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In this paper, the impact of channel estimation error (CEE) on the sum-ratecapacity of multiple-input-multiple-output (MIMO) heterogeneous networks(HetNets) is investigated. It is assumed that the receiver is a linear minimummean-square (LMMS) receiver. The architecture is based on the deployment ofmacro base stations with large antenna arrays and a secondary tier of smallcell base stations having fewer number of antenna arrays. The key contributionof the paper is to highlight the noticeable impact of CEE on the sum-ratecapacity of macro-cells. Furthermore, it is shown that CEE has only marginalimpact on the sum-rate capacity of small cells. Simulations for the sum rate ofmacro users versus that of the small cell users for time-division duplex (TDD)are performed and the results are compared with the case when channelestimation error is present.

Sum Rate Capacity of MIMO HetNet Systems in the Presence of Channel Estimation Error