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Table 1 SNR gains and gaps to the capacity for JCMD 4×4 MIMO systems

From: An efficient MIMO scheme with signal space diversity for future mobile communications

Parameters Gains compared with Gaps to the JCMD/Gaussian
  BICM system (dB) input Shannon limit (dB)
BPSK, 1/2-rate 2.2 1.0/1.5
QPSK, 1/2-rate 0.6 1.1/1.9
QPSK, 3/4-rate 3.9 0.7/2.3