San Diego State University 

Department of Electrical and Computer Engineering

Publications

 

 

Journal Papers

 

J20.   Ashkan Ashrafi, “Optimization of the Quantized Coefficients  for DDFS Utilizing Polynomial

           Interpolation Methods”, IEEE Trans. on Circuits and Systems Part-II, Express Briefs

           Vol. 61, No. 2, pp. 105-108, Feb. 2014. (PDF)

J19    Ashkan Ashrafi, “The Frequency Domain Walsh Functions and Sequences: An

          Introduction”, Appl. Comput. Harmon. Anal. Vol. 36, No.2, pp. 348-353, March 2014.

J18.   Ashkan Ashrafi and fredric j. harris, “A Novel Square-Root Nyquist Filter Design with

           Prescribe ISI Energy”, Signal Processing, Vol.93, No. 9, pp. 2626-2635, Sept. 2013 (Link)

J17.    Ashkan Ashrafi Antonio G.M. Strollo, and Oscar Gustafsson, “Hardware Implementation of

           Digital Signal Processing Algorithms”, Editorial, Journal of Electrical and Computer

           Engineering Vol. 2013, Article ID: 782575, June 2013.(PDF)

J16.   Praveen K. Chaurasiya, Ashkan Ashrafi and Santosh Nagaraj, “Novel Spectrally Efficient

           UWB Pulses Using Zinc and Walsh Basis Functions”, The ETRI Journal, Vol 35, No. 3, pp.

           406-413, June 2013. (PDF)

J15.    Ashkan Ashrafi, “Optimized Linear Phase Square-Root Nyquist FIR Filters for CDMA IS-95

           and UMTS Standards”, Signal Processing, Vol. 93, No. 4, pp. 866-873, April 2013. (PDF)

J14.   Tanya T. Nguyen, Ashkan Ashrafi, Jennifer D. Thomas, Edward P. Riley and Roger W.

           Simmons, “Children with Heavy Prenatal Alcohol Exposure have Different Frequency

           Domain  Signal Characteristics when Producing Isometric Force”, Neurotoxicology and

           Teratology Vol. 35, pp. 14-20, Jan.-Feb. 2013. (Link)

J13.   Ashkan Ashrafi, “On The SFDR Upperbound in DDFS Utilizing Polynomial Interpolation

           Methods”, IEEE Trans. on Circuits and Systems Part-II Express Briefs, Vol. 59, No. 5, pp.

           307-311, May 2012. (PDF)

J12.   Ashkan Ashrafi, Reza Adhami and Aleksandar Milenković, “Direct Digital Frequency

           Synthesizers Based on the Quasi-Linear Interpolation Method”, IEEE Trans. on Circuits and

           Systems Part-I, Regular Papers, Vol. 57, No. 4, pp. 863-872, April 2010. (PDF)

J11.    Yuri B. Shtessel, Parisa Kaveh and Ashkan Ashrafi, “Harmonic Oscillator Utilizing Double-

           Fold Integral, Traditional and Second Order sliding Mode Control,” Journal of The Franklin

           Institute, Vol. 346, No.9, pp. 872-888, Nov. 2009.

J10.   Ashkan Ashrafi and Reza Adhami, “Theoretical Upperbound of the Spurious Free Dynamic

           Range in Direct Digital Frequency Synthesizers Realized by Polynomial Interpolation

           Methods”, IEEE Trans. on Circuits and Systems Part-I, Regular Papers, Vol. 54, No. 10, pp.

           2252-2261, Oct. 2007. (PDF)

J9.     Peter Meenen, Ashkan Ashrafi, and Reza Adhami, “The Utilization of a Taylor Series-Based

           Transformation in Fingerprint Verification,” Pattern Recognition Letters, Vol. 27, No.14, pp.

