2013•International Journal of Communications Network and System SciencesOpen access

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

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.

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Key concepts: Orthogonal frequency-division multiplexing, Fading, Block code, Space–time block code, Rayleigh fading, Computer science, Transmit diversity, Electronic engineering