Crest factor reduction cancellation pulse having a reduced length

Patent metadata

Field	Value
Publication number	US-2024007337-A1
Application number	US-202217854155-A
Country	US
Kind code	A1
Filing date	Jun 30, 2022
Priority date	Jun 30, 2022
Publication date	Jan 4, 2024
Grant date	—

Abstract

Techniques are disclosed for the use of Crest Factor Reduction (CFR) technique that utilizes a cancellation pulse signal having a reduced length. The CFR technique may be applied to a signal to be transmitted, which may comprise a composite signal having one or more carrier signals. Each carrier signal of the composite signal may be filtered via a respective channel filter and then recombined to form the signal to be transmitted, on which the CFR operations are then applied. The length of the cancellation pulse signal is less than the number of taps of the channel filter with the largest number of taps. This reduction in cancellation pulse signal length significantly reduces the processing power required to perform the CFR operations while maintaining regulatory emissions compliance.

First claim

What is claimed is:

1 . A non-transitory computer-readable medium having instructions stored thereon that, when executed by processing circuitry, cause the processing circuitry to perform crest factor reduction (CFR) by:
generating a scaled cancellation pulse signal comprising a first set of data samples; and performing CFR by subtracting the first set of data samples from a second set of data samples associated with a signal to be transmitted, to thereby generate a transmit signal, wherein the signal to be transmitted comprises a carrier signal that is filtered via a channel filter having a frequency response based upon a predetermined bandwidth of the carrier signal, and wherein the number of the first set of data samples is less than a number of taps of the channel filter.

2 . The non-transitory computer-readable medium of claim 1 , wherein the instructions are executed via a programmable processing array to perform the CFR.

3 . The non-transitory computer-readable medium of claim 1 , wherein the scaled cancellation pulse signal has a spectral response that is contained within a bandwidth of the carrier signal.

4 . The non-transitory computer-readable medium of claim 1 , wherein:
the signal to be transmitted is a composite signal comprising a plurality of carrier signals that include the carrier signal, each one of the plurality of carrier signals is filtered via a respective one of a plurality of channel filters, each having a respective number of taps, and the number of the first set of data samples is less than the number of taps of a respective one of the plurality of channel filters having the largest number of taps.

5 . The non-transitory computer-readable medium of claim 1 , wherein the transmit signal complies with boundaries defined by a predetermined spectral mask.

6 . The non-transitory computer-readable medium of claim 1 , wherein (i) a spectral response of the signal to be transmitted, and (ii) a spectral response of the cancellation pulse signal, are different from one another.

7 . The non-transitory computer-readable medium of claim 1 , wherein the spectral response of the signal to be transmitted is identical to the spectral response of the scaled cancellation pulse signal except at spectral edges of the signal to be transmitted and the cancellation pulse signal.

8 . A system on a chip (SoC), comprising:
a channel filter configured to perform channel filtering on a carrier signal of a signal to be transmitted in accordance with a number of filter taps, the channel filter having a frequency response that is based upon a predetermined bandwidth of the carrier signal; and processing circuitry to perform crest factor reduction (CFR) by:
generating a scaled cancellation pulse signal comprising a first set of data samples; and
subtracting the first set of data samples from a second set of data samples associated with the signal to be transmitted, to thereby generate a transmit signal,
wherein the number of the first set of data samples is less than the number of filter taps.

9 . The SoC of claim 8 , wherein the processing circuitry comprises part of an application specific integrated circuit (ASIC).

10 . The SoC of claim 8 , wherein the processing circuitry comprises part of a field programmable gate array (FPGA).

11 . The SoC of claim 8 , wherein the scaled cancellation pulse signal has a spectral response that is contained within a bandwidth of the carrier signal.

12 . The SoC of claim 8 , wherein:
the signal to be transmitted is a composite signal comprising a plurality of carrier signals that include the carrier signal, each one of the plurality of carrier signals is filtered via a respective one of a plurality of channel filters, each having a respective number of taps, and the number of the first set of data samples is less than the number of taps of a respective one of the plurality of channel filters having the largest number of taps.

13 . The SoC of claim 8 , wherein the transmit signal complies with boundaries defined by a predetermined spectral mask.

14 . The SoC of claim 8 , wherein (i) a spectral response of the signal to be transmitted, and (ii) a spectral response of the cancellation pulse signal, are different from one another.

15 . The SoC of claim 8 , wherein the spectral response of the signal to be transmitted is identical to the spectral response of the scaled cancellation pulse signal except at spectral edges of the signal to be transmitted and the cancellation pulse signal.

16 . A wireless device, comprising:
channel processing circuitry comprising a channel filter configured to perform channel filtering on a carrier signal of a signal to be transmitted in accordance with a number of filter taps, the channel filter having a frequency response that is based upon a predetermined bandwidth of the carrier signal; and transmitter circuitry configured to perform crest factor reduction (CFR) by:
generating a scaled cancellation pulse signal comprising a first set of data samples; and
subtracting the first set of data samples from a second set of data samples associated with the signal to be transmitted, to thereby generate a transmit signal,
wherein the number of the first set of data samples is less than the number of filter taps.

17 . The wireless device of claim 16 , wherein the scaled cancellation pulse signal has a spectral response that is contained within a bandwidth of the carrier signal.

18 . The wireless device of claim 16 , wherein:
the signal to be transmitted is a composite signal comprising a plurality of carrier signals that include the carrier signal, each one of the plurality of carrier signals is filtered via a respective one of a plurality of channel filters, each having a respective number of taps, and the number of the first set of data samples is less than the number of taps of a respective one of the plurality of channel filters having the largest number of taps.

19 . The wireless device of claim 16 , wherein the transmit signal complies with boundaries defined by a predetermined spectral mask.

20 . The wireless device of claim 16 , wherein (i) a spectral response of the signal to be transmitted, and (ii) a spectral response of the cancellation pulse signal, are different from one another.

21 . The SoC of claim 8 , wherein the spectral response of the signal to be transmitted is identical to the spectral response of the scaled cancellation pulse signal except at spectral edges of the signal to be transmitted and the cancellation pulse signal.

Assignees

• Intel Corp

Inventors

• Motipalli Sunitha
• Azadet Kameran
• Molina Albert
• Othmer Joseph
• Rajamani Kannan

Classifications

• H04L27/2618 Primary

  Reduction thereof using auxiliary subcarriers · CPC title

• H04L27/262

  Reduction thereof by selection of pilot symbols · CPC title

• H04L27/2615

  Reduction thereof using coding · CPC title

• H04B1/0475

  with means for limiting noise, interference or distortion (H04B1/0483 takes precedence) · CPC title

• H04L27/2624 Primary

  by soft clipping · CPC title