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Iterative clipping and filtering method for optimal clipping ratio of OFDM (Orthogonal Frequency Division Multiplexing) system

A technology of iterative clipping and clipping rate, which is applied in the field of OFDM signal improvement, can solve problems such as inappropriateness and reduced algorithm performance, and achieve the effect of reducing PAPR

Inactive Publication Date: 2015-01-21
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

This fixed CR is suitable for most OFDM symbols, but there are also a small number of symbols that are not suitable, thus reducing the performance of the algorithm

Method used

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  • Iterative clipping and filtering method for optimal clipping ratio of OFDM (Orthogonal Frequency Division Multiplexing) system
  • Iterative clipping and filtering method for optimal clipping ratio of OFDM (Orthogonal Frequency Division Multiplexing) system
  • Iterative clipping and filtering method for optimal clipping ratio of OFDM (Orthogonal Frequency Division Multiplexing) system

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Embodiment Construction

[0031] Provide the specific implementation method of this patent below:

[0032] 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, this i=1,2,3,...,∞, the frequency domain signal is transformed into a time domain signal by IFFT x i = [ x 0 i , x 1 i , x 2 i , . . . , x N - 1 i ] ;

[0033] Step 2 and oversampling the signal by L times, the oversampled signal can be expressed as: x n i = 1 LN ...

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Abstract

The invention discloses an iterative clipping and filtering method for the optimal clipping ratio of an OFDM (Orthogonal Frequency Division Multiplexing) system. According to the iterative clipping and filtering method disclosed by the invention, a method for calculating the clipping ratio of an OFDM sign according to the change condition of the clipped frequency domain information of each OFDM sign is provided and is used for an iterative clipping and filtering algorithm. The clipping ratio (CR) of the traditional iterative clipping and filtering method is fixed, so that the ideal effect of individual OFDM signs cannot be obtained. The iterative clipping and filtering (ICF) method is a simple and effective method for reducing the peak-to-average power ratio (PAPR) of the OFDM system. The theory and simulation show that the improved algorithm has the characteristic that the PAPR can be reduced more effectively compared with a traditional method.

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 iterative limiting filtering method for an optimal limiting rate of an OFDM system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) has the advantages of anti-multipath fading, high spectrum utilization and large system capacity, so it is adopted as a standard for many high-speed transmission systems. However, OFDM signal has the disadvantage 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 of the system, many methods have been proposed, including clipping techniques, probability techniques, and coding techniques. [0003] The iterative clipping filter method has been adopted by many OFDM systems (such as 3GPPP LTE, WiMAX, WLAN and DVB) because o...

Claims

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Application Information

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