System and method for impulse radio power control
First Claim
1. A method for power control in an ultra wideband (UWB) impulse radio system, comprising the steps of:
- transmitting an impulse radio signal from a first transceiver;
receiving said impulse radio signal at a second transceiver;
determining at least one performance measurement of said received impulse radio signal;
calculating a power control update according to said at least one performance measurement of said received impulse radio signal; and
controlling the output power of at least one of said first transceiver and said second transceiver according to said power control update.
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Abstract
A system and method for impulse radio power control wherein a first transceiver transmits an impulse radio signal to a second transceiver. A power control update is calculated according to a performance measurement of the signal received at the second transceiver. The transmitter power of either transceiver, depending on the particular embodiment, is adjusted according to the power control update. Various performance measurements are employed according to the current invention to calculate a power control update, including bit error rate, signal-to-noise ratio, and received signal strength, used alone or in combination. Interference is thereby reduced, which is particularly important where multiple impulse radios are operating in close proximity and their transmission interfere with one another. Reducing the transmitter power of each radio to a level that produces satisfactory reception increases the total number of radios that can operate in an area without saturation. Reducing transmitter power also increases transceiver efficiency.
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Citations
80 Claims
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1. A method for power control in an ultra wideband (UWB) impulse radio system, comprising the steps of:
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transmitting an impulse radio signal from a first transceiver;
receiving said impulse radio signal at a second transceiver;
determining at least one performance measurement of said received impulse radio signal;
calculating a power control update according to said at least one performance measurement of said received impulse radio signal; and
controlling the output power of at least one of said first transceiver and said second transceiver according to said power control update. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
further comprising the step of transmitting a further impulse radio signal from said second transceiver, wherein said step of transmitting said further impulse radio signal comprises transmitting a pulse train including a quantity Ntrain2 of pulses for each bit of information, and wherein said step of controlling said output power of said second transceiver comprises controlling said quantity Ntrain2 of pulses according to said power control update. -
10. The method of claim 9, further comprising the step of providing said second transceiver with information related to said quantity Ntrain of pulses by including said information in a header of said impulse radio signal.
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11. The method of claim 9, further comprising the step of providing said second transceiver with information related to said quantity Ntrain of pulses by including said information in control signals transmitted by said first transceiver.
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12. The method of claim 9, wherein said step of controlling said quantity Ntrain2 comprises calculating said quantity Ntrain2 of pulses according to:
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13. The method of claim 9, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses,
wherein said quantity Ntrain2 of pulses comprises a quantity Nperiod2 of periods, and wherein each period comprises a quantity Npulses-per-period2 of pulses, and wherein said step of controlling said quantity Ntrain2 of pulses comprises controlling said quantity Npulses-per-period2 of pulses. -
14. The method of claim 9, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses,
wherein said quantity Ntrain2 of pulses comprises a quantity Nperiod2 of periods, and wherein each period comprises a quantity Npulses-per-period2 of pulses, and wherein said step of controlling said quantity Ntrain2 of pulses comprises controlling said quantity Nperiod2 of periods. -
15. The method of claim 1, wherein said step of calculating is performed at said second transceiver,
further comprising the step of transmitting said power control update from said second transceiver to said first transceiver between said calculating step and said controlling step, and wherein said controlling step comprises controlling said output power of said first transceiver according to said power control update. -
16. The method of claim 1, further comprising the step of transmitting said at least one performance measurement from said second transceiver to said first transceiver between said determining step and said calculating step,
wherein said calculating step is performed at said first transceiver, and wherein said controlling step comprises controlling said output power of said first transceiver according to said power control update. -
17. The method of claim 1, wherein said controlling step comprises controlling said output power of said first transceiver according to said power control update.
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18. The method of claim 17, further comprising the step of transmitting a further impulse radio signal from said first transceiver, and wherein said step of controlling said output power of said first transceiver comprises controlling a number of pulses of said further impulse radio signal according to said power control update.
