Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1998-01-15
1999-08-10
Le, Amanda T.
Pulse or digital communications
Receivers
Interference or noise reduction
455308, 329321, H04B 110
Patent
active
059370173
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.
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Tong Wen
Wang Rui
Haley R. John
Le Amanda T.
Northern Telecom Limited
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