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Proper tracking of signals at any intermediate stage of a processing system or at the receiver of modern day communication systems has been given much importance over the last two decades. Proper tracking of the signal envelope is evidently very necessary; for communication systems, to recover the message signal that was transmitted with minimum error whereas for signal processing applications, to regenerate the signal in its most precise form by removing unwanted noise, harmonics, undesired frequency components etc. To develop a system which would be able to track a wide range of signals accurately, a generalized parameter should be available to us which would define all signals accurately. The 'instantaneous phase' information of the signal is kept intact and thus it is a very vital parameter to represent any signal. Thus, if the instantaneous phase of the signal is properly tracked, the signal can be easily regenerated. In recent times, DPLL algorithms have emerged as an efficient technique for phase recovery and considering this aspect, a Zero Crossing Algorithm based DPLL system for phase recovery is proposed.

For a specialized device or setup in case of any practical communication related problem definition, a sound communication system consisting of the necessary integral parts is very crucial. As such, the design and an analysis of the various communication system is very critical as it directly effects the performance of the device and also reveals the inherent capacity of the system to produce the desired results. In this respect our topic for this paper is the design and analysis of different digital communication systems with a view to determine the most effective system considering all the parameters so that it can be used for important communication based problems and situations. In the next section we will mainly focus on the design processes of various systems, the theory involved, the simulation results, some special techniques of error correction and also the error performance of the systems.