Abstract : The Discrete MultiTone (DMT) modulation system is an attractive method for a high speed data transmission over a non-flat channel with possible colored noise. The IFFT is used in its transmitter in order to divide the available frequency spectrum into large independent narrow band sub-channels. A high speed and an efficient lattice architecture is proposed to implement the IFFT. This will speed up the DMT transmitter, so that, it can be easily used in any real time data transmission application. The proposed IFFT lattice architecture achieves approximately 58%, 39%, and 50% savings in gate count, power consumption, and area compared to the state of the art IFFT architectures that use conventional lattice structure. The proposed IFFT lattice architecture can perform high speed data transmission at 118 MHz. This allows the DMT transmitter to be easily integrated in any real time data transmission system. Keywords: DMT; lattice structure; CORDIC; high speed data transmission.