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This work proposes a new power management scheme for wirelessly-powered UHF RFID tags with flexible inkjet-printed Electrochromic (EC) display for human-to-device interaction. EC display on polyimide substrate is integrated at tag side to provide an ambient and direct human-to-device display interface. An aggressive duty-cycling power management scheme with dual supplies is designed to drive the EC...
The scalable and massively parallel computing systems composed of many processors, which are connected on chips that will become more and more complex and unreliable. This paper presents a bio-inspired error tolerance framework and three design principles based on the Autonomous Error Tolerant (AET) architecture. A nearby error perception mechanism is carefully designed to detect faults and an initiative...
Internet of Things (IoT) is a fast developing vision in which physical quantities are digitized, processed and analyzed. Internet of Mobile Things (IoMT) as one of new domains of IoT, due to mobility, requires a more demanding and rigorous solution in many aspects, especially in terms of energy efficiency. We propose a solution consisting of energy efficient and fast hardware platform for building...
This paper introduces a hierarchical clock interconnection network with two-level bufferless standing wave resonant clock distribution to minimize the clock power consumption in a synchronous system. The first level is a serpentine network which consists of many coupled standing wave oscillators to distribute clock signals in the whole chip area. The second level is a group of fishbone architectures...
Compressed sensing (CS) is an emerging technology that can be applied to impulse radio ultra-wideband (IR-UWB) receivers. CS represents an attractive solution for its capability of recovering a signal from a small number of measurements using sub-Nyquist sampling rate analog to digital converters (ADC). In this paper we investigate practical design parameters for low power CS based UWB system, including...
A compressed sensing (CS) based impulse radio ultra-wideband (IR-UWB) receiver with two-path noise-reducing RF front-end architecture is proposed. By adding an identical input path (antenna and gain stage) together with a mixer, the noise in the received signal before feeding into the CS sampling block is alleviated comparing with the conventional CS receiver. Moreover, the mixing stage shifts the...
This paper presents a quality-of-service (QoS) based RFID system for smart assembly workshop towards the industrial Internet of Things (IoT). Under the context of the industrial IoT, every object in the assembly workshop is interconnected, which enables automated monitor of the production environment, track of the components/products/tools, and control of the machines and the execution process. The...
This paper presents a multiplication reduction technique through near-zero approximation, enabling embedded learning in resource-constrained IoT devices. The intrinsic resilience of neural network and the sparsity of data are identified and utilized. Based on the analysis of leading zero counting and adjustable threshold, intentional approximation is applied to reduce near-zero multiplications. By...
Increasing the energy efficiency and performance while providing the customizability and scalability is vital for embedded processors adapting to domain-specific applications such as Internet of Things. In this paper, we proposed a reconfigurable and scalable control-centric architecture, and implemented the design consisting of two cores and an on-chip multi-mode router in 65 nm technology. The reconfigurability...
This paper presents a Multi-Frequency Time Division Multiple Access (MF-TDMA) scheme for long-packet and energy-constraint Radio Frequency Identification (RFID) sensing applications. The scheme takes advantages of both multiple transmission channels and scheduled time slots for high throughput and low latency. In addition, a dedicated channel is allocated to provide synchronization and coordination...
This paper addresses the issue of UWB signal acquisition in the context of wireless powered UWB RFID systems. In this scenario, the data transmission is based on short packet so as to meet the micro-power budget of autonomous power harvesting. The burst short packet transmission as well as the low duty cycling UWB pulse modulation places a stringent challenge at the UWB receiver for timing acquisition...
This paper presents a SoC design that combines general purpose control and application-specific acceleration within a reconfigurable ASIP core for Internet-of-Things applications. Sufficient processing capability and re-configurability are provided by highly customizable data path and efficient sequence control loop. By fully utilizing the data path of proposed architecture, the processor significantly...
This paper presents optimizations on guard time and synchronization cycle for Time Division Multiple Access (TDMA) based deterministic Radio Frequency Identification (RFID) system. The TDMA scheme can provide guaranteed latency and high throughput for RFID system that includes fixed number of users (tags) and requests long-message transmission. However, collisions due to accumulated clock drifts of...
A low-power coarse-fine time-to-digital converter (TDC) with a wide dynamic range and high time resolution is presented in this paper. The first stage is based on a buffer delay-line chain. Then the input signal and its adjacent reference clock are injected into a Vernier-delay-line (VDL) time-quantizer at the second stage for a finer resolution. The proposed architecture can provide high resolution...
In this paper, we present a portable SOS device with wireless communication. This device is based on all-digital-phase-locked-loop (ADPLL). A wake-up mode is implemented for low power consumption. With extra biological sensors attached to the users, the device is awakened by abnormal signals and actively sends a SOS signal for help. Moreover, it can use those sensors to collect information from users...
To implement multiview video decoding on network on-chip (NoC) based homogeneous multicore architectures, the selection of switching techniques for routers is one of the most important aspects for design space exploration. Circuit switching and wormhole switching are two most feasible switching techniques for on-chip networks. To choose the suitable switching technique, we perform the comparison on...
This paper presents Software Defined Radio (SDR) in RFID sensing applications focusing on wideband mixer and VGA design. The wideband receiver can support UHF, UWB band for commonly used long-range RFID standards ranging from 400MHz to 6GHz. The wideband mixer is of folded topology with switching biased technique, achieving a maximum 11.5dB conversion gain with only an 8dB DSB noise figure and 16dB...
Radio Frequency Identification (RFID) enabled wireless sensing applications require reliable multi-parameter and multi-tag sensory data transmission in real-time manner. This paper presents a MIMO-based backscattering RFID system, aiming at enhancing the communication robustness by means of a deterministic anti-collision scheme. The proposed interleave division multiple access (IDMA) mechanism not...
Compressed sensing (CS) based impulse radio ultra-wideband (IR-UWB) receiver has attracted much attention in recent years. This paper presents an architectural analysis of the CS-based IR-UWB receiver with focuses on investigating the random noise processes in the CS measurement procedure. We find that different noise sources (sky noise or amplifier noise) and different receiver architectures (parallel...
This paper presents a wirelessly-powered sensor tag with a time-domain sensor interface for wireless sensing applications. The tag is remotely powered by RF wave. Instead of traditional approaches employing conventional ADCs for quantization and transmitter for data communication, in this work, a Pulse Position Modulator incorporating simple impulse radio UWB (IR-UWB) transmitter is proposed to convert...
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