Accession Number : ADA145207

Title :   Digital Correlator Speed Improvement by Multiplexing.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Leibowitz,L M

PDF Url : ADA145207

Report Date : 30 Sep 1983

Pagination or Media Count : 48

Abstract : Digital correlators can detect the presence of a reference binary code within a long sequence of bits. Correlation is an essential in proposed spread spectrum applications to future target identification interrogation/reply systems. High rate pseudorandom binary codes can be used to achieve transmission security and resistance to interference and jamming by spreading transmission bandwidth. Digital correlation provides reliability and cost benefits through the use of modern digital integration techniques but has been limited in speed. Several approaches to time division multiplexing of digital correlator devices, whereby k operations are overlapped in time, are developed in this report. Where synchronization with the input signal exists, the resulting multiplexed correlators provide k-times speed improvement over individual correlator devices. A completely synchronized correlator can be formed from k such multiplexed correlators by proper selection of outputs. A simplified realization is presented that only requires one set of k N/k-bit signal and reference registers and k sets of N-bit comparator circuits. Laboratory experimentation and computer simulations to support these concepts are described. (Author)

Descriptors :   *VELOCITY, *DIGITAL SYSTEMS, *TIME DIVISION MULTIPLEXING, *CORRELATORS, COMPUTER PROGRAM DOCUMENTATION, COMPUTERIZED SIMULATION, COST EFFECTIVENESS, TARGET RECOGNITION, INTEGRATED CIRCUITS, TRANSMITTANCE, CODING, JAMMING, SYNCHRONIZATION(ELECTRONICS), CORRELATION TECHNIQUES, INTERROGATION, BANDWIDTH, PSEUDO NOISE SYSTEMS, SPREAD SPECTRUM

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE