When [absolute value of [DELTA][theta]] decreases, the main lobe of the QSWL GSC points almost to the source location, but the main lobe of the CLCMV is away from the source location.
From Figures 5 and 6, it is seen that the QSWLLCMV beamformer outperforms obviously both the QSWLQPMC-MVDR and the CLCMV. In the case of no DOA mismatch and M = 6, the output SINR of the QSWL-LCMV is 25 dB more than that of the ClCMV, but the output SINR of the CLCMV is larger than that of the QSWL-QpMc-MVDR.
From Figure 7, it is seen that the QSWL GSC has slower convergence than the CLCMV. But the output SINR of the QSWL-LCMV are obviously more than that of the CLCMV.