Method for realizing multicarrier VDE system modulation and demodulation of ship VDES system

An implementation method, modulation and demodulation technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as resource shortage and complex control, and achieve the effect of reducing complexity

Inactive Publication Date: 2017-05-10
BEIJING RES INST OF TELEMETRY +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provides a multi-carrier VDE system modulation and demodulation implementation method for a ship's VDES system, which overcomes the need to use multiple carrier digitally controlled oscillators in parallel when there are many sub-carriers (NCO) resource constraints and complex control issues, in addition the present invention has adopted multi-carrier modulation and demodulation in conjunction with the narrowband prototype filter bank to achieve each subcarrier spacing greater than the signal bandwidth

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  • Method for realizing multicarrier VDE system modulation and demodulation of ship VDES system

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Embodiment

[0044]In this embodiment, the data rate fa=78.6kbps of the multi-carrier VDE system of the ship's VDES system, the number of subcarriers N=32, the subcarrier spacing Δf=2.7kHz, the number of conversion points of the IFFT module and the FFT module is N, the prototype The filtering bandwidth of the filter bank is B=78.6kHz, and the carrier frequency Fc=160MHz.

[0045] If parallel NCOs are used to realize orthogonal modulation and demodulation, a total of 64 carrier NCOs need to be set at the transmitting and receiving ends. Although this method can also achieve the technical requirement that the subcarrier spacing is greater than 2.7kHz, the logic resources of the FPGA Extremely wasteful. If the IFFT transformation method of the present invention is used to realize modulation, the data signal is processed by IFFT transformation at the transmitting end, the subcarrier interval is 2.4kHz, and then through rate transformation, the original 2400 data points per second are transform...

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Abstract

The invention discloses a method for realizing multicarrier VDE system modulation and demodulation of a ship VDES system. According to the method, the modulation and demodulation of multicarrier VDE system information are realized by adopting fast Fourier transform (FFT) and fast Fourier inverse transform (IFFT), this modulation and demodulation realization mode can ensure complete orthogonality between subcarriers, and thus good modulation and demodulation performance and reliable transmission of signals are realized. By adoption of the method disclosed by the invention, the problems of resource strain and complex control caused by the adoption of multiple carrier numerically controlled oscillators (NCO) in parallel in the case of numerous subcarriers are solved. In addition, the intervals between the subcarriers are greater than a signal bandwidth is realized in a manner of combining multicarrier modulation and demodulation with a narrowband prototype filter, the harsh requirements of a demodulation terminal for frequency difference, code synchronization and other synchronization information in multipath and other serious communication environments of the system are reduced, and the complexity of realizing the VDE system modulation and demodulation is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of signal detection and demodulation, in particular to a multi-carrier VDE system modulation and demodulation realization method of a ship VDES system. The method is suitable for data modulation and demodulation in the case of many sub-carriers and bad communication environment. Background technique [0002] In October 2015, the International Telecommunication Union Recommendation ITU-R M.2092-0 proposed the technical characteristics of the VHF data exchange system (VDES) in the VHF maritime mobile frequency band, and made corresponding provisions on the communication technical characteristics of the VDE system in the VDES system , but there is no corresponding regulation on the implementation method. Especially for the realization of multi-subcarrier modulation and demodulation and subcarrier spacing greater than the signal bandwidth, the realization method is not clearly stated. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2628H04L27/264H04L27/265H04L27/2662
Inventor 吴鹏程刘向楠郭立浩武光辉林一
Owner BEIJING RES INST OF TELEMETRY
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