Patent ID: 7180825
Filing Date: 2007-02-20
Classification: E21B,G01V

Abstract:
1. A communication system that comprises: a string of wired pipe joints, each pipe joint having: a transmitter coupled to one end of the string to generate a DMT-modulated signal; a receiver coupled to an opposite end of the string to receive and demondulate a DMT-modulated signal; and at least one repeater, each repeater coupled between wired pipe joints in the string, wherein each repeater receives a DMT-modulated signal, recovers information from the DMT-modulated signal, retransmits the information in the form of a DMT-modulated signal, wherein each repeater recovers information from one frequency band of the received DMT-modulated signal, and modulates the information in a different frequency band of the transmitted DMT-modulated signal.