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Frequency and Timing Offset Analysis in OFDM using GNU Radio
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 126 - Number 15 |
| Year of Publication: 2015 |
| Authors: G. Yamuna, T. Padmavathi, Varghese Thattil |
10.5120/ijca2015906271
|
G. Yamuna, T. Padmavathi, Varghese Thattil . Frequency and Timing Offset Analysis in OFDM using GNU Radio. International Journal of Computer Applications. 126, 15 ( September 2015), 13-18. DOI=10.5120/ijca2015906271
Abstract
To enhance the performance and reduce the Inter Symbol Interference (ISI) at enhanced data rates in wireless communications, Orthogonal Frequency Division Multiplexing (OFDM) is being used. The performance of OFDM is degraded due to frequency and timing offsets which increase the Bit Error Rate (BER) in the wireless communication. Frequency offsets are caused due to difference between transmitter / receiver oscillators and Doppler shift. Timing offsets are due to symbol timing and sampling clock drift. This is estimated and compensated in the receiver. In this paper packet based data transmission test bed has been implemented for OFDM to analyze frequency and time deviation. The effect of frequency offset and timing offset in packet reception over different modulation techniques like BPSK, QPSK is evaluated. By incorporating the noise voltage, normalized frequency and sample timing offset the channel model is simulated in the noisy environment and effect of these parameters considered to maximize the throughput. The OFDM packet based data transmission with offset correction is simulated by using GNU Radio which is free & open-source software tool that provides signal processing blocks with a facility of modifying codes in these blocks.
References
- Nicola Marchetti, Muhammad Imadur Rahman, Sanjay Kumar and Ramjee Prasad “OFDM: Principles and Challenges”
- Understanding an OFDM transmission: http://www.dsplog.com/2008/02/03/understanding- an-ofdm transmission/
- Manushree Bhardwaj, Arun Gangwar, Devendra Soni “A Review on OFDM: Concept, Scope & its Applications” IOSR Journal of Mechanical and Civil Engineering (IOSRJMCE) ISSN: 2278-1684 Volume 1, Issue 1 (May-June 2012), PP 07-11 www.iosrjournals.org.
- Mourad MELLITI+, Salem HASNAOUI+, Ridha BOUALLEGUE++, “Analysis of Frequency Offsets and Phase Noise Effects on an OFDM 802.11 g Transceiver”, (+)SYSCOM Laboratory, National School of Engineering of Tunis TUNISIA (++)SYSTEL Laboratory SUP’COM, National School of Engineering of Sousse TUNISIA IJCSNS VOL.7 No.4, April 2007.
- Inter Carrier Interference (ICI) in OFDM due to Frequency offset http://www.dsplog.com/2009/08/08/effect-of-ici-in-ofdm/
- Ke-Yu, Chen (8818-0493), Zhi-Feng Chen (1218- 1197), “GNU Radio” Dept. of Electrical Computer Engineering University of Florida, Gainesville, Florida.
- WhatIsGR & what exactly does GNU Radio do from https://gnuradio.org/redmine/projectGnuradio/wiki/WhatIsGR
- “What is Software Defined Radio –Wireless Innovation Form”from www.wirelessinnovation.org/what_is_sdr.
- Carlos E. Caicedo, Ph.D. Student. Software Defined Radio and Software Radio Technology: Concepts and Application. Department of Information Science and Telecommunications University of Pittsburgh.
- T. M. Schmidl, and D. C. Cox, “Robust frequency and timing synchronization for OFDM,” IEEE Trans.Comm. 45, 1613-1621 (1997).
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