We propose a compressive method for tracking doubly selective

channels within multicarrier systems, including OFDMsystems. Using

the recently introduced concept of modified compressed sensing

(MOD-CS), the sequential delay-Doppler sparsity of the channel is

exploited to improve estimation performance through a recursive estimation

mode. The proposed compressive channel tracking algorithm

uses a MOD-CS version of OMP with reduced complexity.

Simulation results demonstrate substantial performance gains over

conventional compressive channel estimation