UWB (Ultra Wide Band) waveform design to minimize narrowband interference

• US 7,554,965 B2
• Filed: 09/23/2003
• Issued: 06/30/2009
• Est. Priority Date: 05/21/2003
• Status: Expired due to Fees

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Karaoguz, Jeyhan
• Primary Examiner(s): Orgad; Edan
• Assistant Examiner(s): Wong; Blanche
• Application Number:
  US10/668,648
• Publication Number:
  US 20040233972A1
• Time in Patent Office: 2,107 Days
• Field of Search: 370/342, 455/465.1
• US Class Current: 370/342
• CPC Class Codes: H04B 1/71635 Transmitter aspects H04B1/7174 takes precedence
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

UWB (Ultra Wide Band) waveform design to minimize narrowband interference. A novel solution is presented such that a PN (Pseudo-Noise) code may be intelligently designed so as to null portions of a UWB spectrum that have a significant amount of noise. These narrowband blocking intervals will effectively block off all of the interference within these portions of the UWB signal. These spectrum portions having interference may be predetermined beforehand or determined by one or more of the devices within the communication system; in addition, any changes in the interference may also be assessed in real time or successively (e.g., after the elapse of every predetermined period of time). Moreover, the position of the devices within the communication system may also be employed when selecting the nulling codes, and they may be adaptively changed, in real time, to respond to changes in the interference and/or changes in the devices'"'"' positions.

Claims

1. A piconet that employs PN (Pseudo-Noise) codes to spread UWB (Ultra Wide Band) pulses to minimize narrowband interference, the piconet comprising:

a PNC (piconet coordinator); and

a plurality of DEVs (user piconet devices); and

wherein;

two devices selected from the plurality of DEVs and the PNC communicate with one another using UWB pulses transmitted across a communication link;

based on narrowband interference within a spectrum of the UWB pulses that are transmitted across the communication link, the PNC assigns a PN code from a plurality of PN codes to spread the UWB pulses transmitted across the communication link;

the assigned PN code has at least one narrowband blocking interval, composed of at least one zero in the assigned PN code, that nulls at least one portion of the spectrum of the UWB pulses around which the narrowband interference is centered thereby eliminating the narrowband interference; and

when transmitting a UWB pulse across the communication link, at least one of the two devices spreads the UWB pulse using the PN code that is assigned from the plurality of PN codes.

2. The piconet of claim 1, wherein:

the narrowband interference is centered around a predetermined frequency.

3. The piconet of claim 2, wherein:

the predetermined frequency is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

4. The piconet of claim 3, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

5. The piconet of claim 4, wherein:

a region in which the IEEE 802.11a WLAN operates is predetermined; and

a region in which the IEEE 802.11b WLAN operates is predetermined.

6. The piconet of claim 1, wherein:

the PNC

transmits a respective UWB pulse to each DEV within the plurality of DEVs;

after receiving its respective UWB pulse, each DEV within the plurality of DEVs transmits at least one additional respective UWB pulse back to the PNC; and

the PNC performs ranging of the relative position of each DEV within the plurality of DEVs using a time duration of a round trip of the respective transmitted UWB pulse and the received at least one additional respective UWB pulse thereby determining the relative distances between the PNC and each DEV within the plurality of DEVs.

7. The piconet of claim 6, wherein:

the PNC assigns the PN code based on the relative distance between the PNC and at least one DEV of the plurality of DEVs.

8. The piconet of claim 6, wherein:

the PNC performs ranging of the relative position of each of the two DEVs of the plurality of DEVs using a time duration of a round trip of a transmitted UWB pulse and a received UWB pulse between them thereby determining the relative distance between the two DEVs of the plurality of DEVs;

one of the two DEVs of the plurality of DEVs provides the ranging information indicating the relative distances between the two DEVs and the PNC; and

the PNC employs the ranging information indicating the relative distances between the PNC and the two DEVs as well as the ranging information indicating the relative distance between the two DEVs to perform triangulation thereby determining the specific locations of the two DEVs with respect to the PNC.

