SYNCHRONIZATION OF SHIFT REGISTER GENERATORS IN GENERAL DISTRIBUTED SAMPLE SCRAMBLERS

In this paper, a theory is developed to support the synchronization of shift register generators (SRG's) in the general class of distributed sample scramblers (DSS's). In the general DSS, the samples transmitte d to the descrambler for its synchronization are freely generated out of tile scrambler SRG, a special case of which is to take samples dire ctly from the SRG sequence. To describe this general sampling method, the concept of sampling vectors Is introduced. The delayed sample-tran smission problem, which is a real problem in practical transmission sy stems, can be resolved by adopting the sampling vectors. This paper pr ovides a systematic solution to the synchronization problem of the gen eral DSS based on mathematical modeling. It first considers the sampli ng problem of the SRG state information, and then discusses the correc tion problem of the descrambler SRG state using the transmitted sample s. Applications are attached at the end to demonstrate the developed t heory for simple realizations of the DSS for use in the cell-based ATM transmission environment.