High bitrate downhole telemetry system using two independent channels on a multi-conductor cable

A method of transmitting telemetry data, comprising:

• receiving, by first transceiver module, the telemetry data from a downhole logging module of a downhole tool:
• encoding, by the first transceiver module, the telemetry data received by the first transceiver module as at least two channels of independent data;
• applying electrical signals, by the first transceiver module, to conductors of a downhole cable based on the encoded telemetry data, wherein said applying the electrical signals comprises:
• said applying the electrical signals corresponding to the encoded telemetry data for a first channel of the at least two channels of independent data to at least a first one of the conductors of the downhole cable according to a first transmission mode, and
• said applying the electrical signals corresponding to the encoded telemetry data of a second channel of the at least two channels of independent data to at least a second one of the conductors of the downhole cable according to a second transmission mode;
• transmitting, by the first transceiver module, the electrical signals corresponding to the encoded telemetry data for the first channel in the first transmission mode and the electrical signals corresponding to the encoded telemetry data for the second channel in the second transmission mode over the downhole cable to a second transceiver module at an opposite end of the downhole cable;
• detecting, by the second transceiver module, the electrical signals transmitted by the first transceiver module;
• canceling, by the second transceiver module, crosstalk interference induced on the conductors of the downhole cable;
• and
• decoding, by the second transceiver module, the detected electrical signals with the crosstalk interference canceled,
• wherein the first transmission mode is orthogonal to the second transmission mode.

A telemetry system comprising:

• a cable comprising a plurality of conductors;
• a transmitter module coupled to one end of the cable comprising:
• a receiver arranged to receive telemetry data from a downhole module of a downhole tool;
• an encoder arranged to encode the telemetry data received by the receiver from the downhole tool as at least two channels of independent data;
• and
• a signal generator coupled to input portions of the conductors, the signal generator arranged to apply electrical signals to the conductors based on the encoded telemetry data,
• wherein the signal generator is arranged to:
• said apply the electrical signals corresponding to the encoded telemetry data of a first channel of the at least two channels of independent data to a first plurality of the conductors for transmission over the cable, and
• said apply the electrical signals corresponding to the encoded telemetry data of a second channel of the at least two channels of independent data to a second plurality of the conductors different than the first plurality of the conductors for transmission over the cable:
• and
• a receiver module coupled to another end of the cable comprising:
• a signal detector coupled to output portions of the conductors, the signal detector arranged to detect the electrical signals transmitted by the transmitter module over the cable;
• a signal processor configured to cancel crosstalk interference induced on the first and second plurality of conductors of the cable;
• and
• a decoder arranged to decode the detected electrical signals with the crosstalk interference canceled,
• wherein the telemetry system is a downhole telemetry system.