Receiver having integrated spectral analysis capability

• US 20030021237A1
• Filed: 06/07/2002
• Published: 01/30/2003
• Est. Priority Date: 06/08/2001
• Status: Active Grant

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Min, Jonathan S., Currivan, Bruce J., Eddy, Kevin, Lu, Fang
• Granted Patent: US 7,804,772 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/203 Details of error rate determination, e.g. BER, FER or WER
• CPC Class Codes: H04L 1/206 for modulated signals
• CPC Class Codes: H04L 25/08 Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
• CPC Class Codes: H04L 43/0823 Errors, e.g. transmission errors

Abstract

A method of managing traffic in a communications channel includes the steps of receiving a subscriber ID corresponding to a subscriber, performing a spectral analysis on a signal received from the subscriber within a time interval identified by the subscriber ID, and adjusting transmission characteristics of the subscriber based on the spectral analysis.

Claims

1. A method of managing traffic in a communications channel comprising the steps of:

receiving a subscriber ID corresponding to a subscriber;

performing a spectral analysis on a signal received from the subscriber within a time interval corresponding to the subscriber ID; and

adjusting transmission characteristics of the subscriber based on the spectral analysis.

2. The method of claim 1, wherein said adjusting step adjusts transmission power of the subscriber.

3. The method of claim 1, wherein said adjusting step adjusts symbol rate of the subscriber.

4. The method of claim 1, wherein said adjusting step adjusts forward error correction parameters of the subscriber.

5. The method of claim 1, wherein said adjusting step adjusts packet type of the subscriber.

6. The method of claim 1, wherein said adjusting step adjusts modulation type of the subscriber.

7. The method of claim 1, wherein said step of performing the spectral analysis includes the step of performing a Discrete Fourier Transform (DFT).

8. The method of claim 1, wherein said step of performing the spectral analysis includes the step of extracting burst noise information from the packet.

9. The method of claim 1, wherein said step of performing the spectral analysis includes the step of calculating channel signal-to-noise information.

10. The method of claim 1, wherein said step of performing the spectral analysis includes the step of performing a Fast Fourier Transform (FFT).

11. The method of claim 10, wherein said step of performing the FFT uses a radix 2 decimation-in-time algorithm.

12. The method of claim 10, wherein said step of performing the FFT uses a windowing algorithm.

13. The method of claim 10, wherein said step of performing the FFT uses multiple-FFT-averaging.

14. The method of claim 1, wherein the time interval corresponds to an empty noise slot.

15. The method of claim 1, wherein the subscriber ID is a null ID.

16. The method of claim 1, wherein the signal represents an entire packet.

17. The method of claim 1, wherein the signal represents a portion of a packet.

18. The method of claim 1, wherein the signal represents a plurality of packets.

19. A method of controlling transmission in a communications channel comprising the steps of:

receiving a subscriber ID identifying a time interval corresponding to a subscriber;

performing a spectral analysis on a signal received during the time interval identified by the subscriber ID; and

adjusting transmission characteristics of the subscriber based on the spectral analysis.

20. The method of claim 19, wherein said adjusting step adjusts transmission power of the subscriber.

21. The method of claim 19, wherein said adjusting step adjusts symbol rate of the subscriber.

22. The method of claim 19, wherein said adjusting step adjusts forward error correction parameters of the subscriber.

23. The method of claim 19, wherein said adjusting step adjusts packet burst type of the subscriber.

24. The method of claim 19, wherein said adjusting step adjusts modulation type of the subscriber.

25. The method of claim 19, wherein said step of performing the spectral analysis includes the step of performing a DFT.

26. The method of claim 19, wherein said step of performing the spectral analysis includes the step of extracting burst noise information from the packet.

27. The method of claim 19, wherein said step of performing the spectral analysis includes the step of calculating channel signal-to-noise information.

28. The method of claim 19, wherein said step of performing the spectral analysis includes the step of performing an FFT.

29. The method of claim 28, wherein said step of performing the FFT uses a radix 2 decimation-in-time algorithm.

30. The method of claim 28, wherein said step of performing the FFT uses a windowing algorithm.

31. The method of claim 28, wherein said step of performing the FFT includes multiple-FFT-averaging.

32. The method of claim 19, wherein the time interval corresponds to an empty noise slot.

33. The method of claim 19, wherein the subscriber ID is a null ID.

34. The method of claim 19, wherein, in said receiving step, the subscriber ID identifies a plurality of time intervals corresponding to the subscriber;

and

wherein, in said performing step, the spectral analysis is performed on a plurality of packets received during the plurality of time intervals identified by the subscriber ID.

