
Accession Number : AD0726101
Title : Subsequence Sync Design.
Descriptive Note : Final technical rept. MarNov 70,
Corporate Author : RAYTHEON CO SUDBURY MASS EQUIPMENT DIV
Personal Author(s) : Turyn,Richard J. ; Herman,Jan
Report Date : JUN 1971
Pagination or Media Count : 49
Abstract : The report is concerned with the determination of the phase of a binary sequence whose rule of formation is known but which has been received with errors. It is desired to determine the phase from a relatively short sequence. The authors describe what they call a predictive correlator, which represents a new approach to the correlation problem. It allows decisions on the phase of the incoming sequence in a much shorter tme and with much simpler equipment than a conventional correlator, with better probability of success. Although the emphasis is on the msequences the idea is applicable to any binary sequence. The authors present the design of a predictive correlator, which would operate at a 10 nanosecond rate, and of all equipment which would be necessary for a laboratory demonstration of the feasibility of the scheme. In addition, the report discusses some results on the statistics of the weights of subsequences of an msequence. It is shown that the predictive correlator will provide synchronization on subsequences of length 500 for an msequence of length ((2 to the 23rd power)1) with probability of missed synchronization and false synchronization more than two orders of magnitude less than the probability of error of the input pulses. (Author)
Descriptors : (*INFORMATION THEORY, PHASE MEASUREMENT), (*PULSE COMMUNICATIONS, *SYNCHRONIZATION(ELECTRONICS)), FEASIBILITY STUDIES, SHIFT REGISTERS, CORRELATION TECHNIQUES, PROBABILITY, SEQUENCES(MATHEMATICS), CODING
Subject Categories : Cybernetics
Nonradio Communications
Distribution Statement : APPROVED FOR PUBLIC RELEASE