DESIGN OF SPACE TIME TRELLIS CODED OFDM
Main Article Content
Abstract
Space Time Trellis Code (STTC) is a technique that can be used to improve the performance of
the Orthogonal Frequency Division Multiplexing (OFDM) system over wireless channels by
providing both coding gain and diversity gain. STTC is combined from two codes, Trellis Code
Modulation (TCM) as an inner code and Space Time Block Code (STBC) as an outer code. TCM
which combines the choice of a modulation scheme with that of a convolutional code provides the
coding gain, and the other code provides the diversity gain. Simulation is done over flat fading and
frequency selective Rayleigh fading channel for Eight Phase Shift Keying (8-PSK) TCM. It found
that the best results are obtained for the case of two transmitters and three receivers which have a
gain of about 18dB over that without STBC.
Article Details
Section
How to Cite
References
D. Agrawal, V. Tarokh, A. Naguib, and N. Seshadri, "Space-time coded OFDM for high data rate
wireless communication over wideband channels", in IEEE VTC-1998, vol. 3, pp. 2231-2236,
S. M. Alamouti, "A simple transmitter diversity scheme for wireless communications", IEEE Jour.
on Selected Areas in Co. http://www.xilinx.com/publications/products/v2/wireless.htm.,1999.
N. Balaban and J. Salz, "Dual diversity combining and equalization in digital cellular mobile radio",
IEEE Trans. Veh. Technol., vol. 40, pp. 342–354, May 1991.
R. Calderbank and J. E. Mazo, "A new description of trellis codes", IEEE Transaction on
Information Theory, vol. IT-30, pp. 784–791, November 1984.
Eric Lawrey, "The suitability of OFDM as a modulation technique for wireless telecommunications
with a CDMA comparison", Master Thesis, James Cook University, October 1997.
Mei Hong, "Analysis of the Bit Error Rate of Trellis-coded Modulation", Master Thesis,
CHALMERS UNIVERSITY OF TECHNOLOGY, Göteborg Sweden, 2002.
G. Ungerboeck, "Channel coding with multilevel/phase signals", IEEE Transaction on Information
Theory, vol. IT-28, pp. 55–67, January 1982.
M. Uysal, N. Al-Dhahir, and C. N. Georghiades, "A space-time block-coded OFDM scheme for
unknown frequency-selective fading channels", IEEE Commun. Lett., vol. 5, no. 10, pp. 393-395,
October 2001.
K. Witrisal, "OFDM Air-Interface Design for Multimedia Communications", Ph.D Thesis, Delft
University of Technology, The Netherlands, April 2002.
Yipeng Tang, "DSP Implementation of Trellis Coded Modulation and Distributed Space Time
Coding", Master Thesis, West Virginia University, Morgantown, West Virginia, 2001.