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检索条件"主题词=CORDIC Algorithm"

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A 200MHz Low-Power Direct Digital Frequency Synthesizer Based on Mixed Structure of Angle Rotation

A 200MHz Low-Power Direct Digital Frequency Synthesizer Base...

引用

2009 IEEE 8th International Conference on ASIC(ASICON 2009)

作者： Wan Shuqin *,Huang Yiding,Zhang Kai-hong,Yu Zongguang

Direct digital frequency synthesizer(DDS) is a new technology for frequency *** paper describers the implementation of a direct digital frequency employs a new architecture in 0.35μm CMOS *** first rotation implementer by using a cordic realized in pipeline and carry-save *** directions of the cordic rotations are computed in parallel by using a little lookup table,for the first *** order to reduce the circuit latency and increase the speed,the final rotation is multiplierbased,employing CMOS-DPL *** final circuit experiment results show the power dissipation as low as.44mW/MHz and the maximum clock frequency 200 MHz

关键词： Direct digital frequency synthesizer (DDFS) cordic algorithm pipeline angle rotation

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A fixed point of DFT/FFT for FPGA Platform

A fixed point of DFT/FFT for FPGA Platform

引用

2012 IEEE International Conference on Computer Science and Automation Engineering（CSAE 2012）

作者： Qi Xu Department of Electronics Engineering Northwestern Polytechnical University Xi’an,china ZheMing Duan Department of Electronics Engineering Northwestern Polytechnical University Xi’an,china

In this paper,the Pipelined Streaming butterfly stage of DFT/FFT is designed including cordic and complex algorithm to increase the *** butterfly stage is full use of the register of DSP to transform the complex quantity to the simple Pipelined algorithm and the iteration of cordic to compute the *** butterfly stage not only save the resources,but also increase the accuracy of *** simulation show that the butterfly stage is highly the efficiency of compute,accuracy and range.

关键词： component formatting DFT/FFT cordic algorithm butterflies

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Design and Implementation of Improved NCO based on FPGA

Design and Implementation of Improved NCO based on FPGA

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作者： Yanshuang Chen Jun Yang School of Information Science and Engineering Yunnan University

A numerically controlled oscillator(NCO) is used to generate quadrature controllable sine and cosine waves and is an important part of software *** traditional NCO module is implemented based on the lookup table structure,which requires a large amount of hardware storage resources inside the ***,the cordic algorithm is used to implement the NCO module,and the output accuracy is improved by improving the cordic *** the same time,the FPGA technology is characterized by strong reconfigurability,good scalability,low hardware *** module is designed with Verilog HDL ***,the NCO model based on FPGA design has the characteristics of low hardware resource consumption and high output *** model was simulated by Modelsim and downloaded to the target chip verification of Altera DE2's EP2 C35 F672 *** digitally controlled oscillator met the design requirements.

关键词： Digital controlled oscillator (NCO) cordic algorithm Pipeline structure FPGA precision

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An Improved SCS algorithm Based on LINC Transmitter

An Improved SCS Algorithm Based on LINC Transmitter

引用

2010 3rd IEEE International Conference on Computer Science and Information Technology—ICCSIT 2010

作者： Qing Wang,Ziming Zhong School of Electronic Engineering University of Electronic Science and Technology of China Chengdu,China Xiang Lin College of Computer Science Sichuan University Chengdu,China

This paper proposes an improved signal component separation(SCS) method to solve the non-constant envelop modulated signals through traditional SCS in LINC(Linear Amplification With Nonlinear Components) *** basic idea of this algorithm is to analyze the angle between adjacent signals,then adopting the method which can improve the signal peak to average power ratio(PAPR) and introducing the idea of "keep and go",to minimize envelope mutations caused by the errors from cordic algorithm processing,so that the ideal signal envelope can be *** experimental simulation demonstrated the effectiveness and feasibility of this *** signal PAPR can be reduced to 0.0010dB through data from experimental measurements,which is more convenient for linear power amplifier design.

关键词： signal component separation cordic algorithm amplitude and phase separation constant envelop envelop mutations

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Ultrasonic Phased Array Nondestructive Testing System Based on FPGA 20

Ultrasonic Phased Array Nondestructive Testing System Based ...

引用

Proceedings of the 2020 4th International Conference on Electronic Information Technology and Computer Engineering

作者： Fenxian Tian Juan Li Jun Yang School of Information Science and Engineering/Yunnan University Kunming China

ISBN: (纸本)9781450387811

In ultrasonic phased array nondestructive testing system, cordic is used to optimize the algorithm of key function calculation or data processing in ultrasonic phased array instrument. This paper focuses on the research of ultrasonic phased array FPGA signal processing technology based on cordic algorithm, focusing on the ultrasonic echo orthogonal demodulation technology, dynamic FIR filtering technology, time gain control technology. It can reduce the hardware complexity of ultrasonic phased array instrument system, speed up the detection speed and improve the detection accuracy. After the system comprehensive test, the ultrasonic phased array system designed in this paper meets the requirements of industrial application.