9. The piconet of claim 1, wherein:

the PNC includes GPS (Global Positioning System) functionality that is operable to determine the specific location of the PNC within a degree of precision;

each DEV of the plurality of DEVs includes GPS functionality that is operable to determine the specific location of that DEV within the degree of precision; and

each DEV of the plurality of DEVs communicates information corresponding to its specific location to the PNC.

10. The piconet of claim 9, wherein:

the PNC assigns the PN code based on the specific location of at least one DEV of the plurality of DEVs.

11. The piconet of claim 1, wherein:

the PNC includes interference assessment functionality that is operable to identify a frequency around which the narrowband interference is centered.

12. The piconet of claim 11, wherein:

the PNC and each DEV of the plurality of DEVs operate in a silence mode for a predetermined period of time;

the PNC monitors noise within the piconet when the PNC and each DEV of the plurality of DEVs operate in the silence mode for the predetermined period of time;

the PNC performs an FFT (Fast Fourier Transform) of the noise thereby generating a PSD (Power Spectral Density) of the noise; and

the PNC identifies a peak within the PSD to identify the frequency around which the narrowband interference is centered.

13. The piconet of claim 11, wherein:

the frequency around which the narrowband interference is centered is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

14. The piconet of claim 13, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

15. The piconet of claim 1, wherein:

the UWB pulses are implemented according to CDMA (Code Division Multiple Access).

16. The piconet of claim 1, wherein:

the UWB pulses are implemented according to DSSS (Direct Sequence Spread Spectrum).

17. The piconet of claim 1, wherein:

based on a change in a frequency around which the narrowband interference is centered, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

18. The piconet of claim 1, wherein:

based on a change in a position of at least one of a DEV of the plurality of DEVs and the PNC, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

19. The piconet of claim 1, wherein:

the PNC sets up p2p (peer to peer)communication between two DEVs of the plurality of DEVs; and

at least one additional PN code of the plurality of PN codes is employed to spread the UWB pulses that are transmitted between the two DEVs of the plurality of DEVs that communicate via p2p communication.

20. The piconet of claim 1, wherein:

the UWB pulses are generated using a frequency band of a UWB frequency spectrum that spans from approximately 3.1 GHz (Giga-Hertz) to approximately 10.6 GHz;

the UWB frequency spectrum is divided into a plurality of frequency bands; and

each frequency band of the plurality of frequency bands has a bandwidth of approximately 500 MHz (Mega-Hertz).

21. A piconet that employs PN (Pseudo-Noise) codes to spread UWB (Ultra Wide Band) pulses to minimize narrowband interference, the piconet comprising:

a PNC (piconet coordinator); and

a plurality of DEVs (user piconet devices); and

wherein;

the PNC transmits a respective UWB pulse to each DEV within the plurality of communication devices via a respective communication link of a plurality of communication links that couple the PNC to the plurality of DEVs;

after receiving its respective UWB pulse, each DEV within the plurality of DEVs transmits at least one additional respective UWB pulse back to the PNC;

the PNC performs ranging of the relative position of each DEV within the plurality of DEVs using a time duration of a round trip of the respective transmitted UWB pulse and the received at least one additional respective UWB pulse thereby determining the relative distances between the PNC and each DEV within the plurality of DEVs;

based on narrowband interference within a spectrum of UWB pulses that are transmitted across one respective communication link and based on the relative distance between the PNC and at least one DEV of the plurality of DEVs, the PNC assigns a PN code from a plurality of PN codes to spread the UWB pulses transmitted across the one respective communication link;

the assigned PN code has at least one narrowband blocking interval, composed of at least one zero in the assigned PN code, that nulls at least one portion of the spectrum of the UWB pulses around which the narrowband interference is centered thereby eliminating the narrowband interference; and

when transmitting a UWB pulse across the one respective communication link, at least one DEV of the plurality of DEVs and the PNC spreads the UWB pulse using the PN code that is assigned from the plurality of PN codes.

22. The piconet of claim 21, wherein:

the narrowband interference is centered around a predetermined frequency.

