Method for increasing the performance of a communications system on a medium formed by multiple conductors

1. A method for operating a communication system communicating via a transmission medium formed by multiple conductors, wherein the transmission medium is an electric network formed by N conductors and a reference plane, the method comprising:

identifying N modes that can be applied on the transmission medium, wherein a mode is an injection mode selected from voltage injection and current injection on a medium selected from the N conductors, the reference plane, or a combination of both, and wherein the N modes are orthogonal to each other;

selecting up to N modes to be used in the communication system from the N modes identified on the transmission medium;

injecting communication signals in the selected modes; and

transmitting multiple versions of the communication signals in the modes used,

wherein the multiple versions of the communication signals are combined at reception to improve reliability of communication.

2. The method of claim 1 , further comprising simultaneously injecting up to N modes, wherein the N modes include differential modes, pseudo-differential modes, and a common mode, to multiply a transmission capacity in the communication system without using additional digital processing.

3. The method of claim 1 further comprising simultaneously injecting up to N modes on the same bandwidth or frequency range.

4. The method of claim 1 , wherein the communication system uses repeaters including filters to cancel out interferences between different bands, wherein the repeaters use different modes from among the N modes to relax specifications of the filters or to eliminate functionality thereof and to reduce interference between signals transmitted by the repeaters.

5. The method of claim 1 , wherein the communication system comprises pieces of equipment reusing the same frequencies without causing interference among each other by using different injection modes to obtain greater flexibility in reusing frequency ranges in planning of communication networks.

6. The method of claim 1 , further comprising applying a multiple-input multiple-output (MIMO) digital processing of the communication signals in the modes used from among the N modes to improve performance of communication.

7. The method of claim 6 , further comprising additionally applying techniques for transmission through channel eigenvectors at transmission and reception to allow a receiver to decode signals received through each of the modes used.

8. The method of claim 6 , further comprising additionally applying techniques for canceling interference between the modes used at reception to increase signal-to-noise ratio (SNR) detected in each of the modes.

9. The method of claim 1 , wherein the communication system includes multiple pieces of equipment, wherein a piece of equipment transmits signals simultaneously to other pieces of equipment using a set of, wherein the sets are disjunctive.

10. The method of claim 1 , wherein the communication system includes multiple pieces of equipment, wherein a piece of equipment receives signals simultaneously from other pieces of equipment using a set of modes, wherein the sets are disjunctive.

11. The method of claim 1 , further comprising using only the modes having best characteristics for communication to increase robustness and performance of the communication system.

12. The method of claim 11 , wherein communication characteristics which allow selecting the modes, are selected from:

noise present in a mode,

interference present in a mode,

stability of channel in a mode,

radiation caused by a mode,

attenuation of channel in a mode, and

a combination of the one or more of the above.

13. The method of claim 1 , wherein orthogonal frequency division multiplexing (OFDM) modulation is used, the method comprises using, in groups formed by at least one OFDM modulation carrier, an option from the group consisting of:

different techniques for digital processing for each group,

different injection modes for each group, and

a combination of one or more of the above options.

14. A method for operating a communication system configured to communicate via a transmission medium formed by multiple conductors, wherein the transmission medium is an electric network formed by N conductors and a reference plane, the method comprising:

identifying N modes that can be applied on the transmission medium, wherein a mode is an injection mode selected from voltage injection and current injection on a medium selected from the N conductors, the reference plane, or a combination of both, and wherein the N modes are orthogonal to each other;

selecting up to N modes to be used in the communication system from the N modes identified on the transmission medium; and

injecting communication signals in the selected modes,

wherein each of a plurality of communication networks coexisting in the same physical medium uses a different set of injection modes from among the N modes, and

wherein the sets of injection modes selected by the plurality of communication networks are disjunctive to increase attenuation between the plurality of communication networks and to improve coexistence of the plurality of communication networks in the same medium.

15. A method for operating a communication system configured to communicate via a transmission medium formed by multiple conductors, wherein the transmission medium is an electric network formed by N conductors and a reference plane, the method comprising:

identifying N modes that can be applied on the transmission medium, wherein a mode is an injection mode selected from voltage injection and current injection on a medium selected from the N conductors, the reference plane, or a combination of both, and wherein the N modes are orthogonal to each other;

selecting up to N modes to be used in the communication system from the N modes identified on the transmission medium;

injecting communication signals in the selected modes;

applying a multiple-input multiple-output (MIMO) digital processing of the communication signals in the modes used from among the N modes to improve performance of communication; and

additionally applying space-time coding techniques including distributing the communication signals among the modes used to exploit coding gain and diversity at the same time.

16. A method for operating a communication system configured to communicate via a transmission medium formed by multiple conductors, wherein the transmission medium is an electric network formed by N conductors and a reference plane, the method comprising:

identifying N modes that can be applied on the transmission medium, wherein a mode is an injection mode selected from voltage injection and current injection on a medium selected from the N conductors, the reference plane, or a combination of both, and wherein the N modes are orthogonal to each other;

selecting up to N modes to be used in the communication system from the N modes identified on the transmission medium; and

injecting communication signals in the selected modes,

wherein the communication system includes two pieces of equipment bidirectionally communicating at the same time via full-duplex communication,

wherein a first piece of equipment uses a first set of injection modes from among the N modes to transmit to a second piece of equipment and a second set of modes to receive signals from the second piece of equipment, and

wherein the second set is different than the first set, and wherein the second piece of equipment uses the first set to receive signals and the second set to transmit signals, wherein the first and second sets are disjunctive.