Proceedings ArticleDOI
Delay spread properties in a measured massive MIMO system at 2.6 GHz
Sohail Payami,Fredrik Tufvesson +1 more
- pp 53-57
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TLDR
This paper investigates how much standard linear precoders help the ISI mitigation by shortening the rms delay spread, and measures a massive MIMO channel with 128 antennas at the base station and 36 users, including 26 line-of-sight and 10 non line- of-sight.Abstract:
Massive multiple-input multiple-output (MIMO) systems, where the base station (BS) is equipped with a large number of antennas and the mobile devices have a single antenna, can significantly enhance the system performance. In many wireless systems inter symbol interference (ISI) due to delay dispersion of the channel can dramatically affect the demodulation process of the received signals. Precoding in massive MIMO can reduce or eliminate ISI, while still exploiting the spatial diversity. In this paper, we investigate how much standard linear precoders help the ISI mitigation by shortening the rms delay spread. In order to evaluate the system performance, we measured a massive MIMO channel with 128 antennas at the base station and 36 users, including 26 line-of-sight and 10 non line-of-sight, each equipped with a single antenna. We also compare the results from the measurements with an independent identically distributed Gaussian channel with an exponentially decaying average power delay profile.read more
Citations
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Journal ArticleDOI
Filter Bank Multicarrier Modulation Schemes for Future Mobile Communications
TL;DR: This paper provides a unifying framework, discussion, and performance evaluation of FBMC and compares it with OFDM-based schemes and derives closed-form solutions for the signal-to-interference ratio in doubly-selective channels and shows that in many practical cases, one-tap equalizers are sufficient.
Journal ArticleDOI
Recent advances and future challenges for massive MIMO channel measurements and models
TL;DR: This article compares channel characteristics of four latest massive MIMO channel models, such as receiver spatial correlation functions and channel capacities, and provides an overview of the latest developments in massive MimO channel measurements and models.
Proceedings ArticleDOI
Channel Hardening in Massive MIMO-A Measurement Based Analysis
TL;DR: In this paper, channel hardening in massive MIMO systems is assessed based on analysis of measurement data, and it is shown that in a real scenario, a channel hardness of 3.2-4.6 dB, measured as a reduction of the standard deviation of the channel gain, can be expected depending on the amount of user interaction.
Journal ArticleDOI
Hybrid Beamforming With a Reduced Number of Phase Shifters for Massive MIMO Systems
TL;DR: In this article, two novel hybrid beamforming methods are proposed to reduce the cost and power consumption of hybrid beamformers with a subconnected phase shifter network structure in massive MIMO systems.
Journal ArticleDOI
Energy-Efficient and Low-Complexity Uplink Transceiver for Massive Spatial Modulation MIMO
TL;DR: A low-complexity generalized approximate message passing detector (GAMPD) is constructed, which can exploit both the sparsity and prior probability distribution of the transmitted signal and is suitable for hardware implementation because its most complex operation is only matrix-vector multiplication.
References
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Proceedings Article
Wireless communications
TL;DR: This book aims to provide a chronology of key events and individuals involved in the development of microelectronics technology over the past 50 years and some of the individuals involved have been identified and named.
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Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
TL;DR: A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval and a complete multi-cellular analysis yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve.
Journal ArticleDOI
Massive MIMO for next generation wireless systems
TL;DR: While massive MIMO renders many traditional research problems irrelevant, it uncovers entirely new problems that urgently need attention: the challenge of making many low-cost low-precision components that work effectively together, acquisition and synchronization for newly joined terminals, the exploitation of extra degrees of freedom provided by the excess of service antennas, reducing internal power consumption to achieve total energy efficiency reductions, and finding new deployment scenarios.
Journal ArticleDOI
Scaling Up MIMO: Opportunities and Challenges with Very Large Arrays
Fredrik Rusek,Daniel Persson,Buon Kiong Lau,Erik G. Larsson,Thomas L. Marzetta,Fredrik Tufvesson +5 more
TL;DR: The gains in multiuser systems are even more impressive, because such systems offer the possibility to transmit simultaneously to several users and the flexibility to select what users to schedule for reception at any given point in time.