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Modulating method and device as well as demodulating method and device of GFDM (Generalized Frequency Division Multi-plex) signal

A signal and modulation signal technology, applied in the field of signal processing, can solve problems such as high PAPR, signal distortion, GFDM signal overshoot, etc.

Active Publication Date: 2017-12-01
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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Problems solved by technology

[0003] In GFDM (Generalized Frequency Division Multi-plex, generalized frequency division multiplexing system), since the GFDM signal is superimposed by multiple single-carrier signals, the PAPR is high, and too high PAPR may cause the GFDM signal to exceed the optical modulation The linear range of optical devices such as optical devices causes distortion of the GFDM signal in the optical radio frequency system and affects the overall performance of the transmission system

Method used

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  • Modulating method and device as well as demodulating method and device of GFDM (Generalized Frequency Division Multi-plex) signal
  • Modulating method and device as well as demodulating method and device of GFDM (Generalized Frequency Division Multi-plex) signal
  • Modulating method and device as well as demodulating method and device of GFDM (Generalized Frequency Division Multi-plex) signal

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Embodiment approach

[0140] As an implementation manner of the embodiment of the present invention, the random filter pulse determination module 630 may include:

[0141] The first pulse shaping unit ( Figure 6 Not shown in ), used to perform pulse shaping on symbols in the signal sequence to be modulated corresponding to the binary number by using a root-raised cosine filter when the value of the binary number is 1;

[0142] The second pulse shaping unit ( Figure 6 not shown in ), used to perform pulse shaping on symbols in the signal sequence to be modulated corresponding to the binary number by using a raised cosine filter when the value of the binary number is 0.

[0143] As an implementation manner of the embodiment of the present invention, the random phase sequence determination module 650 may include:

[0144] Impulse response value determination unit ( Figure 6 not shown in ) for determining each impulse response value of the random filter impulse;

[0145] The first mapping unit (...

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Abstract

The embodiment of the invention provides a modulating method and device as well as a demodulating method and device of a GFDM (Generalized Frequency Division Multi-plex) signal. the modulating method comprises the following steps: acquiring an original signal to be modulated; shaping a pulse to obtain a random filter pulse; performing a cyclic convolution on a signal to be modulated sequence and the random filter pulse to obtain a first modulated signal; mapping the random filter pulse into a random phase sequence; returning a dot product of the first modulating signal and the random phase sequence for serving as a second modulating signal till circular times are up to a preset value; calculating a peak-to-average power ratio of each path of a time-domain signal; and determining a path of the time-domain signal with lowest peak-to-average power ratio as a modulated signal to be transmitted. As proved by the invention, through the pulse shaping and random phase sequence mapping, a path of the signal with the lowest peak-to-average power ratio can be determined as the signal to be transmitted, and the peak-to-average power ratio of the GFDM signal can be lowered remarkably.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and device for modulating and demodulating GFDM signals. Background technique [0002] In radio frequency communication systems over optical, a high peak-to-average power ratio (Peak to Average Power Ratio, PAPR) is an important factor affecting signal transmission. In order to ensure reliable transmission of information, the signal modulation process used by the transmitter to reduce the peak-to-average power ratio needs to be highly effective and reliable, so as to ensure the accuracy of modulated signal transmission. It can be seen that the effect of reducing the peak-to-average power ratio is directly related to the nonlinear performance of the entire system and the accuracy of data transmission, so it has important practical significance. [0003] In GFDM (Generalized Frequency Division Multi-plex, generalized frequency division multiplexing system), sinc...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03H04L27/34H04B10/69H04B10/2575
CPCH04B10/2575H04B10/6971H04L25/03834H04L25/03878H04L27/2614H04L27/2634H04L27/2649H04L27/2697H04L27/34
Inventor 忻向军刘博张丽佳张琦王拥军田清华饶岚任珊珊
Owner BEIJING UNIV OF POSTS & TELECOMM
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