Space-Time Codes for Multiple Access Systems with Low MMSE Decoding Complexity
Journal
IEEE Transactions on Wireless Communications
Journal Volume
8
Journal Issue
10
Pages
4988-4992
Date Issued
2009-10
Author(s)
F.-T. Hsu
Abstract
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.
Type
journal article