35. The method of claim 19, wherein the signal represents an entire packet.

36. The method of claim 19, wherein the signal represents a portion of a packet.

37. The method of claim 19, wherein the signal represents a plurality of packets.

38. A shared communications channel receiver comprising:

a burst receiver;

a spectrum analyzer that analyzes a signal received by the burst receiver; and

a controller interface that receives a command from a media access controller,

wherein the spectrum analyzer provides a spectral analysis of the signal received by the burst receiver, the signal corresponding to a subscriber ID provided by the command from the media access controller.

39. The shared communications channel receiver of claim 38, wherein transmission power of a subscriber corresponding to the subscriber ID is adjusted based on the spectral analysis.

40. The shared communications channel receiver of claim 38, wherein a symbol rate of a subscriber corresponding to the subscriber ID is adjusted based on the spectral analysis.

41. The shared communications channel receiver of claim 38, wherein forward error correction parameters of a subscriber corresponding to the subscriber ID are adjusted based on the spectral analysis.

42. The shared communications channel receiver of claim 38, wherein a burst type of a subscriber corresponding to the subscriber ID is adjusted based on the spectral analysis.

43. The shared communications channel receiver of claim 38, wherein a modulation type of a subscriber corresponding to the subscriber ID is adjusted based on the spectral analysis.

44. The shared communications channel receiver of claim 38, wherein the spectral analysis includes a DFT.

45. The shared communications channel receiver of claim 38, wherein the spectral analysis extracts burst noise information from a packet received during a time interval corresponding to the subscriber ID.

46. The shared communications channel receiver of claim 38, wherein the spectral analysis calculates channel signal-to-noise information.

47. The shared communications channel receiver of claim 38, wherein the spectral analysis includes an FFT.

48. The shared communications channel receiver of claim 47, wherein the FFT is performed using a radix 2 decimation-in-time algorithm.

49. The shared communications channel receiver of claim 47, wherein the FFT is performed using a windowing algorithm.

50. The shared communications channel receiver of claim 47, wherein the FFT is performed using a multiple-FFT-averaging algorithm.

51. The shared communications channel receiver of claim 38, wherein the burst receiver receives the signal from a TDMA system.

52. The shared communications channel receiver of claim 38, wherein the burst receiver receives the signal from an FDMA system.

53. The shared communications channel receiver of claim 38, wherein the burst receiver receives the signal from a TDMA/FDMA system.

54. The shared communications channel receiver of claim 38, wherein the signal represents an entire packet.

55. The shared communications channel receiver of claim 38, wherein the signal represents a portion of a packet.

56. The shared communications channel receiver of claim 38, wherein the signal represents a plurality of packets.

57. A method of controlling communications traffic across an upstream traffic channel comprising the steps of:

specifying a spectral analysis time interval corresponding to a subscriber ID;

receiving an upstream transmission within the spectral analysis time interval;

performing a spectral analysis of the received upstream transmission; and

adjusting a transmission characteristic of the upstream traffic channel based on the spectral analysis.

58. The method of claim 57, wherein said step of specifying comprises the step of identifying a time interval corresponding to an upstream transmission from a subscriber corresponding to the subscriber ID.

59. The method of claim 58, wherein the time interval corresponds to an empty noise slot.

60. The method of claim 57, wherein the subscriber ID is a null ID.

61. The method of claim 57, wherein said step of specifying comprises the step of specifying at least one time division multiple access (TDMA) mini-slot.

62. The method of claim 57, wherein said step of performing comprises the step of generating a Discrete Fourier Transform (DFT) sequence from the upstream transmission.

63. The method of claim 57, wherein said step of adjusting comprises the step of changing an upstream transmission symbol rate.

64. The method of claim 57, wherein said step of adjusting comprises the step of changing an upstream transmission modulation type.

65. The method of claim 57, wherein said step of adjusting comprises the step of changing an upstream transmission power level.

66. The method of claim 57, wherein said step of specifying the spectral analysis time interval includes the step of specifying a plurality of time intervals corresponding to the subscriber ID.

67. A receiver comprising:

a communications module that receives an upstream transmission from a shared communications medium;

a controller interface that receives a transmission schedule and a spectral analysis command; and

a spectral analysis processor that performs spectral analysis on the upstream transmission in response to the spectral analysis command.

68. The receiver of claim 67, wherein the shared communications medium is a time division multiple access (TDMA) communications medium.

