Abstract: A signal compression system a receiver comprising, a down frequency converter to which received compressed signals are fed thereby to provide compressed baseband signals and an m-bit digital correlator defined by the serial combination of n similar smaller correlator stages, each of k-bits, where nk=m, and a Fast Fourier Transform (FFT) processor having n input ports fed from the n similar smaller correlators stages, one to each port, thereby to provide n output signals from the FFT processor which are fed to signal selector means which serves to select that output signal from the FFT processor which has the largest amplitude thereby to provide a decompressed signal.