Interference-tolerant spread-spectrum receiver and method theref

Details Interference-tolerant spread-spectrum receiver and method theref Interference-tolerant spread-spectrum receiver and method theref

1997-05-08

1999-09-14

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375206, 375207, 375316, H04B 1500

Patent

active

059533650

ABSTRACT:
An interference-tolerant spread-spectrum receiver (20) includes an FIR (finite impulse response) filter network (32) and a correlator/detector (34). The filter network (32) contains a pair of FIR filters (36) substantially identical to each other. A signal passes directly into the first filter (36'), but is delayed a predetermined amount of time before passing into the second filter (36"). Each of the filters (36) contains means for sampling (62) and windowing (70) the signal in the time domain; transforming (118) the signal to the frequency domain; limiting (130) and despreading (160) the signal in the frequency domain; and transforming (168) the signal back to the time domain. The signal from the first filter (36') is delayed the predetermined amount of time to resynchronize signals from both filters (36), which signals are then combined into a single signal. The combined signal is then passed into the correlator/detector (34), which determines the presence or absence of a spread-spectrum signal.

REFERENCES:
patent: 5271038 (1993-12-01), Cai
patent: 5377225 (1994-12-01), Davis
patent: 5596600 (1997-01-01), Dimos et al.
patent: 5629929 (1997-05-01), Blanchard et al.
patent: 5640416 (1997-06-01), Chalmers
patent: 5673286 (1997-09-01), Lomp
patent: 5825810 (1998-10-01), Omura et al.
patent: 5844936 (1998-12-01), Lesthievent
Some Alternatives in Transform-Domain Suppression of Narrow-Band Interference for Signal Detection and Demodulation, by Stuart D. Sandberg, Stephen Del Marco, K. Jagler and M.A. Tzannes, Dec. 12, 1995.

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