In this paper, the impact of channel estimation error (CEE) on the sum-rate capacity of multiple-input-multiple-output (MIMO) heterogeneous networks (HetNets) is investigated. It is assumed that the receiver is a linear minimum mean-square (LMMS) receiver. The architecture is based on the deployment of macro base stations with large antenna arrays and a secondary tier of small cell base stations having fewer number of antenna arrays. The key contribution of the paper is to highlight the noticeable impact of CEE on the sum-rate capacity of macro-cells. Furthermore, it is shown that CEE has only marginal impact on the sum-rate capacity of small cells. Simulations for the sum rate of macro users versus that of the small cell users for time-division duplex (TDD) are performed and the results are compared with the case when channel estimation error is present.
@article{arxiv.1909.10105,
title = {Sum Rate Capacity of MIMO HetNet Systems in the Presence of Channel Estimation Error},
author = {Esha Bangar and Nima Taherkhani and Kamran Kiasaleh},
journal= {arXiv preprint arXiv:1909.10105},
year = {2019}
}