Distortion compensating device
AssigneeFujitsu Limited
InventorsTakanori Iwamatsu, Kenzo Kobayashi, Takayuki Ozaki
Life of this patent
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Abstract
A distortion compensating device provided in a receiver for compensating distortion which is added to a signal in a transmission path. The signal is generated in a multi-level modulator of a transmitter in which a digital signal is mapped to one of a plurality of specified signal points in a signal space diagram. The device includes a signal-point-position averaging circuit for producing an average signal point for each of a plurality of distributions of received signal points in the signal space diagram. A discrimination circuit in the device discriminates the average signal point closest to a received signal point from other average signal points in the signal space diagram.
Claims6
A distortion compensating device provided in a receiver for compensating distortion added to a signal in a transmission path, said signal being generated in a multi-level modulator of a transmitter in which a digital signal is mapped to one of a plurality of specified signal points in a signal space diagram, said distortion compensation device comprising:
- distortion-compensated signal calculating means for producing a distortion-compensated signal S based on an equation
- S=V−α1V−α2V2 −α3V3. . .,
- where V denotes a received signal, and αn is a given factor;
- and
- discrimination means for discriminating the distortion-compensated signal S based on a threshold.
A distortion compensating device provided in a receiver for compensating distortion added to a signal in a transmission path, said signal being generated in a multi-level modulator of a transmitter in which a digital signal is mapped to one of a plurality of specified signal points in a signal space diagram, said distortion compensation device comprising:
- a circuit section producing a distortion-compensated signal S based on an equation
- S=V−α1V−α2V2 −α3V3. . .,
- where V denotes a received signal, and αn denotes a given factor;
- and
- a discrimination circuit discriminating the distortion-compensated signal S based on a threshold.
Dependencies are inferred from the claim text.