An information transmission system based on subcarrier migration

Abstract

The present invention discloses an information transmission system based on subcarrier migration, which belongs to the field of 5G information transmission technology. It includes an F-OFDM modulation unit, a subcarrier migration unit, a subband filter, a subband matching filter, a subcarrier reset unit, an F-OFDM overall demodulation unit and a spectrum sensing unit. The present invention uses subcarrier migration, subcarrier reset and F-OFDM overall demodulation technology, combined with the F-OFDM technology currently used in the 5G air interface, to effectively reduce the comb interference of the low-frequency band 5G channel on the system performance; through spectrum detection and spectrum optimization, spectrum cognition and anti-interference in complex electromagnetic environments are realized, and the environmental adaptability of the system in complex electromagnetic environments is improved. The present invention can be used in broadband information reliable transmission scenarios based on 5G technology, and is particularly suitable for low-frequency band 5G information transmission in complex electromagnetic environments.

Description

Technical Field

[0001] The present invention relates to the field of 5G information transmission technology, and in particular to an information transmission system based on subcarrier migration. Background Art

[0002] 5G technology is used in the field of information transmission. It has the advantages of improving network performance, efficiently processing massive data, and providing a wide range of service values. It is particularly suitable for deep integration with intelligent perception networks such as sensor networks and the Internet of Things to achieve reliable information transmission. At present, the 5G air interface uses F-OFDM to solve the problems of fixed bandwidth parameters and high out-of-band leakage in traditional OFDM technology. However, when facing complex electromagnetic environments, especially when facing low-frequency 5G channels dominated by comb interference, the existing F-OFDM technology has obvious deficiencies in anti-interference capabilities. Summary of the invention

[0003] In view of this, the present invention proposes an information transmission system based on subcarrier migration. The present invention can realize reliable transmission of broadband information based on 5G technology in complex electromagnetic environments, and significantly improve the anti-interference performance of the equipment compared with traditional 5G mobile transmission equipment.

[0004] The present invention is achieved through the following technical solutions:

[0005] An information transmission system based on subcarrier migration, comprising an F-OFDM modulation unit, a subcarrier migration unit, a subband filter, a subband matching filter, a subcarrier reset unit, an F-OFDM overall demodulation unit and a spectrum sensing unit;

[0006] The F-OFDM modulation unit performs subcarrier orthogonal modulation on the input coded information and sends the modulated OFDM signal to the subcarrier migration unit;

[0007] The subcarrier migration unit integrates the spectrum resource usage of the OFDM signal into spectrum usage information and sends it to the spectrum sensing unit;

[0008] The spectrum sensing unit performs spectrum detection on the acquired spatial environment signal, optimizes the spectrum resources according to the spectrum usage information, outputs the spectrum optimization result, and sends it back to the subcarrier migration unit;

[0009] Afterwards, the subcarrier migration unit, according to the spectrum optimization result, performs subcarrier orthogonal decoupling on the OFDM signal with interference in the frequency band, sequentially migrates it to the frequency band without interference, and sends the migrated OFDM signal to the subband filter;

[0010] The sub-band filter filters the migrated OFDM signal, suppresses adjacent band spectrum interference, and sends the filtered OFDM signal to the receiving end through the transmission channel;

[0011] The sub-band matched filter performs matched filtering on each sub-band OFDM signal received through the channel, and sends the filtered OFDM signal to the sub-carrier reset unit;

[0012] The subcarrier resetting unit integrates the spectrum resource usage of the filtered OFDM signal into spectrum usage information and sends it to the spectrum sensing unit;

[0013] The spectrum sensing unit sends the spectrum optimization result to the receiving end through the signaling channel, combines the spectrum usage information of the subcarrier resetting unit, obtains the spectrum resetting result, and sends it back to the subcarrier resetting unit;

[0014] Afterwards, the subcarrier resetting unit resets the subcarriers of the received OFDM signal in sequence according to the spectrum resetting result, and sends the reset OFDM signal to the F-OFDM overall demodulation unit;

[0015] The F-OFDM overall demodulation unit performs overall demodulation on the reset OFDM signal, extracts the baseband signal from the subcarrier, completes baseband signal decoding, and obtains service information.

