Distortion compensating device

Details Distortion compensating device Distortion compensating device

2006-01-17

2006-01-17

Tse, Young T. (Department: 2637)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S221000, C375S261000, C455S126000

Reexamination Certificate

active

06987814

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.

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