Complex signal limiting

Details Complex signal limiting Complex signal limiting

1995-10-19

1998-04-14

Chin, Stephen

Pulse or digital communications

Receivers

Interference or noise reduction

375334, 455308, 329321, H04B 110, H03K 508, H03D 300

Patent

active

057402078

ABSTRACT:
Each complex signal sample a(k)+jb(k) of a frequency modulated signal is limited in order to reduce co-channel interference. The limiting is performed efficiently in a digital signal processor by determining a ratio r with a magnitude less than one, equal to b(k)/a(k) in a first case and a(k)/b(k) in a second case, determining from a look-up table a variable p with a magnitude equal to 1/.sqroot.1+r.sup.2 , and determining a number equal to sgn(a(k))p(1+jr) in the first case and sgn(b(k))p(r+j) in the second case as the limited output signal sample.

REFERENCES:
patent: 4293856 (1981-10-01), Chressanthis et al.
patent: 4797067 (1989-01-01), Jagodnik, Jr. et al.
patent: 5289194 (1994-02-01), Schlosser
patent: 5311555 (1994-05-01), Ichiyoshi
patent: 5499399 (1996-03-01), Bond et al.
patent: 5604503 (1997-02-01), Fowler et al.

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