Design Considerations and FPGA Implementation of a Wideband
All-Digital Transmit Beamformer with 50% of Fractional Bandwidth
In this work, we report a design and
implementation of an all-digital transmit phased array.
The key design considerations have been reviewed including
applications of multi-core DSM and wideband beamformer
based on space-time theory. The built prototype of 8-element
array using a commerical FPGA board demonstrated the
feasibility of designing real-time wideband digital beamformer.
The measured beam pattern for RF frequency of 2.5 GHz
with 1.25 GHz bandwidth agreed well with simulation. To the
authors’ knowledge, this fractional bandwidth of 50% is the
widest one reported so far. This advances the state-of-the art in
terms of fractional bandwidth by more than 40 times, which
shows that all-digital transmitter is a very promising technology
for next generation directional communications such as 5G and