Accession Number : ADA314854

Title :   Robust Locally Optimum Detection.

Descriptive Note : Final rept.,

Corporate Author : ILLINOIS INST OF TECH CHICAGO DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Ucci, Donald R. ; Jacklin, William E. ; Mychal, Myron R.

PDF Url : ADA314854

Report Date : JUL 1996

Pagination or Media Count : 81

Abstract : The Locally Optimum (LO) detection technique has been studied for the improvement of communication system performance, especially for spread spectrum systems, wherein performance can still be degraded by high interference to signal ratios. A wide variety of signal interference types can be handled using advanced statistical decision and signal processing techniques, resulting in a robust receiver, suitable for incorporation into the SMART radio system. Two specific detectors are reviewed, namely the histogram indirect and the Fourier series approximation direct methods. Three associated LO detector enhancement techniques are derived and examined: the Least Squares (LS); the Characteristic Function (CF); and the preamble enhancement methods. Based on simulations developed using MATLAB, the enhanced LO detectors are shown to provide, in most cases, significantly better performance than previous methods. Moreover, the preamble technique is shown to be much more robust than the LS and CF enhancement methods, the cost being an increase in system overhead, something that is usually mostly already paid for by other system acquisition and protocol functions.

Descriptors :   *RADIO INTERFERENCE, *RADIO RECEPTION, SIGNAL PROCESSING, OPTIMIZATION, SIGNAL TO NOISE RATIO, DECISION THEORY, LEAST SQUARES METHOD, SPREAD SPECTRUM.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE