Patent ID: 7769093

Claim:
Communication apparatus, comprising: (1) a transmitter comprising: a plurality of invertible differentiating transforms for processing a constant modulus frequency domain signal to generate a plurality of different sub-channel signals; a plurality of amplitude tagging processes for uniquely identifying each of the sub-channel signals by way of a unique amplitude tag embedded in the respective sub-channel signal; a plurality of inverse discrete Fourier transforms for respectively inverse Fourier transforming the sub-channel signals into the time domain; a plurality of upsampling processes for upsampling the inverse Fourier transformed sub-channel signals; a process for calculating the crest factor for each of the upsampled sub-channel signals and for selecting the sub-channel signal having the minimum crest factor; a digital-to-analog (D/A) converter for converting the selected sub-channel signal having the minimum crest factor to an analog signal for transmission; and a power amplifier for amplifying the analog signal for transmission over a communication channel; and (2) a receiver comprising: an analog-to-digital converter for digitizing a received analog signal; a discrete Fourier transform for transforming the digitized received signal into the frequency domain; an amplitude tag detector for detecting the unique amplitude tag embedded in the received signal; an inverse process for processing the received signal using an inverse transform of the identified differentiating transform; and a symbol detector for detecting the constant modulus frequency domain signal transmitted by the transmitter.