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

My Abdelkader Youssefi, Nawal Bounouader, Zouhair Guennoun, Jamal El Abbadi

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Laboratoire d’Electronique et de Communications (LEC), Ecole Mohammedia d’ingénieurs (EMI), Université Mohammed V Agdal (UM5A), Rabat, Morocco.

DOI: 10.4236/ijcns.2013.66034                

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.

Keywords

OFDM; MIMO; Rayleigh Fading Channel; STBC; SFBC

Conflicts of Interest

The authors declare no conflicts of interest.

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