1 research outputs found
Ergodic Spectral Efficiency of Massive MIMO with Correlated Rician Channel and MRC Detection based on LS and MMSE Channel Estimation
In this paper, we study the spectral efficiency (SE) of a multi-cell massive
multiple-input multiple-output (MIMO) system with a spatially correlated Rician
channel. The correlation between least squares (LS) estimator and its error
complicates SE analysis, since signal and interference components become
cross-correlated, too. Minimum mean square error (MMSE) estimators do not
suffer from this burden. In some previous works, a proper part of the signal is
referred to interference, which makes them cross-uncorrelated, and leads to an
SE lower bound. In our modified approach, we extract and refer the
cross-correlated part of interference to the signal to attain this objective.
Here, we use this approach for calculating the instantaneous SE of maximum
ratio combining (MRC) detector under LS and MMSE estimation methods. We also
derive closed-form approximations of their ergodic SE. This approach is also
applicable to other linear channel estimators or data detectors. Numerical
results show that achievable SE surpasses that of the previous approach. They
also show that our approximation is close enough to Monte Carlo simulation
results, especially at the high number of the base station (BS) antennas.Comment: This paper is submitted to IET Communications. If finally accepted,
the copy of the record will be available at the IET Digital Library. Here is
the submission History: Submitted on 2019 Septemaber 5 Majorly Revised on
2019 December 24 Minorly Revised on 2020 May 1