Method for reducing PAPR (Peak To Average Power Ratio) under APSK (Amplitude Phase Shift Keying) constellation diagram

A constellation diagram and constellation point technology, applied in the field of digital information transmission, can solve the problem of increasing the requirements of hardware design

Active Publication Date: 2012-11-07
TSINGHUA UNIV +1
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This increases hardware design...

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  • Method for reducing PAPR (Peak To Average Power Ratio) under APSK (Amplitude Phase Shift Keying) constellation diagram
  • Method for reducing PAPR (Peak To Average Power Ratio) under APSK (Amplitude Phase Shift Keying) constellation diagram
  • Method for reducing PAPR (Peak To Average Power Ratio) under APSK (Amplitude Phase Shift Keying) constellation diagram

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[0043] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] The main idea of ​​the present invention is to limit the amplitude of the signal in the time domain, and when changing the time domain signal back to the frequency domain constellation points, only retain those outwardly extended frequency domain constellation points, and iterate the process multiple times, so as to Reduce the probability of peak signal occurrence, thereby reducing the PAPR of OFDM symbols.

[0045] The method for reducing APSK constellation diagram modulation PAPR according to the present invention, comprises steps:

[0046] S1. Time-domain clipping: The frequency-domain constellation point signal X of each OFDM symbol is transformed by IFFT, up-s...

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Abstract

The invention provides a method for reducing a peak average power ratio (PAPR) under APSK (Amplitude Phase Shift Keying) constellation diagram mapping in OFDM (Orthogonal Frequency Division Multiplexing) modulation. According to the method provided by the invention, as the amplitude of signals is limited on a time domain, when time domain signals are converted onto frequency domain constellation points, only the constellation points at an outer layer of the APSK are expanded, only the frequency domain constellation points expanding outwards are remained, and a process of time domain amplitude limitation-frequency domain selection expansion is iterated for a plurality of times. Therefore, the rate of occurring peak signals can be reduced, and the PAPR of the OFDM signals can be reduced. According to the algorithm, an expansion area and an expansion rule are designed under the APSK constellation diagram mapping, so that the error code property cannot be worsened under the APSK modulation. The method provided by the invention can be applied to an OFDM system under the APSK constellation diagram mapping, so that the effect of reducing the PAPR can be achieved well.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to the problem of reducing the peak-to-average ratio (PAPR) in an OFDM communication system. Background technique [0002] In digital signal transmission, multi-carrier modulation naturally has a good ability to resist multipath interference and frequency selective fading. The basic idea of ​​multi-carrier modulation is to convert serial high-speed (broadband) data information into N groups of parallel low-speed data streams through serial-to-parallel conversion, and N groups of parallel data use N mutually orthogonal carriers (called sub-carriers). Carrier) for modulation, superimposed in the time domain and transmitted in parallel. Multi-carrier modulation makes the frequency bandwidth of each parallel signal 1 / N of the original serial data signal bandwidth, which can more easily meet the condition of being smaller than the coherent bandwidth ...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 王军罗子威潘长勇张彧王劲涛杨知行
Owner TSINGHUA UNIV
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