           1606-1618, October 2006. (PDF)

J8.     Ashkan Ashrafi and Reza Adhami, “Comments on ‘A 13-Bits Resolution ROM-Less Direct

           Digital Frequency Synthesizer Based on a Trigonometric Quadruple Angle Formula’,” IEEE

           Transactions on Very Large Scale Integration (VLSI) Systems, Vol.13, No.9, pp. 1096-1098,

           Sept. 2005. (PDF)

J7.     Ashkan Ashrafi and Peter M. Gibson “Eigenvalues of Hadamard powers of large symmetric

           Pascal matrices”, Linear Algebra and its Applications, Vol. 405, pp. 60-66, August 2005.

           (PDF)

J6.     Ashkan Ashrafi and Peter M. Gibson “An involutory Pascal matrix”, Linear Algebra and its

           Applications, Vol 387, pp. 277-286, August 2004. (PDF)

J5.     Ashkan Ashrafi, Reza Adhami, Laurie Joiner and Parisa Kaveh, "Arbitrary Waveform DDFS

           Utilizing Chebyshev Polynomials Interpolation", IEEE Transactions on Circuits and Systems

           Part-I, Regular Papers, Vol 51, No.8, pp. 1468-1476, August 2004. (PDF)

J4.     Ashkan Ashrafi and Hossein Golnabi, "A High Precision Method for Measuring Very Small

           Capacitance Changes", Rev. of Sci. Instrum., Vol. 70 (8), pp. 3483-87, August 1999. (PDF)

J3.     H. Golnabi and A. Ashrafi, "Phase Shift Generation and Monitoring by a Simple Circuit",

           Rev. of Sci. Instrum., Vol. 76 (5), pp. 2017-2019, 1996.(PDF)

J2.     H. Golnabi and A. Ashrafi, "Producing 180° out of Phase Signals from an Input Sinusoidal

           Waveform", IEEE Transactions on Instrum. and Meas., Vol. 45, No.1, pp. 312-314, Feb. 1996.

           (PDF)

J1.      H. Golnabi and A. Ashrafi, "Theoretical Studies of Electrical Characteristics of the Nitrogen

           Laser", Journal of Engineering, IR Iran, Vol.7, No.3, pp. 143-153, August 1994.

 

 

Conference Papers

 

C14.   Ujjal Bhowmik, A. Ashrafi, and Reza Adhami “A Fingerprint Verification Algorithm Using

           the Smallest Minimum Sum of Closest Euclidean Distance”, Proc. of the 19th International

           Conference on Electronics, Communications and Computers, CONIELECOMP 2009, pp.

           90-95, May 2009.(PDF)

C13.   A. Ashrafi, and Sudheep Thota, “A Novel Pre-Truncated Fixed-Width Digital Squarer”, Proc.

           of the IEEE 2008 Midwest Symposium on Circuits and Systems MWSCAS-2008, pp.

           959-961, August 2008.(PDF)

C12.   A. Ashrafi, A. Milenkovic and R. Adhami, “A 1GHz Direct Digital Frequency Synthesizer

           Based on the Quasi-Linear Interpolation Method”, Proc. of the IEEE International

           Symposium on Circuits and Systems ISCAS-2007, May 2007.(PDF)

C11.   A. Ashrafi and R. Adhami, “An Optimized Direct Digital Frequency Synthesizer Based on

           Even Fourth Order Polynomial Interpolation,” Proc. of the IEEE 38th Southeastern

           Symposium on System Theory, pp. 109-113, March 2006.(PDF)

C10.   A. Ashrafi and R. Adhami, “A Direct Digital Frequency Synthesizer Utilizing Quasi-Linear

           Interpolation Method,” Proc. of the IEEE 37th Southeastern Symposium on System Theory,

           pp. 144-148, March 2005.(PDF)

C9.     P. Kaveh, A. Ashrafi and Y. Shtessel, “Robust Sliding Mode Harmonic Oscillator Suitable for

           Low Frequencies,” Proc. of the IEEE 37th Southeastern Symposium on System Theory, pp.

           249-252, March 2005.(PDF)

C8.     P. Kaveh, A. Ashrafi, Y. Shtessel, “Integral and Second Order Sliding Mode Control of

           Harmonic      Oscillator”, Proc. of the 44th IEEE Conference on Decision and Control and

           European Control Conference (CDC-ECC’05), pp. 3941 – 3946, December 2005.(PDF)

C7.     P. Kaveh, A. Ashrafi and Y. Shtessel, “Robust Harmonic Oscillator Control via Integral and

           High Order Sliding Modes”, Proc. of the 8th International Workshop on Variable Structure

           Systems (VSS'04).