69. The receiver of claim 67, wherein the upstream transmission represents an entire packet.

70. The receiver of claim 67, wherein the upstream transmission represents a portion of a packet.

71. The receiver of claim 67, wherein the upstream transmission represents a plurality of packets.

72. A method of controlling communications traffic across a traffic channel comprising the steps of:

specifying a time interval corresponding to a subscriber;

receiving an upstream transmission within the time interval; and

performing a spectral analysis of the received upstream transmission.

73. The method of claim 72, wherein said step of specifying comprises the step of identifying a time interval corresponding to an upstream transmission from the subscriber based on a subscriber ID.

74. The method of claim 73, wherein the time interval corresponds to an empty noise slot.

75. The method of claim 73, wherein the subscriber ID is a null ID.

76. The method of claim 72, wherein said step of specifying comprises the step of specifying a time division multiple access (TDMA) mini-slot.

77. The method of claim 72, wherein said step of specifying comprises the step of specifying a plurality of time division multiple access (TDMA) mini-slots.

78. The method of claim 72, wherein said step of performing comprises the step of generating a Discrete Fourier Transform (DFT) sequence from the upstream transmission.

79. The method of claim 72, further comprising the step of adjusting at least one transmission characteristic of the subscriber based on the spectral analysis.

80. The method of claim 79, wherein said step of adjusting comprises the step of changing an upstream transmission symbol rate.

81. The method of claim 79, wherein said step of adjusting comprises the step of changing an upstream transmission modulation type.

82. The method of claim 79, wherein said step of adjusting comprises the step of changing an upstream transmission power level.

83. The method of claim 72, wherein the upstream transmission represents an entire packet.

84. The method of claim 72, wherein the upstream transmission represents a portion of a packet.

85. The method of claim 72, wherein the upstream transmission represents a plurality of packets.

86. A burst receiver having integrated spectral analysis capability comprising:

a communications module that receives upstream transmissions over a shared communications medium;

a controller interface that receives a subscriber transmission schedule and a spectral analysis command; and

a spectral analysis processor that performs spectral analysis on the upstream transmissions corresponding to the subscriber transmission schedule in response to the spectral analysis command.

87. A method of controlling communications traffic across a shared traffic channel comprising the steps of:

specifying a TDMA time interval;

receiving a transmission within the TDMA time interval;

performing a spectral analysis of the transmission; and

adjusting at least one transmission characteristic of the shared traffic channel based on the spectral analysis.

88. The method of claim 87, wherein said step of specifying comprises the step of identifying a time interval corresponding to an upstream transmission from a particular subscriber.

89. The method of claim 87, wherein said step of specifying comprises the step of identifying a plurality of time intervals corresponding to an upstream transmission from a particular subscriber.

90. The method of claim 87, wherein said step of performing comprises the step of generating a Discrete Fourier Transform (DFT) sequence from the upstream transmission.

91. The method of claim 87, wherein said step of adjusting comprises the step of changing an upstream transmission symbol rate of a particular subscriber.

92. The method of claim 87, wherein said step of adjusting comprises the step of changing an upstream transmission modulation type of a particular subscriber.

93. The method of claim 87, wherein said step of adjusting comprises the step of changing an upstream transmission power level of a particular subscriber.

94. The method of claim 87, wherein the TDMA time interval corresponds to an empty noise slot.

95. The method of claim 87, wherein the transmission represents an entire packet.

96. The method of claim 87, wherein the transmission represents a portion of a packet.

97. The method of claim 87, wherein the transmission represents a plurality of packets.

98. A TDMA receiver comprising:

a burst receiver that receives a transmission over a shared communications medium;

a controller interface that receives a subscriber ID and a spectral analysis command; and

a spectral analysis processor that performs spectral analysis on the transmission corresponding to the subscriber ID in response to the spectral analysis command.

99. A TDMA receiver comprising:

a burst receiver;

an interface module for interfacing to a media access controller and for receiving a subscriber ID corresponding to a subscriber; and

a spectrum analyzer for analyzing signals received by the burst receiver in time intervals allocated to the subscriber ID.

100. The TDMA receiver of claim 99, wherein the spectrum analyzer includes an FFT processor.

101. The TDMA receiver of claim 99, wherein the spectrum analyzer includes quadrature mirror filter banks.

102. The TDMA receiver of claim 99, wherein the spectrum analyzer includes a DFT processor.

103. The TDMA receiver of claim 99, wherein the spectrum analyzer includes wavelet filter banks.

104. The TDMA receiver of claim 99, wherein the time intervals are reservation slots.

105. The TDMA receiver of claim 99, wherein the time intervals are contention slots.

106. The TDMA receiver of claim 99, wherein the time intervals are maintenance slots.

107. The TDMA receiver of claim 99, wherein the subscriber ID is a null ID.