A M-Ary Spreading Spectrum System Using FB-FDE

A novel scheme of M-ary spreading communication system using filter-banks for frequency domain equalization (FB-FDE) is proposed for overcoming multi-path fading with large delay and rapid variation of the channel, which is inherent in wideband ground-air communications under low antenna elevation conditions. Because the FB-FDE can remove the effect of dynamical long delay multi-path fading with very simple structure and the M-ary spreading communication system can support code-division multiple-access (CDMA) with high band efficiency, the proposed system is capable of suppressing the dynamic multi-path fading without reducing the channel efficiency. Theoretical analysis and simulation experiments show that the proposed system behaves better than single carrier with frequency domain equalization (SC-FDE) system in transmission performance, so that it should be promising in the applications of wideband ground-air communications with low elevation antenna.