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Amplitude limiting reserved sub carrier wave reduction PAPR method and system based on amplitude proportion factors

A technology for reserving sub-carriers and scaling factors, applied in multi-frequency code systems, electrical components, power management, etc., can solve the problems of increased times and high complexity of the virtual carrier reservation algorithm, so as to reduce the complexity and improve the frequency band. Utilization rate, the effect of reducing PAPR

Inactive Publication Date: 2010-07-07
BEIJING JIAOTONG UNIV
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Problems solved by technology

It can be seen that this traditional subcarrier reservation algorithm needs a total of K L IFFT operation, and with the increase of the number of sub-carriers N, or the number of IFFT operations required to reduce the increase of the number of peak carriers L will also increase significantly, so the complexity of the traditional virtual carrier reservation algorithm is relatively large

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  • Amplitude limiting reserved sub carrier wave reduction PAPR method and system based on amplitude proportion factors
  • Amplitude limiting reserved sub carrier wave reduction PAPR method and system based on amplitude proportion factors
  • Amplitude limiting reserved sub carrier wave reduction PAPR method and system based on amplitude proportion factors

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Embodiment Construction

[0027] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The idea of ​​reserving subcarriers is to superimpose a frequency-domain signal with a special structure and a frequency-domain signal carrying useful information, so that the time-domain signal obtained by the former after IFFT operation can effectively reduce the corresponding frequency of the latter. The peak value of the time-domain signal, so as to achieve the purpose of reducing the system PAPR, does not need to transmit sideband information, and has lower complexity compared with other peak-to-average ratio reduction algorithms.

[0029] In the traditional reserved subcarrier algorithm, the frequency domain signal C with a special structure is selected according to the traversal search method. The basic idea is: amon...

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Abstract

The invention discloses an amplitude limiting reserved sub carrier wave reduction PAPR method and a system based on amplitude proportion factors. The method comprises the following steps: determining the sub carrier wave number N in a peak eliminating sequence, the reserved sub carrier wave number L in the sub carrier waves and the positions of the reserved sub carrier waves according to the parameter requirements of an OFDM system; giving a PAPR threshold value B and an amplitude factor set R; obtaining a frequency domain ideal peak eliminating sequence D according to the PAPR threshold value B; obtaining L values on the reserved sub carrier waves according to the frequency domain ideal peak eliminating sequence, allocating a datum 0 for other N-L sub carrier waves, and further determining a frequency domain peak eliminating sequence C; and carrying out reverse Fourier transformation on the frequency domain peak eliminating sequence C to obtain a time domain peak eliminating sequencec(n), and obtaining transmission signals z(n) through subtracting the x(n) and the c(n). The invention replaces the traditional iteration method with the amplitude proportion factor method to find the optimal peak eliminating sequence, and greatly reduces the system complexity.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and system for reducing PAPR by limiting and reserving subcarriers based on amplitude scale factors. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) is a hot technology in the communication field in recent years. It has been adopted by many current hot communication systems due to its strong anti-interference performance, high spectrum utilization rate, strong anti-fading ability and data transmission rate. Adopted, it is regarded as the core technology in the next generation of mobile communication. However, OFDM technology faces many theoretical and practical problems that need to be solved in wireless communication systems, and the problem of peak-to-average power ratio is a major problem it faces. [0003] Compared with the single-carrier system, the instantaneous value of the output signal of the OFDM system transmitter will flu...

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Application Information

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IPC IPC(8): H04L27/26H04W52/04
CPCY02B60/50
Inventor 李旭陈诚
Owner BEIJING JIAOTONG UNIV
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