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Space-Time Codes for Multiple Access Systems with Low MMSE Decoding Complexity
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DOI：10.1109/TWC.2009.081722.png)
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Abstract
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We study a class of space-time codes constructed by linear dispersion encoding that allow low-complexity linear minimum mean square error (MMSE) decoding for a multiple access system. Considering that the information symbols are drawn from square QAM constellations, we optimize rate-one space-time code designs with MMSE decoding to achieve minimum bit error rate (BER) for any channel realization. In addition, the performance is further improved with a simple MMSE successive interference cancellation (MMSE-SIC) method. Simulation results compare the proposed design with existing rate-one designs and show that simple rate-one circulant designs are also good candidates for deployment in multiple access systems.
Keywords:
Space-time codes
multiple access channels
minimum mean-square error (MMSE)
interference suppression
multiple-input multiple-output (MIMO) systems
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