By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.