Einzeltreffer — DigiBib

Signal-to-noise ratios (SNRs) and/or amplifier performance can be improved in crest factor reduction (CFR) applications by steering clipping noise in a different direction than the data signal achieving upon reception. Indeed, using clipping noise signals that have a different amplitude-phase relationship than the input/baseline signal causes the clipping noise signal and data signal to exhibit different antenna patterns, effectively steering the clipping noise in a different direction than the data signal. For instance, clipping noise can be steered away from potential receivers to improve received signal quality. In addition, higher magnitude clipping noise can be used to achieve improved power amplifier performance without increasing received SNR.

Titel:	METHODS AND SYSTEMS FOR BEAM STEERING CREST FACTOR REDUCTION (CFR) CLIP NOISE
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2014
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20140270016 Publication Date: September 18, 2014 Appl. No: 13/797408 Application Filed: March 12, 2013 Claim: 1. A method for crest factor reduction (CFR), the method comprising: receiving an input signal having an initial magnitude exceeding a CFR threshold; and introducing a clipping noise signal into the input signal to produce an output signal having a resulting magnitude that is less than or equal to the threshold, wherein the clipping noise signal and the input signal have different amplitude-phase relationships such that a resulting phase of the output signal differs from an initial phase of the input signal. Claim: 2. The method of claim 1 further comprising: determining a desired steering angle in accordance with a distribution of users in a cell to increase a signal to noise ratio (SNR) at a location of one or more of the users; and selecting amplitude and phase parameters of the clipping noise signal in accordance with desired steering angle. Claim: 3. The method of claim 2, wherein selecting amplitude and phase parameters of the clipping noise signal in accordance with desired steering angle comprises: selecting the phase component of the clipping noise signal such that the clipping noise signal and the input signal do not have an opposite phase relationship; and selecting an amplitude component of the clipping noise signal in accordance with the phase component of the clipping noise signal such that a magnitude of the clipping noise signal was sufficient for performing CFR on the input signal. Claim: 4. The method of claim 1, wherein the clipping noise signal and the input signal have an inapposite phase relationship such that a phase difference between the clipping noise signal and the input signal is not equal to Π (180 degrees). Claim: 5. The method of claim 4, wherein a phase difference between the clipping noise signal and the input signal has an absolute value that is less than Π (180 degrees) but greater than H/2 (90 degrees). Claim: 6. The method of claim 4, wherein a phase difference between the clipping noise signal and the input signal has an absolute value that is greater than Π (180 degrees) but less than 3H/2 (170 degrees). Claim: 7. The method of claim 1, wherein the clipping noise signal has a different antenna pattern than the clipped signal. Claim: 8. The method of claim 1 further comprising transmitting the clipped signal over a plurality of wireless interfaces. Claim: 9. An apparatus for performing crest factor reduction (CFR), the apparatus comprising: a processor; and a computer readable storage medium storing programming for execution by the processor, the programming including instructions to: receive an input signal having an initial magnitude that exceeds a CFR threshold; and introduce a clipping noise signal into the input signal to produce an output signal having a resulting magnitude that is less than or equal to the threshold, wherein the clipping noise signal and the input signal have different amplitude-phase relationships such that a resulting phase of the output signal differs from an initial phase of the input signal. Claim: 10. The apparatus of claim 9, wherein the programming further comprises instructions to: determine a desired steering angle in accordance with a distribution of users in a cell to increase a signal to noise ratio (SNR) at a location of one or more of the users; and select amplitude and phase parameters of the clipping noise signal in accordance with desired steering angle. Claim: 11. The apparatus of claim 10, wherein the instructions to select amplitude and phase parameters of the clipping noise signal in accordance with the desired steering angle include instructions to: select the phase component of the clipping noise signal such that the clipping noise signal and the input signal do not have an opposite phase relationship. Claim: 12. The apparatus of claim 9, wherein the clipping noise signal and the input signal have an inapposite phase relationship such that a phase difference between the clipping noise signal and the input signal is not equal to Π (180 degrees). Claim: 13. The apparatus of claim 12, wherein a phase difference between the clipping noise signal and the input signal has an absolute value that is less than Π (180 degrees) but greater than H/2 (90 degrees). Claim: 14. The apparatus of claim 12, wherein a phase difference between the clipping noise signal and the input signal has an absolute value that is greater than Π (180 degrees) but less than 3H/2 (170 degrees). Claim: 15. The apparatus of claim 9, wherein the clipping noise signal has a different antenna pattern than the clipped signal. Claim: 16. The apparatus of claim 9, further comprising transmitting the clipped signal over a plurality of wireless interfaces. Claim: 17. An apparatus comprising: an input interface for receiving an input signal; and a crest factor reduction (CFR) module coupled to the input interface, the CFR module configured to: determine that the input signal has an initial magnitude that exceeds a CFR threshold; and introduce a clipping noise signal into the input signal to obtain an output signal having a resulting magnitude that is less than or equal to the threshold, wherein the clipping noise signal and the input signal have different amplitude-phase relationships such that a resulting phase of the output signal differs from an initial phase of the input signal. Claim: 18. The apparatus of claim 17, wherein the clipping noise signal and the input signal have an inapposite phase relationship such that a phase difference between the clipping noise signal and the input signal is not equal to Π (180 degrees). Claim: 19. The apparatus of claim 17, further comprising: an antenna array; and an amplifier module positioned in-between the CFR module and the antenna array, the amplifier module configured to amplify the output signal to produce an amplified output signal; and forward the amplified output signal to the antenna array for transmission over a network. Claim: 20. The apparatus of claim 19, wherein the CFR module and the amplifier module are constructed using field programmable gate arrays. Current U.S. Class: 375/346 Current International Class: 04

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METHODS AND SYSTEMS FOR BEAM STEERING CREST FACTOR REDUCTION (CFR) CLIP NOISE