  This paper proposes a new multi-carrier system, called orthogonal code-based
block transmission (OCBT). OCBT applies a time-spreading method with an
orthogonal code to have a block signal structure and a windowing procedure to
reduce the out-of-band (OOB) radiation. The proposed OCBT can transmit the
quadrature amplitude modulation (QAM) signals to use the conventional multiple
input multiple output techniques. Numerical results show that the proposed OCBT
using QAM signal has the short burst compared to the filter-bank multi-carrier
(FBMC), the low complexity compared to FBMC and windowed orthogonal frequency
division multiplexing (W-OFDM) and also the low OOB radiation compared to OFDM.
