Serial Concatenated Super-Orthogonal Space-Time-Frequency Trellis Coded OFDM

Conference: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
04/03/2006 - 04/07/2006 at Munich, Germany

Proceedings: TURBO - CODING - 2006

Pages: 6Language: englishTyp: PDF

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Aksoy, Kenan; Aygölü, Ümit (Istanbul Technical University, Faculty of Electrical and Electronics Engineering, 34469 Maslak, Istanbul, Turkey)

In this paper, we present a new space-time-frequency coded orthogonal frequency-division multiplexing (OFDM) scheme that achieves high diversity gain through frequency-selective multipath fading channels with L taps. The proposed serial concatenated scheme combines an inner super-orthogonal space-time-frequency trellis code (SOSTFTC) with an outer punctured convolutional code (PCC) that provides additional coding and diversity gain, so that the overall diversity of the system becomes Gd = Nr ×min{Lgdfree,NtL} where Nt and Nr are the number of transmit and receive antennas, respectively, Lg is the build-in space-frequency diversity of the SOSTFTC, and dfree is the outer code’s minimum Hamming distance. The bit error rate (BER) for an example concatenated code employing inner 16-state QPSK SOSTFTC was evaluated by computer simulations and it is shown that significant error performance improvement is obtained.