2022/10/22 by Wei Huang, Huang, Wei, Haiyang Zhang +5 · 1 citation
Engineering · #Antenna Design and Analysis #Millimeter-Wave Propagation and Modeling #Advanced Antenna and Metasurface Technologies
paper · pdf · doi:10.48550/arxiv.2210.12390
Dynamic metasurface antennas (DMAs) provide a new paradigm to realize large-scale antenna arrays for future wireless systems. In this paper, we study the downlink millimeter wave (mmWave) DMA systems with limited number of radio frequency (RF) chains. By using a specific DMA structure, an equivalent mmWave channel model is first explicitly characterized. Based on that, we propose an effective joint microstrip selection and beamforming scheme to accommodate for the limited number of RF chains. A low-complexity digital beamforming solution with channel gain-based microstrip selection is developed, while the analog beamformer is obtained via a coordinate ascent method. The proposed scheme is numerically shown to approach the performance of DMAs without RF chain reduction, verifying the effectiveness of the proposed schemes.