The XFDMSync GNU Radio OOT module provides optimized blocks for multicarrier synchronization. During development, the main targets for multicarrier systems are OFDM and GFDM. Algorithmically, the module relies on an improved Schmidl&Cox algorithm according to Awoseyila.
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Awoseyila A, Kasparis C, Evans B: Improved preamble-aided timing estimation for OFDM systems. IEEE Communications Letters 2008, 12(11):825-827, DOI: 10.1109/LCOMM.2008.081054
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Gaspar, I.S., Mendes, L.L., Michailow, N. et al. A synchronization technique for generalized frequency division multiplexing. EURASIP J. Adv. Signal Process. (2014) 2014: 67. DOI: 10.1186/1687-6180-2014-67
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Schmidl, Cox Robust frequency and timing synchronization for OFDM. IEEE Transactions on Communications, vol. 45, issue 12, December 1997, DOI: 10.1109/26.650240
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Zivkovic, Mathar Preamble-Based SNR Estimation in Frequency Selective Channels for Wireless OFDM Systems, Vehicular Technology Conference (VTC Spring), April 2009, Barcelona, Spain, DOI: 10.1109/VETECS.2009.5073813