In this paper, we present an improved channel estimation algorithm for orthogonal frequency-division multiplexing mobile communication systems using pilot subcarriers. This algorithm is based on a parametric channel model where the channel frequency response is estimated using anL-path channel model. In the algorithm, we employ the ESPRIT (estimation of signal parameters by rational invariance techniques) method to do the initial multipath time delays acquisition and propose an interpath interference cancellation delay locked loop to track the channel multipath time delays. With the multipath time delays information, a minimum mean square error estimator is derived to estimate the channel frequency response. It is demonstrated that the use of the parametric channel model can effectively reduce the signal sub-space dimension of the channel correlation matrix for the sparse multipath fading channels and, consequently, improve the channel estimation performance.
- Channel estimation
- Fading radio channels
- Wireless communication systems
ASJC Scopus subject areas
- Electrical and Electronic Engineering