第 34 卷第 5 期 通 信 学 报 Vo l .3 4 No. 5 2the presence of complex SSα noise was proposed. The comprehensive Monte-Carlo simulation results show that the MELC-MUSIC algorithm not only outper- forms the fractional lower order statistics (FLOS) based MUSIC algorithms under low SNR conditions and multi-source signals environment, but also is robust with circular and noncircular signals. Key words: M-estimate; direction of arrival estimation; fractional lower order statistics; MUSIC algorithm