[0016] Further, the spectrum sensing unit includes a spectrum detection module, a spectrum optimization module and a spectrum resetting module;

[0017] The spectrum detection module is used to obtain the space environment signal, detect and analyze the space environment signal, and send the spectrum detection result to the spectrum optimization module;

[0018] The spectrum optimization module receives the spectrum usage information sent by the subcarrier migration unit and the spectrum detection result sent by the spectrum detection module, optimizes the spectrum resources according to the spectrum detection result and the signal to interference noise ratio, sends the spectrum optimization result back to the subcarrier migration unit, and sends the spectrum optimization result to the spectrum reset module of the receiving end through the signaling channel;

[0019] The spectrum reset module receives the spectrum usage information of the subcarrier reset unit, combines the received spectrum optimization result, resets the spectrum order, and finally sends the spectrum reset result to the subcarrier reset unit.

[0020] Compared with the background technology, the present invention has the following advantages:

[0021] 1. The present invention adopts subcarrier migration, subcarrier reset and F-OFDM overall demodulation technology, combined with the F-OFDM technology currently used in 5G air interface, which can effectively reduce the impact of comb interference of low-frequency band 5G channels on system performance, thereby improving the system's anti-interference ability.

[0022] 2. The present invention adopts spectrum sensing technology to achieve spectrum cognition and anti-interference in complex electromagnetic environments through spectrum detection and spectrum optimization, thereby improving the environmental adaptability of the system in complex electromagnetic environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the electrical principle block diagram of the present invention;

[0024] Figure 2 is an electrical schematic diagram of a spectrum sensing unit of the present invention;

[0025] Figure 3 It is a spectrum diagram of subcarrier migration and resetting of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] An information transmission system based on subcarrier migration, Figure 1 It is an electrical principle block diagram of the system, which includes a F-OFDM modulation unit, a subcarrier migration unit, a subband filter, a subband matching filter, a subcarrier reset unit, a F-OFDM overall demodulation unit and a spectrum sensing unit.

[0028] The information enters the F-OFDM modulation unit, completes the subcarrier orthogonal modulation of the coded information, and sends the modulated signal to the subcarrier migration unit; the subcarrier migration unit sends the spectrum usage information to the spectrum sensing unit, the spectrum sensing unit performs spectrum detection on the spatial environment signal, optimizes the spectrum resources according to the spectrum usage information, and sends the spectrum optimization result back to the subcarrier migration unit; the subcarrier migration unit performs orthogonal decoupling on the subcarriers on the frequency band with severe interference according to the spectrum optimization result, and migrates them to a relatively clean frequency band in sequence; filtering is performed through subband filters to suppress adjacent band spectrum interference, and the receiving end uses a matched filter Realize the decoupling of each sub-band data; send the spectrum optimization result to the receiving end through the signaling channel, the spectrum sensing unit combines the spectrum usage information of the subcarrier reset unit to obtain the spectrum reset result, and send it to the subcarrier reset unit; the subcarrier reset unit resets the received subcarriers in sequence according to the spectrum reset result, and sends the reset subcarriers to the F-OFDM overall demodulation unit; the F-OFDM overall demodulation unit demodulates the restored subcarriers as a whole, that is, extracts the baseband signal from the carrier, and then sends it to the decoder. The decoder completes the baseband signal decoding according to the decoding principle and finally obtains the service information.

[0029] Figure 2It is the electrical schematic diagram of the spectrum sensing unit in this system. The spectrum sensing unit includes a spectrum detection module, a spectrum optimization module and a spectrum reset module; the space environment signal enters the spectrum detection module, the spectrum detection module detects and analyzes the signal, and sends the spectrum detection result to the spectrum optimization module; the subcarrier migration unit sends the spectrum usage information to the spectrum optimization module, the spectrum optimization module optimizes the spectrum resources according to the spectrum detection result and the signal-to-interference-noise ratio, and sends the spectrum optimization result back to the subcarrier migration unit; the spectrum optimization result is sent to the receiving end through the signaling channel, the subcarrier reset unit sends the spectrum usage information to the spectrum reset module, the spectrum reset module combines the received spectrum optimization result, resets the spectrum order, and finally sends the spectrum reset result to the subcarrier reset unit.

[0030] Figure 3 It is a spectrum diagram of subcarrier migration and reset of the present invention. The subcarrier migration unit integrates the spectrum resource usage such as the used frequency bands and available frequency bands of the entire spectrum into spectrum usage information and sends it to the spectrum sensing unit; the spectrum sensing unit optimizes the spectrum resources according to the spectrum detection result of the spectrum detection module on the space environment signal, and sends the spectrum optimization result to the subcarrier migration unit. The subcarrier migration unit orthogonally decouples the subcarriers with interference in the frequency band according to the spectrum optimization result, and migrates them to the undisturbed frequency band in sequence; at the receiving end, the subcarrier reset unit resets the subcarriers in sequence according to the spectrum reset result, and finally sends them to the F-OFDM overall demodulation unit to complete the overall demodulation.