23. The piconet of claim 22, wherein:

the predetermined frequency is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

24. The piconet of claim 23, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

25. The piconet of claim 24, wherein:

a region in which the IEEE 802.11a WLAN operates is predetermined; and

a region in which the IEEE 802.11b WLAN operates is predetermined.

26. The piconet of claim 21, wherein:

the PNC performs ranging of the relative position of each of the DEVs of the plurality of DEVs using a time duration of a round trip of a transmitted UWB pulse and a received UWB pulse between them thereby determining the relative distance between the two DEVs of the plurality of DEVs;

one of the two DEVs of the plurality of DEVs provides the ranging information indicating the relative distances between the two DEVs and the PNC; and

the PNC employs the ranging information indicating the relative distances between the PNC and the two DEVs as well as the ranging information indicating the relative distance between the two DEVs to perform triangulation thereby determining the specific locations of the two DEVs.

27. The piconet of claim 21, wherein:

the PNC includes interference assessment functionality that is operable to identify a frequency around which the narrowband interference is centered.

28. The piconet of claim 27, wherein:

the PNC and each DEV of the plurality of DEVs operate in a silence mode for a predetermined period of time;

the PNC monitors noise within the piconet when the PNC and each DEV of the plurality of DEVs operate in the silence mode for the predetermined period of time;

the PNC performs an FFT (Fast Fourier Transform) of the noise thereby generating a PSD (Power Spectral Density) of the noise; and

the PNC identifies a peak within the PSD to identify the frequency around which the narrowband interference is centered.

29. The piconet of claim 27, wherein:

the frequency around which the narrowband interference is centered is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

30. The piconet of claim 29, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

31. The piconet of claim 21, wherein:

the UWB pulses are implemented according to at least one of CDMA (Code Division Multiple Access) and DSSS (Direct Sequence Spread Spectrum).

32. The piconet of claim 21, wherein:

based on a change in a frequency around which the narrowband interference is centered, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the one respective communication link.

33. The piconet of claim 21, wherein:

based on a change in a position of at least one of a DEV of the plurality of DEVs and the PNC, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the one respective communication link.

34. The piconet of claim 21, wherein:

the PNC sets up p2p (peer to peer) communication between two DEVs of the plurality of DEVs; and

at least one additional PN code of the plurality of PN codes is employed to spread the UWB pulses that are transmitted between the two DEVs of the plurality of DEVs.

35. The piconet of claim 21, wherein:

the UWB pulses are generated using a frequency band of a UWB frequency spectrum that spans from approximately 3.1 GHz (Giga-Hertz) to approximately 10.6 GHz;

the UWB frequency spectrum is divided into a plurality of frequency bands; and

each frequency band of the plurality of frequency bands has a bandwidth of approximately 500 MHz (Mega-Hertz).

36. A piconet that employs PN (Pseudo-Noise) codes to spread UWB (Ultra Wide Band) pulses to minimize narrowband interference, the piconet comprising:

a PNC (piconet coordinator); and

a plurality of DEVs (user piconet devices); and

wherein;

two devices selected from the plurality of DEVs and the PNC communicate with one another using UWB pulses transmitted across a communication link;

based on narrowband interference within a spectrum of the UWB pulses that are transmitted across the communication link, the PNC assigns a PN code from a plurality of PN codes to spread the UWB pulses transmitted across the communication link;

the assigned PN code has at least one narrowband blocking interval, composed of at least one zero in the assigned PN code, that nulls at least one portion of the spectrum of the UWB pulses around which the narrowband interference is centered thereby eliminating the narrowband interference;

when transmitting a UWB pulse across the communication link, at least one of the two devices spreads the UWB pulse using the PN code that is assigned from the plurality of PN codes; and

the PNC includes interference assessment functionality that is operable to identify a frequency around which the narrowband interference is centered.

37. The piconet of claim 36, wherein:

the PNC and each DEV of the plurality of DEVs operate in a silence mode for a predetermined period of time;

the PNC monitors noise within the piconet when the PNC and each DEV of the plurality of DEVs operate in the silence mode for the predetermined period of time;

the PNC performs an FFT (Fast Fourier Transform) of the noise thereby generating a PSD (Power Spectral Density) of the noise; and

the PNC identifies a peak within the PSD to identify the frequency around which the narrowband interference is centered.