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19. The method of claim 17, further comprising the step of transmitting a further impulse radio signal from said first transceiver, and wherein said step of controlling said output power of said first transceiver comprises controlling the pulse peak power of said further impulse radio signal according to said power control update.
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20. The method of claim 17, further comprising the step of transmitting a further impulse radio signal from said first transceiver, and wherein said step of controlling said output power of said first transceiver comprises controlling the pulse height of said further impulse radio signal according to said power control update.
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21. The method of claim 17, wherein said step of transmitting said impulse radio signal comprises transmitting a pulse train including a quantity Ntrain of pulses for each bit of information,
further comprising the step of transmitting a further impulse radio signal from said first transceiver, wherein said step of transmitting said further impulse radio signal comprises transmitting a pulse train including a quantity Ntrain2 of pulses for each bit of information, and wherein said step of controlling said output power of said first transceiver comprises controlling said quantity Ntrain2 of pulses according to said power control update. -
22. The method of claim 21, further comprising the step of providing said second transceiver with information related to said quantity Ntrain of pulses by including said information in a header of said impulse radio signal.
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23. The method of claim 21, further comprising the step of providing said second transceiver with information related to said quantity Ntrain of pulses by including said information in control signals transmitted by said first transceiver.
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24. The method of claim 21, wherein said step of controlling said quantity Ntrain2 comprises calculating said quantity Ntrain2 according to:
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25. The method of claim 21, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses,
wherein said quantity Ntrain2 of pulses comprises a quantity Nperiod2 of periods, and wherein each period comprises a quantity Npulses-per-period2 of pulses, and wherein said step of controlling said quantity Ntrain2 of pulses comprises controlling said quantity Npulses-per-period2 of pulses. -
26. The method of claim 21, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses,
wherein said quantity Ntrain2 of pulses comprises a quantity Nperiod2 of periods, and wherein each period comprises a quantity Npulses-per-period2 of pulses, and wherein said step of controlling said quantity Ntrain2 of pulses comprises controlling said quantity Nperoid2 of periods. -
27. The method of claim 1, wherein said step of determining comprises determining the signal strength of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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28. The method of claim 1, wherein said step of determining comprises determining the signal-to-noise ratio of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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29. The method of claim 1, wherein said step of determining comprises determining the bit error rate of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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30. The method of claim 1, wherein said step of determining comprises determining the bit error rate and the signal strength of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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31. The method of claim 1, wherein said step of determining comprises determining the bit error rate and the signal-to-noise ratio of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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32. The method of claim 1, wherein said step of determining comprises determining the signal-to-noise ratio and the signal strength of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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33. The method of claim 1, wherein said step of determining comprises determining the bit error rate of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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34. The method of claim 1, wherein said step of determining comprises determining the bit error rate and the signal strength of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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35. The method of claim 1, wherein said step of determining comprises determining the bit error rate and the signal-to-noise ratio of said received impulse radio signal, and wherein said step of calculating comprises calculating said power control update according to:
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36. A method for power control in a UWB impulse radio system, comprising the steps of:
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transmitting an impulse radio signal from a first transceiver;
receiving said impulse radio signal at a second transceiver;
determining at least one signal performance measurement based on said received impulse radio signal;
determining a power control update based on said at least one signal performance measurement;
determining a power control command based on at least said power control update; and
controlling the output power of at least one of said first transceiver and said second transceiver according to said power control command. - View Dependent Claims (37, 38, 39)
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38. The method of claim 36, wherein said step of controlling the output power comprises controlling the output power according to:
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39. The method of claim 36, wherein said step of controlling the output power comprises controlling the output power according to:
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40. A UWB impulse radio transceiver, wherein said transceiver communicates with a second UWB impulse radio transceiver, said impulse radio transceiver comprising:
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an impulse radio transmitter;
an impulse radio receiver, wherein said receiver receives an impulse radio signal from the second impulse transceiver;
a power adjuster that calculates a power control update according to at least one performance measurement of said received impulse radio signal; and
a power controller that controls the output power of said impulse radio transmitter according to said power control update. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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49. The transceiver of claim 47, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses, and wherein said power controller controls the output power by controlling said quantity Npulses-per-period of pulses according to said power control update.
