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  • 1. Thenmozhi, K
    et al.
    Konakalla, Vamsi
    Vabbilisetty, SPP
    Amirtharajan, R
    Space time frequency coded (STF) OFDM for broadband wireless communication systems2011In: Journal of Theoretical and Applied Information Technology, ISSN 1992-8645, E-ISSN 1817-3195, Vol. 31, no 1, p. 53-59Article in journal (Refereed)
    Abstract [en]

    The current problems in wireless systems are multi-path propagation, frequency selective fading, Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI), with the major challenge being transmission of information having high data rates over long distances. The Orthogonal Frequency Division Multiplexing (OFDM) systems solve a few of the above stated problems by the use of diversity schemes, which increase the reliability and security of the message. By adopting Multiple-Input Multiple-Output (MIMO) and OFDM technologies, wireless systems could reach data rates up to several hundreds of Mbps and achieve spectral efficiencies of several tens of bits/Hz/s, which are unattainable for conventional Single-Input Single-Output (SISO) systems. This paper deals with the simulation of Space Time Frequency (STF) coded OFDM system. The coding schemes like Space Time (ST), Space Frequency (SF) and Space Time Frequency (STF) coding are compared and from the results it is proved that STF scheme performs better than ST and SF schemes. The Space Time Frequency coded communication system when is used along with diversity schemes like MIMO and Multiple Input Single Output (MISO) is compared for their performance over a fading channel having inherent noise, and it is further proved that MIMO performs better than MISO schemes.

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