C6.     Ashkan Ashrafi, Zexin Pan, Reza Adhami and B. Earl Wells, “A Novel ROM-less DDFS

           Based on Chebyshev Polynomial Interpolation”, Proc. of IEEE 36th Southeastern Symposium

           on System Theory, pp. 393-397, March 2004.(PDF)

C5.     Ashkan Ashrafi, Reza Adhami and Paul Cox, “A Simple Wide-Band Frequency Independent

           Quadrature Phase Shifter”, Proc. of IEEE 34th Southeastern Symposium on System Theory,

           March 2002.(PDF)

C4.     Hossein Golnabi, A. Ashrafi and Habib. Golnabi, "Fiber Optic Sensing of Displacement and

           Pressure", Proceedings of the 6th International Conference on Flexible Automation and

           Intelligent Manufacturing (FAIM'96), Begell House, New York, pp. 149-158, 1996.

C3.     H. Golnabi and A. Ashrafi, "Design and Construction of a Reliable Fiber Optic Sensor", Proc.            of the 5th International Conference on Flexible Automation and Intelligent Manufacturing            (FAIM'95), Begell House, New York, pp. 910-917, 1995.

C2.     H. Golnabi and A. Ashrafi, "Theoretical and Experimental Investigation of a Computer-

           Controlled Angle Tuning System", Proc. of the 4th International Conference on Flexible

           Automation and Integrated Manufacturing (FAIM'94), Begell House, New York, pp.

           834-843, 1994.

C1.     H. Golnabi and A. Ashrafi, "The Role of Sensor Systems in Automated Manufacturing", Proc.

           of the 4th International Conference on Flexible Automation and Integrated Manufacturing

           (FAIM'94), Begell House, New York, pp. 646-654, 1994.

 

Poster Presentations

 

PO1    Roger W. Simmons, Ashkan Ashrafi, Tanya T. Nguyen, Susan S. Levy, Jennifer D. Thomas,

           Edward P. Riley.  “Frequency response characteristics of isometric force regulation in

           children with prenatal alcohol exposure”, Society for Neuroscience, San Diego Nov. 2010.

 

Patents

 

P4.    Kee Moon, Khaled Morsi, Ashkan Ashrafi and Yusuf Ozturk, “Apparatus and methods for low-

          artifact biopotential sensing with electrolyte gel-impregnated porous Ag/AgCl dry electrodes

          for wireless mobile signal acquisition”, Disclosed to the SDSU Technology Transfer Office.

P3.    Ashkan Ashrafi, “Optimized Linear-Phase Square-Root Nyquist FIR Filters for CDMA IS-95

          and UMTS Standards”, Disclosed to the SDSU Technology Transfer Office.

P2.    Ashkan Ashrafi, “Rectangular Power Densities of Orthogonal Functions”, United States

          Patent Application, US 2012/0120787 A1, May 17th, 2012.

P1.     Ashkan Ashrafi and Reza Adhami, “Direct Digital Frequency Synthesizer with Phase

          Selectable Interpolator” United States Patent Application 20080298527.

 

Tutorials

 

T1       Amith Dharwadkar and Ashkan Ashrafi, “Cadence Tutorial” (PDF)

T2      Mark Sison Manalo and Ashkan Ashrafi, “Tutorial: Xilinx Virtex-5 FPGA ML506 Edition”.

           (PDF)

T3      Mark Sison Manalo and Ashkan Ashrafi, “Implementing Filters on FPGA” (PDF)

T4      Mark Sison Manalo and Ashkan Ashrafi, “USB Interfacing and Real-Time Data Plotting with

           MATLAB” (PDF)

T5      Colin Fera, Matthew Luscher and Ashkan Ashrafi, “Virtex-6 ML605 Development Board

           With  4‐DSP FMC-150 ADC/DAC”. (PDF)