TITLE:
Adaptive Switching between Space-Time and Space-Frequency Block Coded OFDM Systems in Rayleigh Fading Channel
AUTHORS:
My Abdelkader Youssefi, Nawal Bounouader, Zouhair Guennoun, Jamal El Abbadi
KEYWORDS:
OFDM; MIMO; Rayleigh Fading Channel; STBC; SFBC
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.6 No.6,
June
18,
2013
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.