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Selective mapping scrambling method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing system

A technology of peak-to-average power ratio and orthogonal frequency division, which is applied in the field of selective mapping scrambling codes, can solve problems such as high computational complexity and transmission of auxiliary information, and achieve improved overall performance, excellent peak-to-average power ratio performance, and computational complexity Reduced effect

Inactive Publication Date: 2010-09-29
SHANDONG UNIV
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Problems solved by technology

[0016] The present invention aims at the problems of large computational complexity and the need to transmit auxiliary information in the existing selective mapping method for reducing the peak-to-average power ratio of OFDM systems, and provides a method with low computational complexity, good peak-to-average power ratio performance and no auxiliary information Selective Mapping Scrambling Method for Reducing Peak-to-Average Power Ratio of Orthogonal Frequency Division Multiplexing System for Transmission

Method used

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  • Selective mapping scrambling method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing system
  • Selective mapping scrambling method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing system
  • Selective mapping scrambling method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing system

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Embodiment Construction

[0042] figure 1 The principle block diagram of the transmitter is given, and the specific implementation steps of the transmitter are as follows:

[0043](1) Use 0 and 1 as elements to generate more than two scrambling code sequences equal to the number of OFDM system subcarriers with equal probability, and then perform each element in each scrambling code sequence one by one according to the encoding mapping method adopted Copy to obtain a scrambling sequence of the same length as the input binary data;

[0044] (2) Execute the XOR operation on the generated scrambling code sequence and the binary sequence to be transmitted one by one, complete the scrambling process, and obtain the candidate sequence of the scrambled code; replace the complex multiplication of the traditional selective mapping method with the XOR logic operation, The scrambling code is used instead of the phase weighting to complete the weighting processing of the input data, so as to improve the operation ...

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Abstract

The invention discloses a selective mapping scrambling method for reducing peak-to-average power ratio of an orthogonal frequency division multiplexing system, which comprises the steps: at a sending end, scrambling input binary sequences respectively by a plurality of scrambling sequences to generate a plurality of scrambled candidate sequences; then code-mapping these candidate sequences and simultaneously embedding auxiliary information into each candidate sequence in a manner of code-mapping, implementing inverse fast Fourier transform on these sequences respectively, and selecting the candidate sequence with the smallest peak-to-average power ratio from these candidate sequences for transmission; at a receiving end, implementing fast Fourier transform on the received sequences at first and then detecting the auxiliary information, and sequentially completing code de-mapping and descrambling by using the detected auxiliary information in order to obtain data sent by the sending end. The method not only can greatly lessen computer complexity, but can also obtain optimal peak-to-average power ratio performance without the need of transmitting the auxiliary information, thereby enhancing the overall performance of the OFDM system.

Description

technical field [0001] The invention relates to a selective mapping scrambling code method for reducing the peak-to-average power ratio of an orthogonal frequency division multiplexing system, which belongs to the technical field of digital communication. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely applied to many fields of wireless communication, such as wireless local area network, digital audio broadcasting, digital video broadcasting and asymmetric digital subscriber line standards and so on. OFDM technology can effectively resist multipath fading, and realize high-speed data transmission in a wireless environment with high spectral efficiency. However, an excessively high peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR) is one of the main defects of the OFDM technology. This requires that the power amplifier has good linear characteristics, otherwise it will cause in-band distortion and out-o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/34
Inventor 刘琚王灵垠
Owner SHANDONG UNIV
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