Sabeti, Parna and Farhang, Arman and Marchetti, Nicola and Doyle, Linda (2018) Low-Complexity CFO Compensation for OFDM-Based Massive MIMO Systems. In: 2017 IEEE Globecom Workshops (GC Wkshps): Proceedings. IEEE, Red Hook, NY, USA. ISBN 978-1-5386-3920-7

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Abstract

Massive multiple input multiple output (MIMO) plays a pivotal role in the fifth generation (5G) wireless networks. However, its performance heavily relies on accurate synchronization. Although timing offset (TO) can be avoided by applying orthogonal frequency division multiplexing (OFDM) with an adequate length of cyclic prefix (CP), carrier frequency offset (CFO) is still a challenging issue. Especially, in the uplink of multi-user massive MIMO systems, CFO compensation can impose a substantial amount of computational complexity to the base station (BS) due to the large number of BS antennas. To resolve this problem, in this paper, we propose a low-complexity CFO compensation technique. Our solution is performed after combining the received signals at the BS antennas. We calculate the interference matrix and discuss that asymptotically, this matrix can be obtained in terms of the power delay profile (PDP) of the users' channels. Consequently, the computational complexity of the CFO compensation process is independent of the number of BS antennas and thus remains constant as this number increases. Moreover, we show that the calculated interference matrix can be diagonalized due to its circulant property, and as a result, its inverse can be obtained straightforwardly. This leads to a considerable saving in the computational cost of the receiver. Numerical results are presented to verify the performance of our proposed CFO compensation technique and to investigate its computational complexity.

Item Type:	Book Section
Additional Information:	This paper was presented at 2017 IEEE Globecom Workshops (GC Wkshps), Singapore, 4–8 December 2017
Keywords:	Massive multiple input multiple output (MIMO); fifth generation (5G) wireless networks; orthogonal frequency division multiplexing (OFDM); carrier frequency offset(CFO); low-complexity CFO compensation technique; power delay profile (PDP); BS antennas;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering
Item ID:	11905
Identification Number:	https://doi.org/10.1109/GLOCOMW.2017.8269161
Depositing User:	Arman Farhang
Date Deposited:	28 Nov 2019 15:14
Publisher:	IEEE
Refereed:	Yes
URI:	Publisher Organisation
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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