Multi-mode, multi-band communication system

• US 6,704,549 B1
• Filed: 01/03/2000
• Issued: 03/09/2004
• Est. Priority Date: 03/03/1999
• Status: Expired due to Term

• Current Assignee: ParkerVision, Inc.
• Original Assignee: ParkerVision, Inc.
• Inventors: Cook, Robert W., Bultman, Michael J., Sorrells, David F., Moses, Charley D. Jr., Looke, Richard C., Hamilla, Joseph M., Clements, Charles D., Silver, Gregory S.
• Primary Examiner(s): Banks-Harold, Marsha D.
• Assistant Examiner(s): MEHRPOUR, NAGHMEH
• Application Number:
  US09/476,330
• Time in Patent Office: 1,527 Days
• Field of Search: 455/118, 455/115.1, 455/103, 455/102, 455/126, 455/127, 455/129, 455/295, 455/110, 455/119, 455/313, 455/323, 455/333, 455/314, 455/20, 455/207, 455/307, 455/553, 455/554, 455/555, 455/114--11, 455/104, 455/108-113, 375/285, 375/346, 375/350
• US Class Current: 455/102
• CPC Class Codes: H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F

Abstract

The present invention is directed toward the transmission subsystem of a multi-mode, multi-band communication system that can transmit and/or receive one or more information signals on one or more transmission frequencies using one or more modulation schemes. According to embodiments of the invention, the up-conversion section is implemented using a universal frequency translator (UFT).

Claims

1. A method of communicating, comprising the steps of:

(1) selecting an information signal from one or more information signals as a selected information signal;

(2) determining a desired frequency for an oscillating signal;

(3) modulating said oscillating with said selected information signal according to a desired modulation scheme to create a modulated oscillating signal;

(4) gating a bias signal at a rate that is a function of said modulated oscillating signal to create an angle modulated harmonically rich signal;

(5) enabling a filter circuit to process said angle modulated harmonically rich signal; and

(6) filtering, in said filter circuit, said angle modulated harmonically rich signal to isolate one or more desired harmonics, each of said one or more desired harmonics being a desired output signal having a desired output frequency,

wherein said gating step is performed by a frequency translation module having a square wave generator that accepts said modulated oscillating signal and generates a square wave, a pulse shaper that accepts said square wave and generates a string of pulses, and a switch being controlled by said string of pulses and being connected to said bias signal and generating said harmonically rich signal, said switch having a first port, a second port, and a control port, wherein said string of pulses is connected to said control port, said bias signal is connected to said first port, and said harmonically rich signal is connected to said second port.

2. The method of claim 1, further comprising the step of:

(7) repeating steps (2)-(6) for another of said one or more information signals.

3. The method of claim 1, wherein step (1) comprises:

(a) accepting said one or more information signals, wherein said one or more information signals are unconditioned information signals,

(b) conditioning each of said unconditioned information signals to generate conditioned information signals, and

(c) selecting one of said conditioned information signals as a selected information signal.

4. The method claim 3, wherein step (1)(b) comprises:

formatting said unconditioned information signals to create conditioned information signals.

5. The method of claim 3, wherein step (1)(b) comprises:

(i) formatting said unconditioned information signals to create a properly formatted information signals, and

(ii) buffering said properly formatted information signals to create conditioned information signals.

6. The method of claim 5, wherein said buffering is a pass-through.

7. The method of claim 3, wherein step (1)(b) comprises:

buffering said unconditioned information signals to create conditioned information signals.

8. The method of claim 1, wherein step (3) comprises:

frequency modulating said oscillating signal with said selected information signal according to a desired modulation scheme to create a modulated oscillating signal.

9. The method of claim 1, wherein step (3) comprises:

phase modulating said oscillating signal with said selected information signal according to a desired modulation scheme to create a modulated oscillating signal.

10. The method of claim 1, wherein said desired frequency for said oscillating signal is a subharmonic of said desired output frequency.

11. The method of claim 1, further comprising the step of:

(7) conditioning said desired output signal to generate a conditioned output signal.

12. The method of claim 11, wherein step (7) comprises:

(a) routing said desired output signal through a driver to generate a driven output signal, and

(b) routing said driven output signal through-a power amplifier to generate an amplified output signal, said amplified output signal being said conditioned output signal.

13. The method of claim 11, further comprising the step of:

(8) transmitting said conditioned output signal.

