Masaki Shibahara, Shingo Suwa, Takahiko Saba and Iwao Sasase, "Multi-stage serial interference canceller with new interference rejection weight control using residual signal at the end of each stage for DS-CDMA systems,"2000 International Symposium on Information Theory and Its Applications (ISITA 2000), pp.899-902, Hawaii, USA, November 2000.