Abstract: A beam precoding method based on the improved orthogonal matching pursuit (OMP) algorithm is proposed for the millimeter-wave hybrid beamforming system, combined with the analysis of the antenna mutual coupling effect. This method first deduces the antenna mutual coupling matrix, on the basis of which the equivalent mutual coupling channel model is established. Second, with the goal of maximizing the transmission rate, the precoding vector is calculated by utilizing the improved OMP algorithm to obtain the optimal beam under the mutual coupling effect, when the equivalent mutual coupling channel model has been established. Simulation shows that the beam precoding method proposed in this paper can effectively suppress the beam distortion caused by the mutual coupling effect and guarantee the communication quality.

Key words: millimeter wave, beamforming, mutual coupling effect, beam precoding