Effects of channel aging in massive MIMO systems

By Kien T. Truong, Robert W. Heath. Journal of Communications and Networks, 2013

427 citations recorded by the source corpus.

Multiple-input multiple-output (MIMO) communication may provide high spectral efficiency through the deployment of a very large number of antenna elements at the base stations. The gains from massive MIMO communication come from the use of multiuser MIMO on the uplink and downlink, but with a large excess of antennas at the base station compared to the number of served users. Initial work on massive MIMO did not fully address several practical issues associated with its deployment. This paper considers the impact of channel aging on the performance of massive MIMO systems. The effects of channel variation are characterized as a function of different system parameters assuming a simple model for the channel time variations at the transmitter. Channel prediction is proposed to overcome channel aging effects. The analytical results on aging show how capacity is lost due to time variation in the channel. Numerical results in a multiceli network show that massive MIMO works even with some channel variation and that channel prediction could partially overcome channel aging effects.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/055365c6a7249e8217343d2d062131eb5f68d5f0

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Citations in the corpus

User-Centric Cell-Free Massive MIMO Networks: A Survey of Opportunities, Challenges and Solutions (2021, methodology): “Current studies for FDD in cell-free networks have shown that more than 60% reduction in the uplink feedback overhead (for the CSI estimated at the user, i.e., in the downlink) can be achieved compared to the conventional scheme relying on CSI feedback [114].”
OTFS: A New Generation of Modulation Addressing the Challenges of 5G (2018, background): “This promise comes at the cost of very complex architectures that cannot practically achieve capacity using traditional OFDM techniques and suffers performance degradation in the presence of time and frequency selectivity ( [2] and [3]).”
Massive MIMO: An Introduction (2015, neutral): “Considerable research is underway to mitigate these limitations [23–30].”
Towards 1 Gbps/UE in Cellular Systems: Understanding Ultra-Dense Small Cell Deployments (2015, background): “However, this technology still faces its own challenges, architecture and hardware impairments [91], pilot contamination [92] and accurate CSI acquisition [93] may be still an issue to provide a global solution.”
Age of Information: An Introduction and Survey (2020, background): “When the AoI ∆(t) is small, the auto-correlation function and the data rate both decay with respect to ∆(t) [47].”