Subspace-based blind detection for multipath CDMA: an efficient adaptive implementation

This work deals with the problem of signal reception in code division multiple access (CDMA) systems. We present an adaptive detector for multipath CDMA channels which mitigates the effects of multipath propagation (interchip and intersymbol interference) and multiple-access interference. It can be suitably implemented in mobile terminals of the CDMA systems due to its low complexity and single-user structure. The proposed detector can be viewed as an efficient adaptive implementation of the batch-processing subspace-based method proposed by Torlak and Xu (see IEEE Trans. on SP, vol.45, no.1, p.137-47, 1997). In this work, we also give the theoretical and experimental justification of the robustness of the method against channel order overestimation errors.