The demodulation process takes the received signal and recovers the information that was sent. Demodulation provides the tracking loops and detection processes and requires careful design to ensure maximum likelihood of retrieving the data with the minimum bit error rate (BER). There are two ways to analyze the demodulation process of digital modulated signals for phase shift keying (PSK) signals depending on the type of modulation waveform used and the corresponding demodulation process used. One option is to use an asynchronous process that combines the phase shift times (bits or chips) using a matched filter. This matched filter generally consists of a tapped delay line with the tap spacing equal to the bit or chip duration and provides a means to sum all of the phase shifts. This can be done either using analog tapped delay lines or digital filters. Most systems use digital means for implementing this type of demodulation scheme. Another possibility is to analyze the demodulation of a PSK signal to coherently demodulate the incoming signal using several methods of implementation of various tracking loops. Since PSK systems suppress the carrier, a carrier recovery loop is used to re-establish the carrier to downconvert the signal to baseband. Also, if spread spectrum is used, the spread spectrum code must be stripped off in order to obtain the data stream, which is usually done with a sliding correlator. Once the data stream is produced, the bits have to be sampled to recover the digital data that was...