38. The piconet of claim 36, wherein:

the frequency around which the narrowband interference is centered is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

39. The piconet of claim 38, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

40. The piconet of claim 36, wherein:

the PNC transmits a respective UWB pulse to each DEV within the plurality of DEVs;

after receiving its respective UWB pulse, each DEV within the plurality of DEVs transmits at least one additional respective UWB pulse back to the PNC; and

the PNC performs ranging of the relative position of each DEV within the plurality of DEVs using a time duration of a round trip of the respective transmitted UWB pulse and the received at least one additional respective UWB pulse thereby determining the relative distances between the PNC and each DEV within the plurality of DEVs.

41. The piconet of claim 40, wherein:

the PNC assigns the PN code based on the relative distance between the PNC and at least one DEV of the plurality of DEVs.

42. The piconet of claim 40, wherein:

the PNC performs ranging of the relative position of each of the two DEVs of the plurality of DEVs using a time duration of a round trip of a transmitted UWB pulse and a received UWB pulse between them thereby determining the relative distances between the two DEVs of the plurality of DEVs;

one of the two DEVs of the plurality of DEVs provides the ranging information indicating the relative distances between the two DEVs and the PNC; and

the PNC employs the ranging information indicating the relative distances between the PNC and the two DEVs as well as the ranging information indicating the relative distance between the two DEVs to perform triangulation thereby determining the specific locations of the two DEVs.

43. The piconet of claim 36, wherein:

the PNC includes GPS (Global Positioning System) functionality that is operable to determine the specific location of the PNC within a degree of precision;

each DEV of the plurality of DEVs includes GPS functionality that is operable to determine the specific location of that DEV within the degree of precision; and

each DEV of the plurality of DEVs communicates information corresponding to its specific location to the PNC.

44. The piconet of claim 43, wherein:

the PNC assigns the PN code based on the specific location of at least one DEV of the plurality of DEVs.

45. The piconet of claim 36, wherein:

based on a change in a frequency around which the narrowband interference is centered, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

46. The piconet of claim 36, wherein:

based on a change in a position of at least one of a DEV of the plurality of DEVs and the PNC, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

47. The piconet of claim 36, wherein:

the UWB pulses are generated using a frequency band of a UWB frequency spectrum that spans from approximately 3.1 GHz (Giga-Hertz) to approximately 10.6 GHz;

the UWB frequency spectrum is divided into a plurality of frequency bands; and

each frequency band of the plurality of frequency bands has a bandwidth of approximately 500 MHz (Mega-Hertz).

48. A piconet that employs PN (Pseudo-Noise) codes to spread UWB (Ultra Wide Band) pulses to minimize narrowband interference, the piconet comprising:

a PNC (piconet coordinator) that operates as a master device; and

a plurality of DEVs (user piconet devices) that operate as slave devices with respect to the PNC that operates as the master device; and

wherein;

two devices selected from the plurality of DEVs and the PNC communicate with one another using UWB pulses transmitted across a communication link;

based on narrowband interference within a spectrum of the UWB pulses that are transmitted across the communication, link the PNC assigns a PN code from a plurality of PN codes to spread the UWB pulses transmitted across the communication link;

the assigned PN code has at least one narrowband blocking interval, composed of at least one zero in the assigned PN code, that nulls at least one portion of the spectrum of the UWB pulses around which the narrowband interference is centered thereby eliminating the narrowband interference;

when transmitting a UWB pulse across the communication link, at least one of the two devices spreads the UWB pulse using the PN code that is assigned from the plurality of PN codes; and

the narrowband interference is centered around a predetermined frequency.

49. The piconet of claim 48, wherein:

the predetermined frequency is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

50. The piconet of claim 49, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

51. The piconet of claim 50, wherein:

a region in which the IEEE 802.11a WLAN operates is predetermined; and

a region in which the IEEE 802.11b WLAN operates is predetermined.

