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Full-Rate (FR) and Full-Diversity (FD) are attractive features in MIMO systems. The authors refer to systems which achieve both FR and FD simultaneously as FRFD systems. Non-orthogonal STBCs can achieve FRFD without feedback, but their ML decoding complexities are high. V-BLAST without precoding achieves FR but not FD. FRFD can be achieved in VBLAST through precoding given full Channel State Information at the Transmitter (CSIT). However, with limited feedback precoding, V-BLAST achieves FD, but with some rate loss.
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