Fig. 1. Uplink system of the massive MIMO

Fig. 2. Shadow area of 4-QAM constellation diagram

Fig. 3. Traversal capacity and information rate of different MIMO systems

Fig. 4. Effect of offset on the number of cancellation layers. (a) Nt=8; (b) SNR is 15 dB

Fig. 5. Effect of weights on the number of cancellation layers. (a) Nt=8; (b) SNR is 15 dB

Fig. 6. Detection performance of different algorithms. (a) Nt=8; (b) effect of the number of transmit antennas on the performance of the algorithm

Fig. 7. Detection performance of D-OSIC algorithm and ML-OSIC algorithm

Fig. 8. Detection performance of ML-D-OSIC algorithm under different dth

Fig. 9. Effect of different parameters on the detection performance of ML-D-OSIC algorithm. (a) Effect of offset and SNR on the algorithm; (b) effect of offset and the number of transmit antennas on the algorithm; (c) effect of weight and SNR on the algorithm; (d) pair of weights and the number of transmit antennas

Fig. 10. Complexity of different signal detection algorithms. (a) Linear and nonlinear algorithms; (b) non-linear algorithms

Table 1. BER of different algorithms when Nt=8

Table 2. BER of ML-D-OSIC algorithm under different SNR

Table 3. BER of ML-D-OSIC algorithm under different dth

Table 4. BER of ML-D-OSIC algorithm when Nt=8

Table 5. BER of ML-D-OSIC algorithm when SNR is 15 dB