  Since most components of sparse multi-path channel (SMPC) are zero, impulse
response of SMPC can be recovered from a short training sequence. Though the
ordinary orthogonal matching pursuit (OMP) algorithm provides a very fast
implementation of SMPC estimation, it suffers from inter-atom interference
(IAI), especially in the case of SMPC with a large delay spread and short
training sequence. In this paper, an adaptive IAI mitigation method is proposed
to improve the performance of SMPC estimation based on a general OMP algorithm.
Unlike the ordinary OMP algorithm, a sensing dictionary is designed adaptively
and posterior information is utilized efficiently to prevent false atoms from
being selected due to serious IAI. Numeral experiments illustrate that the
proposed general OMP algorithm based on adaptive IAI mitigation outperform both
the ordinary OMP algorithm and the general OMP algorithm based on non-adaptive
IAI mitigation.
