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Signal modulation and demodulation method capable of reducing peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal

A signal modulation and signal technology, applied in the field of OFDM signal transmission, can solve problems such as low computational complexity and achieve the effect of easy implementation

Inactive Publication Date: 2014-04-02
HANSHAN NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0013] The technical problem to be solved by the present invention is: how to effectively reduce the PAPR of the OFDM signal with low computational complexity

Method used

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  • Signal modulation and demodulation method capable of reducing peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal
  • Signal modulation and demodulation method capable of reducing peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal
  • Signal modulation and demodulation method capable of reducing peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal

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Embodiment Construction

[0039] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0040] The present invention divides the sub-carriers of the OFDM system (the total number is N) into two parts, one part is the useful sub-carrier (the number is N-L) for transmitting the signal to be transmitted; the other part is the sideband information sub-carrier (the number is L, L) figure 2 Shown is the frequency domain structure diagram of subcarriers. X is the signal to be transmitted and is placed at the position of the useful subcarrier. C is the frequency domain peak clipping signal, which is also placed in the useful subcarrier position. R is the sideband information, which is placed at the position of the sideband information subcarrier. The present invention reuses the useful sub-carrier part ...

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Abstract

The invention discloses a signal modulation method capable of reducing the peak to average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal, and relates to the technical field of OFDM signal transmission. The signal modulation method comprises the following steps of: 1, dividing N sub-carriers into L sideband information sub-carriers and N-L useful sub-carriers, wherein L is less than N; and 2, modulating signals to be transmitted onto the useful sub-carriers, extracting peak clipping signals C according to the parts, exceeding a target peak value, of the modulated signals, modulating the peak clipping signals C onto the useful sub-carriers, and modulating positions, amplitudes and phases exceeding a target peak value point onto the sideband information sub-carriers to form transmitted signals xtr. By the method, peak value points of the original signals can be accurately eliminated; and compared with the conventional method, the method is easier to implement.

Description

Technical field [0001] The present invention relates to the technical field of OFDM signal transmission, in particular to a signal modulation and demodulation method for reducing the PAPR of an OFDM signal. Background technique [0002] Methods to reduce the peak to average power ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) signals can be basically divided into limiting technology, coding technology and probability technology. The advantage of limiting technology is that it is relatively simple and easy to implement, but it will bring problems such as in-band interference and out-of-band power leakage, which will reduce the system's spectrum efficiency and bit error rate performance; coding technology is a linear process, which uses coding to avoid For those codewords with signal peaks, the original information codewords are mapped to a transmission code set with better PAPR characteristics. Although this type of technology will not cause signal distortion, i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 林炜鹏吴浚浩陈洪财谢世武陈燕娟刘秋武
Owner HANSHAN NORMAL UNIV