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A Channel Estimator for LTE Downlink Mapped on a Multi-Core Processor Platform

A Channel Estimator for LTE Downlink Mapped on a Multi-Core ...

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Maofei He Jiajie Zhang Wenhua Fan Zhiyi Yu Xiaoyang Zeng State Key Lab of ASIC and System Fudan University Shanghai 201203 P.R. China

This paper presents an implementation of channel estimation for LTE downlink MIMO system on a multicore processor platform. With the development of wireless communication, it is gradually difficult for asic baseband processing solutions to adapt the rapidly changing communication requirements. Multicore solution for communication applications arises due to its programmability and reconfigurability. The multi-core processor platform is a mesh array of SIMD cores which is well suited for communication applications. A channel estimator with the throughput of 113.5Msymbol/s is realized by fully utilizing task-level parallelism, data-level parallelism and pipeline structure on multi-core processor platform

关键词： OFDM TV Time frequency analysis Interpolation Assembly Switches Signal to noise ratio

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Quantum Mechanical Effects on the Threshold Voltage of the Evenly Doped Surrounding-Gate MOSFETs

Quantum Mechanical Effects on the Threshold Voltage of the E...

引用

2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Guanghui Mei Peicheng Li Guangxi Hu Ran Liu Tingao Tang State Key Lab of ASIC and System School of Information Science and Technology Fudan University Shanghai 200433 China

In this work, we investigate analytically quantum mechanical (QM) effects on the threshold voltage (VTH ) shift of the surrounding-gate (SG) MOSFETs. We show how VTH is influenced with QM effects with the considerations of (110)-silicon (Si) orientation and (100)-Si orientation. When the radius of an SG MOSFET is small (<3nm), the VTH shift will be significant, and one should be careful in the use of a device with an extremely small silicon body radius. The analytical results are compared with those obtained by B. Yu et al., and good agreement is observed.

关键词： Lead MOSFET circuits

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A New Configurable Logic Block with 4/5-input Configurable LUT and Fast/Slow-Path Carry Chain

A New Configurable Logic Block with 4/5-input Configurable L...

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Zhidong Mao Liguang Chen Yuan Wang Jinmei Lai State Key Lab of ASIC and System Fudan University Shanghai 201203 P. R. China

A new LUT and carry structure embedded in the configurable logic block of FPGA is proposed. The LUT is designed to support both 4-input and 5-input structures, which can be configured by users' according to their needs without increasing the complexity of interconnect structures. We also develop a new carry chain structure with fast and slow carry paths. The circuit is fabricated in 0.13um 1P8M 1.2/2.5/3.3V Logic CMOS technology. The measured results show a correct function of 4/5-input LUT and a speedup in carry performance of nearly 3 times over current architecture.

关键词： FPGA configurable logic block 4/5-input LUT carry chain optimization

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Compensation of Quadrature Imbalance in an Optical Coherent OQPSK Receiver in the presence of Frequency Offset and Phase Drift

Compensation of Quadrature Imbalance in an Optical Coherent ...

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中国光学学会纤维光学与集成光学专业委员会全国第15次光纤通信暨第16届集成光学学术会议

作者： Xinying Li Yufeng Shao Bo Huang Junwen Zhang Shumin Zou Wuliang Fang Li Tao Jiangbo Zhu Nan Chi Department of Communication Science and Engineering State Key Lab of ASIC & System Fudan University Shanghai 200433 China

In this letter, we describe the impact of quadrature imbalance (QI) in the presence of frequency offset and phase drift in an optical coherent offset-quadrature phase-shift-keying (OQPSK) *** the time domain, QI tilts and squeezes the square constellation into a diamond ***' more, frequency offset continuously rotates the *** the presence of both QI and frequency offset, the constellation becomes *** conjugate misalignment was realized in a 2×4 90° optical hybrid, and the Gram-Schmidt orthogonalization procedure (GSOP) was applied in our simulation to compensate for quadrature imbalance in the ***, the GSOP enabled a set of nonorthogonal samples to be transformed into a set of orthogonal ***, a time domain method was adopted to compensate for chromatic dispersion (CD) due to fiber ***, the frequency offset between the received optical signal and LO signal, which was 200MHz in our simulation, was estimated and corrected by the phase increment estimation ***, we recovered the ideal square constellation after carrier phase estimation.

关键词： OQPSK Quadrature imbalance Frequency offset Phase drift

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A BIST Scheme for High-speed Gain Cell eDRAM

A BIST Scheme for High-speed Gain Cell eDRAM

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Bing Yan Yufeng Xie Rui Yuan Yinyin Lin ASIC & System State Key Lab Dept. of Microelectronics Fudan University 825 Zhangheng Rd 201203 Shanghai China

A built-in self-test (BIST) scheme is presented for at-speed test of the novel Gain Cell-based embedded DRAM which can operate at the high frequency of 200MHz. This BIST implementation consists of instruction set architecture (ISA) and hardware. A 4stage pipeline for instruction execution makes atspeed test possible. Various kinds of tests, including single-address test, traversal test and refresh test, can be performed by executing different instruction combinations. An 8KB Gain Cell memory with the BIST is fabricated in 0.13μm CMOS technology. Silicon measurement on ATE shows that the BIST can perform at-speed test and measurement types mentioned above.

关键词： Random access memory Silicon Clocks Built-in self-test Application specific integrated circuits

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A novel method to fabricate full-kerfed highfrequency (>100 MHz) ultrasonic array transducers

A novel method to fabricate full-kerfed highfrequency (>100 ...

