Demodulators – Phase shift keying or quadrature amplitude demodulator
Patent
1998-06-11
2000-04-04
Lee, Benny
Demodulators
Phase shift keying or quadrature amplitude demodulator
329317, 375324, H03D 300
Patent
active
060466294
ABSTRACT:
In a demodulating method of demodulating amplitude-demodulated signals in an amplitude phase shift keying system for conducting an amplitude modulation by setting signal points as information codes on a complex plane representing a signal space of transmission signals onto circumferences of two concentric circles including a first circle having a first diameter and a second circle having a second diameter smaller than the first diameter on the complex plane, there are obtained, in accordance with an amplitude value of an amplitude component of each symbol of a received amplitude-modulated signal, a first threshold value and a second threshold value having a predetermined relationship with the amplitude value. Next, the amplitude value the an amplitude component of each symbol of the successively received amplitude-modulated signal is compared with the first and second first threshold values to determine an amplitude variation in the amplitude component of each symbol in accordance with a result from the comparison so as to output therefrom a signal representing the determination result as a code obtained by demodulating the amplitude component.
REFERENCES:
patent: 4484154 (1984-11-01), Pavin
patent: 5023948 (1991-06-01), Smith
patent: 5162937 (1992-11-01), Heidemann et al.
patent: 5363849 (1994-11-01), Suorsa et al.
Akiyama Toshiyuki
Miyashita Atsushi
Moriyama Shigeki
Sano Seiichi
Tsuchida Kenichi
Choe Henry
Hitachi , Ltd.
Lee Benny
LandOfFree
Method of an apparatus for demodulating amplitude-modulated sign does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of an apparatus for demodulating amplitude-modulated sign, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of an apparatus for demodulating amplitude-modulated sign will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-369189