PERFORMANCE OF COHERENT DETECTION SYSTEMS USING DECISION DIRECTED CHANNEL MEASUREMENT
Abstract
A receiver which employs coherent, or synchronous, detection must have a priori knowledge of the phase of the recieved signal. The receiver acquires this knowledge by performing measurements on the channel. The result of the measure ment process is a noisy phase reference which is used by the receiver in the detection processing of the incoming signals. In this report, the effect of using baud decisions to direct the phase measurement process is investigated by means of computer simulation of a coherent com munication system employing either orthogonal or phase-reversal signaling. Error rates are given for several signal-to-noise ratios. A major conclusion of this study is that phase measurements obtained through such a decision directed technique result in system error rates which are generally less than error rates of corresponding nondecision directed phase measurement schemes at all signal-to-noise ratios; no threshold exists below which a decision directed phase measurement system deteriorates rapidly.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 27, 1963
- Accession Number
- AD0409819
Entities
People
- J. G. Proakis
- P. R. Drouilhet Jr.
Organizations
- Massachusetts Institute of Technology