  Based on the application of the Sum-Product algorithm (SPA) over factor
graphs, this paper presents a graphical representation of generalized frequency
division multiplexing (GFDM) and filter bank multicarrier with offset QAM
(FBMC-OQAM). FBMC-OQAM was chosen because it has the advantage of reducing the
algorithm's complexity, since it is directly related to the number of possible
values assumed by the transmitted data symbols. The receiver algorithm
performance is evaluated by the bit error ratio (BER) estimation considering
two channel models, additive white Gaussian noise (AWGN) and flat-fading
time-variant (Rayleigh). Likewise, a computational complexity analysis is
presented. Numerical results show that the BER curves of the proposed scheme
present a good match compared with theoretical bit error probability curves.
