CN113328810A - Chirp multiplexing terahertz communication perception integrated system - Google Patents
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Abstract
The invention discloses a chirp-multiplexing terahertz communication perception integrated system which comprises a communication signal modulation module, a chirp-based modulation module, a chirp multiplexing module, a digital-to-analog conversion module, an optical/electric terahertz transmitting end module, an optical/electric terahertz receiving end module, an analog-to-digital conversion module, a chirp demultiplexing module, a communication signal demodulation module and a radar perception processing module. The method realizes the organic integration of ultra-high-speed terahertz communication and high-precision terahertz sensing by using the chirp multiplexing method, weakens the separation among signals from the viewpoint of taking the integrated signals into consideration of the performance requirement of communication sensing, and has the advantages of high spectrum efficiency, flexibility and configurability and low system cost.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a chirp multiplexing terahertz communication perception integrated system.
Background
Wireless communication and sensing has enjoyed tremendous success over the last decades, providing a completely new platform for people to communicate and interact information. The wireless communication and the sensing have essential technical differences in the traditional concept, the wireless communication mainly adopts a continuous wave mode such as digital or analog modulation to realize an information transmission function, and the wireless sensing represented by a radar technology mainly adopts a pulse wave mode such as a frequency modulation signal to realize functions such as wireless detection, distance measurement and the like. However, wireless communication and sensing are showing many points of commonality. On one hand, the coincidence degree of the communication and perception application scene and the terminal is obvious. By taking an example of intelligent traffic, an unmanned automobile needs to complete vehicle-vehicle and vehicle-human communication and also needs to sense the traffic environment, and information obtained by communication and sensing can supplement each other to complete a series of complex tasks. On the other hand, the communication and sensing systems have similar structures and require a wireless transceiver and a signal processing module unit, and both adopt transmission media mainly comprising electromagnetic waves, so that the frequency resources are greatly overlapped. Therefore, the communication-aware integrated system is an important trend in the development of the wireless technology field.
The high-frequency ultra-wideband wireless technology is the development direction of a communication and perception integrated system. On one hand, the frequency rise brings more frequency spectrum resources, and the realization of ultra-high speed communication transmission is promoted; on the other hand, the accuracy of sensing performance such as distance resolution is also in direct proportion to the bandwidth, and the wider frequency band can enhance the environmental perception of the system. In conclusion, the high-frequency ultra-wideband wireless system is a key technical support for realizing the integration of communication perception. Terahertz wave generally refers to electromagnetic wave with frequency of 0.1 THz-10 THz and is in a transition frequency band from macroscopic electronics to microscopic photonics. The terahertz waves break through the bandwidth limitation of a microwave frequency band, and the rich frequency spectrum resources of the terahertz waves effectively support the realization of ultra-high-speed wireless communication and high-precision wireless sensing, so that the terahertz waves are an ideal carrier for high-performance communication and sensing integration.
Through the search of the existing documents, the existing design scheme that the terahertz communication perception integrated system is still separated from the physical layer is found, and although certain system integration is realized, the efficiency of the system is not substantially improved. For example, in s.jia, s.wang, which is published in 2018, "a Unified System with Integrated Generation of High-Speed Communication and High Resolution Sensing Based on THz Photonics" realizes the Communication signal transmission in the terahertz frequency band of 56Gbit/s and the terahertz chirp transmission with a bandwidth of 28GHz by the wavelength division multiplexing of digital modulation signals and the chirp optical domain, however, the System scheme still adopts the idea of frequency domain separation, occupies a bandwidth of about 60GHz as a whole, and has low spectral efficiency. In addition, the communication and sensing signals of the scheme adopt completely different waveforms, integration is not really realized, and the cost of the terminal is high.
In summary, the problem that the performance requirement of communication sensing cannot be considered by integrated signals in the related research of the terahertz communication sensing integrated system at present is a great obstacle to the application of the terahertz communication sensing integrated system, and the problem is mainly solved by the invention. The terahertz communication and perception integrated system adopts a unified signal scheme, a communication and perception integrated system framework which is efficiently integrated is designed, separation among signals is weakened, and the terahertz communication and perception integrated system is the key for realizing the high-performance terahertz communication and perception integrated system.
