Narrow-band interference rejecting spread spectrum radio...

Details Narrow-band interference rejecting spread spectrum radio... Narrow-band interference rejecting spread spectrum radio...

2005-12-13

2005-12-13

Liu, Shuwang (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S355000, C375S145000, C375S284000, C375S285000

Reexamination Certificate

active

06975673

ABSTRACT:
A spread spectrum receiver and method having narrow-band interference rejection of narrow-band jamming signals using digital signal processing frequency domain techniques. The method performed in the receiver includes transforming the received signal to a frequency domain signal and identifying narrow-band interference components in the frequency domain signal; suppressing the identified narrow-band interference components by excising the identified narrow-band interference components from the frequency domain signal to produce an interference excised signal in the frequency domain, and storing in a memory frequencies corresponding to the identified narrow-band interference components; synchronizing a receiver code to a transmitter code in the frequency domain using the interference excised signal; generating coefficients for a time domain filter that includes notches at the frequencies corresponding to the excised narrow-band interference components and that jointly despreads and rejects narrow-band interference from the excised frequencies; applying the coefficients generated in the preceding step to the time domain filter, and despreading and filtering in real time in the time domain the received signal using the applied coefficients.

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