| 摘要 |
PURPOSE: A circuit for removing jamming of a code division multiple access(CDMA) system is provided to divide a frequency band into sub frequency bands, and to remove a jamming component in a narrowband and pass remaining CDMA signal components instead of deleting an entire sub frequency band. CONSTITUTION: The first jamming detector(110) detects jamming mixed in filtered signals. Band pass filters(120-1/120-N) filter signals of a corresponding frequency band among signals inputted in a state that an entire frequency band of the filtered signals are divided to N sub frequency bands and allocated one by one. Jamming removers(130-1/130-N) connected to N band pass filters(120-1/120-N) removes jamming components among signals passed a corresponding band pass filter, and passes remaining CDMA signal components. A signal mixer(140) mixes signals outputted from the jamming removers(130-1/130-N) for outputting. The first switching circuit(SW1) outputs the filtered signals to the first terminal if jamming is not detected by the first jamming detector(110), and delivers the filtered signals to the N band pass filters(120-1/120-N) through the second terminal if jamming is detected. The second switching circuit(SW2) selects signals outputted in the first terminal to deliver the selected signals to a demodulater if jamming is not detected by the first jamming detector(110), and selects output signals of the signal mixer(140) to deliver the selected signals to the demodulater if jamming is detected.
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