Abstract: A waveform generation apparatus is configured to generate a radio-frequency waveform using duty-cycle-based time modulation. The waveform generation apparatus includes a controller module, a duty-cycle generation module, a pulse-modulation module, and an output interface module. The controller module is configured to provide waveform-defining parameters and timing information associated with a sequence of modulation periods. The duty-cycle generation module is coupled to the controller module and is configured to generate, for each modulation period, a duty-cycle value based on the waveform-defining parameters. The pulse-modulation module is coupled to the duty-cycle generation module and is configured to apply the duty-cycle value to a high-frequency pulse signal to produce a time-modulated waveform. The output interface module is configured to deliver the time-modulated waveform toward a radio-frequency transmission path.

Abstract: A pixel-based reconfigurable antenna (PRA) and the method for designing a PRA are disclosed. The PRA supports a total of N fluid antenna system (FAS) ports uniformly distributed across a linear length of W?. A physical model is established to connect the correlation of the antenna's reconfigurable radiation patterns with the spatial correlation of physical displacement. A two-step search optimization algorithm is proposed to find the optimized configurations of a pixel layer of the PRA.

Abstract: A pixel-based reconfigurable antenna (PRA) and the method for designing a PRA are disclosed. The PRA supports a total of N fluid antenna system (FAS) ports uniformly distributed across a linear length of W?. A physical model is established to connect the correlation of the antenna's reconfigurable radiation patterns with the spatial correlation of physical displacement. A two-step search optimization algorithm is proposed to find the optimized configurations of a pixel layer of the PRA.