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In a paper “Design of Orthogonal Uplink Pilot Sequences for TDD Massive MIMO under Pilot Contamination”,it was mentioned that, In the uplink channel estimation, if each user occupy all available subcarriers, it will not be suitable for the TDD massive MIMO systems. Because in TDD massive MIMO system only a limited portion of the coherence interval can be used for the uplink training.

In this, I don’t really understand why coherence interval comes into picture while taking about subcarriers. Also, why it is not suitable if every users use all available subcarriers?

Thanks.

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