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OFDM signal peak-to-average ratio inhibition method based on hyperbolic companding and combined amplitude limit

A technology of hyperbolic pressure and signal peak, applied in the direction of multi-frequency code system, etc., can solve the problems of low bit error rate of the system, difficulty in flexible change, and reduction of signal peak-to-average ratio, so as to achieve small out-of-band radiation of the signal and improve the improvement effect , Reduce the effect of signal interference

Inactive Publication Date: 2012-01-18
西安电子科技大学昆山创新研究院
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Problems solved by technology

Jun Hou proposed a segmented companding method in "Peak-to-Average Power Ratio Reduction of OFDM Signals With Nonlinear Companding Scheme". The basic idea of ​​this method is to make the companded OFDM signal amplitude first obey the Rayleigh distribution and then obey the Uniform distribution, although this method can effectively reduce the signal peak-to-average ratio PAPR, and the system bit error rate BER is also low, but it is difficult to flexibly change to meet the performance requirements of different systems

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  • OFDM signal peak-to-average ratio inhibition method based on hyperbolic companding and combined amplitude limit
  • OFDM signal peak-to-average ratio inhibition method based on hyperbolic companding and combined amplitude limit
  • OFDM signal peak-to-average ratio inhibition method based on hyperbolic companding and combined amplitude limit

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Embodiment Construction

[0037] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0038] Refer to attached figure 1 , the present invention is based on the OFDM signal peak-to-average ratio suppression method of hyperbolic companding and joint limiting at the OFDM system sending end, and its specific implementation steps are as follows:

[0039] Step 1: Carry out quadrature amplitude modulation (QAM) to the data bit stream produced by the information source, and map the data bit stream into quadrature amplitude modulation QAM symbols: X=(X 0 , X 1 ,L,X m ,L,X N-1 ), wherein, m=0, 1, L, N-1, N represents the number of subcarriers included in the OFDM system;

[0040] Step ...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average ratio inhibition method based on hyperbolic companding and combined amplitude limit, and mainly solves a high peak-to-average ratio problem of a wireless OFDM communication system transmission signal. The method comprises the following steps: (1) carrying out orthogonal intersection amplitude modulation on data bit stream generated by an information source; (2) carrying out OFDM modulation after serial-parallel conversion of an orthogonal intersection amplitude modulation symbol, and obtaining an original OFDM signal; (3) carrying out amplitude limit and companding conversion on the original OFDM signal; (4) calculating an OFDM signal peak-to-average ratio after conversion, followed by emitting after conversion; (5) carrying out serial-parallel conversion and decompression expansion on a received signal; (6) carrying out OFDM and quadrature amplitude demodulation on a decompression expansion signal, and calculating a signal error rate. According to the invention, a compromise is reached between OFDM signal peak-to-average ratio inhibition and system error rate performance, mean power constancy of a signal before and after signal companding is guaranteed, and the method can be applied to a variety of broadband wireless OFDM communication systems.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a peak-to-average ratio (PAPR) suppression method based on orthogonal frequency division multiplexing OFDM modulation wireless communication system transmission signals, which can be widely applied to signal peak-to-average ratio in various new-generation broadband OFDM wireless communication systems PAPR inhibition. Background technique [0002] Orthogonal frequency division multiplexing OFDM modulation technology has high spectrum utilization efficiency and good anti-frequency selective fading performance, and has become one of the key technologies of the new generation of wireless mobile communication systems. At present, OFDM modulation technology has been widely used in digital audio broadcasting (Digital Audio Broadcasting, DAB), Digital Video Terrestrial Broadcasting (Terrestrial Digital Video Broadcasting, DVB-T), Wireless Local Area Networks (Wireless Local ...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 王勇王丽花葛建华宫丰奎李靖
Owner 西安电子科技大学昆山创新研究院
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