In order to solve these defects as serious dispersion of band clutter, signal projection difficult to match and the high bit error rate during the network signal reception process, a precise receiving algorithm for subcarrier OFDM networks based on gradient mapping mechanism was proposed. Firstly, minimum mean square predictive inhibitory mechanism was constructed by fast Fourier transform and its inverse transform, as well as interpolation technique, and band pass filtering was used to eliminate the out of band clutter in full frequency domain. Then the gradient mapping mechanism was constructed based on real and imaginary part signals of digital features to match the projection points of the signal with the projected quadrants for reducing the network error rate. The simulation results show that this proposed algorithm has lower error rate reducing by 2, 3 orders, as well as higher signal gain intensity, increasing 20.5% and 4163% respectively under the Rician channel condition, and the power spectrum performance is closest to the ideal state compration compared with the current amplitude filter algorithm and the wave band frequency suppression algorithm. This algorithm has ideal signal reception precision and antifading performance with certain practical deployment value.