Disclosure of Invention
The invention aims to provide a chirp multiplexing terahertz communication perception integrated system aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a chirp multiplexing terahertz communication perception integrated system comprises an optical/electric terahertz transmitting end, an optical/electric terahertz receiving end and a radar perception processing module; the optical/electric terahertz transmitting end comprises a communication signal modulation module, a chirp basis modulation module, a chirp multiplexing module, a digital-to-analog conversion module and an optical/electric terahertz transmitting end module which are sequentially connected; the optical/electric terahertz receiving end comprises an optical/electric terahertz receiving end module, an analog-to-digital conversion module, a chirp demultiplexing module and a communication signal demodulation module which are sequentially connected; the radar perception processing module is respectively connected with the output end of the chirp multiplexing module in the optical/electric terahertz transmitting end and the input end of the chirp demultiplexing module in the optical/electric terahertz receiving end module.
The communication signal modulation module is used for modulating the communication data signal to a high-order modulation signal format. According to different communication signal modulation methods, the high-order modulation signal format adopted by the system comprises the following steps: pulse amplitude modulation signals, quadrature amplitude modulation signals, carrierless amplitude phase modulation signals and duobinary signals.
The chirp-based modulation module is used for multiplying the high-order modulation signal output by the communication signal modulation module by a group of orthogonal chirp-based signals, modulating the communication signal corresponding to the high-order modulation signal to a sensing signal corresponding to the group of orthogonal chirp-based signals to form a uniform waveform, realizing communication and sensing integrated chirp-based modulation, and outputting a chirp-based modulated signal; the chirp-based signals are orthogonal chirp signals or orthogonal chirp-like signals, a group of orthogonal chirp-based signals is generated by adopting a kernel function set of Fresnel transformation or a kernel function set of discrete Fresnel transformation, and a correlation value of any two chirp-based signals in the group of orthogonal chirp-based signals is zero.
The chirp multiplexing module is used for superposing chirp-based modulated signals output by the chirp-based modulation module, realizing communication and perception integrated chirp multiplexing of a group of orthogonal chirp signals, and outputting communication and perception integrated chirp multiplexing signals.
The digital-to-analog conversion module is used for converting the digital domain of the communication and perception integrated chirp multiplexing signal output by the chirp multiplexing module into an analog domain and outputting the communication and perception integrated chirp multiplexing signal of the analog domain.
The optical/electric terahertz transmitting end module is used for modulating the communication and perception integrated chirp multiplexing signal of the analog domain output by the digital-to-analog conversion module to a terahertz frequency band and realizing transmission.
The optical/electric terahertz receiving end module is used for receiving the communication and perception integrated chirp multiplexing signal of the analog domain to a baseband through a terahertz frequency band.
The analog-to-digital conversion module is used for converting an analog domain of the communication and perception integrated chirp multiplexing signal received by the optical/electric terahertz receiving end module into a digital domain and outputting the digital domain communication and perception integrated chirp multiplexing signal.
The chirp demultiplexing module is used for demultiplexing the digital domain communication and perception integrated chirp multiplexing signal output by the analog-to-digital conversion module, multiplying the digital domain communication and perception integrated chirp multiplexing signal by the orthogonal chirp basis corresponding to the chirp basis modulation module, and outputting a high-order modulation signal.
The communication signal demodulation module is used for demodulating the high-order modulation signal output by the chirp demultiplexing module into a communication data signal.
The radar perception processing module calculates radar perception information of the system by utilizing the communication and perception integrated chirp multiplexing signals output by the chirp multiplexing module and the digital domain communication and perception integrated chirp multiplexing signals output by the analog-to-digital conversion module.
Further, the high-order modulation signal format adopted by the communication signal modulation module includes: pulse amplitude modulation signal, quadrature amplitude modulation signal, carrierless amplitude phase modulation signal, duobinary signal.
