NDLI: Bit-interleaved space–frequency coded modulation for ofdm systems.

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Bit-interleaved space–frequency coded modulation for ofdm systems.

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Abstract	Abstract—We present an orthogonal frequency-division multiplexing (OFDM) system with bit-interleaved space–frequency coded modulation for frequency-selective fading channels employing multiple transmit and receive antennas. OFDM is used to transform a frequency-selective fading channel into multiple flat fading channels, and space–frequency trellis coding combined with bit-interleaving is used to exploit space and frequency diversity. The performance of such an approach is evaluated by analytical bounds and simulation. The proposed scheme is an efficient method to employ multiple transmit antennas to increase the data rate and, at the same time, improve the performance by means of increased diversity obtained with bit-interleaved coded modulation and multiple receive antennas. A block precoding method is proposed to further improve the diversity order. An efficient sphere decoding algorithm is also developed for reducing the decoding complexity of the proposed scheme. Index Terms—Bit-interleaved coded modulation (BICM), constellation precoding, frequency diversity, orthogonal frequencydivision multiplexing (OFDM), space–time coding, sphere decoding. I.
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Subject Keyword	Multiple Flat Fading Channel Bit-interleaved Coded Modulation Orthogonal Frequencydivision Multiplexing Bit-interleaved Space Frequency Coded Modulation Multiple Transmit Antenna Frequency Diversity Data Rate Ofdm System Receive Antenna Frequency-selective Fading Channel Index Term Bit-interleaved Proposed Scheme Bit-interleaved Space Frequency Space Time Coding Diversity Order Increased Diversity Orthogonal Frequency-division Multiplexing Analytical Bound Constellation Precoding Space Frequency Multiple Receive Antenna Efficient Method Multiple Transmit
Content Type	Text

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