Ecole d'ingénieur et centre de recherche en Sciences du numérique

A framework for over-the-air reciprocity calibration for TDD massive MIMO systems

Jiang, Xiwen; Decurninge, Alexis; Gopala, Kalyana; Kaltenberger, Florian; Guillaud, Maxime; Slock, Dirk TM; Deneire, Luc

Submitted to IEEE Transactions on Wireless Communications / Also available on ArXiV, October 30, 2017

One of the biggest challenges in operating massive multiple-input multiple-output systems is the acquisition of accurate channel state information at the transmitter. To take up this challenge, time division duplex is more favorable thanks to its channel reciprocity between downlink and uplink. However, while the propagation channel over the air is reciprocal, the radio-frequency front-ends in the transceivers are not. Therefore, calibration is required to compensate the RF hardware asymmetry. Although various over-the-air calibration methods exist to address the above problem, this paper offers a unified representation of these algorithms, providing a higher level view on the calibration problem, and introduces innovations on calibration methods. We present a novel family of calibration methods, based on antenna grouping, which improve accuracy and speed up the calibration process compared to existing methods. We then provide the Cramer-Rao bound as the performance evaluation ´ benchmark and compare maximum likelihood and least squares estimators. We also differentiate between coherent and noncoherent accumulation of calibration measurements, and point out that enabling non-coherent accumulation allows the training to be spread in time, minimizing impact to the data service. Overall, these results have special value in allowing to design reciprocity calibration techniques that are both accurate and resource-effective.

Document Arxiv Bibtex

Titre:A framework for over-the-air reciprocity calibration for TDD massive MIMO systems
Mots Clés:Massive MIMO, TDD, channel reciprocity calibration
Département:Systèmes de Communication
Eurecom ref:5377
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Bibtex: @article{EURECOM+5377, year = {2017}, month = {10}, title = {{A} framework for over-the-air reciprocity calibration for {TDD} massive {MIMO} systems}, author = {{J}iang, {X}iwen and {D}ecurninge, {A}lexis and {G}opala, {K}alyana and {K}altenberger, {F}lorian and {G}uillaud, {M}axime and {S}lock, {D}irk {TM} and {D}eneire, {L}uc}, journal = {{S}ubmitted to {IEEE} {T}ransactions on {W}ireless {C}ommunications / {A}lso available on {A}r{X}i{V}, {O}ctober 30, 2017}, url = {} }
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