Blind estimation of band limited channels: a low complexity approach

We consider the problem of blind estimation of a band-limited channel excited by a cyclostationary input. We propose a channel estimation method that, like several existing ones, exploits the relationship between the channel frequency response and the cyclic spectrum. However, the novelty here is an approximation made for the discretized phase of the cyclic spectrum, which, under certain conditions, results in a significant simplification of the aforementioned relationship. The result is a channel estimation method with complexity equal to that of an IDFT. The proposed approach is applied to simulated data, and real recordings obtained at our wireless communications testbed, and is compared to existing methods.