Transmit digital multi-beam forming based on hyperbolic fractional delay filter

In this paper, a transmit digital multi-beam forming method based on hyperbolic fractional delay filter is presented, which provides effective time delay compensation and can reduce the consumption of hardware resources. In the proposed method,firstly, the hyperbolic function is expanded in the way of infinite product, and only two sub-filters are included in the expansion. Then, the hyperbolic fractional delay filter is obtained by using the solved sub-filter, so as to realize the clock fractional delay compensation. Then, the transmit digital multibeam forming is realized by using the designed fractional delay filter based on hyperbolic structure. Finally, the feasibility and effectiveness of the proposed design method are verified by experimental simulation.