604 research outputs found
Mobile Power Network for Ultimate Mobility without Battery Life Anxiety
Similar to the evolution from the wired Internet to mobile Internet (MI), the
growing demand for power delivery anywhere and anytime appeals for power grid
transformation from wired to mobile domain. We propose here the next generation
of power delivery network -- mobile power network (MPN) for wireless power
transfer within a mobile range from several meters to tens of meters. At first,
we present the MPN's concept evolution and application scenarios. Then, we
introduce the MPN's supporting technology, namely resonant beam charging (RBC).
As a long-range wireless power transfer (WPT) method, RBC can safely deliver
multi-Watt power to multiple devices concurrently. Meanwhile, the recent
progress in RBC research has been summarized. Next, we specify the MPN's
architecture to provide the wide-area WPT coverage. Finally, we discuss the
MPN's features and challenges. MPN can enable the ultimate mobility by cutting
the final cord of mobile devices, realizing the "last-mile" mobile power
delivery.Comment: 10 pages, 5 figure
Sensing with OFDM Waveform at mmWave Band based on Micro-Doppler Analysis
Joint communication and sensing (JCAS) technology has been regarded as one of
the innovations in the 6G network. With the channel modeling proposed by the
3rd Generation Partnership Project (3GPP) TR 38.901, this paper investigates
the sensing capability using the millimeter-wave (mmWave) band with an
orthogonal frequency division multiplexing (OFDM) waveform. Based on
micro-Doppler (MD) analysis, we present two case studies, i.e., fan speed
detection and human activity recognition, to demonstrate the target modeling
with micro-motions, backscattering signal construction, and MD signature
extraction using an OFDM waveform at 28 GHz. Simulated signatures demonstrate
distinct fan rotation or human motion, and waveform parameters that affect the
MD signature extraction are analyzed. Simulation results draw the validity of
the proposed modeling and simulation methods, which also aim to facilitate the
generation of data sets for various JCAS applications
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