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This paper presents a novel register file with self-indexed features, targeting the DSP/media algorithm with massive data locality. The self-indexed register file (SIRF) contains 128 high-speed registers, 4 input ports and 4 output ports. It can be accessed with the double circular window mode, or simply with the immediate index mode. SIRF can eliminate write after write (WAW) dependence without register...
High performance chip design is always a hot topic in integrated circuit (IC) field. Clock design plays a critical role in improving chip performance and affecting power consumption. The regular clock layout has always been the ideal way to improve the timing of results. In this paper, we propose a symmetrical clock tree synthesis algorithm for top-level design, including tree architecture planning,...
This paper presents a reconfigurable application specific integrated circuit (ASIC) like image interpolation implementation method. Parallel data flow and pipeline structure are used and optimized for efficient hardware acceleration. The coefficients could be easily reconfigured to support multiple interpolation filter taps and image resolution. We implement this method on a reconfigurable mathematical...
Due to the asymptotically orthogonal channel, minimum mean square error detection algorithm is near-optimal for uplink massive MIMO systems, but it involves matrix inversion with high complexity. This paper proposes a high-parallelism detection algorithm in an iterative way to avoid the complicated matrix inversion. The parallelism level is analyzed and convergence is proved in detail. The proposed...
In this paper, we consider a dynamic feedback problem of a pendulum coupled with a viscous damped wave equation. We show that the system operator generates a C0-semigroup of contractions in the energy state space, and the system is well-posed. By giving the asymptotic expressions of the eigenvalues of the system, we know that they all locate in the left hand side of the complex plane. It follows that...
This paper reports a micro Fourier transform infrared spectrometer (μFTIR), enabled by an innovative H-shaped electrothermal microelectromechanical systems (MEMS) mirror. The H-shaped MEMS mirror consists of 32 symmetrically-distributed three-level ladder bi-layer actuators, leading to large linear displacement with negligible tilting. The tilting angle of the mirror is as small as 0.06°, so there...
Device-free passive localization aims at locating moving objects that do not carry any localization devices. The rationale of this problem is based on the fact that a moving object can result in changes of received signal strength (RSS) of the wireless links. Existing studies only consider localization of a single-target localization or a multi-target group moving together, equivalent to a single-target...
Wi-Fi based indoor localization is gaining popularity because of the wide adoption of WiFi technologies in existing infrastructure. In order to increase the accuracy of Wi-Fi localization, we develop a novel localization method using One-to-all Regularized Logistic Regression-based Classification (ORLRC). This method is based on logistic regression. The proposed ORLRC is compared with the k-means...
High performance chip design is always a hot topic in integrated circuit (IC) field. Clock design plays a critical role in improving chip performance. In this paper, we propose an automatic and practical flow for clock tree design, which is a popular clock structure. Based on deferred-merge embedding (DME) algorithm, we integrate buffer insertion and obstacle processing into the layout design. The...
Along with the continuous improvement of various properties of green building, the amount of data is more and more big. The operation and maintenance of the green buildings need to use these data to analyze and make decisions, and the premise of the data analysis is that the data collected by each system is accurate. In this paper, the data in the PV power generation system and the air conditioning...
Many-to-many (M-to-N) personalized concurrent communication is one of the most dense traffic patterns in high performance computing system. Each node in group M sends different messages to every node in group N. Hot-spot congestions are the bottleneck of this communication pattern. In this paper, a proactive congestion avoidance mechanism is proposed to optimize many-to-many personalized concurrent...
We study cooperative spectrum sensing in cognitive radio networks (CRN) using machine learning techniques in this paper. A low-dimensional probability vector is proposed as the feature vector for machine learning based classification, instead of the N-dimensional energy vector in a CRN with a single primary user (PU) and N secondary users (SUs). This proposed method down-converts a high-dimensional...
Design Space Exploration (DSE) is a critical step in the chip design. The tradeoffs and interactions among parameters are traditionally evaluated by simulating or synthesizing a variety of designs which is intractable. The predictive modeling techniques have been applied to predict the design performance for DSE. For the system-on-a-chip (SoC) DSE cases, however, it is difficult to achieve high accuracy...
As the feature size of the semiconductor process is scaling down to 10nm and below, it is possible to assemble systems with high performance processors that can theoretically provide computational power of up to tens of PLOPS. However, the power consumption of these systems is also rocketing up to tens of millions watts, and the actual performance is only around 60% of the theoretical performance...
Discrete Fourier Transform(DFT) is one of the frequently used kernels in a variety of signal processing applications. Most previous state-of-the-art work has focused on the transform size of a power of 2. And many implementations of non-power-of-two sized DFT is customized for a specific application. In this paper, a parallel-processing architecture based on Field-Programmable Gate Array (FPGA) for...
This paper investigates the green characteristic of the non-data-bearing orthogonal frequency-division multiplexing (NDB OFDM) transmission in wireless localization, relative to being widely used non-pulse-shaping pseudorandom noise (NPS PN) transmission in current satellite- and ground-based positioning systems. For obtaining a fixed ranging accuracy, the required NDB OFDM transmit energy is proven...
This paper selects a reasonable threshold for energy detection in cognitive radio, where a non-line-of-sight (NLOS) environment is considered. The secondary user (SU) uses this threshold to detect whether the spectrum is occupied by the primary user (PU) or not. Three specific NLOS scenarios are depicted and analyzed in this paper. In order to improve the existing threshold value in energy detection...
Cognitive Radio(CR) is a promising technology to fully utilize the constrained spectrum, and cooperative spectrum sharing in cognitive network is regarded as an important and challenging issue. This paper considers that primary user(PU) is willing to coexist with secondary users(SUs) once it is paid and its Signal to Interference-plus-Noise Ratio(SINR) is assured. Since the spectrum state is not deterministic,...
As the substitute of standard mice, 3D mice (Air mice) have been widely researched. Compared with standard mice, 3D mice are able to operate off table. Many types of 3D mice have been developed and tested for computer or TV. These 3D mice can be utilized as 3 dimensional interfaces with the PC for various applications such as 3D images and 3D games. Although most of them are more intuitive than standard...
Dynamic spectrum access is an effective approach to improve the spectrum utilization. When primary user (PU) leases its spectrum to secondary users (SU), the spectrum efficiency can be enhanced, however, PU might be interfered by the co-existence of SU. This paper considers the situation that PU is willing to coexist with SU once it is paid and its Signal to Interference-plus-Noise Ratio (SINR) is...
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