Furthermore, the chirp-based signals of the chirp-based modulation module are orthogonal chirp signals or orthogonal chirp-like signals, and the correlation value of any two chirp-based signals is zero; wherein j is an imaginary unit (j)2The number of a group of orthogonal chirp-based signals is N, the duration of the signals is T, and the time domain expression mode of the nth chirp-based signal c (T) under fresnel transform is as follows:
furthermore, the chirp multiplexing module performs chirp phase transformation after utilizing a fast Fourier transform algorithm or an inverse Fourier transform algorithm; the chirp phase transformation in the realization of communication and perception integrated chirp multiplexing signals is firstly multiplied by a chirp phase transformation vector P on the dimensionality of each chirp basis by using the chirp phase transformation in the realization of chirp phase transformation under discrete Fresnel transformation1Then multiplying each symbol dimension by a chirp phase transformation vector P2。P1And P2The mathematical expression of (a) is as follows:
P1＝[1,exp(-j·12·π/N),exp(-j·22·π/N),...,exp(-j·(N-1)2·π/N)]
P2＝[exp(jπ/4)，exp(jπ/4-j·12·π/M),exp(jπ/4-j·22·π/M),...,exp(jπ/4-j·(M-1)2·π/M)]
further, the mechanism adopted by the optical/electrical terahertz transmitting terminal module comprises: terahertz modulation of an electronic solid-state frequency doubling chain, photoelectric heterodyne beat frequency terahertz modulation and terahertz modulation of a photoconductive antenna; the terahertz modulation method of the electronic solid-state frequency doubling chain specifically comprises the following steps: the communication and perception integrated chirp multiplexing signal of an analog domain is modulated to an intermediate frequency band, and then the signal is modulated to a terahertz frequency band through an electronic frequency doubling mixing diode for transmission; the photoelectric heterodyne beat frequency terahertz modulation specifically comprises the following steps: the communication and perception integrated chirp multiplexing signal of an analog domain is modulated to an optical baseband and then coupled with another optical carrier, the frequency difference of the two optical signals corresponds to a terahertz frequency band, and the coupled optical signals generate terahertz signals through a photoelectric heterodyne beat frequency mechanism of a photoelectric detector to be transmitted.
Further, the mechanism adopted by the optical/electrical terahertz receiving end module comprises: the terahertz down-conversion receiving of the electronic solid-state frequency doubling chain and the terahertz receiving of the photoconductive antenna are realized.
Furthermore, the chirp demultiplexing module performs inverse chirp phase transformation after utilizing a fast fourier transform algorithm; the chirp base signal number corresponding to the communication and perception integrated chirp multiplexing signal is N, the symbol number is M, and the chirp phase inverse transformation in the realization of chirp demultiplexing by adopting discrete inverse Fresnel transformation under chirp demultiplexing is firstly multiplied by a chirp phase inverse transformation vector P on the dimensionality of each symbol3Then multiplying the chirp phase inverse transformation vector P on the dimension of each chirp base4。P3And P4The mathematical expression of (a) is as follows:
P3＝[exp(-jπ/4)，exp(-jπ/4+j·12·π/M),exp(-jπ/4+j·22·π/M),...,exp(-jπ/4+j·(M-1)2·π/M)]
P4＝[1,exp(j·12·π/N),exp(j·22·π/N),...,exp(j·(N-1)2·π/N)]
further, the radar processing algorithm adopted by the radar perception processing module is preferably: time-of-flight algorithm, range-doppler algorithm.
Further, the radar sensing information comprises the distance between a target and the optical/electric terahertz transmitting end, the moving speed of the target, and two-dimensional and three-dimensional shape information of the target, which are detected by using the communication and sensing integrated chirp multiplexing signal.
Compared with the prior art, the invention has the beneficial effects that: the terahertz communication and sensing integrated system is improved, the ultra-high-speed terahertz communication and the high-precision terahertz sensing are organically integrated, from the viewpoint that the performance requirements of the communication sensing are considered by the integrated signals, the terahertz communication signals and the sensing signals are integrated into the integrated signals by using a chirp multiplexing mode, the communication and sensing integrated system architecture with high-efficiency integration is designed, the separation among the signals is weakened, and the terahertz communication and sensing integrated system has the advantages of high spectrum efficiency, flexibility, configurability and low system cost.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a time domain waveform effect diagram of the chirp multiplexing method.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a chirp multiplexing terahertz communication perception integrated system, which has a structural schematic diagram shown in figure 1 and comprises an optical/electric terahertz transmitting end, an optical/electric terahertz receiving end and a radar perception processing module; the optical/electric terahertz transmitting end comprises a communication signal modulation module, a chirp basis modulation module, a chirp multiplexing module, a digital-to-analog conversion module and an optical/electric terahertz transmitting end module which are sequentially connected; the optical/electric terahertz receiving end comprises an optical/electric terahertz receiving end module, an analog-to-digital conversion module, a chirp demultiplexing module and a communication signal demodulation module which are sequentially connected; the radar perception processing module is respectively connected with the output end of the chirp multiplexing module in the optical/electric terahertz transmitting end and the input end of the chirp demultiplexing module in the optical/electric terahertz receiving end module.
