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Alamouti-based space-frequency coding for OFDM

WIRELESS PERSONAL COMMUNICATIONS 2005年第1-2期35卷 173-185页

作者： Hutter, AA Mekrazi, S Getu, BN Platbrood, F CSEM CH-2000 Neuchatel Switzerland Inst EURECOM F-06904 Sophia Antipolis France Univ Aalborg DK-9220 Aalborg Denmark

We investigate space-frequency block coding for OFDM systems with multiple transmit antennas, where coding is applied in the frequency domain (OFDM carriers) rather than in the time domain (OFDM symbols). In particular we consider Alamouti's code, which was shown to be the optimum block code for two transmit antennas and time domain coding. We show that the standard decoding algorithm results in significant performance degradation depending on the frequency-selective nature of the transmission channels, such that a low coherence bandwidth results in a huge degradation. The optimum decoding algorithm that alleviates this problem is the maximum-likelihood decoder for joint symbol detection. We present a performance analysis for the investigated space-frequency decoders in terms of the achievable BER results. Furthermore we compare space-time and space-frequency coding and discuss the respective advantages and drawbacks of the different decoding algorithms in terms of their complexity. It should be noted that for the space-time approach we introduce the so-called matched-filter receiver, which shows significantly lower complexity compared to the maximum-likelihood decoder known from literature. The HIPERMAN system serves as an example OFDM system for quantitative comparisons.

关键词： space-frequency coding joint maximum-likelihood detection/decoding transmit diversity OFDM

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Alamouti-based space-frequency coding for OFDM

Alamouti-based space-frequency coding for OFDM

引用

International Symposium on Wireless Personal Multimedia Communications

作者： Hutter, AA Mekrazi, S Getu, BN Platbrood, F CSEM CH-2000 Neuchatel Switzerland Inst EURECOM F-06904 Sophia Antipolis France Univ Aalborg DK-9220 Aalborg Denmark

关键词： space-frequency coding joint maximum-likelihood detection/decoding transmit diversity OFDM

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