Investigation of influence of communications link and synchronization error on noise tolerence of group transmission of binary information based on orthogonal Walsh function

The influence of the communications link and the synchronization error on the noise tolerance of a modem for group transmission of binary information based on orthogonal Walsh functions (by finding the probability of incorrect reception of a message binary code element) is investigated. The influence of the link and synchronization error are analyzed on the basis of the transient response of the communications link. An example is presented in which the number of interfering pulses over the processing interval is described by a Poisson distribution. It is found that group transmission is more noise tolerant than serial transmission when pulse interference is present. The lower the level of interference consisting of normal noise, the greater the gain in noise tolerance. The influence of the communications link and synchronization error becomes more significant as the number of binary code elements increases because of reduced influence of pulse.