System and method for detecting narrow bandwidth signal...

Details System and method for detecting narrow bandwidth signal... System and method for detecting narrow bandwidth signal...

2005-12-23

2009-08-18

Le, Lana N (Department: 2614)

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

C455S067110, C455S182100, C455S266000

Reexamination Certificate

active

07577412

ABSTRACT:
A system and method for detecting the presence of a signal on a channel mixes signals received with an antenna with a local signal having a controllable frequency within a band of frequencies defined by the channel. The local signal is produced with a sequentially adjusted frequency within the channel. The mixing operation (for each local signal frequency) produces an output signal having a frequency indicative of a difference between a frequency of signals received with the antenna and a frequency of the local signal. The output signal is converted to a baseband frequency band, and is then analyzed to determine whether the signals received with the antenna occupy the channel.

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