# Multipath channel estimation in single carrier modulation

I think it’s a basic question, but I couldn’t get it’s clear answer. If we have data symbols $$x$$ vector of length $$N$$ x $$1$$ ; it’s convoluted with a multipath channel $$h$$ of length $$L$$ x $$1$$; the resulted signal

$$y$$ = $$h * x$$ ;

where $$*$$ is convolution operation.
if we have $$x_{(1:4:N)}$$ is the pilot symbols which well-known at the receiver, how can we get $$h$$ based on $$y$$?

thank you.