Articles | Volume 6
https://doi.org/10.5194/ars-6-107-2008
https://doi.org/10.5194/ars-6-107-2008
26 May 2008
 | 26 May 2008

A hybrid equalizer/Rake receiver for the Wideband CDMA Downlink in large delay spread channels

C. Buchacher, M. Zimmermann, S. Paul, and M. Huemer

Abstract. Signals transmitted over a multi-path propagation channel exhibit Inter-Path Interference (IPI) and fading. The receiver has to employ measures to mitigate these effects or it will incur severe performance degradation. A classic approach in Code Division Multiple Access (CDMA) communications is the Rake receiver. Alternatively, a Linear Minimum Mean Square Error (LMMSE) equalizer can further improve performance. This paper compares performance and computational complexity of these two algorithms. A hybrid solution will be introduced in order to decrease computational complexity while retaining most of the interference suppression capabilities of the LMMSE equalizer.