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Adaptive Switching between Space-Time and Space-Frequency Block Coded OFDM Systems in Rayleigh Fading Channel

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DOI: 10.4236/ijcns.2013.66034    4,656 Downloads   6,932 Views   Citations

ABSTRACT

This work explores the performances of Space-Time and Space Frequency Coded Orthogonal Frequency Division Multiplexing (OFDM) with simple two branches transmit diversity scheme. The combination of multiple-antenna and orthogonal frequency division multiplexing (OFDM) provides reliable communications over frequency selective fading channels. We focus on the application of space-time block codes (STBC) and space-frequency block codes (SFBC) in OFDM systems over time-varying and frequency-selective channels. SFBC transmitter shows superior performance in fast varying channels while STBC shows better performance in frequency selective channels. A switching technique is presented that selects an appropriate transmission scheme between the STBC and SFBC assuming Rayleigh fading model.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

M. Youssefi, N. Bounouader, Z. Guennoun and J. Abbadi, "Adaptive Switching between Space-Time and Space-Frequency Block Coded OFDM Systems in Rayleigh Fading Channel," International Journal of Communications, Network and System Sciences, Vol. 6 No. 6, 2013, pp. 316-323. doi: 10.4236/ijcns.2013.66034.

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