Contents I. Introduction
In cellular mobile communication systems, the capacity is, in most cases, limited by the cochannel interference (CCI). In particular, for the downlink, where the receiver is usually equipped with only one antenna, due to the cost and size limitation, cancellation of the CCI is quite difficult. Moreover, the multipath dispersion in the mobile channel causes intersymbol interference (ISI), which adds to the complexity of the receiver. For time-division multiple-access systems, such as the Global System for Mobile Communications (GSM) system, a complex equalizer has to be utilized to combat severe ISI. In this situation, various single-antenna interference cancellation (SAIC) [1] algorithms have been proposed to combat both the CCI and ISI. It is reported in [2] that SAIC techniques can provide significant gain in carrier-to-interference ratio (CIR) and improve the system capacity by 39%–57% for the GSM networks.
