A simplified hard output sphere decoder for large MIMO systems with the use of efficient search center and reduced domain neighborhood study

EURASIP Journal on Wireless Communications and Networking

Table 4 SNR loss at BER = 10⁻⁴, ODN ZF-SIC FNSA, ODN MMSE-SIC FNSA, RDN LRA-ZF-SIC FNSA, RDN LRA-MMSE-SIC FNSA, and RDN LRA-MMSE-OSIC FNSA compared to ML

	SNR loss (QPSK)				SNR loss (16-QAM)
Technique	K = 1	K = 2	K = 3	K = 4	K = 1	K = 2	K = 4	K = 16
ODN exact ZF-SIC FNSA	>7.6	>7.6	>7.6	0.36	>5.0	>5.0	>5.0	0
ODN equivalent MMSE-SIC FNSA	>7.6	>7.6	6.21	0.30	>5.0	>5.0	>5.0	0.09
RDN exact LRA-ZF-SIC FNSA	4.43	2.90	1.92	1.71	3.21	2.04	1.27	0.62
RDN equivalent LRA-MMSE-SIC FNSA	2.90	0.73	0.52	0.27	2.12	0.76	0.53	0.40
RDN equivalent LRA-MMSE-OSIC FNSA	0.80	0.01	0	0	1.62	0.02	0	0