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CE-OFDM phase demodulation system and demodulation method

A technology of CE-OFDM and phase demodulation, which is applied in the field of signal phase modulation and demodulation, and can solve problems such as inaccurate demodulation results

Active Publication Date: 2019-11-29
COMMUNICATION UNIVERSITY OF CHINA
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Problems solved by technology

[0005] In order to overcome at least to a certain extent the problem that the traditional phase demodulation method cannot solve the frequency deviation, resulting in inaccurate demodulation results, this application provides a CE-OFDM phase demodulation system and demodulation method

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  • CE-OFDM phase demodulation system and demodulation method

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Embodiment Construction

[0066] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0067]figure 1 It is a block diagram of a CE-OFDM phase demodulation system provided by an embodiment of the present application.

[0068] Such as figure 1 As shown, the CE-OFDM phase demodulation system provided in this embodiment includes:

[0069] Input module 1, used for inputting the modulated signal in CE-OFDM;

[0070] The first Costas loop module 2 is used to generate the first original demodulated signal according to the modulated signal;

[0071] A frequency offset estimation module 3, configured to perform frequency offset estimation on the first original demodulated signal to generate frequency offset information;

[0072] The phase demodulation module 4 is configured to generate a final demodulated signal according to the frequency offset information.

[0073] The input module 1 performs phase modulation on the baseband OFDM signal to...

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Abstract

The invention relates to a CE-OFDM phase demodulation system and method. The CE-OFDM phase demodulation system comprises an input module for inputting a modulation signal in CE-OFDM. A first Costas loop module generates a first original demodulation signal according to the modulation signal. A frequency offset estimation module performs frequency offset estimation on the first original demodulation signal to generate frequency offset information. The phase demodulation module generates a final demodulation signal according to the frequency offset information. According to the invention, crosstalk of adjacent data caused by frequency deviation and even failure to normally decode information can be avoided, the phase demodulation module generates a final demodulation signal according to thefrequency deviation information, and the accuracy of the final demodulation signal is improved.

Description

technical field [0001] This application relates to the technical field of signal phase modulation and demodulation, especially a CE-OFDM phase demodulation system and demodulation method. Background technique [0002] CE-OFDM technology, that is, constant envelope OFDM (orthogonal frequency division multiplexing), refers to the phase modulation of the OFDM baseband signal, so that the obtained signal envelope amplitude is constant, and the peak-to-average ratio is as low as 0dB. The original OFDM signal can be recovered by phase demodulation. The CE-OFDM system not only has the advantages of the traditional OFDM system, but also overcomes the shortcomings of the peak-to-average power ratio, and has important application value in the field of wireless communication. [0003] The traditional phase demodulation method uses a method based on quadrature demodulation, that is, the phase-modulated CE-OFDM signal is mixed and down-converted with the quadrature signal and the in-pha...

Claims

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Application Information

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IPC IPC(8): H04L27/20H04L27/26H04L27/00
CPCH04L27/20H04L27/2627H04L27/0014H04L2027/0026
Inventor 陈超杨占昕
Owner COMMUNICATION UNIVERSITY OF CHINA
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