14. The method of claim 13, wherein step (8) comprises:

transmitting said conditioned output signal from an antenna.

15. The method of claim 11, further comprising the step of:

(8) selecting another of said one or more information signals as said selected information signal, and repeating steps (2) through (7).

16. The method of claim 1, wherein step (4) comprises:

(a) shaping said modulated oscillating signal to create a shaped modulated oscillating signal, and

(b) gating a bias signal at a rate that is a function of said shaped modulated oscillating signal to create a modulated harmonically rich signal.

79. The system of claim 11, wherein said modulation selector comprises a switch, said switch having an input contact, said input contact to accept said selected information signal, said switch further having at least one output contact.

80. The system of claim 79, wherein said switch comprises a first output contact connected to said amplitude modulation path, a second output contact connected to said phase modulation path, and a third output contact connected to said frequency modulation path.

17. A method of communicating, comprising the steps of:

(1) selecting an information signal from one or more information signals as a selected information signal;

(2) determining a desired frequency for an oscillating signal;

(3) combining said selected information signal with a bias signal to create a bias/reference signal;

(4) gating said bias/reference signal at a rate that is a function of said oscillating signal to create an amplitude modulated harmonically rich signal;

(5) enabling a filter circuit to process said amplitude modulated harmonically rich signal; and

(6) filtering, in said filter circuit, said amplitude modulated harmonically rich signal to isolate one or more desired harmonics, each of said one or more desired harmonics being a desired output signal having a desired output frequency,

wherein said gating step is performed by a frequency translation module having a square wave generator that accepts said modulated oscillating signal and generates a square wave, a pulse shaper that accepts said square wave and generates a string of pulses, and a switch being controlled by said string of pulses and being connected to said bias signal and generating said harmonically rich signal, said switch having a first port, a second port, and a control port, wherein said string of pulses is connected to said control port, said bias signal is connected to said first port, said harmonically rich signal is connected to said first port, and a ground is connected to said second port.

18. The method of claim 17, further comprising the step of:

(7) selecting another of said one or more information signals, and repeating steps (2) through (6).

19. The method of claim 17, wherein step (1) comprises:

(a) accepting one or more information signals, wherein said one or more information signals are unconditioned information signals,

(b) conditioning each of said unconditioned information signals to generate conditioned information signals, and

(c) selecting one of said conditioned information signals as a selected information signal.

20. The method of claim 19, wherein step (1)(b) comprises:

formatting said unconditioned information signals to create conditioned information signals.

21. The method of claim 19, wherein step (1)(b) comprises:

(i) formatting said unconditioned information signals to create properly formatted information signals, and

(ii) buffering said properly formatted information signals to create conditioned information signals.

22. The method of claim 21, wherein said buffering is a pass-through.

23. The method of claim 19, wherein step (1)(b) comprises:

buffering said unconditioned information signals to create conditioned information signals.

24. The method of claim 17, wherein said desired frequency for said oscillating signal is a-subharmonic of said desired output frequency.

25. The method of claim 17, further comprising the step of:

(7) conditioning said desired output signal to generate a conditioned output signal.

26. The method of claim 25, wherein step (7) comprises:

(a) routing said desired output signal through a driver to generate a driven output signal, and

(b) routing said driven output signal through a power amplifier to generate an amplified output signal, said amplified output signal being said conditioned output signal.

27. The method of claim 25, further comprising the step of:

(8) transmitting said conditioned output signal.

28. The method of claim 27, wherein step (8) comprises:

transmitting said amplified output signal from an antenna.

29. The method of claim 25, further comprising the step of:

(8) selecting another of said one or more information signals as said selected information signal, and repeating steps (2) through (7).

30. The method of claim 17, wherein step (4) comprises:

(a) shaping said oscillating signal to create a shaped oscillating signal, and

(b) gating a bias/reference signal at a rate that is a function of said shaped oscillating signal to create an amplitude modulated harmonically rich signal.

