Stacked carrier discrete multiple tone communication system

摘要: A “stacked-carrier” spread spectrum communication system based on frequency domain spreading that multiplies a time-domain representation of baseband signal by set superimposed, or stacked, complex sinusoid carrier waves. In preferred embodiment, the energizes bins large fast Fourier transform (FFT). This provides considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. code-nulling method is included interference cancellation enhanced separation exploiting spectral diversity various sources. The basic may be extended to include multi-element antenna array nulling methods also using spatial separation. Such permit directive retrodirective transmission systems adapt can adapted radio environment. compatible with bandwidth-on-demand higher-order modulation formats use advanced (maximum-SINR) despreader adaptation algorithms.