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A joint method for reducing OFDM signal peak flat ratio

A signal peak and fusion method technology is applied in the joint field of reducing the peak-to-average ratio of OFDM signals, which can solve the problem of high computational complexity and achieve the effect of suppressing the peak-to-average ratio.

Inactive Publication Date: 2007-12-12
罗仁泽
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Problems solved by technology

[0008] For the companding algorithm provided by "Amplitude Companding Suppression Method for Peak-to-Average Ratio of Orthogonal Frequency Division Multiplexing Communication System" (patent application number: 02136339.0) proposed by Hu Liangliang and Zhou Yuefeng and others at Shanghai Jiaotong University, its computational complexity is relatively high
[0009] As mentioned above, in order to solve the problem caused by high PAPR in OFDM communication system, various methods for reducing PAPR are given, but each still has certain problems

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  • A joint method for reducing OFDM signal peak flat ratio
  • A joint method for reducing OFDM signal peak flat ratio

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Embodiment Construction

[0028] The technical solution of the present invention will be further described through specific implementation below.

[0029] The present invention is applied to OFDM systems. The system adopts QPSK modulation, the number of sub-carriers is 128, SNR=10dB, AWGN channel. The specific steps are:

[0030] 1. The sender copies the input sequence to multiple data blocks;

[0031] 2. Obtain a phase-rotated data block by multiplying the multiple data blocks by M different phase sequences generated by a specific method;

[0032] 3. Inserting auxiliary information for marking the phase-rotated data block into a predetermined position of the phase-rotated data block;

[0033] 4. Performing a fast Fourier transform on the phase-rotated data block containing auxiliary information;

[0034] 5. Select the data block with the smallest PAPR from the data blocks that have undergone fast Fourier transform;

[0035] 6. The selected data blocks are converted to parallel and serial, and the...

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Abstract

The invention provides a uniting method of decreasing OFDM signal peak ratio, the method maps base band signal modulated by OFDM selectively, then extent is compressed, signal is expanded on receiving end, and edge information is used to release mapping to recover signal. The invention can make ratio of signal peak power and average power decreased greatly, so peak ratio of signal is restrained, and transmission performance of signal is equal to press-expending method. The invention is easy to realize, and can be used in various communication systems with OFDM to modulate.

Description

Technical field: [0001] The invention relates to a combined method for reducing the peak-to-average ratio of OFDM signals, which belongs to the field of digital communication using electromagnetic wave technology, and in particular to digital TV, single-carrier OFDM communication systems, multi-carrier OFDM communication systems, wireless local area networks (WLAN), etc. using OFDM modulation digital communication system. Background technique: [0002] Orthogonal Frequency Division Multiplexing Modulation (OFDM) is widely used because of its high channel utilization and good anti-fading ability. However, in an OFDM communication system, as the number of carriers increases, the value of the peak-to-average ratio (PAPR) of the superimposed signal becomes larger. Therefore, the dynamic range of the modulated signal is large, which requires the power amplifier in the system to have a high linear amplification range to avoid spectral diffusion and nonlinear distortion of the tra...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 罗仁泽
Owner 罗仁泽
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