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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An Overview of Transmission Theory and Techniques of Large-scale Antenna Systems for 5G Wireless Communications
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An overview of transmission theory and techniques of large-scale antenna systems for 5G wireless communications
TL;DR: In this article, the authors provide an overview of massive MIMO and large-scale distributed multiple access systems, including spectral efficiency analysis, channel state information (CSI) acquisition, wireless transmission technology, and resource allocation.
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SNR and Noise Variance Estimation for MIMO Systems
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TL;DR: This paper addresses SNR and noise variance estimation of MIMO systems for both a data aided (DA) model, a non-data aided (NDA) models, as well as a mixed model that uses known and unknown data symbols.
References
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Journal ArticleDOI
Overview of total least-squares methods
Ivan Markovsky,Sabine Van Huffel +1 more
TL;DR: It is explained how special structure of the weight matrix and the data matrix can be exploited for efficient cost function and first derivative computation that allows to obtain computationally efficient solution methods.
Proceedings ArticleDOI
A practical method for wireless channel reciprocity exploitation through relative calibration
TL;DR: Experimental results confirm the validity of the proposed linear reciprocity model, and of the calibration approach, which lets the transmitter acquire knowledge of the downlink channel state from the uplink channel estimates, through proper modeling and estimation of the RF circuitry impulse responses.
Journal ArticleDOI
A direct derivation of a single-antenna reciprocity relation for the time domain
TL;DR: In this article, a single-antenna reciprocity relation for the time domain is derived for the antenna on transmission; next, the same antenna is considered when it is receiving an incident plane wave.
Proceedings ArticleDOI
Non-reciprocal transceivers in OFDM/SDMA systems: impact and mitigation
TL;DR: In this article, the non-reciprocity of the base station analog hardware, which is part of the channel, introduces a very high level of multi-user interference and quantify the effect of the nonreciprocal by means of simulations.