Patent ID: 8879606

Claim:
A communications method comprising: providing a frequency content by Fourier transforming a signal; then forming at baseband a desired spectrum shape that differs from the frequency content, responsive to the frequency content; then generating at baseband a waveform by inverse Fourier transforming the desired spectrum shape; and then transmitting the waveform by using a plurality of elements thereof, sequentially one after another, to modulate a single carrier frequency; wherein generating at baseband a waveform by inverse Fourier transforming the desired spectrum shape comprises: generating at baseband a discrete time-domain waveform U(nT) without resorting to chipping of the inverse Fourier transform of the desired spectrum shape with a binary waveform; wherein n denotes a discrete time index of U(nT), wherein n=1, 2, . . . , N; and NT≦τ; wherein τ denotes a time span of the discrete time-domain waveform U(nT); and wherein T>0; and wherein transmitting the waveform by using a plurality of elements thereof, sequentially one after another, to modulate a single carrier frequency comprises: using substantially all of the elements of U(nT) sequentially to modulate the single carrier frequency by using U(T), followed by using U(2T), . . . , followed by using U(NT).