Maximum-Likelihood Blind Synchronization for GFDM Systems

Generalized frequency-division multiplexing (GFDM) inherits the cyclic-prefixed (CP) block signaling structure from orthogonal frequency-division multiplexing (OFDM). The feasibility of CP-based maximum-likelihood (ML) blind synchronization for GFDM systems, however, has not been assessed in the literature. We find that such synchronization is complicated by the covariance structure of the signal which, due to nonorthogonal pulse shaping, possesses a time-varying signal power and some weak self-induced interference. Neglecting the latter and approximating the former by the average power enable us to obtain an approximate-ML solution based on a recent result on OFDM synchronization in wide-sense stationary uncorrelated scattering (WSSUS) channels. Simulations show that the resulting method for GFDM yields comparable performance, under commonly considered pulse-shaping filters, to its kin for OFDM.

[1]  Gerhard Fettweis,et al.  Non-Data Aided Frequency Synchronization Exploiting ICI in Non-Orthogonal Systems , 2014, 2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall).

[2]  Gerhard Fettweis,et al.  GFDM - Generalized Frequency Division Multiplexing , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[3]  David W. Lin,et al.  On Maximum-Likelihood Blind Synchronization Over WSSUS Channels for OFDM Systems , 2015, IEEE Transactions on Signal Processing.

[4]  Norman C. Beaulieu,et al.  An investigation of transmission properties of Xia pulses , 1999, 1999 IEEE International Conference on Communications (Cat. No. 99CH36311).

[5]  Gerhard Fettweis,et al.  A synchronization technique for generalized frequency division multiplexing , 2014, EURASIP J. Adv. Signal Process..

[6]  Gerhard Fettweis,et al.  Generalized Frequency Division Multiplexing for 5th Generation Cellular Networks , 2014, IEEE Transactions on Communications.

[7]  Gerhard Fettweis,et al.  Synchronization Using a Pseudo-Circular Preamble for Generalized Frequency Division Multiplexing in Vehicular Communication , 2015, 2015 IEEE 82nd Vehicular Technology Conference (VTC2015-Fall).