Method for operating multiple overlapping wireless networks

• US 20040142663A1
• Filed: 07/22/2003
• Published: 07/22/2004
• Est. Priority Date: 02/20/2002
• Status: Active Grant

• Current Assignee: North Star Innovations Inc. (Wi-LAN Inc.)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Roberts, Richard D.
• Granted Patent: US 7,184,719 B2
• Time in Patent Office: Days
• US Class Current: 455/73
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 1/7172 Pulse shape in general H04L25/03834
• CPC Class Codes: H04B 1/7176 Data mapping, e.g. modulation
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2042 with more than two phase states
• CPC Class Codes: H04L 27/2278 using correlation techniques, e.g. for spread spectrum signals
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

A method is provided for operating a plurality of overlapping wireless networks such that they do not interfere with each other. This is accomplished by having each network transmit at a frequency that is offset from a base frequency by an integer multiple of an offset frequency. The offset frequency is generally a small fraction of the base frequency so that the spectral properties of each network are roughly the same. However, each network will transmit at a unique frequency with respect to all of the other overlapping networks. The offset values are preferably symmetrical around zero, and the offset for one network can be zero.

Claims

1. A method of operating a plurality of wireless networks, comprising:

transmitting first signals in a first network at a first carrier frequency;

transmitting second signals in a second network at a second carrier frequency, the second carrier frequency being different from the first carrier frequency,

wherein the first carrier frequency is offset from a base carrier frequency by an amount equal to n times an offset frequency,

wherein the second carrier frequency is offset from the base carrier frequency by an amount equal to m times the offset frequency,

wherein n is an integer, m is an integer, and m does not equal n.

2. A method of operating a plurality of wireless networks, as recited in claim 1, wherein n is 1 and m is −

1

3. A method of operating a plurality of wireless networks, as recited in claim 1, wherein the base carrier frequency is between 2 and 9 GHz.

4. A method of operating a plurality of wireless networks, as recited in claim 3, wherein the base carrier frequency is between 3.5 and 4.5 GHz.

5. A method of operating a plurality of wireless networks, as recited in claim 4, wherein the base carrier frequency is about 4.104 GHz.

6. A method of operating a plurality of wireless networks, as recited in claim 3, wherein the base carrier frequency is between 7.5 and 8.5 GHz.

7. A method of operating a plurality of wireless networks, as recited in claim 4, wherein the base carrier frequency is about 8.208 GHz.

8. A method of operating a plurality of wireless networks, as recited in claim 3, wherein the offset frequency is between 1 and 10 MHz.

9. A method of operating a plurality of wireless networks, as recited in claim 8, wherein the offset frequency is about 3 MHz.

10. A method of operating a plurality of wireless networks, as recited in claim 1, further comprising:

forming the first signals out of first pulses formed of p cycles of a first oscillating signal operating at a first oscillating frequency; and

forming the second signals out of second pulses formed of p cycles of a second oscillating signal operating at a second oscillating frequency,

wherein the first oscillating frequency is offset from a base oscillating frequency by an amount equal to

$\frac{n}{p}$

times the offset frequency, and

wherein the second oscillating frequency is offset from a base oscillating frequency by an amount equal to

$\frac{m}{p}$

times the offset frequency.

11. A method of operating a plurality of wireless networks, as recited in claim 1, wherein p is 3.

12. A method of operating a plurality of wireless networks, as recited in claim 1, wherein the plurality of wireless networks are ultrawide bandwidth networks.

13. A method of operating a plurality of wireless networks, comprising:

transmitting first through k^th signals in first through k^th networks at first through k^th carrier frequencies, respectively; and

offsetting the i^th carrier frequency from a base carrier frequency by an amount equal to n_i times an offset frequency,

wherein k is an integer greater than 1,

wherein i varies from 1 to k, and

wherein none of n₁ through n_i has the same integer value.

14. A method of operating a plurality of wireless networks, as recited in claim 13, wherein k is 4.

15. A method of operating a plurality of wireless networks, as recited in claim 14 wherein n₁ is −

2, n₂ is −

1, n₃ is 1, and n₄ is 2.

16. A method of operating a plurality of wireless networks, as recited in claim 13, wherein the base carrier frequency is between 2 and 9 GHz.

17. A method of operating a plurality of wireless networks, as recited in claim 16, wherein the base carrier frequency is between 3.5 and 4.5 GHz.

18. A method of operating a plurality of wireless networks, as recited in claim 17, wherein the base carrier frequency is about 4.104 GHz.

19. A method of operating a plurality of wireless networks, as recited in claim 16, wherein the base carrier frequency is between 7.5 and 8.5 GHz.

20. A method of operating a plurality of wireless networks, as recited in claim 19, wherein the base carrier frequency is about 8.208 GHz.

21. A method of operating a plurality of wireless networks, as recited in claim 16, wherein the offset frequency is between 1 and 10 MHz.

22. A method of operating a plurality of wireless networks, as recited in claim 21, wherein the offset frequency is about 3 MHz.

23. A method of operating a plurality of wireless networks, as recited in claim 13, wherein k is 3.

24. A method of operating a plurality of wireless networks, as recited in claim 13, wherein n₁ is −

1, n₂ is 0, and n₃ is 1.

25. A method of operating a plurality of wireless networks, as recited in claim 13, further comprising:

forming the i^th signals out of pulses formed of p cycles of an i^th oscillating signal operating at an i^th oscillating frequency,

wherein the i^th oscillating frequency is offset from a base oscillating frequency by an amount equal to

$\frac{n_i}{p}$

times the offset frequency.

26. A method of operating a plurality of wireless networks, as recited in claim 13, wherein p is 3.

27. A method of operating a plurality of wireless networks, as recited in claim 13, wherein the plurality of wireless networks are ultrawide bandwidth networks.