52. The piconet of claim 48, wherein:

the PNC sets up p2p (peer to peer) communication between two DEVs of the plurality of DEVs; and

at least one additional PN code of the plurality of PN codes is employed to spread the UWB pulses that are transmitted between the two DEVs of the plurality of DEVs.

53. The piconet of claim 48, wherein:

based on a change in a frequency around which the narrowband interference is centered, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

54. The piconet of claim 48, wherein:

based on a change in a position of at least one of a DEV of the plurality of DEVs and the PNC, the PNC re-assigns a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

55. The piconet of claim 48, wherein:

the UWB pulses are generated using a frequency band of a UWB frequency spectrum that spans from approximately 3.1 GHz (Giga-Hertz) to approximately 10.6 GHz;

the UWB frequency spectrum is divided into a plurality of frequency bands; and

each frequency band of the plurality of frequency bands has a bandwidth of approximately 500 MHz (Mega-Hertz).

56. A piconet operating method, the method comprising:

assigning a PN (Pseudo-Noise) code that is operable to spread UWB (Ultra Wide Band) pulses that are transmitted across a communication link that communicatively couples two devices within a piconet that includes a plurality of DEVs (user piconet devices) and a PNC (piconet coordinator);

using at least one zero within the PN code, nulling at least a portion of a spectrum of the UWB pulses;

wherein the at least one zero within the PN code spectrally conincides with narrowband interference thereby nulling the narrowband interference; and

operating the communication link that communicatively couples two devices using the assigned PN code.

57. The method of claim 56, wherein:

the narrowband interference is centered around a predetermined frequency.

58. The method of claim 57, wherein:

the predetermined frequency is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

59. The method of claim 58, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

60. The method of claim 59, wherein:

a region in which the IEEE 802.11a WLAN operates is predetermined; and

a region in which the IEEE 802.11b WLAN operates is predetermined.

61. The method of claim 56, further comprising:

determining the relative distance between the PNC and at least one DEV of the plurality of devices within the piconet using ranging that employs a time duration of a round trip of a transmitted UWB pulse and a received UWB pulse between the PNC and the at least one DEV of the plurality of devices; and

assigning the PN code based on the relative distance between the PNC and the at least one DEV of the plurality of DEVs.

62. The method of claim 56, further comprising:

determining the position of each DEV of the plurality of DEVs and the PNC using GPS (Global Positioning System) functionality contained within each DEV of the plurality of DEVs and the PNC;

wherein the GPS (Global Positioning System) functionality is operable to determine the specific location of the respective device within a degree of precision; and

assigning the PN code based on the positions of the PNC and each DEV of the plurality of DEVs.

63. The method of claim 56, further comprising:

based on a change in a frequency around which the narrowband interference is centered, re-assigning a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

64. The method of claim 56, further comprising:

based on a change in a position of at least one of a DEV of the plurality of DEVs and the PNC, re-assigning a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

65. The method of claim 56, further comprising:

performing interference assessment to identify a frequency around which the narrowband interference is centered.

66. The method of claim 65, further comprising:

operating the PNC and each DEV of the plurality of DEVs in a silence mode for a predetermined period of time;

monitoring noise within the piconet when operating the PNC and each DEV of the plurality of DEVs in the silence mode for the predetermined period of time; and

performing an FFT (Fast Fourier Transform) of the noise thereby generating a PSD (Power Spectral Density) of the noise; and

identifying a peak within the PSD to identify the frequency around which the narrowband interference is centered.

67. The method of claim 65, wherein:

the frequency around which the narrowband interference is centered is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

68. The method of claim 67, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

69. A piconet operating method, the method comprising:

assigning a PN (Pseudo-Noise) code that is operable to spread UWB (Ultra Wide Band) pulses that are transmitted across a communication link that communicatively couples two devices within a piconet that includes a plurality of DEVs (user piconet devices) and a PNC (piconet coordinator);

using at least one zero within the PN code, nulling at least a portion of a spectrum of the UWB pulses;

wherein the at least one zero within the PN code spectrally coincides with narrowband interference thereby nulling the narrowband interference; and

operating the communication link that communicatively couples two devices using the assigned PN code; and

wherein the narrowband interference is centered around a predetermined frequency.

