Performance improvement of CMA based FM multipath cancelling system in automobile application

Constant Modulus Algorithm (CMA) is widely applied to improve distorted transmitting radio signal at the receiver. FM radio is still very popular equipment for in-car entertainment. Therefore, correcting FM multipath distortion on conventional FM radio system is one of the greatly expected applications of CMA technique. In this paper, we discuss performance and improvement of the CMA based FM multipath cancelling system in automobile application by demonstrating influence of impulse noise, which is very common in vehicle environment. Impulse noise, which is received at antenna, will not be corrected at all before it goes into CMA based multipath canceling system as the input. the impulse noise on CMA input will make the system unstable so easily. Proposing limit error signal CMA, we can successfully achieve to avoid influence of the impulse noise.