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

TL;DR

This paper analyzes how channel estimation errors affect the sum-rate capacity in MIMO HetNets, revealing significant impact on macro-cells but minimal on small cells, supported by simulation results.

Contribution

It highlights the differential impact of channel estimation errors on macro and small cell capacities in MIMO HetNets.

Findings

CEE significantly reduces macro-cell sum-rate capacity.

CEE has marginal effect on small cell sum-rate capacity.

Simulation results confirm the impact of CEE on macro-cells.

Abstract

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.