Design and VLSI Implementation for a WCDMA
Eugene Grayver, Jean‐François Frigon, Ahmed M. Eltawil, A. Tarighat, K. Shoarinejad, Aliazam Abbasfar, Babak Daneshrad · 2005
The third generation (3G) of cellular communications standards is based on wideband CDMA. The wideband signal ex- periences frequency selective fading due to multipath propagation. To mitigate this effect, a RAKE receiver is typically used to coher- ently combine the signal energy received on different multipaths. An effective multipath searcher is, therefore, required to identify the delayed versions of the transmitted signal with low probability of false alarm and misdetection. This paper presents an efficient and novel WCDMA multipath searcher design and VLSI archi- tecture that provides a good compromise between complexity, per- formance, and power consumption. Novel multipath searcher al- gorithms such as time domain interleaving and peak detection are also presented. The proposed searcher was implemented in 0.18 m CMOS technology and requires only 150 k gates for a total area of 1.5 mm consuming 6.6 mw at 100 MHz. The functionality and performance of the searcher was verified under realistic con- ditions using a channel emulator.