Open AccessProceedings Article
Relative channel reciprocity calibration in MIMO/TDD systems
Florian Kaltenberger,Haiyong Jiang,Maxime Guillaud,Raymond Knopp +3 more
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TLDR
It is demonstrated that in a single-user MIMO channel and for low signal-to-noise (SNR) ratios, the relative calibration method can increase the capacity close to the theoretical limit.Abstract:
Channel state information at the transmitter (CSIT) can greatly improve the capacity of a wireless MIMO communication system. In a time division duplex (TDD) system CSIT can be obtained by exploiting the reciprocity of the wireless channel. This however requires calibration of the radio frequency (RF) chains of the receiver and the transmitter, which are in general not reciprocal. In this paper we investigate different methods for relative calibration in the presence of frequency offsets between transmitter and receiver. We show results of theses calibration methods with real two-directional channel measurements, which were performed using the Eure-com MIMO Openair Sounder (EMOS). We demonstrate that in a single-user MIMO channel and for low signal-to-noise (SNR) ratios, the relative calibration method can increase the capacity close to the theoretical limit.read more
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Massive MIMO for next generation wireless systems
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Cell-Free Massive MIMO Versus Small Cells
TL;DR: In this paper, the authors proposed a max-min power control algorithm to ensure uniformly good service throughout the area of coverage in a cell-free massive MIMO system, where each user is served by a dedicated access point.
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Cell-Free Massive MIMO versus Small Cells
TL;DR: Under uncorrelated shadow fading conditions, the cell-free scheme provides nearly fivefold improvement in 95%-likely per-user throughput over the small-cell scheme, and tenfold improvement when shadow fading is correlated.
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Millimeter-Wave Massive MIMO Communication for Future Wireless Systems: A Survey
Sherif Adeshina Busari,Kazi Mohammed Saidul Huq,Shahid Mumtaz,Linglong Dai,Jonathan Rodriguez +4 more
TL;DR: The preliminary outcomes of extensive research on mmWave massive MIMO are presented and emerging trends together with their respective benefits, challenges, and proposed solutions are highlighted to point out current trends, evolving research issues and future directions on this technology.
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A Comprehensive Survey of Pilot Contamination in Massive MIMO—5G System
TL;DR: An extensive survey on pilot contamination in massive MIMO systems is provided, and other possible sources of pilot contamination are identified, which include hardware impairment and non-reciprocal transceivers.
References
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Exploitation of reciprocity in measured mimo channels
TL;DR: It is demonstrated that in a single-user MIMO channel and for low signal-to-noise (SNR) ratios, the relative calibration method can increase the capacity close to the theoretical limit.