Method and apparatus for signal peak-to-average ratio reduction

A peak-to-average ratio and signal technology, applied in the field of signal processing, can solve the problems of undesired signal processing complexity and insufficient performance.

Active Publication Date: 2009-10-21
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology

However, these prior approaches all introduced undesired levels of signal processing complexity, or provided insufficient performance in terms of PAR reduction

Method used

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  • Method and apparatus for signal peak-to-average ratio reduction
  • Method and apparatus for signal peak-to-average ratio reduction
  • Method and apparatus for signal peak-to-average ratio reduction

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Embodiment Construction

[0033] figure 1A wireless communication device 10 is shown, such as a base station in a wireless communication network, or a mobile station for use in a wireless communication network. The illustrated wireless communication device 10 includes a signal generator 12 , a signal processing circuit (or circuits) 14 , a transmitter 16 and an associated antenna 18 . In operation, the signal generator 12 generates a complex-valued signal, for example by mapping input data to phase and amplitude points in a defined modulation constellation. Signal processing circuitry 14 then processes the complex-valued signal ("signal" for short) to reduce its amplitude variation while limiting the signal's rise in adjacent channel interference (ACI) and error vector magnitude (EVM). The peak-to-average ratio reduction performed by signal processing circuitry 14 eases the linear amplification requirements of transmitter 16 while avoiding spectral splatter and signal error.

[0034] figure 2 One ...

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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 detectedpeaks 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.

Description

technical field [0001] The present invention relates generally to signal processing, and in particular to reducing the peak-to-average ratio (PAR) of complex-valued signals, such as communication signals for transmission in wireless communication networks. Background technique [0002] The standards of many communication technologies, such as cellular, Wireless Local Area Network (WLAN), digital television broadcasting, Asymmetric Digital Subscriber Line (ADSL), etc., use signal modulation techniques based on both amplitude and phase modulation. Compared to pure phase (or frequency) modulation, amplitude modulated signals require linear amplification for accurate signal regeneration. The non-linearity introduced in amplifying such a signal brings serious problems, such as an increase of adjacent channel interference (ACI, adjacent channel interference) and an increase of error-vector-magnitude (EVM, error-vector-magnitude) of the signal. [0003] Linear amplification poses ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2624H04B2201/70706
Inventor 拉尔斯·松德斯特伦
Owner TELEFON AB LM ERICSSON (PUBL)
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