Effect of Doppler Shift frequency on the performance of 2x2 OSTBC-OFDM System

المؤلفون

  • Diana Hayder Hussein Information System Engineering Department, Technical Engineering College, Polytechnic University, Kurdistan-Iraq (Part time Lecturer at Lebanese French University)
  • Thuraya Mahmood Qaradaghi Electrical Engineering Department, College of Engineering, Salahaddin University, Kurdistan-Iraq

DOI:

https://doi.org/10.25212/lfu.qzj.2.2.24

الكلمات المفتاحية:

MIMO, Doppler shift, OFDM, OSTBC, Rayleigh Fading Channel, Convolutional code

الملخص

In this paper the effect of the Doppler shift frequency on the performance of the 2x2 MIMO system has been studied and presented. A system with two transmits antennas and two receive antennas has been used. Accurate and efficient channel estimation which plays a key role in MIMO-OFDM communication system has been implemented using pilots and training sequences. To guarantee a much more reliable and robust transmission over a hostile wireless channel, a convolutional codes have been added to the 2x2 MIMOOSTBC-OFDM system as a Forward Error Correction (FEC) codes. Two types of convolutional code rate have been used (1/2 and 2/3) depending on the type of modulation. To make this code more robustness against channel impairments; interleaving has been used with the convolutional code. The system has been evaluated for four types of QAM modulation (4-QAM, 8-QAM, 16-QAM, and 64-QAM) as a baseband modulation. The system has been evaluated for three different values of Doppler Shift frequency (5, 50, and 100) Hz. The simulation results demonstrated the performance of the systems over Flat and multi-path Frequency-Selective fading channels, assuming the channels are with No Line Of Sight (NLOS), so the channels are Rayleigh fading channels. The results show that when the Doppler Shift Frequency increased the BER also increases and when Doppler Shift Frequency is 5Hz, the performance of the system is better for four types of QAM modulation and in the two cases of Flat and multi-path Frequency-Selective fading.

التنزيلات

بيانات التنزيل غير متوفرة بعد.

المراجع

F.Delestre and Y.Sun, “Pilot Aided Channel Estimation for MIMO-OFDM Systems”, University of Hertfordshire, London Communications Symposium 2009.

Subhankar Chakrabarti, “Study The Effect of Co-Channel Interference in STC MIMOOFDM System and Mitigation of CCI Using Beamforming Technique”, MSc thesis, National Institute of Technology, Rourkela, 2011-2013.

Prof. Shivendra Singh, Prof. Vikas Gupta, and Shiv kumar Yadav, “Performance Analysis of MIMO-OFDM (802.11n System) for WLAN Channel Model”, International Journal of Engineering Research and Applications (IJERA) Vol. 3, Issue 3, pp. 946-949, MayJun 2013.

Steven Charles Hemple, “Analysis and Simulation of Wireless OFDM Communications”, MSc thesis, San Diego State University, summer 2012.

Ruchin Mangla, and Maninder Singh, “Performance Comparison of MIMO-OFDM Transceiver Wireless Communication System Using QAM and QPSK Modulation Schemes”, Haryana, India, International Journal of Advances in Engineering Science and Technology, Vol.1, No.2, pp. 66-72, December 2012.

Dinesh Divakaran, “OWSS and MIMO-STC-OFDM: Signaling Systems for The Next Generation of High Speed Wireless LANs”, PhD.thesis, Department of Electrical Engineering College of Engineering University of South Florida, 2008.

Wang Yi Gu linfeng, “An Investigation of Peak-to-Average Power Reduction in MIMOOFDM Systems”, MSc thesis, Blekinge Institute of Technology, October 2009.

Abhishek Sharma, and Anil Garg, “BER Analysis Based on Transmit and Receive Diversity Techniques in MIMO-OFDM System”, International Journal of Electronics & Communication Technology, Haryana, India, Vol. 3, Issue 1, pp.58-60, January - March 2012.

Peter Sweeney, Error Control Coding from Theory to Practice, John Wiley and Sons Inc., 2002

Todd K. Moon, Error Correction Coding, John Wiley and Sons Inc., 2005.

MIT 6.02 Draft Lecture Notes, Convolutional Coding, October 4, 2010.

Bijoy Kumar Upadhyaya, and Salil Kumar Sanyal, Novel design of WiMAX multimode interleaver for efficient FPGA implementation using finite state machine based address generator, International Journal of Communications, Vol. 6, pp. 27-36, 2012.

Ioannis D.Erotokritou, " Space-Time Block Coding for Multiple Transmit Antennas over Time-Selective Fading Channels", Louisiana State University , May 2006.

Jing Xiao,"Analysis of OFDM MIMO", San Diego StatebUniversity, Summer 2010.

التنزيلات

منشور

2021-01-24

كيفية الاقتباس

Diana Hayder Hussein, & Thuraya Mahmood Qaradaghi. (2021). Effect of Doppler Shift frequency on the performance of 2x2 OSTBC-OFDM System. QALAAI ZANIST JOURNAL, 2(2), 230–238. https://doi.org/10.25212/lfu.qzj.2.2.24

إصدار

القسم

Articles