Inserted pilot construction for an echo cancellation repeater
First Claim
1. A pilot construction device to construct a pilot signal for use in a wireless repeater, the repeater configured to add the pilot signal to a transmit signal for transmission, the device comprising:
- one or more pilot generators, each pilot generator to generate a carrier pilot signal associated with a single carrier of the transmit signal, wherein the pilot construction device is configured to construct the pilot signal by summing the carrier pilot signals generated by the one or more pilot generators, wherein each of the one or more pilot generators comprises;
a pilot symbol unit to provide a plurality of data symbols having a predetermined data structure as the carrier pilot signal;
a pilot scrambler to scramble the plurality of data symbols;
a filter to shape spectral properties of the carrier pilot signal, wherein the filter has characteristics indicative of a transmit filter of the repeater to shape spectral properties of the transmit signal, wherein the carrier pilot signal is generated to have the same spectral properties as the transmit signal;
a pilot power determination unit to set a power level of the carrier pilot signal relative to a power level of the transmit signal; and
a cyclic prefix insertion unit to insert a cyclic prefix to the carrier pilot signal.
1 Assignment
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Accused Products
Abstract
In one embodiment, a device for constructing a pilot signal for use in a wireless repeater where the pilot signal is added to a transmit signal includes one or more pilot generators. Each pilot generator generates a carrier pilot signal associated with a single carrier of the transmit signal and the carrier pilot signals generated by the one or more pilot generators are summed to generate the pilot signal. Each of the one or more pilot generators includes a pilot symbol unit providing multiple data symbols having a predetermined data structure as the carrier pilot signal, a pilot scrambler, a filter, a pilot power determination unit, and a cyclic prefix insertion unit for inserting a cyclic prefix to the carrier pilot signal. In another embodiment, the pilot symbol unit providing multiple data symbols in frequency domain as the carrier pilot signal.
39 Citations
31 Claims
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1. A pilot construction device to construct a pilot signal for use in a wireless repeater, the repeater configured to add the pilot signal to a transmit signal for transmission, the device comprising:
one or more pilot generators, each pilot generator to generate a carrier pilot signal associated with a single carrier of the transmit signal, wherein the pilot construction device is configured to construct the pilot signal by summing the carrier pilot signals generated by the one or more pilot generators, wherein each of the one or more pilot generators comprises; a pilot symbol unit to provide a plurality of data symbols having a predetermined data structure as the carrier pilot signal; a pilot scrambler to scramble the plurality of data symbols; a filter to shape spectral properties of the carrier pilot signal, wherein the filter has characteristics indicative of a transmit filter of the repeater to shape spectral properties of the transmit signal, wherein the carrier pilot signal is generated to have the same spectral properties as the transmit signal; a pilot power determination unit to set a power level of the carrier pilot signal relative to a power level of the transmit signal; and a cyclic prefix insertion unit to insert a cyclic prefix to the carrier pilot signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A pilot construction device to construct a pilot signal for use in a wireless repeater, the pilot signal being added to a transmit signal for transmission on a transmitting antenna of the repeater, the device comprising:
one or more means for generating a carrier pilot signal associated with a single carrier of the transmit signal, the carrier pilot signals generated by the one or more means being summed to generate the pilot signal, wherein each of the one or more means comprises; means for providing a plurality of data symbols having a predetermined data structure as the carrier pilot signal; means for scrambling the plurality of data symbols; means for shaping spectral properties of the carrier pilot signal, wherein the means for shaping has characteristics indicative of a transmit filter of the repeater to shape spectral properties of the transmit signal, wherein the carrier pilot signal is generated to have the same spectral properties as the transmit signal; means for setting a power level of the carrier pilot signal relative to a power level of the transmit signal; and means for inserting a cyclic prefix to the carrier pilot signal.