And the communication signal modulation module is used for modulating the communication data signal to a high-order modulation signal format. According to different communication signal modulation methods, the high-order modulation signal format adopted by the system comprises the following steps: pulse amplitude modulation signal, quadrature amplitude modulation signal, carrierless amplitude phase modulation signal, duobinary signal. Taking the qam signal as an example, it converts the data into parallel transmission, and then performs X-order signal mapping according to the channel condition, where X may be: 4. 8, 16, 32, 64, etc., the signal includes real and imaginary components. Taking the pwm signal as an example, it converts the data into parallel transmission, and then performs X-order signal mapping according to the channel condition, where X may be: 2. 4, 8, etc., the signal comprises only a real part.
The chirp-based modulation module is used for multiplying the high-order modulation signal output by the communication signal modulation module by a group of orthogonal chirp-based signals, modulating the communication signal corresponding to the high-order modulation signal to a sensing signal corresponding to the group of orthogonal chirp-based signals to form a uniform waveform, realizing communication and sensing integrated chirp-based modulation, and outputting a chirp-based modulated signal; the chirp-based signals are orthogonal chirp signals or orthogonal chirp-like signals, a group of orthogonal chirp-based signals is generated by adopting a kernel function set of Fresnel transformation or a kernel function set of discrete Fresnel transformation, and a correlation value of any two chirp-based signals in the group of orthogonal chirp-based signals is zero. Assuming that the number of orthogonal chirp-based signals is N, the duration of the signals is T, and j is an imaginary unit (j)21), the time domain expression of the nth chirp-based signal c (t) under the fresnel transform is:
and the chirp multiplexing module is used for superposing the chirp-based modulated signals output by the chirp-based modulation module, realizing communication and perception integrated chirp multiplexing of a group of orthogonal chirp signals and outputting communication and perception integrated chirp multiplexing signals. The chirp multiplexing is realized by performing chirp phase transformation after a fast Fourier transformation algorithm or an inverse Fourier transformation algorithm. The chirped phase transformation consists of the multiplication of two chirped phase transformation vectors. Assuming that the number of chirp-based signals corresponding to the communication and perception integrated chirp multiplexing signal is N and the number of symbols is M, the chirp-phase transformation in the realization of chirp-based multiplexing by adopting discrete Fresnel transformation is firstly multiplied by a chirp-phase transformation vector P in the dimension of each chirp-based signal1Then multiplying each symbol dimension by a chirp phase transformation vector P2。P1And P2The mathematical expression of (a) is as follows:
P1＝[1,exp(-j·12·π/N),exp(-j·22·π/N),...,exp(-j·(N-1)2·π/N)]
P2＝[exp(jπ/4)，exp(jπ/4-j·12·π/M),exp(jπ/4-j·22·π/M),...,exp(jπ/4-j·(M-1)2·π/M)]
and the digital-to-analog conversion module is used for converting the digital domain of the communication and perception integrated chirp multiplexing signal output by the chirp multiplexing module into an analog domain and outputting the communication and perception integrated chirp multiplexing signal of the analog domain. The Keysight company model M8194A may be selected, but is not limited thereto.
And the optical/electric terahertz transmitting end module is used for modulating the communication and perception integrated chirp multiplexing signal of the analog domain output by the digital-to-analog conversion module to a terahertz frequency band in a photon or electronic mode and realizing transmission. The mechanism adopted by the optical/electric terahertz transmitting terminal module comprises the following steps: electronic solid-state frequency doubling chain terahertz modulation, photoelectric heterodyne beat frequency terahertz modulation and photoconductive antenna terahertz modulation. The mechanism adopted by the optical/electric terahertz transmitting end module comprises electronic solid-state frequency doubling chain terahertz modulation, photoelectric heterodyne beat frequency terahertz modulation and photoconductive antenna terahertz modulation. For example, the electronic solid-state frequency doubling chain terahertz modulation is adopted, a communication and perception integrated chirp multiplexing signal in an analog domain is modulated to an intermediate frequency band, and then the signal is modulated to the terahertz frequency band through an electronic frequency doubling mixing diode for emission. And then, taking the photoelectric heterodyne beat frequency terahertz modulation as an example, modulating the communication and perception integrated chirp multiplexing signal of the analog domain to an optical baseband, then coupling the optical baseband with another path of optical carrier, wherein the frequency difference of the two paths of optical signals corresponds to a terahertz frequency band, and the coupled optical signals generate terahertz signals through a photoelectric heterodyne beat frequency mechanism of a photoelectric detector for transmission. The optical/electric terahertz transmitting terminal module can be made of an IOD-PMAM-13001 product of NTT company, but is not limited to the IOD-PMAM-13001 product.
