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In this paper, we propose an energy-efficient approximate multiplier design approach. Fundamental to this approach is configurable lossy logic compression, coupled with low-cost error mitigation. The logic compression is aimed at reducing the number of product rows using progressive bit significance, and thereby decreasing the number of reduction stages in Wallace-tree accumulation. This accounts...
The estimation of symbol timing offset (STO) is an important issue for orthogonal frequency division multiplexing (OFDM) systems. In the literature, a variety of STO estimation methods have been proposed. In this paper, we propose a new blind STO estimation for OFDM systems with constant modulus (CM) constellation. The proposed estimator can estimate STO with only one OFDM symbol. Besides, a low complexity...
This paper presents a split-based time-interleaved (TI) ADC with digital background timing calibration for wideband applications. Each interleaved channel uses a split ADC, which adds a dimension for timing-skew error detection and correction. Thus, the complexity of digital post-processing is greatly relaxed without the use of any dummy channel. The behavioral simulations show a 28 dB and 35 dB improvements...
Being able to comprehensively evaluate the individual strengths and weaknesses of worst-case execution time (WCET) analysis tools through benchmarking is essential for improving their accuracy. Unfortunately, a lack of knowledge about the detailed characteristics, actual complexities, and internal structures of existing benchmarks often prevents finegrained assessments, and sometimes even results...
Analog/mixed-signal (AMS) systems are rapidly expanding in all domains of information and communication technology. They are a critical part of the support for large-scale high-performance digital systems, provide important functionalities in medium-scale embedded and mobile systems, and act as a core organ of autonomous electronics such as sensor nodes. Analog and digital parts are closely inter-mixed,...
DRAM refresh power, which is consumed solely to preserve data, is rapidly increasing as capacity increases. A study predicts that the power will account for up to 35% of total DRAM power in the high capacity DRAM device. While various schemes were proposed to reduce the refresh power, those could not be adopted to commercial products due to cost overhead and design complexity issues. In this paper,...
This study proposes a system that allows for the quantitative creation of music using a few parameters identified to be relevant to the association between music and emotion. One proposed emotional model of music suggests that musical emotion depends on a realization of and a deviation from an expectation. Expectations and their realizations and deviations are regarded as effects of probabilities,...
In this paper, relay selection schemes in asynchronous multi-relay network for frequency selective channels have been investigated. In particular, distributed Alamouti space time coding and amplify-and-forward (AF) relaying are exploited, and orthogonal frequency division multiplexing (OFDM) is implemented with adaptive cyclic prefix (CP) to deal with the frequency selectivity of the channels and...
Time-triggered architectures bring to the applications a considerable degree of determinism and a strong conformity between their execution and their logical model. The Extended Timing Definition Language (E-TDL) is a time-triggered framework for programming real-time applications that can be structured through multiple independent components with fully adaptive behaviors. In this paper, we propose...
Advanced logic and physical synthesis tools provide a vast number of tunable parameters that can significantly impact physical design quality, but the complexity of the parameter design space requires intelligent search algorithms. To fully utilize the optimization potential of these tools, we propose SynTunSys, a system that adds a new level of abstraction between designers and design tools for managing...
Functional Engineering Change Order (ECO) is necessary for logic rectification at late design stages. Existing works mainly focus on identifying a minimal logic difference between the original netlist and the revised netlist, which is called a patch. The patch is then implemented by technology mapping using spare cells. However, there may be insufficient spare cells around the physical location of...
Engineering changes and their propagation through a system provide insight into the complexity of a system. In an effort to identify systematic trends, we have analyzed two very different JPL-led space mission projects to classify the change activity and assess change propagation. The projects selected are a Mars lander mission, Mars Science Laboratory (MSL), and an Earth-orbiting mission, Soil Moisture...
In this paper, we propose a 2-dimensional dynamic programming (DP) based detailed placement algorithm for modern FPGAs for wirelength and timing optimization. By tuning a control parameter, our algorithm can perform fast heuristic or exact optimization. Our algorithm further enables us to solve the single row placement problem optimally which was not possible with the previous DP approaches, while...
For the problem how to make the decision of RMS's reconfiguration timing, a decision-making method based on information entropy and cusp catastrophe theory is proposed. The information entropy was used to characterize the complexity of RMS, including the factors of machine states, part states and so on. The RMS passive and positive information entropies were used as control variables of cusp catastrophe...
In human-human dialogue, especially in attentive listening such as counseling, backchannels play an important role. Appropriately coordinated backchannels will not only make smooth communication but also help establish rapport. By collecting counseling dialogue, we investigate whether and how synchrony is expressed by prosodic and linguistic features of backchannels with respect to the preceding speaker's...
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...
Cloning of integrated circuit (IC) chips have emerged as a significant threat to the semiconductor industry. Unauthorized extraction of design information from IC chips can be carried out in numerous ways. Invasive methods physically disassemble chip package and gain access to the different layers of a die through the low-cost delaying processing. This paper presents a new countermeasure exploiting...
We experimentally demonstrate Tx DSP-free 112-Gbit/s PAM-4 transmission over 20 km SMF using commercially available 1298 nm 25-GHz TOSA and ROSA devices. Superior performance is achieved by using timing recovery supported DSP at the receiver.
As an overlay cognitive radio, transform domain communication system (TDCS) has been proposed to support reliable communications with low probability of interception. However, most of research on TDCS assume perfect synchronization to simplify algorithm design. In this paper, we present a low complexity symbol timing offset (STO) and carrier frequency offset (CFO) estimation method for practical TDCS...
We present a new divide-and-conquer algorithm for mid-range multiprecision integer division which is typically 20-25% faster than the recent algorithms of Moller and Granlund implemented in the GNU Multi Precision (GMP) library.
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