Adaptive threshold in a spread spectrum communications system
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Abstract
A transceiver for transmitting and receiving spread spectrum signals having an adaptive threshold for distinguishing between valid receive data signals and noise. The transceiver includes a transmitter for transmitting spread spectrum signals and a receiver for receiving spread spectrum signals. A correlator correlates a received signal against an expected receive pattern. The correlation of the received signal is compared to a threshold value. If the correlation exceeds the threshold value, a carrier detect signal is generated. The number of false carrier detect signals occurring within a pre-determined period of time is determined. The threshold value is varied according to the number of false carrier detects.
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Current AssigneeEchelon Corporation (Renesas Electronics Corporation)
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Original AssigneeEchelon Corporation (Renesas Electronics Corporation)
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InventorsSutterlin, Philip H., Hurlbut, Amy O.
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Primary Examiner(s)CANGIALOSI, SALVATORE A
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Application NumberUS07/942,646Time in Patent Office433 DaysField of Search375/1, 380/34, 455/226.2US Class Current375/142CPC Class CodesH04B 1/70712 with demodulation by means ...H04B 1/709 Correlator structure
