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Peak to average power ratio reduction of OFDM signals

A signal and limiting technology, applied in the field of signal processing, can solve problems such as degradation and limited reduction

Active Publication Date: 2016-07-06
TEXAS INSTR INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this approach is that it often results in major degradation to other desired system parameters such as OFDM signal quality (e.g., quantifiable by the error vector magnitude (EVM) and spectral mask of the OFDM signal)
In most communication standards and systems there are stringent requirements regarding the EVM and spectral mask characteristics of the signal, thus limiting the amount of PAPR reduction achievable by soft clipping alone

Method used

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  • Peak to average power ratio reduction of OFDM signals
  • Peak to average power ratio reduction of OFDM signals
  • Peak to average power ratio reduction of OFDM signals

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Embodiment Construction

[0015] The present disclosure relates to a system and method for reducing the peak-to-average power ratio (PAPR) of an Orthogonal Frequency Division Multiplexing (OFDM) signal. The PAPR systems and methods disclosed herein reduce the PAPR of OFDM signals and maintain the corresponding error vector magnitude (EVM) parameters and spectral mask parameters of OFDM signals within desired ranges. Communications standards often define stringent requirements for EVM and spectral masking and how to measure these values. EVM is a measure of transmitted signal quality and can be measured by a reference receiver. The spectral mask is the power of a signal outside its defined bandwidth. The systems and methods disclosed herein include initial processing in the time domain, followed by conversion to the frequency domain (eg, DFT) with further signal processing in the frequency domain to control EVM and spectral masking, reducing PAPR.

[0016] Frequency domain operations can increase the ...

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Abstract

A method includes processing an input sequence of samples of an orthogonal frequency division multiplexing signal (OFDM) to reduce aeak to average power ratio (PAPR) of the OFDM signal with given constraints of an error vector magnitude (EVM) parameter and a spectral mask parameter for the OFDM signal during a first processing iteration. The method includes performing at least one other iteration of the first processing iteration on a subsequent time domain sequence generated in the first processing iteration to reduce the PAPR of the OFDM signal below a system target PAPR threshold and below threshold limits for the EVM parameter and the spectral mask parameter.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application 62 / 098,136, entitled PEAKTOAVERAGEPOWERRATIO (PAPR) REDUCTIONOFOFDMSIGNALS (Reducing Peak-to-Average Power Ratio (PAPR) of OFDM Signals), filed December 30, 2014, the entire contents of which are incorporated by reference And incorporated into this article. technical field [0003] The present disclosure relates to signal processing, and more particularly to a system and method for reducing the peak-to-average power ratio of an Orthogonal Frequency Division Multiplexed (OFDM) signal. Background technique [0004] The peak-to-average power ratio (PAPR) of a signal refers to the ratio of peak instantaneous power to average power, as measured over a period of time (or time window). Alternatively, the peak-to-average ratio also refers to the ratio of the peak amplitude of a signal envelope measured over a period of time to the average amplitude of ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2614H04L27/2623H04B17/13H04L27/26265H04L27/3411
Inventor L·布雷彻S·埃雷兹
Owner TEXAS INSTR INC
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