A Reducing Relative Bandwidth Method Based on Digital up Converter

Abstract

Apparently the comprehensive performance of array becomes impaired with the increasing of the relative bandwidth. In this paper, an algorithm based on Digital Up Converter (DUC) is proposed to reduce the relative bandwidth of the input broadband signal. The method works by changing the interelement spacing and sampling rate to carry the frequency spectrum of the input signal of array to higher frequency. When the carrier frequency is high enough, the broadband array signal processing will become a narrowband array signal processing, the narrowband array method can be used directly, and the computation could be reduced greatly. Simulation results and analysis confirm that the effect of reducing the relative bandwidth of the broadband signal is obvious and the proposed method is competent with any beamforming algorithm to form broadband patterns.