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Ehsan Rohani
M.Sc. Electronic Engineering School of Electrical and Computer Engineering University of Tehran, 14395-515, Iran
Tel: +9821 44242441
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Ehsan Rohani
M.Sc. Electronic Engineering School of Electrical and Computer Engineering University of Tehran, 14395-515, Iran
Tel: +9821 44242441
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Short Biography:
He was born in Tehran, on 2 June 1981. He has received his diploma in Shahid Beheshti (nodet) pre Univ., Sari, Iran, on June 1999. He has received his B.Sc. in Electronic Engineering, in EE dept., Univ. of AmirKabir Tehran, Iran. He has received his M.Sc. in Electronic Engineering, ECE dept., Univ. of Tehran, Iran.
Education :
Research Interests:
My research interests lie in the area of wireless data transmission based on IEEE 802.16 standard (Base-Band and Bit-True modeling).
Research and Work Experience:
2003 - Now: Research Assistant, Silicon Intelligence Lab., School of ECE, University of Tehran, Iran.
Study and optimum implementation of IEEE802.16 Standard.
Publications:
Journal paper(s)
E. Rohani, S.M. Fakhraie, "Round-off error in block-floating-point structures", Electronics Letters, Volume 42, Issue 3, 2 Feb. 2006 Page(s): 186 – 187 [download].
Conference paper(s)
Ehsan Rohani, S. Mehdi Fakhraie, "Reducing Round-off Error in an ADSL Modem with Block-Floating-Point Structure", IST2005, Sept. 2005 P. 623-627 [download].
N. Moezzi-Madani, E. Rohani, S. M. Fakhraie, " Hardware Considerations for Digital Audio Broadcasting System" ,The 17th International Conference on Microelectronics, 13-15 Dec. 2005 P. 209 – 212 [download].
امير علي شيرازي بهشتي، احسان روحاني، كمال عبدي، علي افضلي كوشا، "مدل اصلاح شده توان آلفا براي ترانزيستورهاي MOS" سيزدهمين كنفرانس مهندسي برق ايران، 20 تا 22 ارديبهشت 1384، دانشگاه زنجان، صفحه 79 تا 82.
Presentations:
Oral:
Ehsan Rohani, S. Mehdi Fakhraie, "Reducing Round-off Error in an ADSL Modem with Block-Floating-Point Structure", IST2005, Sept. 2005 P. 623-627 [download].
N. Moezzi-Madani, E. Rohani, S. M. Fakhraie, " Hardware Considerations for Digital Audio Broadcasting System" ,The 17th International Conference on Microelectronics, Volume , Issue , 13-15 Dec. 2005 P. 209 – 212.
امير علي شيرازي بهشتي، احسان روحاني، كمال عبدي، علي افضلي كوشا، "مدل اصلاح شده توان آلفا براي ترانزيستورهاي MOS" سيزدهمين كنفرانس مهندسي برق ايران، 20 تا 22 ارديبهشت 1384، دانشگاه زنجان، صفحه 79 تا 82.
M.Sc. Thesis Abstract:
By the spreading of the use of personal computers and increasing the use of Internet and the need to provide fast and robust connections, the Broadband Wireless Access (BWA) systems are growing rapidly. For inter working between different equipments of various manufactures, IEEE released the standard 802.16. Later after around one year, the second edition of the standard, 802.16a for multipath channels was released. In this thesis, we first present a float model for OFDM part of PHY layer of the standard. This part has been chose as the mandatory structure for WiMAX. After that, we present a bit-true model with the aims of having less than 0.5 dB degradation in the performance of the system and minimizing the hardware cost of it. Since the most sensitive modulation of the standard is 64QAM and the rate 5/6 for convolution coding, for bit-true modeling, we have first considered that all of the system blocks are float and we have made only one of them bit-true at a time and have tuned the system to satisfy all of the limits which are considered by the standard and the condition of at most 0.5 dB degradation in the performance. Finally, the SNR of each block can be used for each hardware realization structure (fixed or float) to obtain a system with at most 0.5 dB degradation in performance due to implementation. Also samples of the input and output data of each block in the float model can be used as a test bench for the same hardware structure. In the final design, IFFT in the transmitter is implemented with 12 bits. In the receiver, 11 bits are used for FFT block. An 8 bits ADC is used in the receiver.