Robust Locally Optimum Detection.
ILLINOIS INST OF TECH CHICAGO DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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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.
- Radiofrequency Wave Propagation