70. The method of claim 69, wherein:

the predetermined frequency is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

71. The method of claim 70, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an IEEE 802.11b WLAN.

72. The method of claim 71, wherein:

a region in which the IEEE 802.11a WLAN operates is predetermined; and

a region in which the IEEE 802.11b WLAN operates is predetermined.

73. The method of claim 69, further comprising:

determining the relative distance between the PNC and at least one DEV of the plurality of devices within the piconet using ranging that employs a time duration of a round trip of a transmitted UWB pulse and a received UWB pulse between the PNC and the at least one DEV of the plurality of devices; and

assigning the PN code based on the relative distance between the PNC and the at least one DEV of the plurality of DEVs.

74. The method of claim 69, further comprising:

determining the position of each DEV of the plurality of DEVs and the PNC using GPS (Global Positioning System) functionality contained within each DEV of the plurality of DEVs and the PNC;

wherein the GPS (Global Positioning System) functionality is operable to determine the specific location of the respective device within a degree of precision; and

assigning the PN code based on the positions of the PNC and each DEV of the plurality of DEVs.

75. The method of claim 69, further comprising:

based on a change in a frequency around which the narrowband interference is centered, re-assigning a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

76. The method of claim 69, further comprising:

based on a change in a position of at least one of a DEV of the plurality of DEVs and the PNC, re-assigning a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

77. A piconet operating method, the method comprising:

performing interference assessment of a communication link that communicatively couples two devices within a piconet that includes a plurality of DEVs (user piconet devices) and a PNC (piconet coordinator) to identify a frequency around which the narrowband interference is centered;

assigning a PN (Pseudo-Noise) code that is operable to spread UWB (Ultra Wide Band) pulses that are transmitted across the communication link;

using at least one zero within the PN code, nulling at least a portion of a spectrum of the UWB pulses;

wherein the at least one zero within the PN code spectrally coincides with narrowband interference thereby nulling the narrowband interference; and

operating the communication link that communicatively couples two devices using the assigned PN code.

78. The method of claim 77, further comprising:

operating the PNC and each DEV of the plurality of DEVs in a silence mode for a predetermined period of time;

monitoring noise within the piconet when operating the PNC and each DEV of the plurality of DEVs in the silence mode for the predetermined period of time; and

performing an FFT (Fast Fourier Transform) of the noise thereby generating a PSD (Power Spectral Density) of the noise; and

identifying a peak within the PSD to identify the frequency around which the narrowband interference is centered.

79. The method of claim 77, wherein:

the frequency around which the narrowband interference is centered is at least one of approximately 2.4 GHz (Giga-Hertz) and approximately 5 GHz.

80. The method of claim 79, wherein:

the interference centered around approximately 5 GHz is generated by an IEEE (Institute of Electrical &

Electronics Engineers) 802.11a WLAN (Wireless Local Area Network); and

the interference centered around approximately 2.4 GHz is generated by an ILLL 802.11b WLAN.

81. The method of claim 77, further comprising:

determining the relative distance between the PNC and at least one DEV of the plurality of devices within the piconet using ranging that employs a time duration of a round trip of a transmitted UWB pulse and a received UWB pulse between the PNC and the at least one DEV of the plurality of devices; and

assigning the PN code based on the relative distance between the PNC and the at least one DEV of the plurality of DEVs.

82. The method of claim 77, further comprising:

determining the position of each DEV of the plurality of DEVs and the PNC using GPS (Global Positioning System) functionality contained within each DEV of the plurality of DEVs and the PNC;

wherein the GPS (Global Positioning System) functionality is operable to determine the specific location of the respective device within a degree of precision; and

assigning the PN code based on the positions of the PNC and each DEV of the plurality of DEVs.

83. The method of claim 77, further comprising:

based on a change in a frequency around which the narrowband interference is centered, re-assigning a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.

84. The method of claim 77, further comprising:

based on a change in a position of at least one of a DEV of the plurality of DEVs and the PNC, re-assigning a different PN code of the plurality of PN codes to spread the UWB pulses transmitted across the communication link.