FM signal multipath reduction using multiplier-less digital adaptive filters

Multipath interference can be removed from constant envelope signals using adaptive channel equalization based on the constant modulus algorithm (CMA). To be useful in a vehicular mobile radio system, adaptation must occur rapidly by using uncomplicated and cost-effective hardware. This paper will present a new multiplier-less filter structure based on logarithmic algebra with anticipated savings in computational complexity. This paper will discuss the filter application for analogue FM multipath reduction. The simulated distortion is observed to be consistent with that of published measurements. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 1–3, 2003