Self-adaptive amplitude limiting method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) system

A peak-to-average ratio and self-adaptive technology, applied in the field of adaptive clipping rate constraint clipping that reduces the peak-to-average ratio of OFDM systems, can solve the problem that OFDM symbols cannot achieve the best effect, and achieve the effect of reducing PAPR and improving PAPR

Inactive Publication Date: 2013-03-06
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, a fixed clipping rate may not be optimal for individual OFDM symbols

Method used

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  • Self-adaptive amplitude limiting method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) system
  • Self-adaptive amplitude limiting method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) system
  • Self-adaptive amplitude limiting method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) system

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Embodiment Construction

[0034] The specific implementation method of reducing the peak-to-average ratio of the OFDM system under a specific OFDM configuration of this patent is given below:

[0035] Step 1 inputs the original signal, and the OFDM frequency domain signal can be expressed as Where N is the number of subcarriers of the OFDM system, where i=1,2,3,...,∞, the frequency domain signal is transformed into a time domain signal by IFFT And the signal is L times oversampled, and the oversampled signal can be expressed as:

[0036] x n i = 1 LN Σ k = 0 LN - 1 X ^ k i e j 2 πkn ...

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Abstract

The invention discloses a self-adaptive amplitude limiting method for reducing peak-to-average power ratio of an OFDM (orthogonal frequency division multiplexing) system. By researching the relationship of time domain signal variation and frequency domain signal variation in the amplitude limiting algorithm, and on the basis of probability distribution of time domain signal amplitude, the invention proposes a method of setting the amplitude limiting rate adopted in the amplitude limiting process according to the energy of statistical difference value signals exceeding a set threshold; and when the method is applied to the constraint amplitude limiting algorithm, the self-adaptive amplitude limiting of an OFDM symbol is realized, and the peak-to-average power ratio (PAPR) of the OFDM system can be effectively lowered. As indicated in theoretical analysis and simulation, and compared with the constraint amplitude limiting algorithm with fixed amplitude limiting rate, the self-adaptive amplitude limiting method has better PAPR performance.

Description

technical field [0001] The present invention relates to the technical field of improving OFDM signals in an Orthogonal Frequency Division Multiplexing (OFDM) mobile communication system, in particular to an adaptive clipping rate constraint that reduces the peak-to-average ratio of an OFDM system. method. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) has the characteristics of anti-multipath fading, high spectrum utilization and large system capacity, so it is used as a standard by many high-speed transmission systems (such as 3GPPP LTE, WiMAX, WLAN and DVB, etc.). However, OFDM signal has a shortcoming of high peak-to-average power ratio, which seriously affects the performance of OFDM system. In order to reduce the peak-to-average power ratio, many methods have been proposed, including clipping technology, probability technology, and coding technology. [0003] The clipping method is adopted by many OFDM systems because it is simple and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 罗仁泽张成森牛娜
Owner SOUTHWEST PETROLEUM UNIV
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