likelihoodDetectionModule.thresholdDetector

Class Threshold

java.lang.Object

likelihoodDetectionModule.thresholdDetector.Threshold

public class Threshold
extends java.lang.Object

This class performs the actual max likelihood detector logic. There is one per SignalBand. Basically, it checks that the SNR is above the inBandThreshold (this comparison is done in linear units, even though thresholds are specified in dB). Next, a secondary test is performed. The signal estimate in each associated GuardBand (if any were specified) is taken, and averaged. If this average level is greater than the guardBandThreshold, a detection is initiated. The detection remains active for as long as these two tests pass. When a detection begins, the startDetection() method of DetectionFilter is called, and an updateDetection() is immediately called with the data of the first data point. Any subsequent data points are passed to the DetectionFilter by calling its updateDetection() method. Finally when the detetction finished, the DetectionFilter's endDetction() method is called.

Author:

Dave Flogeras

Constructor Summary

Constructors

Constructor and Description
Threshold(DetectionFilter detectionFilter, int signalBandIndex, SignalBand signalBand, java.util.Map<java.lang.Integer,GuardBand> guardBands) Constructor.

Method Summary

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Threshold

public Threshold(DetectionFilter detectionFilter,
         int signalBandIndex,
         SignalBand signalBand,
         java.util.Map<java.lang.Integer,GuardBand> guardBands)

Constructor.

Parameters:

detectionFilter - The post detection filter to use.

signalBandIndex - The index (within the data blocks) of the signal band of interest for this threshold

signalBand - The SignalBand object defining this thresholds band of interest

guardBands - The mapping of indices (into the data blocks) and respective guardBands associated with the signalBand. This may be an empty list or null if there are no associated guardBands.