  This paper presents a new, low-complexity algorithm for time and frequency
synchronization in a non-contiguous-orthogonal frequency division multiplexing
(NC-OFDM) radio communication system in the presence of narrowband interference
(NBI). This interference scenario is plausible for cognitive radio systems. The
computational complexity of the proposed synchronization method is similar to
the known Schmidl&Cox algorithm. The algorithm is partially blind, i.e., it
does not require information on the NC-OFDM subcarriers used, nor on the
center-frequency of the NBI. Moreover, it does not require filtering to remove
the NBI. It performs best for the NBI of constant carrier frequency, but it
also provides good results for the frequency-modulated interfering signal.
