Apparatus and method for detecting a signal in a communications

Details Apparatus and method for detecting a signal in a communications Apparatus and method for detecting a signal in a communications

1994-04-08

1996-09-03

Voeltz, Emanuel T.

Excavating

329304, 332103, 370 852, 375200, 375219, 375279, 375329, 34031001, 34031002, 34031003, 364514R, H04M 1104, H04J 302

Patent

active

055530818

ABSTRACT:
In a communications system, an apparatus and method for detecting a valid signal from noise. An adaptive threshold is used to qualify a received signal. The adaptive threshold is set according to the number of false detects occurring within a given time interval. The number of false detects is initially determined by a quick qualification process. This initial number is subsequently adjusted by a more accurate qualification process. The transmitted signal is modulated with a particular pattern. Upon receiving the signal, it is demodulated to retrieve that pattern. The demodulated pattern is correlated against multiple reference patterns and combined to provide a measure of peak correlation that is independent of pattern phase. Furthermore, a tone detector is used to distinguish valid signals from interfering tones. Two different types of detection methods are performed in parallel. One is based on the energy of the received signal, whereas the other is based on the correlation of the received signal.

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