Invention Grant
- Patent Title: Method and apparatus for signal peak-to-average ratio reduction
- Patent Title (中): 信号峰均比降低的方法和装置
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Application No.: US11614596Application Date: 2006-12-21
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Publication No.: US07995975B2Publication Date: 2011-08-09
- Inventor: Lars Sundström
- Applicant: Lars Sundström
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee Address: SE Stockholm
- Agency: Coats & Bennett, P.L.L.C.
- Main IPC: H01Q11/12
- IPC: H01Q11/12

Abstract:
A method and apparatus taught herein reduce the peak-to-average ratio (PAR) of a complex-valued signal based on detecting peaks in the signal that are above a peak threshold, characterizing the detected peaks in Cartesian coordinates, generating cancellation pulses in Cartesian coordinates based on the detected peak characterizations. PAR reduction processing continues with canceling the detected peaks by combining the cancellation pulses with a correspondingly delayed version of the signal. Advantageously, peak detection may be performed in polar form using a computationally efficient peak detection algorithm that avoids calculation of the I and Q peak waveforms unless a signal peak beyond a defined threshold is present. In one or more embodiments, the generation and use of asymmetric and/or shaped cancellation pulses offers further performance advantages.
Public/Granted literature
- US20080150625A1 Method and Apparatus for Signal Peak-to-Average Ratio Reduction Public/Granted day:2008-06-26
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