And the optical/electric terahertz receiving end module is used for receiving the communication and perception integrated chirp multiplexing signal of the analog domain to a baseband by a terahertz frequency band in a photon or electronic mode. The mechanism adopted by the optical/electric terahertz receiving end module comprises: the terahertz down-conversion receiving of the electronic solid-state frequency doubling chain and the terahertz receiving of the photoconductive antenna are realized. The optical/electric terahertz receiving end module can be a WR2.2MixAMC model product of VDI company, but is not limited to the model product.
And the analog-to-digital conversion module is used for converting an analog domain of the communication and perception integrated chirp multiplexing signal received by the optical/electric terahertz receiving end module into a digital domain and outputting the digital domain communication and perception integrated chirp multiplexing signal. The analog-to-digital conversion module may be, but is not limited to, a model number DSOZ632A from Keysight corporation.
And the chirp demultiplexing module is used for demultiplexing the digital domain communication and perception integrated chirp multiplexing signal output by the analog-to-digital conversion module, multiplying the digital domain communication and perception integrated chirp multiplexing signal by the orthogonal chirp basis corresponding to the chirp basis modulation module, and outputting a high-order modulation signal. The chirp multiplexing is realized by performing chirp phase inverse transformation after a fast Fourier transform algorithm.The chirp phase inverse transform consists of the multiplication of two chirp phase inverse transform vectors. Assuming that the number of chirp base signals corresponding to the communication and perception integrated chirp multiplexing signal is N and the number of symbols is M, the inverse chirp phase transformation in the implementation of chirp demultiplexing by discrete inverse fresnel transformation is firstly multiplied by an inverse chirp phase transformation vector P in the dimension of each symbol3Then multiplying the chirp phase inverse transformation vector P on the dimension of each chirp base4。P3And P4The mathematical expression of (a) is as follows:
P3＝[exp(-jπ/4)，exp(-jπ/4+j·12·π/M),exp(-jπ/4+j·22·π/M),...,exp(-jπ/4+j·(M-1)2·π/M)]
P4＝[1,exp(j·12·π/N),exp(j·22·π/N),...,exp(j·(N-1)2·π/N)]
the time domain waveform effect diagram of the chirp multiplexing method is shown in fig. 2, the communication sensing signal is multiplied by an orthogonal chirp function to realize chirp-based modulation, and then the chirp multiplexing is realized by a superposition and summation method. The orthogonality of the chirp functions is guaranteed by the fact that the correlation value of any two chirp basis functions is zero.
And the communication signal demodulation module is used for demodulating the high-order modulation signal output by the chirp demultiplexing module into a communication data signal.
And the radar perception processing module is used for calculating radar perception information of the system by utilizing the communication and perception integrated chirp multiplexing signal output by the chirp multiplexing module and the digital domain communication and perception integrated chirp multiplexing signal output by the analog-to-digital conversion module, wherein the radar perception information comprises the distance between a detection target and an optical/electric terahertz transmitting end, the movement speed of the target, and two-dimensional and three-dimensional shape information of the target by utilizing the communication and perception integrated chirp multiplexing signal. The radar processing algorithm adopted by the radar perception processing module includes but is not limited to a time-of-flight algorithm and a range-Doppler algorithm.
Without loss of generality, the chirp-multiplexed terahertz communication perception integrated system represented by the embodiment has the following advantages: the ultra-high-speed terahertz communication and high-precision terahertz sensing are organically integrated, from the viewpoint that the performance requirements of communication sensing are considered by integrated signals, the terahertz communication signals and the sensing signals are integrated into the integrated signals by using a chirp multiplexing mode, a communication sensing integrated system architecture with high integration efficiency is designed, separation among the signals is weakened, and the system has the advantages of high spectrum efficiency, flexibility and configurability and low system cost.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. A chirp multiplexing terahertz communication perception integrated system is characterized by comprising an optical/electric terahertz transmitting end, an optical/electric terahertz receiving end and a radar perception processing module; the optical/electric terahertz transmitting end comprises a communication signal modulation module, a chirp basis modulation module, a chirp multiplexing module, a digital-to-analog conversion module and an optical/electric terahertz transmitting end module which are sequentially connected; the optical/electric terahertz receiving end comprises an optical/electric terahertz receiving end module, an analog-to-digital conversion module, a chirp demultiplexing module and a communication signal demodulation module which are sequentially connected; the radar perception processing module is respectively connected with the output end of the chirp multiplexing module in the optical/electric terahertz transmitting end and the input end of the chirp demultiplexing module in the optical/electric terahertz receiving end module.
