Digital Correlator Speed Improvement by Multiplexing.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1983
- Accession Number
- ADA145207
Entities
People
- L. M. Leibowitz
Organizations
- United States Naval Research Laboratory