31. A system for communicating, comprising:

an information signal conditioning module to accept one or more information signals and to output one or more conditioned information signals,

a signal selection module to accept said one or more conditioned information signals and to output a selected information signal,

a modulation and frequency selection module to accept said selected information signal and to output an oscillating signal,

a frequency translation module to accept said oscillating signal and a bias/reference signal, and to output a harmonically rich signal, and

a frequency band selection module to accept said harmonically rich signal and to output one or more desired output signals,

wherein said frequency translation module comprises a square wave generator that accepts said oscillating signal and generates a square wave, a pulse shaper that accepts said square wave and generates a string of pulses, and a switch being controlled by said string of pulses and being connected to said bias/reference signal and generating said harmonically rich signal, and

wherein said switch has a first port, a second port, and a control port, wherein said string of pulses is connected to said control port, said bias/reference signal is connected to said first port, and said harmonically rich signal is connected to said second port.

32. The system of claim 31, wherein said information signal conditioning module comprises one or more format modules and one or more buffer memories, said one or more format modules to accept said one or more information signals and to output formatted information signals, and said one or more buffer memories to accept said formatted information signals and to output conditioned information signals.

33. The system of claim 32, wherein the quantity of said one or more format modules is equal to the quantity of said one or more information signals.

34. The system of claim 32, wherein the quantity of said one or more buffer memories is equal to the quantity of said formatted information signals.

35. The system of claim 32, wherein the quantity of said one or more buffer memories is equal to the quantity of said one or more format modules.

36. The system of claim 31, wherein said information signal conditioning module comprises one or more format modules, said one or more format modules to accept said one or more information signals and to output conditioned information signals.

37. The system of claim 36, wherein the quantity of said one or more format modules is equal to the quantity of said one or more information signals.

38. The system of claim 31, wherein said information signal conditioning module comprises one or more buffer memories, said one or more buffer memories to accept one of said one or more information signals and to output conditioned information signals.

39. The system of claim 38, wherein the quantity of said one or more buffer memories is equal to the quantity of said one or more information signals.

40. The system of claim 31, wherein said modulation and frequency selection module comprises a modulation selector and an oscillating signal generator, said modulation selector to accept said selected information signal and to direct said selected information signal according to a modulation control signal, and said oscillating signal generator to output said oscillating signal according to a frequency control signal.

41. The system of claim 40, wherein said modulation selector accepts said selected information signal and directs said selected information signal to one of an amplitude modulation path, a phase modulation path, and a frequency modulation path, said amplitude modulation path being between said modulation selector and a bias/reference signal module, said bias/reference signal module to output said bias/reference signal, said phase modulation path and said frequency modulation path being between said modulation selector and said oscillating signal generator, said oscillating signal generator to output said oscillating signal.

42. The system of claim 41, wherein said modulation selector comprises a switch, said switch having an input contact, said input contact to accept said selected information signal, said switch further having at least one output contact.

43. The system of claim 42, wherein said switch comprises a first output contact connected to said amplitude modulation path, a second output contact connected to said phase modulation path, and a third output contact connected to said frequency modulation path.

44. The system of claim 40, wherein said oscillating signal generator comprises an oscillator, said oscillator to create said oscillating signal, and wherein said oscillating signal has an oscillating signal frequency that is a subharmonic of the frequency of one of said one or more desired output signals.

45. The system of claim 40, wherein said oscillating signal generator comprises a phase modulator, said phase modulator to create said oscillating signal, said oscillating signal being a phase modulated oscillating signal that is a function of said selected information signal, said phase modulated oscillating signal having an oscillating signal frequency that is a subharmonic of the frequency of one of said one or more desired output signals.

46. The system of claim 40, wherein said oscillating signal generator comprises a frequency modulator, said frequency modulator to create said oscillating signal, said oscillating signal being a frequency modulated oscillating signal that is a function of said selected information signal, said frequency modulated oscillating signal having an oscillating signal frequency that is a subharmonic of the frequency of one of said one or more desired output signals.

47. The system of claim 40, wherein said oscillating signal generator comprises one or more of an oscillator, a phase modulator, and a frequency modulator.

48. The system of claim 31, further comprising a bias/reference signal module to generate said bias/reference signal.

49. The system of claim 48, wherein said bias/reference signal module comprises a summer to accept said selected information signal and combine it with a bias signal to create said bias/reference signal.

50. The system of claim 48, wherein said bias/reference signal is a non-zero voltage that is substantially constant.

51. The system of claim 48, wherein said bias/reference signal module comprises a bias signal and an impedance, said impedance having a first port and a second port, said bias signal being connected to said first port, and wherein said second port outputs said bias/reference signal.

