Space-polarization MIMO architectures are proposed as a contributing technology to advance efficient spectrum utilization. These architectures have the advantage of leveraging both space and... Show More

Space-polarization MIMO architectures are proposed as a contributing technology to advance efficient spectrum utilization. These architectures have the advantage of leveraging both space and polarization channel correlations, opening the door to diversities and to the effective application of technologies at both the transmit side and the receive side to support spectrum efficiency and sharing. In this paper the authors review some of their work associated with polarization and space-polarization architectures, including channel modeling, sounding and parameter estimation to assist in the development of frequency-selective parametric models for performance characterizations; wideband polarimetric signal suppression; adaptive transmission for interference avoidance; and linear precoding with adaptive power control for energy-efficient communications in packet erasure channels.

The lightweight and low-cost 3-dimensional depth sensors have gained much attention in the computer vision and gaming industry. While its performance has been proven successful in the gaming... Show More

The lightweight and low-cost 3-dimensional depth sensors have gained much attention in the computer vision and gaming industry. While its performance has been proven successful in the gaming industry, these sensors have not been utilized successfully for assistive devices. Leveraging on this gap, this paper presents the design, implementation, and evaluation of a depth-vision coordinated robust architecture for obstacle detection and haptic feedback system for the blind. The proposed system scans the scene in front, converts it into depth matrix, processes the information, to identify obstacles including physical objects and humans, and provide relevant haptic feedback for navigation of the blind. Through design and evaluation, the proposed system has shown to successfully identify objects and humans, perform real-time distance measurements, and provide a working solution.

Smartphone centric ubiquitous sensing applications use a smartphone with external sensors. The 3.5mm audio interface provide a common data interface for communication in different smartphones. The... Show More

Smartphone centric ubiquitous sensing applications use a smartphone with external sensors. The 3.5mm audio interface provide a common data interface for communication in different smartphones. The 3.5mm audio interface cannot provide DC power to external sensors. Thus, power needs to be harvested from an earphone channel. The existing technology uses one earphone channel to harvest power. Consequently, for many smartphones the technology cannot harvest enough power to support external sensors. In this paper, based on frequency shift keying (FSK) modulation scheme, the authors have proposed a joint power harvesting and communication technology that can simultaneously harvest power and transfer data with the same earphone channels. Circuit measurements show that, the proposed technology can extract more than two times of power as from one earphone channel. Meanwhile, demodulation tests show that our newly-developed timer-based FSK demodulator can reliably recover the data transferred from a smartphone to external sensors without any error.

M-Health promises to bring the ease and robustness of the thermometer to general health. Casual handling implies non-invasive measurements, where of old the hand is the main instrument to diagnose... Show More

M-Health promises to bring the ease and robustness of the thermometer to general health. Casual handling implies non-invasive measurements, where of old the hand is the main instrument to diagnose health. A smartphone or a wearable can ‘extend' the hand by embedding diagnosing intelligence. The paper discusses the role of neural modeling & matching to create such intelligence for the determination of general health factors. It is illustrated in blood pressure measurement of 90-95% medical accuracy without additional accessories.