Digital transmission system with symbol encoding which maximizes

Details Digital transmission system with symbol encoding which maximizes Digital transmission system with symbol encoding which maximizes

1996-11-27

1999-06-29

Vo, Don N.

Pulse or digital communications

Pulse code modulation

Noise or distortion reduction

375285, 375296, 375346, H04B 110

Patent

active

059178582

ABSTRACT:
A transmission system wherein a plurality of digital signals are coded and the coded signals are used to amplitude modulate respective carrier waves. The amplitude modulated coded signals are then combined for conveyance over a non-linear transmission medium. Due to the transmission non-linearity there will be distortion of the received combined signal, thereby reducing the transmission capacity of the system. In order to increase the transmission capacity, coding of the digital signals is carried out in accordance with a code such that the amplitude of the modulated carrier for digital symbols of higher probability is reduced in relation to the amplitude thereof for digital symbols of lower probability of occurrence.

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Newton, H., Newton's Telecom Dictionary, 8th Edition. New York: Flatiron Publishing, Inc., p. 165, 1994.
"Coding to Increase Number of Channels in QAM-SCM-IM/DD Lightwave System" by J.H Wu, Y.H. Lee and J. Wu in Electronic Letters, Jan. 2, 1993, vol. 28, No. 1, pp. 65-67.

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