DESIGN AND FPGA IMPLEMENTATION OF OFDM SYSTEM
Abstract
In this thesis, a baseband OFDM system with channel estimation and timing synchronization is designed andimplemented using the FPGA technology. The system is prototyped based on the IEEE 802.11a standard and the
signals is transmitted and received using a bandwidth of 20 MHz. With the help of the quadrature phase shift keying
(QPSK) modulation, the system can achieve a throughput of 24 Mbps. Moreover, the least squares (LS) algorithm is
implemented and the estimation of a frequency-selective fading channel is demonstrated. For the coarse estimation
of timing, a modified maximum-normalized correlation (MNC) scheme is investigated and implemented. Starting
from theoretical study, this thesis in detail describes the system design and verification on the basis of both
MATLAB simulation and hardware implementation. Bit error rate (BER) verses bit energy to noise spectral density
(Eb/N0) is presented in the case of different channels. In the meanwhile, comparison is made between the simulation
and implementation results, which verify system performance from the system level to the register transfer level
(RTL).
References
L. Hanzo, Y. Akhtman, L. Wang, and M. Jiang,
“MIMO-OFDM for LTE, Wi-Fi and WiMAX: Coherent
versus Non-coherent and Cooperative Turbo-transceivers,”
John Wiley & Sons Ltd, United Kingdom, 2011.
R. V. Nee and R. Prasad, “OFDM for Wireless
Multimedia Communications,” Artech House, Boston,
F. Xiong, “Digital Modulation Techniques,” 2nd
Edition, Artech House, Boston, 2006.
R. W. Chang, “Synthesis of band-limited orthogonal
signals for multichannel data transmission,” Bell System
Technical Journal, vol. 45, pp. 1775–1796, Dec 1966.
B. R. Saltzberg, “Performance of an efficient parallel
data transmission system,” IEEE Transactions on
Communications, vol. 15, pp. 805–811, December 1967.
R. W. Chang and R. A. Gibby, “A theoretical study of
performance of an orthogonal multiplexing data
transmission scheme,” IEEE Transactions on
Communications, vol. 16, pp. 529–540, August 1968.
R. W. Chang, “Orthogonal Frequency Division
Multiplexing,” U.S. Patent 3,488,445, filed November 14,
, issued January 6, 1970.
S. B. Weinstein and P. M. Ebert, “Data transmission by
frequency-division multiplexing using the discrete Fourier
transform,” IEEE Transactions on Communications, vol.
, pp. 628–634, October 1971.
B. Hirosaki, “An orthogonally multiplexed QAM
system using the discrete Fourier transform,” IEEE
Transactions on Communications, vol. 29, pp. 982–989,
July 1981.
B. Hirosaki, S. Hasegawa, and A. Sabato, “Advanced
groupband data modem using orthogonally multiplexed
QAM technique,” IEEE Transactions on Communications,
vol. 34, pp. 587–592, June 1986.
L. J. Cimini Jr, “Analysis and simulation of a digital
mobile channel using orthogonal frequency division
multiplexing,” IEEE Transactions on Communications, vol.
, pp. 665–675, July 1985.
M. Alard and R. Lassalle, “Principles of modulation
and channel coding for digital broadcasting for mobile
receivers,” EBU Technical Review, pp. 168–190, August
Downloads
Published
Issue
Section
License
Copyright Notice
Submission of an article implies that the work described has not been published previously (except in the form of an abstract or as part of a published lecture or academic thesis), that it is not under consideration for publication elsewhere, that its publication is approved by all authors and tacitly or explicitly by the responsible authorities where the work was carried out, and that, if accepted, will not be published elsewhere in the same form, in English or in any other language, without the written consent of the Publisher. The Editors reserve the right to edit or otherwise alter all contributions, but authors will receive proofs for approval before publication.
Copyrights for articles published in World Scholars journals are retained by the authors, with first publication rights granted to the journal. The journal/publisher is not responsible for subsequent uses of the work. It is the author's responsibility to bring an infringement action if so desired by the author.
