Method for lowering PAR of OFDM system based on virtual carrier preservation algorithm

A technology of peak-to-average ratio and virtual carrier, applied in the field of reducing the peak-to-average ratio of OFDM systems based on virtual carrier reservation algorithm, can solve the problem of high computational complexity, achieve system complexity balance, reduce computational complexity, and balance applicability Effect

Inactive Publication Date: 2009-06-17
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a low-complexity reduction of OFDM system peak-to-average power ratio (PAPR) based on the traditional virtual carrier reservation algorithm for OFDM system models under frequency-selective fading channels. The ratio method overcomes the defect of high computational complexity of the existing methods for reducing the peak-to-average ratio of OFDM systems

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  • Method for lowering PAR of OFDM system based on virtual carrier preservation algorithm
  • Method for lowering PAR of OFDM system based on virtual carrier preservation algorithm
  • Method for lowering PAR of OFDM system based on virtual carrier preservation algorithm

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Embodiment Construction

[0018] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0019] figure 1 It is a transceiving block diagram of the OFDM system applicable to the present invention. figure 1 In the process of data framing at the sending end, it is composed of preamble information and data information, and then QAM modulation, IFFT transformation, cyclic prefix insertion, and parallel-serial transformation are performed, and the generated OFDM time-domain data flow signal is converted It is an intermediate frequency signal and sent out. At the receiving end, the first step is to perform synchronization and channel estimation. After FFT transformation, the QAM symbols are demodulated and the bit error rate is estimated according to the estimated parameters.

[0020] figure 2 is the schemat...

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Abstract

The invention discloses a method for lowering the OFDM system peak-to-average power ratio on the basis of virtual carrier reservation algorithms in the wireless communication technology field. The technical scheme comprises: obtaining respective time domain signals ci and x of a set special frequency domain signal Ci and a frequency domain signal which carries useful information through IFFT transformation, calculating the initial PAPR value of the x, recording the value as PAPRmin, setting an all-zero time domain signal cfinal, calculating the PAPR value of two values of x+cfinal+ci and x+cfinal-ci sequences, comparing with PAPRmin, storing the minimum PAPR value into PAPRmin, enabling a special time domain signal which satisfies the minimum PAPR value at present to be ctemp, modifying cfinal=cfinal+ctemp until i=L, and selecting a combination with the minimum PAPR to send. The method effectively lowers the complexity and bit error rate of peak-to-average power ratio calculation, and the system reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for reducing the peak-to-average ratio of an OFDM system based on a virtual carrier reservation algorithm. Background technique [0002] As people's demand for communication broadband, personalization and mobility is getting higher and higher, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology has been widely used in various wireless communication fields. A major disadvantage of the OFDM system is that it has a high peak-to-average power ratio. The transmitted signal of the OFDM system is superimposed by the transmitted signals on multiple subcarriers. When these signals are added in the same phase, the instantaneous power of the obtained signal Very large, far exceeding the average power of the signal, resulting in a higher PAPR (Peak-to-Average Power Ratio, peak-to-average power ratio) in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 李旭姚道仓石靖
Owner BEIJING JIAOTONG UNIV
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