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9. A method for constructing a pilot signal for use in a wireless repeater, the pilot signal being added to a transmit signal for transmission, the method comprising:
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providing a plurality of data symbols having a predetermined data structure as a carrier pilot signal; scrambling the plurality of data symbols; shaping spectral properties of the carrier pilot signal using a filter, wherein the filter has characteristics indicative of a transmit filter of the repeater to shape spectral properties of the transmit signal, wherein the carrier pilot signal is generated to have the same spectral properties as the transmit signal; setting a power level of the carrier pilot signal relative to a power level of the transmit signal; and inserting a cyclic prefix to the carrier pilot signal to generate the carrier pilot signal for a single carrier, the pilot signal being formed from the carrier pilot signal of at least one carrier. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A pilot signal construction unit to construct a pilot signal for use in a wireless repeater, the pilot signal to be added to a transmit signal for transmission, the device comprising:
one or more pilot generators, each pilot generator to generate a carrier pilot signal associated with a single carrier of the transmit signal, wherein the pilot signal construction unit is configured to construct the pilot signal by summing the carrier pilot signals generated by the one or more pilot generators, wherein each of the one or more pilot generators comprises; a pilot symbol unit to provide a plurality of data symbols in the frequency domain as the carrier pilot signal, each of the plurality of data symbols being associated with a respective tone; a pilot scrambler to scramble the plurality of data symbols; a pilot power shaper to scale the scrambled data symbols to adjust the power of the data symbols across the tones; and an IFFT (Inverse Fast Fourier Transform) filter to transform the plurality of data symbols into the time domain; a power measurement unit to measure a power level of each carrier in the transmit signal; a pilot power determination unit configured to set an average power level of the carrier pilot signal and a power level of the carrier pilot signal across the tones relative to a power level of the transmit signal, and configured to control the power level of the carrier pilot signal relative to the measured power level of the corresponding carrier in the transmit signal so that the power level of the carrier pilot signal tracks the power level of the corresponding carrier in the transmit signal; and a cyclic prefix insertion unit to insert a cycle prefix to the carrier pilot signal. - View Dependent Claims (19, 20, 21, 22)
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23. A pilot construction device to construct a pilot signal for use in a wireless repeater, the pilot signal being added to a transmit signal for transmission, the device comprising:
one or more means for generating a carrier pilot signal associated with a single carrier of the transmit signal, the carrier pilot signals generated by the one or more means being summed to generate the pilot signal, wherein each of the one or more means comprises; means for providing a plurality of data symbols in the frequency domain as the carrier pilot signal, each of the plurality of data symbols being associated with a respective tone; means for scrambling the plurality of data symbols; means for scaling the scrambled data symbols to adjust the power of the data symbols across the tones; means for performing IFFT (Inverse Fast Fourier Transform) to transform the plurality of data symbols into the time domain; means for measuring a power level of each carrier in the transmit signal; means for setting an average power level of the carrier pilot signal and a power level of the carrier pilot signal across the tones relative to a power level of the transmit signal, the means for setting including means for controlling the average power level and the power level of the carrier pilot signal relative to the measured power level of the corresponding carrier in the transmit signal so that the power level of the carrier pilot signal tracks the power level of the corresponding carrier in the transmit signal; and means for inserting a cyclic prefix to the carrier pilot signal.
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24. A method for constructing a pilot signal for use in a wireless repeater, the pilot signal being added to a transmit signal for transmission, the method comprising:
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providing a plurality of data symbols in the frequency domain as a carrier pilot signal, each of the plurality of data symbols being associated with a respective tone; scrambling the plurality of data symbols; scaling the scrambled data symbols to adjust the power of the data symbols across the tones; performing IFFT (Inverse Fast Fourier Transform) to transform the plurality of data symbols into the time domain; measuring a power level of each carrier in the transmit signal; setting an average power level of the carrier pilot signal and a power level of the carrier pilot signal across the tones relative to a power level of the transmit signal; controlling the average power level and the power level of the carrier pilot signal relative to the measured power level of the corresponding carrier in the transmit signal so that the power level of the carrier pilot signal tracks the power level of the corresponding carrier in the transmit signal; and inserting a cyclic prefix to the carrier pilot signal to generate the carrier pilot signal for a single carrier, the pilot signal being formed from the carrier pilot signal of at least one carrier. - View Dependent Claims (25, 26, 27, 28, 29)
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30. A non-transitory computer-readable medium embodying instructions executable by a processor for constructing a pilot signal for use in a wireless repeater, the pilot signal being added to a transmit signal for transmission, comprising:
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at least one instruction for providing a plurality of data symbols having a predetermined data structure as a carrier pilot signal; at least one instruction for scrambling the plurality of data symbols; at least one instruction for shaping spectral properties of the carrier pilot signal using a filter, wherein the filter has characteristics indicative of a transmit filter of the repeater to shape spectral properties of the transmit signal, wherein the carrier pilot signal is generated to have the same spectral properties as the transmit signal; at least one instruction for setting a power level of the carrier pilot signal relative to a power level of the transmit signal; and at least one instruction for inserting a cyclic prefix to the carrier pilot signal to generate the carrier pilot signal for a single carrier, the pilot signal being formed from the carrier pilot signal of at least one carrier.
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31. A non-transitory computer-readable medium embodying instructions executable by a processor for constructing a pilot signal for use in a wireless repeater, the pilot signal being added to a transmit signal for transmission, comprising:
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at least one instruction for providing a plurality of data symbols in the frequency domain as the carrier pilot signal, each of the plurality of data symbols being associated with a respective tone; at least one instruction for scrambling the plurality of data symbols; at least one instruction for scaling the scrambled data symbols to adjust the power of the data symbols across the tones; at least one instruction for performing IFFT (Inverse Fast Fourier Transform) to transform the plurality of data symbols into the time domain; at least one instruction for measuring a power level of each carrier in the transmit signal; at least one instruction for setting an average power level of the carrier pilot signal and a power level of the carrier pilot signal across the tones relative to a power level of the transmit signal; at least one instruction for controlling the average power level and the power level of the carrier pilot signal relative to the measured power level of the corresponding carrier in the transmit signal so that the power level of the carrier pilot signal tracks the power level of the corresponding carrier in the transmit signal; and at least one instruction for inserting a cyclic prefix to the carrier pilot signal to generate the carrier pilot signal for a single carrier, the pilot signal being formed from the carrier pilot signal of at least one carrier.
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Specification