scholarly journals Digital Implementation Method of Base-band Signal of FSK Quadrature Modulation

2012 ◽  
Author(s):  
Jinyu Bao ◽  
Kaiyu Qin ◽  
Bo Tang ◽  
Honglin Dou
Keyword(s):  
Quadrature Modulation ◽  
Digital Implementation ◽  
Implementation Method ◽  
Base Band ◽  
Band Signal

scholarly journals A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band

2005 ◽  
Vol 23 (1) ◽  
pp. 39-46
Author(s):  
◽  
La Hoz ◽  
◽  
Keyword(s):  
Radar Data ◽  
Center Frequency ◽  
Digital Receiver ◽  
The Real ◽  
Incoherent Scatter ◽  
Singular Region ◽  
Analysis Strategies ◽  
Relative Delay ◽  
Base Band ◽  
Band Signal

Abstract. The real and imaginary parts of baseband signals are obtained from a real narrow-band signal by quadrature mixing, i.e. by mixing with cosine and sine signals at the narrow band's selected center frequency. We address the consequences of a delay between the outputs of the quadrature mixer, which arise when digital samples of the quadrature baseband signals are not synchronised, i.e. when the real and imaginary components have been shifted by one or more samples with respect to each other. Through analytical considerations and simulations of such an error on different synthetic signals, we show how this error can be expected to afflict different measurements. In addition, we show the effect of the error on actual incoherent scatter radar data obtained by two different digital receiver systems used in parallel at the EISCAT Svalbard Radar (ESR). The analytical considerations indicate a procedure to correct the error, albeit with some limitations due to a small singular region. We demonstrate the correction procedure on actually afflicted data and compare the results to simultaneously acquired unafflicted data. We also discuss the possible data analysis strategies, including some that avoid dealing directly with the singular region mentioned above.

A New Chaotic Attractor and its Digital Implementation Based on LabVIEW

2013 ◽  
Vol 278-280 ◽  
pp. 54-57
Author(s):  
Hong Yang
Keyword(s):  
Chaotic System ◽  
Equilibrium Points ◽  
Three Dimensional ◽  
Theoretical Simulation ◽  
Digital Implementation ◽  
New Chaotic System ◽  
Quadratic Nonlinearities ◽  
External Conditions ◽  
New Chaotic Attractor ◽  
Implementation Method

In this paper, a novel three-dimensional autonomous chaotic system with six terms and two quadratic nonlinearities is presented. Some basic dynamical properties of the new chaotic system are analyzed by means of equilibrium points, eigenvalue structures, Lyapunov exponent and Lyapunov dimension. In order to overcome the external conditions affected by the analog circuit’s chaotic system, digital implementation of the new chaotic system based on LabVIEW is also proposed. The results show that the experimental results by LabVIEW are consistent with the theoretical simulation results by Matlab, and the method is an effective digital implementation method.

Design and Implementation of Multi-Frequency Digital Receiver Based on FPGA

2014 ◽  
Vol 643 ◽  
pp. 117-123
Author(s):  
Yu Peng Liu ◽  
Chao Du ◽  
Dong Lin Liu
Keyword(s):  
Digital Technology ◽  
Wide Band ◽  
Radar System ◽  
Center Frequency ◽  
Beam Forming ◽  
Digital Receiver ◽  
Effective Implementation ◽  
Great Performance ◽  
Implementation Method ◽  
Band Signal

Recently, the concept of software radar has been proposed. The wide application of the digital technology has become a trend. With the development of modern radar system, the system requires higher and higher performance to the radar receiver. The technology of digital receiver has become an effective implementation method for high-accuracy and wide-band radar receiving systems. However, most of the digital receiver can only receive one wide-band signal with one center frequency. A multi-frequency digital receiver which can receive several center frequencies of signal simultaneously [1] is discussed in this paper. We also describe the theory and the design about digital receiver, introduce digital downconversion (DDC), FIR and decimation, digital beam forming and channel calibration. Based on the research, a realization of multi-frequency digital receiver based on FPGA is put forward. The analysis and simulation is made and the result shows the design of great performance.

scholarly journals Base-band Signal Processing of Narrow MUSE.

1991 ◽  
Vol 45 (6) ◽  
pp. 737-746
Author(s):  
Seiichi Gohshi ◽  
Makoto Tadenuma ◽  
Minoru Honda ◽  
Kiyotaka Okada ◽  
Kazumasa Enami
Keyword(s):  
Signal Processing ◽  
Base Band ◽  
Band Signal

Development of SAR base-band signal processor using FPGA and onboard PC

2014 ◽  
Author(s):  
Kyohei Suto ◽  
J. T. Sri Sumantyo ◽  
V. C. Koo ◽  
M. Y. Chua ◽  
W. G. Cheaw
Keyword(s):  
Base Band ◽  
Band Signal ◽  
Signal Processor

An Improved Re-Sampling Interpolation Algorithm for Base-Band Signal Shaping Filtering

2012 ◽  
Vol 195-196 ◽  
pp. 205-211
Author(s):  
Wei Qi ◽  
Qing Chang ◽  
Lv Qian Zhang ◽  
Yuan Yu
Keyword(s):  
Spread Spectrum ◽  
Communication Systems ◽  
Dynamic Environment ◽  
Software Radio ◽  
Wireless Communication Systems ◽  
Interpolation Filter ◽  
Shaping Filter ◽  
Band Power ◽  
Base Band ◽  
Band Signal

Research on shaping filtering algorithms in wireless communication systems has important practical value. Based on the digital base-band shaping filter, which is widely used in the area of software radio, an improved re-sampling filtering algorithm is proposed in this paper. By the design of truncated raise cosine filter, the continuous sequence of digital spread-spectrum signal can be restored. The piecewise parabola interpolation filter is established to carry out the signal re-sample, and the Farrow implementation structure is adopted to reduce the calculation cost. The algorithm is validated through the experiment using simulated and true signals respectively, which demonstrate that not only the out band power of frequency division multi signals can be effectively suppressed, but also the steadiness of re-sampling signals is improved during the dynamic environment.

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