  Characterizing noisy quantum processes is important to quantum computation
and communication (QCC), since quantum systems are generally open. To date, all
methods of characterization of quantum dynamics (CQD), typically implemented by
quantum process tomography, are \textit{off-line}, i.e., QCC and CQD are not
concurrent, as they require distinct state preparations. Here we introduce a
method, "quantum error correction based characterization of dynamics", in which
the initial state is any element from the code space of a quantum error
correcting code that can protect the state from arbitrary errors acting on the
subsystem subjected to the unknown dynamics. The statistics of stabilizer
measurements, with possible unitary pre-processing operations, are used to
characterize the noise, while the observed syndrome can be used to correct the
noisy state. Our method requires at most $2(4^n-1)$ configurations to
characterize arbitrary noise acting on $n$ qubits.
