Two-dimensional cyclic code is one of the natural general-izations of cyclic code. In this paper we study the algebraic structure of some two-dimensional cyclic codes and their dual codes.

sidelobes

of the active subcarriers interfere with the adjacent spectral band

used by the primary system. In the proposed scheme, the code

generator matrix of the UW-OFDM is designed to suppress the

sidelobes. So, there is no need...