Superposition-based adaptive modulated space time block coding for MIMO-OFDM systems

Authors:
Junwoo Jung;Byungchan Kwon;Hyungwon Park;Jaesung Lim
Affiliations:
Graduate School of Information and Communications, Ajou University, Suwon, Republic of Korea;Samsung Thales Co. Ltd., Daejeon, Republic of Korea;Graduate School of Information and Communications, Ajou University, Suwon, Republic of Korea;Graduate School of Information and Communications, Ajou University, Suwon, Republic of Korea
Venue:
IEEE Communications Letters
Year:
2010

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Abstract

We propose a superposition-based adaptive modulated STBC (SPAM-STBC) for MIMO-OFDM systems to improve adaptive modulation optimization of space time block coding (STBC). When transmit antennas have the different channel conditions, the previous adaptive modulated STBC selects the same modulation based on averaging of the multiple channel gains. If the different modulation is selected to each transmit antenna, the STBC decoding problem occurs. In this letter, we select the optimal modulation corresponding to each channel condition by the superpositioned space time encoding and decoding. Simulation shows the proposed SPAM-STBC scheme outperforms both the fixed and adaptive modulated STBC schemes by the maximum 0.407 bits/sec/Hz in terms of spectral efficiency.