52. The system of claim 48, wherein said bias/reference signal module comprises a summer to accept said selected information signal and combine it with a bias signal to create a summed signal, and an impedance having a first port and a second port, said summed signal being connected to said first port, and wherein said second port outputs said bias/reference signal.

53. The system of claim 31, wherein said switch is a semiconductor device.

54. The system of claim 53, wherein said semiconductor device is a transistor.

55. The system of claim 54, wherein-said transistor is a field effect transistor.

56. The system of claim 55, wherein said field effect transistor is a complementary metal oxide semiconductor-field effect transistor.

57. The system of claim 55, wherein said field effect transistor is a gallium arsenide field effect transistor.

58. The system of claim 31, wherein said frequency band selection module comprises a frequency band selector to accept said harmonically rich signal, said frequency band selector having one or more outputs connected to one or more filter circuits, said one or more filter circuits to output said one or more desired output signals.

59. The system of claim 58, wherein said frequency band selector routes said harmonically rich signal to one of said one or more filter circuits based on the frequency band of said desired output signal.

60. The system of claim 58, wherein each of said one or more filter circuits is tuned to filter a preselected frequency range.

61. The system of claim 58, wherein said frequency band selector has one or more outputs connected to a single filter circuit.

62. The system of claim 31, further comprising an output conditioning module to accept said one or more desired output signals and to output an output signal.

63. The system of claim 62, wherein said output conditioning module comprises one or more drivers to accept said one or more desired output signals, each of said one or more drivers having a driver output, there being one or more driver outputs, each of said one or more driver outputs, being connected to a power amplifier, there being one or more power amplifiers, each of said one or more power amplifiers having an amplifier output, there being one or more amplifier outputs, wherein one of said one or more amplifier outputs is said output signal.

64. The system of claim 31, further comprising a control module, said control module providing one or more communications control signals to said information signal conditioning module.

65. The system of claim 31, further comprising a control module, said control module providing one or more communications control signals to said signal selection module.

66. The system of claim 31, further comprising a control module, said control module providing one or more communications control signals to said modulation and frequency selection module.

67. The system of claim 31, further comprising a control module, said control module providing one or more communications control signals to said frequency band selection module.

68. A system for communicating, comprising:

an information signal conditioning module to accept one or more information signals and to output one or more conditioned information signals,

a signal selection module to accept said one or more conditioned information signals and to output a selected information signal,

a modulation and frequency selection module to accept said selected information signal and to output an oscillating signal,

a frequency translation module to accept said oscillating signal and a bias/reference signal, and to output a harmonically rich signal, and

a frequency band selection module to accept said harmonically rich signal and to output one or more desired output signals,

wherein said frequency translation module comprises a square wave generator that accepts said oscillating signal and generates a square wave, a pulse shaper that accepts said square wave and generates a string of pulses, and a switch being controlled by said string of pulses and being connected to said bias/reference signal and generating said harmonically rich signal, and

wherein said switch has a first port, a second port, and a control port, wherein said string of pulses is connected to said control port, said bias/reference signal is connected to said first port, said harmonically rich signal is connected to said first port, and a ground is connected to said second port.

69. The system of claim 68, wherein said information signal conditioning module comprises one or more format modules and one or more buffer memories, said one or more format modules to accept said one or more information signals and to output formatted information signals, and said one or more buffer memories to accept said formatted information signals and to output conditioned information signals.

70. The system of claim 69, wherein the quantity of said one or more format modules is equal to the quantity of said one or more information signals.

71. The system of claim 69, wherein the quantity of said one or more buffer memories is equal to the quantity of said formatted information signals.

72. The system of claim 69, wherein the quantity of said one or more buffer memories is equal to the quantity of said one or more format modules.

73. The system of claim 68, wherein said information signal conditioning module comprises one or more format modules, said one or more format modules to accept said one or more information signals and to output conditioned information signals.

74. The system of claim 73, wherein the quantity of said one or more format modules is equal to the quantity of said one or more information signals.

75. The system of claim 68, wherein said information signal conditioning module comprises one or more buffer memories, said one or more buffer memories to accept one of said one or more information signals and to output conditioned information signals.

76. The system of claim 75, wherein the quantity of said one or more buffer memories is equal to the quantity of said one or more information signals.

