Method and apparatus for equalizing a transmit channel for cable losses in a C8PSK HART system

摘要

A method to adjust a waveform transmitted from a field device to overcome cable bandwidth limitations by passing data to be transmitted through a channel compensation device which pre-distorts data to be transmitted to compensate for the bandwidth limitations. The predistortion may make sure that there is a good quality signal received at the control end of the cable.

主权项

1. A field device in a Highway Addressable Remote Transducer (HART) network, comprising:
an input to receive a command, wherein the command is a HART sequence; a channel estimation device, to compare the received HART sequence with a stored HART sequence of a same type as the received HART sequence, and based on the comparison, to detect channel impairments; a signal processing device, to divide a data stream into symbols, each symbol including a group of three consecutive bits and to generate an outgoing signal; a channel predistorter, to pre-distort the outgoing signal with the channel impairments; and an output to transmit the pre-distorted outgoing signal in response to the command.