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50. The transceiver of claim 47, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses, and wherein said power controller controls the output power by controlling said quantity Nperiod of pulses according to said power control update.
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51. The transceiver of claim 40, wherein said at least one performance measurement comprises the signal strength of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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52. The transceiver of claim 51, further comprising a signal evaluator to determine the signal strength of said received impulse radio signal.
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53. The transceiver of claim 40, wherein said at least one performance measurement comprises the signal-to-noise ratio of said received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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54. The transceiver of claim 40, wherein said at least one performance measurement comprises the bit error rate of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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55. The transceiver of claim 40, wherein said at least one performance measurement comprises the bit error rate and the signal strength of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
Pref=K2(BERS1−
BERref)
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56. The transceiver of claim 40, wherein said at least one performance measurement comprises the bit error rate and the signal-to-noise ratio of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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57. The transceiver of claim 40, wherein said at least one performance measurement comprises the signal-to-noise ratio and the signal strength of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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58. The transceiver of claim 40, wherein said at least one performance measurement comprises the bit error rate of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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59. The transceiver of claim 40, wherein said at least one performance measurement comprises the bit error rate and the signal strength of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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60. The transceiver of claim 40, wherein said at least one performance measurement comprises the bit error rate and the signal-to-noise ratio of the received impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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61. A UWB impulse radio transceiver, wherein said transceiver communicates with a second UWB impulse radio transceiver, said impulse radio transceiver comprising:
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an impulse radio transmitter, wherein said transmitter transmits an impulse radio signal to the second impulse transceiver;
an impulse radio receiver, wherein said receiver receives information related to said transmitted impulse radio signal from the second transceiver; and
a power controller that controls the output power of said impulse radio transmitter according to said information related to said transmitted impulse radio signal.- View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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70. The transceiver of claim 68, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses, and wherein said power controller controls the output power by controlling said quantity Npulses-per-period of pulses according to said power control update.
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71. The transceiver of claim 68, wherein said quantity Ntrain of pulses comprises a quantity Nperiod of periods, and wherein each period comprises a quantity Npulses-per-period of pulses, and wherein said power controller controls the output power by controlling said quantity Nperiod of pulses according to said power control update.
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72. The transceiver of claim 63, wherein said at least one performance measurement comprises the signal strength of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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73. The transceiver of claim 63, wherein said at least one performance measurement comprises the signal-to-noise ratio of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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74. The transceiver of claim 63, wherein said at least one performance measurement comprises the bit error rate of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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dP=K(BERs1−
BERref)where dP is said power control update, K is a gain constant, BERS1 is the bit error rate of said transmitted impulse radio signal, and BERref is a bit error rate reference.
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75. The transceiver of claim 63, wherein said at least one performance measurement comprises the bit error rate and the signal strength of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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76. The transceiver of claim 63, wherein said at least one performance measurement comprises the bit error rate and the signal-to-noise ration of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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77. The transceiver of claim 63, wherein said at least one performance measurement comprises the signal-to-noise ratio and the signal strength of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
Pref=K2(SNRref−
SNRS1)
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78. The transceiver of claim 63, wherein said at least one performance measurement comprises the bit error rate of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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79. The transceiver of claim 63, wherein said at least one performance measurement comprises the bit error rate and the signal strength of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
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80. The transceiver of claim 63, wherein said at least one performance measurement comprises the bit error rate and the signal-to-noise ratio of said transmitted impulse radio signal, and wherein said power adjuster calculates said power control update according to:
SNRref=K2(log(BERs1)−
log(BERref))
Specification