A Low Complexity CFO Estimation Method for UFMC Systems

Hui ZHANG  Bin SHENG  Pengcheng ZHU  

IEICE TRANSACTIONS on Communications   Vol.E104-B    No.2    pp.169-177
Publication Date: 2021/02/01
Publicized: 2020/08/21
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3214
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
carrier frequency offset,  coherence bandwidth,  training sequence,  universal filtered multicarrier,  

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Universal filtered multicarrier (UFMC) systems offer a flexibility of filtering sub-bands with arbitrary bandwidth to suppress out-of-band (OoB) emission, while keeping the orthogonality between subcarriers in one sub-band. Oscillator discrepancies between the transmitter and receiver induce carrier frequency offset (CFO) in practical systems. In this paper, we propose a novel CFO estimation method for UFMC systems that has very low computational complexity and can then be used in practical systems. In order to fully exploit the coherence bandwidth of the channel, the training symbols are designed to have several identical segments in the frequency domain. As a result, the integral part of CFO can be estimated by simply determining the correlation between received signal and the training symbol. Simulation results show that the proposed method can achieve almost the same performance as an existing method and even a better performance in channels that have small decay parameter values. The proposed method can also be used in other multicarrier systems, such as orthogonal frequency division multiplexing (OFDM).