Procedure for simultaneous transmission in time and frequency of multiple communications of data by means of OFDM modulations

1. A system, comprising:

a first network device configured to transmit a first starting signal;

a second network device configured to transmit a second starting signal, wherein at least one of the first network device and the second network device is further configured to change a ratio between at least one of i) respective phases of carriers of the first starting signal and the second starting signal, and ii) respective amplitudes of the carriers of the first starting signal and the second starting signal; and

a third network device configured to

i) receive the first starting signal and the second starting signal,

ii) selectively allow communication with the first network device based on the ratio,

iii) ignore communication from the second network device based on the ratio,

iv) selectively allow communication with the first network device further based on a frequency of the first starting signal and a frequency of the second starting signal, and

v) ignore communication from the second network device further based on the frequency of the first starting signal and the frequency of the second starting signal.

2. The system of claim 1 , wherein the first starting signal and the second starting signal are transmitted and received using a first channel.

3. The system of claim 1 , wherein the frequency of the first starting signal is shifted a fraction of a separation between OFDM carriers of the first starting signal and the second starting signal.

4. The system of claim 1 , wherein the first network device and the second network device are slave network devices, and wherein the third network device is a master network device.

5. The system of claim 1 , wherein the first network device and the third network device are in a first network, and wherein the second network device is in a second network.

6. The system of claim 1 , wherein the third network device is configured to selectively allow communication with the first network device further based on at least one of a time shift, symmetry characteristics, a duration of repetitions, and a number of repetitions of the first starting signal and the second starting signal.

7. The system of claim 1 , wherein the third network device is configured to selectively allow communication with the first network device further based on a determination that a frequency of the first starting signal corresponds to a desired frequency.

8. The system of claim 1 , wherein the third network device is configured to ignore communication from the second network device further based on a determination that the frequency of the second starting signal does not correspond to a desired frequency.

9. A method, comprising:

transmitting, from a first network device, a first starting signal;

transmitting, from a second network device, a second starting signal;

changing a ratio between at least one of i) respective phases of carriers of the first starting signal and the second starting signal, and ii) respective amplitudes of the carriers of the first starting signal and the second starting signal; and

using a third network device,

i) receiving the first starting signal and the second starting signal,

ii) selectively allowing communication with the first network device based on the ratio and further based on a frequency of the first starting signal and a frequency of the second starting signal,

iii) ignoring communication from the second network device based on the ratio, and

iv) ignoring the communication from the second network device further based on the frequency of the first starting signal and the frequency of the second starting signal.

10. The method of claim 9 , wherein the first starting signal and the second starting signal are transmitted and received using a first channel.

11. The method of claim 9 , further comprising shifting the frequency of the first starting signal a fraction of a separation between OFDM carriers of the first starting signal and the second starting signal.

12. The method of claim 9 , wherein the first network device and the second network device are slave network devices, and wherein the third network device is a master network device.

13. The method of claim 9 , wherein the first network device and the third network device are in a first network, and wherein the second network device is in a second network.

14. The method of claim 9 , wherein selectively allowing the communication with the first network device includes:

selectively allowing the communication with the first network device further based on at least one of a time shift, symmetry characteristics, a duration of repetitions, and a number of repetitions of the first starting signal and the second starting signal.

15. The method of claim 9 , wherein selectively allowing the communication with the first network device includes:

selectively allowing the communication with the first network device further based on a determination that a frequency of the first starting signal corresponds to a desired frequency.

16. The method of claim 9 , wherein ignoring the communication from the second network device includes:

ignoring the communication from the second network device further based on a determination that a frequency of the second starting signal does not correspond to a desired frequency.