Performance Of IEEE 802.11 OFDM With Multiple Frequency Transforms And Pulse Shaping Schemes

Tulsi Pawan Fowdur, Urvashee Goburdhun, Pallashika Jhengree


Orthogonal Frequency Division Multiplexing (OFDM) is employed in various communication systems such as the IEEE 802.11 wireless standards, in which both frequency transform, Fast Fourier Transform (FFT) and pulse shaping filter, Square Root Raised Cosine (SRRC) are used. The main contribution of this paper is the analysis of the performance of different combinations of frequency transforms and pulse shaping schemes for the 802.11n standard. The frequency transforms which have been used are: Fast Fourier Transforms (FFT), Discrete Wavelet Transforms (DWT) and Discrete Hartley Transform (DHT). The pulse shaping filters are the Raised Cosine (RC), SRRC and Flipped Exponential Pulse (FEXP). The IEEE 802.11 WLAN system with Additive White Gaussian (AWGN) has been used as the modelling environment. The results showed that the DWT-based OFDM system has a better performance than the DHT and FFT schemes and upon comparing the pulse shaping filters, the SRRC filter outperforms the FEXP and RC filters.

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R. Prasad, OFDM for wireless communications systems (1st ed), Boston: Artech House, 2004.

H. Nyquist, “Certain topics on telegraph transmission theory,” Trans. AIEE, vol. 47, no. 2, pp. 617-644, 1928.

IEEE Std 802.11a, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - High-speed Physical Layer in the 5 GHz Band,” IEEE, 1999

3G TS 25.104., “3rd generation partnership project: technical specification group radio access networks,” BS radio transmission and reception (FDD), V4.4.0., 2002.

3GPP TR 25.814 V7.0.0., “Physical layer aspects for evolved UTRA,” Tech. Rep, 2006

K.P Nagapushpa and K.N Chitra. “Studying Applicability Feasibility of OFDM in Upcoming 5G Network.” (IJACSA) International Journal of Advanced Computer Science and Applications, Vol. 8, No. 1, pages 216-220, 2017

M.V Eeckhaute, A. Bourdoux, P. De Doncker and F. Horlin, “Performance of emerging multi-carrier waveforms for 5G asynchronous communications”, EURASIP Journal on Wireless Communications and Networking, pages 2-7, 2017 [8] S.A. Adegbite and McMeekin, G. Scott and Stewart, G. Brian, “A low complexity SI sequence estimator for pilot-aided SLM–OFDM systems,” AEÜ - International Journal of Electronics and

Communications Archiv für Elektronik und Übertragungstechnik, 70 (9). 1267–1274. ISSN 1434-8411, pages 20-25, 2016.

R. Bodhe, S. Joshi and S. Narkhede, “Performance Comparison of FFT and DWT based OFDM and Selection of Mother Wavelet for OFDM,” International Journal of Computer Science and Information Technologies, vol. 3, no. 3, pp. 3993-3997, 2012.

S. Kumar and P. Tanwar, “Removal of cyclic prefix in Adaptive Non- Contiguous OFDM for Dynamic Spectrum Access using DWT and WT,” International Journal of Advanced Computer Research, vol. 2,

no. 3, pp. 40-44, 2012.

K. Trivedi, A. Khare and S. Dixit, “Ber Performance of OFDM with

Discrete Wavelet Transform for Time Dispersive Channel,”

International Journal of Research in Engineering and Technology,

vol. 03, no. 10, pp. 152-155, June 2014.

R. Asif, R. A. Abd-Alhameed, O. Anoh and Y. Dama, “Performance

Evaluation of DWT-FDM and FFT-OFDM for Multicarrier

Communications Systems using Time Domain Zero Forcing

Equalization,” Communications on Applied Electronics (CAE), vol.

, no. 1, pp. 1-5, 2014.

A. Deshmukh and S. Bodhe, “Comparison of DCT and Wavelet

Based OFDM System Working in 60 GHz Band,” International

Journal of Advancements in Technology, vol. 3, no. 2, pp. 74-83,

A. Kumar, S. Singh and Shashank, “Performance Comparison of

FFT, DHT and DCT Based OFDM Systems with BPSK as A Modulation Technique,” International Journal of Recent Research in Electrical and Electronics Engineering, vol. 2, no. 2, pp. 48-54, 2015.

N.C. Beaulieu, C.C. Tan, and M.O. Damen, (2004). “A „better than‟ Nyquist pulse,” IEEE Commun. Lett, vol. 5, pp. 367–368, 2004.

D.K. Sharma, A. Mishra, and R. Saxena, “Effect of Pulse Shaping On Ber Performance of QAM Modulated OFDM Signal,” TECHNIA – International Journal of Computing Science and Communication Technologies, vol. 4, no. 2, 2012.

N. Kaur, and V.K. Banga, “Effects of Filtering on the BER Performance of an OFDM System,” IJRET: International Journal of Research in Engineering and Technology, vol. 2, no. 9, 2013.

P. Xiao, C. Toal, D. Burns, V. Fusco, and C. Cowan, “Transmit and receive filter design for OFDM based WLAN systems,” IEEE International Conference on Wireless Communications and Signal Processing (WCSP), 2010.

A. Mohammad, B. Abdelhamid, I.M. Hafez, “A New Linearly Combined Nyquist Pulses for PAPR Reduction in IFDMA,” International Journal of Computer Applications, vol. 126, no. 6, pp. 38-43, 2015

T.P. Fowdur and P. Jhengree, “Enhanced Pulse Shaping Filters for IEEE 802.11 OFDM,” JEEECCS: Journal of Electrical Engineering, Electronics, Control and Computer Science, vol. 3, no. 7, pp. 21-28, 2017

Z. Zhao, M. Schellmann, X. Gong, Q. Wang, R. Böhnke and Y. Guo. Pulse shaping design for OFDM systems, EURASIP Journal on Wireless Communications and Networking, pages 1-9, 2017

J. G. Proakis and D. Manolakis, “The Discrete Fourier Transform: Its Properties and Applications,” in Digital Signal Processing: Principles, Algorithms and Applications, (3rd ed.), United States of America, Prentice Hall International, pp. 394-400, 1996.

A. Graps, “An Introduction to Wavelets,” IEEE Computational Sciences and Engineering, vol. 2, no. 2, pp. 50-61, 1995.

Mathsworks, “Single-level discrete 1-D wavelet transform,” The Mathsworks, Inc, 1994-2017. [Online]. Available: [Accessed 31 March 2017].

Mathsworks, “Single-level inverse discrete 1-D wavelet transform,” The Mathsworks, Inc, 1994-2017. [Online]. Available: [Accessed 31 March 2017].

Y. Sheng, (2000). The Transforms and Applications Handbook (2nd ed). Boca Raton: CRC Press LLC, 2000.

S. Sharma and S. Kumar, (2011). “BER Performance Evaluation of FFT-OFDM and DWT-OFDM,” International Journal of Network and Mobile Technologies, vol. 2, pp. 110-116, 2011

M. Viswanathan, “Simulation of Digital Communication Systems using Matlab,” Smashwords, 2013.


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