A V-BLAST Detector Approach for W-CDMA Signals with Frequency Selective Fading

Abstract:
Due to the multipath propagation, the Wideband-Code Division Multiple Access (W-CDMA) channels are typically frequency-selective. For this reason, conventional Vertical - Bell Laboratories Layered Space-Time (V-BLAST) detection techniques are not suitable for W-CDMA-based MIMO systems (Multiple Input, Multiple Output). In this paper, we consider the use of MIMO schemes within W-CDMA systems and we propose a V-BLAST detector suitable for multipath, frequeny-selective channels where the individual detection of each path is performed using a simple decorrelator, and the resulting signals are combined through an MSE-based (Mean Square Error) multipath combining algorithm. Due to the high sensitiveness of this detector to interpath interference, a Multipath - Parallel Interference Cancellation (MPIC) is also considered, followed by either Successive Interference Cancellation (SIC) and Parallel Interference Cancellation (PIC).