77. The system of claim 68, wherein said modulation and frequency selection module comprises a modulation selector and an oscillating signal generator, said modulation selector to accept said selected information signal and to direct said selected information signal according to a modulation control signal, and said oscillating signal generator to output said oscillating signal according to a frequency control signal.

78. The system of claim 77, wherein said modulation selector accepts said selected information signal and directs said selected information signal to one of an amplitude modulation path, a phase modulation path, and a frequency modulation path, said amplitude modulation path being between said modulation selector and a bias/reference signal module, said bias/reference signal module to output said bias/reference signal, said phase modulation path and said frequency modulation path being between said modulation selector and said oscillating signal generator, said oscillating signal generator to output said oscillating signal.

81. The system of claim 77, wherein said oscillating signal generator comprises an oscillator, said oscillator to create said oscillating signal, and wherein said oscillating signal has an oscillating signal frequency that is a subharmonic of the frequency of one of said one or more desired output signals.

82. The system of claim 77, wherein said oscillating signal generator comprises a phase modulator, said phase modulator to create said oscillating signal, said oscillating signal being a phase modulated oscillating signal that is a function of said selected information signal, said phase modulated oscillating signal having an oscillating signal frequency that is a subharmonic of the frequency of one of said one or more desired output signals.

83. The system of claim 77, wherein said oscillating signal generator comprises a frequency modulator, said frequency modulator to create said oscillating signal, said oscillating signal being a frequency modulated oscillating signal that is a function of said selected information signal, said frequency modulated oscillating signal having an oscillating signal frequency that is a subharmonic of the frequency of one of said one or more desired output signals.

84. The system of claim 77, wherein said oscillating signal generator comprises one or more of an oscillator, a phase modulator, and a frequency modulator.

85. The system of claim 68, further comprising a bias/reference signal module to generate said bias/reference signal.

86. The system of claim 85, wherein said bias/reference signal module comprises a summer to accept said selected information signal and combine it with a bias signal to create said bias/reference signal.

87. The system of claim 85, wherein said bias/reference signal is a non-zero voltage that is substantially constant.

88. The system of claim 85, wherein said bias/reference signal module comprises a bias signal and an impedance, said impedance having a first port and a second port, said bias signal being connected to said first port, and wherein said second port outputs said bias/reference signal.

89. The system of claim 85, wherein said bias/reference signal module comprises a summer to accept said selected information signal and combine it with a bias signal to create a summed signal, and an impedance having a first port and a second port, said summed signal being connected to said first port, and wherein said second port outputs said bias/reference signal.

90. The system of claim 68, wherein said switch is a semiconductor device.

91. The system of claim 90, wherein said semiconductor device is a transistor.

92. The system of claim 91, wherein said transistor is a field effect transistor.

93. The system of claim 92, wherein said field effect transistor is a complementary metal oxide semiconductor field effect transistor.

94. The system of claim 92, wherein said field effect transistor is a gallium arsenide field effect transistor.

95. The system of claim 68, wherein said frequency band selection module comprises a frequency band selector to accept said harmonically rich signal, said frequency band selector having one or more outputs connected to one or more filter circuits, said one or more filter circuits to output said one or more desired output signals.

96. The system of claim 95, wherein said frequency band selector routes said harmonically rich signal to one of said one or more filter circuits based on the frequency band of said desired output signal.

97. The system of claim 95, wherein each of said one or more filter circuits is tuned to filter a preselected frequency range.

98. The system of claim 95, wherein said frequency band selector has one or more outputs connected to a single filter circuit.

99. The system of claim 68, further comprising an output conditioning module to accept said one or more desired output signals and to output an output signal.

100. The system of claim 99, wherein said output conditioning module comprises one or more drivers to accept said one or more desired output signals, each of said one or more drivers having a driver output, there being one or more driver outputs, each of said one or more driver outputs being connected to a power amplifier, there being one or more power amplifiers, each of said one or more power amplifiers having an amplifier output, there being one or more amplifier outputs, wherein one of said one or more amplifier outputs is said output signal.

101. The system of claim 68, further comprising a control module, said control module providing one or more communications control signals to said information signal conditioning module.

102. The system of claim 68, further comprising a control module, said control module providing one or more communications control signals to said signal selection module.

103. The system of claim 68, further comprising a control module, said control module providing one or more communications control signals to said modulation and frequency selection module.

104. The system of claim 68, further comprising a control module, said control module providing one or more communications control signals to said frequency band selection module.