For the sake of completeness, in this section we make a few brief remarks.
Remark 1: A coded architecture namely Turbo-BLAST has been proposed in [31 ]. The
new transceiver has less computational complexity than the optimal ML decoder. Furthermore,
it has a probability of error performance that is order of magnitude smaller than the
traditional BLAST architecture [31].
Remark 2: DBLAST is the most complex algorithm of the BLAST architecture. Then
probably comes the Turbo-BLAST, and the the simplest one is VBLAST.
Remark 3: BLAST architecture achieves its best performance in rich-scattering channels
[4]. Thus, spatial correlation limits the performance of BLAST transceivers.
Remark 4: ZF, MMSE, SIC, and OSIC receivers provide only N—M+l diversity order,
but have varying SNR loss (see Table. 2.1). Thus, with N = M, the diversity performance
for linear receivers is exactly the same as that of SISO system! Therefore, the use of
suboptimal receivers incur a loss in the diversity order. This is in contrast to the more
complex ML receiver for which the diversity order is always N [13]. However, SIC/OSIC
receivers have the lowest SNR loss among all suboptimal receivers.
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