On the Performance of a Constellation-rotated Time-spreaded Space-frequency Coding Scheme for 4 × 1 MISO OFDM Transceivers

Authors:
S. Senthuran;A. Anpalagan;O. Das;S. Khan
Affiliations:
Department of ELCE, Ryerson University, Toronto, Canada;Department of ELCE, Ryerson University, Toronto, Canada;Department of ELCE, Ryerson University, Toronto, Canada;ECE Discipline, Khulna University, Khulna, Bangladesh
Venue:
Wireless Personal Communications: An International Journal
Year:
2011

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Abstract

In this article, we propose a time-spreaded quasi-orthogonal space-frequency coded OFDM system with constellation rotation. A constellation rotated quasi-orthogonal OFDM system could offer full rate and full diversity in a frequency selective fading channel. Time spreading can give additional time diversity gain in a fast fading channel. Assuming that complex channel gains between adjacent subcarriers are approximately equal, we develop a coding scheme for 4 脳 1 MISO transceiver and its BER performance is evaluated for different Doppler frequencies in an OFDM system. The simulation results show that 2 dB gain can be achieved at BER of 10驴3 using the proposed scheme compared to a scheme without time spreading and constellation rotation when 512 subcarriers are used at maximum Doppler frequency of 300 Hz. Also, the proposed system is analyzed for different delay spread of the channel and the results show that if adjacent subcarriers are correlated, it is better in SF-OFDM decoding.