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In orthogonal frequency division multiplexing (OFDM)/offset quadrature amplitude modulation (OQAM) systems,the relationship between the input of the synthesis filter bank (SFB) and the output of the analysis filter bank (AFB) is much more complicated than OFDM due to its special prototype filter.By analyzing the transmultiplexer response characteristics,an equivalent trans-multiplexer matrix is proposed to describe the relationship between the input and the output.With the equivalent matrix,the output can be easily computed using matrix multiplication with the input.Moreover,with the inverse of the equivalent trans-multiplexer matrix,imaginary interference can be eliminated using the precoding method.The simulation results show the correctness of the equivalent trans-multiplexer matrix.