26. Spread-Spectrum Based on Finite Field Fourier Transforms


Spread-spectrum systems are presented, which are based on finite field Fourier transforms.
Orthogonal spreading sequences defined over a finite field are derived. New digital multiplex schemes
based on such spread-spectrum systems are also introduced, which are Multilevel Coding Division Multiplex.
These schemes termed Galois-field Division multiplex GDM offer compact bandwidth requirements because
only leaders of cyclotomic cosets are needed to be transmitted.