引用

2011 IEEE International Ultrasonics Symposium, IUS 2011

作者： Zhang, J.Y. Ji, X.M. Zhou, J. Huang, Y.P. Xu, W.J. Carlier, J. Gao, J.M. Nongaillard, B. ASIC and System State Key Lab. Department of Microelectronics Fudan University Shanghai 200433 China Département Opto-Acousto-Electronique I.E.M.N. Université de Valenciennes Mont Houy BP311 59313 Valenciennes France

ISBN: (纸本)9781457712531

High-frequency ultrasonic transducer arrays are essential for efficient imaging in clinical analysis and nondestructive evaluation (NDE). However, the fabrication of piezoelectric transducers is really a great challenge due to the small features in piezoelectric films. This paper describes a novel technique to fabricate thick-film ZnO ultrasonic array transducers. Piezoelectric elements are formed by sputtering thick-film ZnO onto etched features of a silicon substrate so that the difficult etching process for ZnO films is avoided by etching silicon. This process is simple and efficient. A 13-μm-pitch ZnO sandwich array is achieved with a thickness of 8 μm for 300 MHz. Finite element method is employed to calculate its electrical properties, including electrical impedance and crosstalk. The array is characterized by a network analyzer. The measured results are in good agreement with the theoretical predictions. © 2011 IEEE.

关键词： Thick films

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Wideband Spectrum Sensing using the All-phase FFT

Wideband Spectrum Sensing using the All-phase FFT

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Gerald E. Sobelman Lian Huai Xiaofang Zhou Department of Electrical and Computer Engineering University of Minnesota Minneapolis 55455 USA State Key Lab of ASIC and System Fudan University Shanghai China

Spectrum sensing is a key technology of cognitive radio. The goal of spectrum sensing in this context is to achieve a high detection probability in order to avoid causing interference to the primary licensed users: Among the methods available for spectrum sensing, energy detection has been widely applied in hardware implementations. However, since previous work has been based on the traditional FFT, the side leakage problem makes it difficult to detect a primary user adjacent to a strong signal. In this paper, we propose an all-phase FFT based wideband spectrum sensing processor. Simulation results show that it can increase the probability of detection of a primary user that is adjacent in frequency to a strong signal. It can also improve the receiver operating characteristic curve. Hardware implementation requirements are also given.

关键词： Cognitive radio spectrum sensing all-phase FFT energy detection.

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Optimization of Mixed Polarity Reed-Muller Expressions Based on Whole Annealing Genetic Algorithm

Optimization of Mixed Polarity Reed-Muller Expressions Based...

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Meng Yang Hongying Xu State Key Lab of ASIC & System Fudan University Shanghai 201203 China Tianjin Vocational College of Mechanics and Electricity Tianjin 300131 China

This paper presents a Whole Annealing Genetic Algorithm (WAGA) to obtain a good circuit implementation among mixed polarity Reed-Muller expressions. By combining global searching ability of genetic algorithm and local searching ability of simulated annealing, WAGA could achieve fast convergence. Apart from genetic operators such as crossover operator and mutation operator are used in genetic algorithm stage, it uses annealing operator at annealing stage. At the annealing stage, WAGA forms an intermediate population by selecting 2/3 population from previous generation and 2/3 population from current generation. Annealing operator is then applied to the intermediate population. To achieve an efficient CPU utilization, the calculation of the cost function of WAGA is based on a parallel manner, in which newly generated terms are obtained at one time. The results of tested benchmark show that the algorithm is highly effective for searching the best polarity and achieves 13％ improvement on average in terms of CPU time.

关键词： Annealing Benchmark testing

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A 0.8ps Minimum-Resolution Sub-Exponent TDC for ADPLL in 0.13μm CMOS

A 0.8ps Minimum-Resolution Sub-Exponent TDC for ADPLL in 0.1...

引用

2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Xiaolu Liu Na Yan Xi Tan Hao Min State Key Lab. of ASIC and System Dept. of Microelectronics Fudan University Room 365 825 Road Zhangheng Shanghai China 201203

This paper presents the design of a sub-exponent time-to-digital converter (TDC) that amplifies a time residue to improve both the time resolution and measurement range. The sub-exponent TDC quantizes the fractional time difference with a cascading chain of 2× time amplifiers. A digitally self-calibrated TA circuit is developed to achieve large input range and stable gain. Simulation results show that implemented in SMIC 0.13μm CMOS, the proposed TDC can achieve a minimum resolution of 0.8ps, a measurement range of 14bits, and a power dissipation of 2mW at 60MHz.

关键词： Time-to-digital converter all-digital PLL time amplifier

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A Robust Frame Synchronization Scheme For Broadband Power-line Communication

A Robust Frame Synchronization Scheme For Broadband Power-li...

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Chen Chen Yuebin Huang Yizhi Wang Yun Chen Xiaoyang Zeng State Key Lab. of ASIC and System Dept. of Microelectronics Fudan University Room 220 825 Road ZhangHeng Shanghai China 201203

In this paper, several frame synchronization schemes is examined under the scenario of Broadband Powerline Communication (BPL) with their merits and demerits illustrated. A method, mainly based on algorithm proposed by Minn with modification, is proposed and simulated under channels proposed by Open PLC European Research Alliance (OPERA). Threshold is set according to simulations for frame synchronization as well as Physical Protocol Data Unit (PPDU) identification. The proposed estimator has a RMS (Root Mean Square) of start point estimation three orders lower at least in comparison with legacy Schmidl and Cox estimator. Optimization schemes are also proposed to increase the hardware efficiency for the estimator. As much as 75％ multiplications could be saved with only a slight degradation in estimation accuracy for the proposed estimator.

关键词： Broadband communication

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