Question

What do you mean by synchronization in pam system?

Answer 1

in a pam system with unknown carrier phase and timing phase the receiver has to estimate these parameters.The dataaided approach involves the joint estimate of the data symbols and the unknown parameters . This is in contrast with the nondataaided approach where the carrier phase are estimated independently of the data symbols. We first establish the equivalence of these 2 strategies for high signals to noise ratios.Then we demonstrate that several pam system (baseband, VSB, QAM) perform better when the data symbols are independent equiprobable bits instead of independent identically distributed Gaussian variable. Finally some generalisations of the previous conclusions are treated.