关键词： Quadrature demodulation Dynamic filtering Gain control Ultrasonic phased array cordic algorithm

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Waveform generator for RADAR using FPGA

Waveform generator for RADAR using FPGA

引用

IEEE International Conference on Recent Trends in Electronics, Information & Communication Technology

作者： Avilash Sawant Shilpa Patil K. Aurobindo Department of Electronics Engineering Fr. Conceicao Rodrigues College of Engineering Scientist D Atmospheric Radar and Instrumentation Division SAMEER IIT Powai

ISBN: (数字)9781538624401

ISBN: (纸本)9781538624418

This paper presents a design of waveform generator, in which Radio Detection and Ranging (RADAR) waveforms are generated using Direct Digital Frequency Synthesizer (DDFS) technology and implemented on Field Programmable Gate Array (FPGA). DDFS is designed using Coordinate Rotational Digital Computer (cordic) algorithm whose output amplitude has accuracy up to 5 decimal places. It has good resolution and better utilization of resources in a device which reduces overall system hardware size and cost. Proposed waveform generator has maximum output up to 2 MHz from reference clock frequency 27MHz.

关键词： cordic algorithm Direct digital frequency synthesizer Spartan 6 FPGA RADAR waveforms waveform generators Field programmable gate arrays radar Resource utilization DDFS maximum output

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FPGA-based Optical Distortion Correction for Imaging Systems

FPGA-based Optical Distortion Correction for Imaging Systems

引用

2006 8th International Conference on Signal Processing

作者： Lin Qiang Nigel M Allinson Department of Electronic and Electrical Engineering The University of Sheffield Mappin StreetSheffieldS1 3JDUK

A novel algorithm for correcting optical spatial distortion in imaging systems is presented,together with the architectures implemented for FPGA-based *** coordinate transformation functions generally require square root and trigonometric functions,which are not easily calculated using FPGA hardware,the CORD1C(Coordinate Rotation Digital Computer) algorithms are employed for these function *** effective pipelined implementation for the radius correction is also *** hardware architecture of the spatial correction algorithm has been targeted successfully on a Xilinx Spartan 3 device using the minimum of *** experimental results show that the pincushion distortion correction algorithms produce a very low residual error.

关键词： Spatial optical distortions pincushion distortion barrel distortion cordic algorithm FPGA hardware implementation

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Implementation of Frequency Domain Equalizer for Single Carrier Transmission

Implementation of Frequency Domain Equalizer for Single Carr...

引用

The 4th International Conference on Wireless Communications, Networking and Mobile Computing(第四届IEEE无线通信、网络技术及移动计算国际会议)

作者： Tadashi TAKAGI Suguru KAMEDA Valentin GHEORGHIU Fumiyuki ADACHI Kazuo TSUBOUCHI Research Institute of Electrical Communication Tohoku University Katahira 2-1-1 Aoba-ku Sendai 980 Dept.of Electrical and Communications Engineering Graduate School of Engineering Tohoku University 6

Single-carrier (SC) transmission using frequency domain equalization (FDE) based on the minimum mean square error (MMSE) criterion is an efficient way to combat the effects of frequency selective fading. In this paper, we discuss several key aspects concerning the implementation of a frequency domain equalizer and propose a feasible design. One of the problems is the implementation of the division operator used to compute the equalization weights. The cordic algorithm was employed for this as it reduces the hardware overhead. The proposed design was implemented in a FPGA and the performance was evaluated through experimental data.

关键词： Single-carrier implementation FPGA cordic algorithm

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Design of Non-Coherent CSS Communication Method for Highly Dynamic Scenes

Design of Non-Coherent CSS Communication Method for Highly D...

引用

2015 International Conference on Computer Information Systems and Industrial Applications(CISIA2015)

作者： Z.G.Sun X.Y.Ning Y.S.Zheng Z.M.Chen College of Information and communication Engineering Harbin Engineering University Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory

ISBN: (纸本)9781510805750

High-speed mobile wireless communication system always goes through the doubly selective wireless fading channels,which seriously affects the performance of communication *** this paper,a non-coherent chirp spread spectrum（CSS） communication method is proposed based on cordic algorithm and differential frequency *** to the Doppler shift caused by constant and variable speed on the CSS communication method,an inner symbol differential decider is introduced to counteract the Doppler shift in highly dynamic *** the situation of 4MHz carrier frequency and bit error rate less than 10,computer simulation shows that the proposed method based on cordic differential discriminator has a maximum resistance of Doppler shift up to about 150 kHz,which is much larger than the coherent method's 30 Hz.

关键词： CSS communication cordic algorithm Doppler shift

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The Design of NCO Built in Ultra High-Speed Data Converter

The Design of NCO Built in Ultra High-Speed Data Converter

引用

International Conference on Electronics Technology (ICET)

作者： Zehua Zhu Haiyang Quan Ling Tian Tieliang Zhang Xinmang Peng Lei Zhang Beijing Microelectronics Technology Institute Beijing China

ISBN: (数字)9781728162836

ISBN: (纸本)9781728162843

At present, digital domain signal modulation mainly uses digital orthogonal frequency conversion technology. Digital frequency conversion technology is one of the core technologies of digital radar, electronic countermeasures, software radio and other technologies. The sine and cosine local oscillator signals in a modulation system are very important for digital up-conversion systems. Therefore, the design of high-performance NCO becomes a design difficulty of the modulation system. This paper proposes an NCO design based on the cordic algorithm in a 16-bit 12GSPS DAC.

关键词： NCO cordic algorithm phase accumulator amplitude NEPA COMPLIANCE OFFICERS Amplitude Key technology high speed data Frequency conversion

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