Patent ID: 7212582
Filing Date: 2007-05-01
Classification: H04L

Abstract:
1. A pulse amplitude modulation (PAM) data communication system comprising: a bits to PAM encoder configured to receive a group of bits and operable to encode the group of bits into discrete voltage level pulses; a precoder coupled to the PAM encoder and configured to receive the discrete voltage pulses and operable to generate precoded symbols, the precoder containing a precoder filter operable on the discrete voltage pulses to compensate for amplitude and phase distortion caused by propagation of a transmitted signal via a communication channel; a spectral shaper contained in the precoder and operable to provide spectral whitening of the precoded symbols by minimizing unwanted signal components; and a pre-filter coupled to the precoder and configured to receive the precoded symbols, the pre-filter having filter coefficients to compensate for channel phase distortion when used in conjunction with the precoder filter, wherein the precoded symbols are transmitted over the communication channel.