TR2019-058

CDM-based 4-Channel Digital Beamforming Transmitter Using a Single DAC



In recent years, digital beamforming (DBF) is gaining more attention for directional communication systems, thanks to its flexibility for beamstearing over both analogand hybrid-beamforming systems. However, conventional digital beamforming requires the use of independent Digital to Analog converters (DAC) and RF chain for each antenna element, which poses significant challenges such as cost, power consumption and heat dissipation. In this work, we present for the first time a novel low-cost solution with reduced hardware for DBF. Digital beamformed multiple baseband signal channels for different antenna elements through a single DAC by using digital signal processing. We implemented coding schemes in digital domain and successfully decoded and recovered them in the analog domain. The measured recovered signals before its fed to antenna elements for the performance evaluation of the system was done via real-time scope. The demonstrated technique provides costeffectiveness and reduction in size of the array system while keeping the integrity of the signals, required for the nextgeneration wireless communication systems.