Decision-feedback receiver for quasi-orthogonal space-time coded OFDM using correlative coding over fast fading channels

作者：Zhang Yu^*; Liu Huaping

来源：IEEE Transactions on Wireless Communications, 2006, 5(11): 3017-3022.

DOI：10.1109/TWC.2006.05054

• space-time codes
• orthogonal frequency division multiplexing (OFDM)
• time selective fading
• inter-carrier interference (ICI)
• inter-transmit-antenna interference (ITAI)

Orthogonal frequency division multiplexing (OFDM) is robust against frequency selective fading, but it is very vulnerable to time selective fading. In quasi-orthogonal space-time coded OFDM (ST-OFDM) systems, channel variations cause not only inter-carrier interference among different subcarriers in one OFDM block, but also inter-transmit-antenna interference (ITAI). When applied in fast fading channels, common ST-ODFM receivers usually suffer from an irreducible error floor. In this letter, we apply frequency-domain correlative coding combined with a modified decision-feedback detection scheme to effectively suppress the error floor of quasi-orthogonal ST-OFDM over fast fading channels. The effectiveness of the proposed scheme in mitigating the effects of channel time selectivity is demonstrated through comparison with existing schemes such as zero-forcing, two-stage zero-forcing, and sequential decision feedback estimation.

• 出版日期2006-11