Low Complexity Submatrix Divided MMSE Sparse-SQRD Detection for MIMO-OFDM with ESPAR Antenna Receiver

Table 4

Total flops per subcarrier of the receiver using QPSK mod.

MIMO-OFDM system	FFT	Channel estimator	Detection	Total
ZF-VBLAST with ESPAR [3, 4]	70	1856	4.1 ×10^7	4.1 ×10^7
Full-size w/o division	70	1856	7005	8931
Proposed (𝑘=18) 4-sym. over.	70	1856	770	2696
2 × 2 VBLAST w/o ESPAR	70	173	542	785