[0031] The brief principle of this system is as follows:

[0032] This system adopts a combination of subcarrier migration and spectrum sensing. The spectrum sensing unit detects and optimizes the spatial environment signals, migrates the interfered subcarriers in the frequency band to the available frequency band without interference, resets the subcarriers at the receiving end, and finally completes the overall F-OFDM demodulation, thereby realizing spectrum cognitive anti-interference and significantly improving the system's anti-interference capability.

[0033] In summary, the present invention proposes an information transmission system based on subcarrier migration to address the comb interference in low-frequency 5G channels under complex electromagnetic environments. The present invention uses subcarrier migration, subcarrier reset and F-OFDM overall demodulation technology, combined with the F-OFDM technology currently used in 5G air interfaces, to effectively reduce the impact of comb interference in low-frequency 5G channels on system performance; through spectrum detection and spectrum optimization, spectrum recognition and anti-interference in complex electromagnetic environments are achieved, and the environmental adaptability of the system in complex electromagnetic environments is improved.

[0034] The present invention can be used in broadband information reliable transmission scenarios based on 5G technology, and is particularly suitable for low-frequency band 5G information transmission in complex electromagnetic environments.

Claims

1. An information transmission system based on subcarrier migration, characterized in that: It includes an F-OFDM modulation unit, a subcarrier migration unit, a subband filter, a subband matching filter, a subcarrier reset unit, an F-OFDM overall demodulation unit and a spectrum sensing unit; The F-OFDM modulation unit performs subcarrier orthogonal modulation on the input coded information and sends the modulated OFDM signal to the subcarrier migration unit; The subcarrier migration unit integrates the spectrum resource usage of the OFDM signal into spectrum usage information and sends it to the spectrum sensing unit; The spectrum sensing unit performs spectrum detection on the acquired spatial environment signal, optimizes the spectrum resources according to the spectrum usage information, outputs the spectrum optimization result, and sends it back to the subcarrier migration unit; Afterwards, the subcarrier migration unit, according to the spectrum optimization result, performs subcarrier orthogonal decoupling on the OFDM signal with interference in the frequency band, sequentially migrates it to the frequency band without interference, and sends the migrated OFDM signal to the subband filter; The sub-band filter filters the migrated OFDM signal, suppresses adjacent band spectrum interference, and sends the filtered OFDM signal to the receiving end through the transmission channel; The sub-band matched filter performs matched filtering on each sub-band OFDM signal received through the channel, and sends the filtered OFDM signal to the sub-carrier reset unit; The subcarrier resetting unit integrates the spectrum resource usage of the filtered OFDM signal into spectrum usage information and sends it to the spectrum sensing unit; The spectrum sensing unit sends the spectrum optimization result to the receiving end through the signaling channel, combines the spectrum usage information of the subcarrier resetting unit, obtains the spectrum resetting result, and sends it back to the subcarrier resetting unit; Afterwards, the subcarrier resetting unit resets the subcarriers of the received OFDM signal in sequence according to the spectrum resetting result, and sends the reset OFDM signal to the F-OFDM overall demodulation unit; The F-OFDM overall demodulation unit performs overall demodulation on the reset OFDM signal, extracts the baseband signal from the subcarrier, completes baseband signal decoding, and obtains service information; The spectrum sensing unit includes a spectrum detection module, a spectrum optimization module and a spectrum resetting module, wherein: The spectrum detection module is used to obtain the space environment signal, detect and analyze the space environment signal, and send the spectrum detection result to the spectrum optimization module; The spectrum optimization module receives the spectrum usage information sent by the subcarrier migration unit and the spectrum detection result sent by the spectrum detection module, optimizes the spectrum resources according to the spectrum detection result and the signal to interference noise ratio, sends the spectrum optimization result back to the subcarrier migration unit, and sends the spectrum optimization result to the spectrum reset module of the receiving end through the signaling channel; The spectrum reset module receives the spectrum usage information of the subcarrier reset unit, combines the received spectrum optimization result, resets the spectrum order, and finally sends the spectrum reset result to the subcarrier reset unit.

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