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18.8 Simulation Evaluation 415
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CSNR (dB)
PSNR (dB)
HM−STBC, Hierarchical 4/16QAM
SP−MIMO, Hierarchical 4/8QAM
HM−STBC, Hierarchical 4/64QAM
SP−MIMO, Hierarchical 4/16QAM
New proposed
(a) Single-Antenna Users
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CSNR (dB)
PSNR (dB)
HM−STBC, Hierarchical 4/16QAM
SP−MIMO, Hierarchical 4/8QAM
HM−STBC, Hierarchical 4/64QAM
SP−MIMO, Hierarchical 4/16QAM
New proposed
(b) Two-Antenna Users
Figure 18.9 Our system versus two conventional reference systems, HM-STBC and SP-MIMO,
using the image Lena.
SP-MIMO, however, the additional antenna is underutilized in most cases, be-
cause the ...