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Massive MIMO performance with timing & frequency errors
2017 Edition, November 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Pilot contamination degrades the system performance in time-division duplex (TDD) massive multiple-input multiple-output (MIMO) systems when the orthogonality among the uplink (UL) training sequences is broken. Radio front-end (RFE) impairments can contribute to the pilot...

Massive MIMO NOMA Downlink
2018 Edition, December 1, 2018 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The performance of multi-cell massive multiple-input multiple-output (MIMO) downlink (DL) with nonorthogonal multiple access (NOMA) is investigated. A novel pilot assignment for NOMA users is proposed to mitigate intra-cluster pilot contamination and to alleviate the...

Multiuser Massive MIMO Performance With Calibration Errors
2016 Edition, Volume 15, July 1, 2016 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Massive multiple-input multiple-output (MIMO) in time-division duplexing (TDD) systems relies on the channel reciprocity to obtain the downlink (DL) channel state information (CSI) with the uplink (UL) CSI. But in practice, the transmit branch is composed of different radio...

Fundamentals of massive MIMO
2015 Edition, June 1, 2015 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Presents a collection of slides covering the following topics: TDD; MMSE channel estimation; orthogonal multiplexing; spatial multiplexing; antennas; beamforming; MIMO precoding; maximum-ratio versus zero-forcing processing; linear processing; massive MIMO propagation channels;...

Massive MIMO: An Introduction
2015 Edition, Volume 20, January 1, 2015 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Demand for wireless throughput, both mobile and fixed, will always increase. One can anticipate that, in five or ten years, millions of augmented reality users in a large city will want to transmit and receive 3D personal high-definition video more or less continuously, say 100 megabits per second...

Massive MIMO Performance with Pilot Reuse
2016 Edition, September 1, 2016 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Achieving the promising gains of massive multiple- input multiple-output (MIMO) relies on accurate channel state information. In this paper, results from detailed time-dynamic system simulations of reciprocity based massive MIMO systems in the 3GPP 3D scenarios are...

Load modulated massive MIMO
2014 Edition, December 1, 2014 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We propose a new hardware architecture for cost-and size-effective implementation of massive MIMO transmitters based on load modulation that is fully compatible with standard receiver architectures. With load modulation, a massive MIMO transmitter can be...

Sphere Decoding for Millimeter Wave Massive MIMO
2019 Edition, September 1, 2019 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Massive MIMO can significantly increase the data rate of a wireless communications system. The requirement for even greater data transmission rates in 5G systems has prompted the consideration of the largely unused millimeter wave (mmWave) band. To mitigate the high path loss at mmW...

Massive MIMO Combining with Switches
2016 Edition, Volume 5, June 1, 2016 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Massive multiple-input multiple-output (MIMO) is expected to play a central role in future wireless systems. The deployment of large antenna arrays at the base station and the mobile users offers multiplexing and beamforming gains that boost system spectral efficiency. Unfortunately,...

How to calibrate massive MIMO?
2015 Edition, June 1, 2015 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Time-division duplexing (TDD) systems enjoy one superior characteristic referred to as channel reciprocity. However, due to different radio frequency branches for transmitting and receiving, calibrating the antenna array at the base station (BS) is necessary to effect this reciprocity...

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