplexing gain provided by distributed MIMO systems. For adownlink multiple-input single output (MISO) broadcast channel, with M antennasat the transmitters and K single antenna receivers, the maximum multiplexinggain or the maximum degrees of freedom (DoF) is min(M,K). The optimal DoF ofmin(M,K) is achievable if the transmitter has access to perfect, instantaneousCSIT from all receivers. In this paper, we pose the question that what isminimum amount of CSIT required per user in order to achieve the maximum DoF ofmin(M,K). By minimum amount of CSIT per user, we refer to the minimum fractionof time that the transmitter has access to perfect and instantaneous CSIT froma user. Through a novel converse proof and an achievable scheme, it is shownthat the minimum fraction of time, perfect CSIT is required per user in orderto achieve the DoF of min(M,K) is given by min(M,K)/K.

Minimum CSIT to achieve Maximum Degrees of Freedom for the MISO BC