The communication signal modulation module is used for modulating the communication data signal to a high-order modulation signal format. According to different communication signal modulation methods, the high-order modulation signal format adopted by the system comprises the following steps: pulse amplitude modulation signals, quadrature amplitude modulation signals, carrierless amplitude phase modulation signals and duobinary signals.
The chirp-based modulation module is used for multiplying the high-order modulation signal output by the communication signal modulation module by a group of orthogonal chirp-based signals, modulating the communication signal corresponding to the high-order modulation signal to a sensing signal corresponding to the group of orthogonal chirp-based signals to form a uniform waveform, realizing communication and sensing integrated chirp-based modulation, and outputting a chirp-based modulated signal; the chirp-based signals are orthogonal chirp signals or orthogonal chirp-like signals, a group of orthogonal chirp-based signals is generated by adopting a kernel function set of Fresnel transformation or a kernel function set of discrete Fresnel transformation, and a correlation value of any two chirp-based signals in the group of orthogonal chirp-based signals is zero.
The chirp multiplexing module is used for superposing chirp-based modulated signals output by the chirp-based modulation module, realizing communication and perception integrated chirp multiplexing of a group of orthogonal chirp signals, and outputting communication and perception integrated chirp multiplexing signals.
The digital-to-analog conversion module is used for converting the digital domain of the communication and perception integrated chirp multiplexing signal output by the chirp multiplexing module into an analog domain and outputting the communication and perception integrated chirp multiplexing signal of the analog domain.
The optical/electric terahertz transmitting end module is used for modulating the communication and perception integrated chirp multiplexing signal of the analog domain output by the digital-to-analog conversion module to a terahertz frequency band and realizing transmission.
The optical/electric terahertz receiving end module is used for receiving the communication and perception integrated chirp multiplexing signal of the analog domain to a baseband through a terahertz frequency band.
The analog-to-digital conversion module is used for converting an analog domain of the communication and perception integrated chirp multiplexing signal received by the optical/electric terahertz receiving end module into a digital domain and outputting the digital domain communication and perception integrated chirp multiplexing signal.
The chirp demultiplexing module is used for demultiplexing the digital domain communication and perception integrated chirp multiplexing signal output by the analog-to-digital conversion module, multiplying the digital domain communication and perception integrated chirp multiplexing signal by the orthogonal chirp basis corresponding to the chirp basis modulation module, and outputting a high-order modulation signal.
The communication signal demodulation module is used for demodulating the high-order modulation signal output by the chirp demultiplexing module into a communication data signal.
The radar perception processing module calculates radar perception information of the system by utilizing the communication signal output by the chirp multiplexing module, the perception integrated chirp multiplexing signal and the digital domain communication and perception integrated chirp multiplexing signal output by the analog-to-digital conversion module.
2. The chirp multiplexing terahertz communication perception integrated system according to claim 1, wherein the high-order modulation signal format adopted by the communication signal modulation module includes: pulse amplitude modulation signal, quadrature amplitude modulation signal, carrierless amplitude phase modulation signal, duobinary signal.
3. The integrated system for terahertz communication perception based on chirp multiplexing according to claim 1, wherein the chirp-based signals of the chirp-based modulation module are orthogonal chirp signals or orthogonal chirp signals, and a correlation value between any two chirp-based signals is zero; wherein j is an imaginary unit (j)2The number of a group of orthogonal chirp-based signals is N, the duration of the signals is T, and the time domain expression mode of the nth chirp-based signal c (T) under fresnel transform is as follows:
4. the integrated system for terahertz communication perception based on chirp multiplexing according to claim 1, wherein the chirp multiplexing module performs chirp phase transformation after using a fast fourier transform algorithm or an inverse fourier transform algorithm; the chirp phase transformation in the realization of communication and perception integrated chirp multiplexing signals is firstly multiplied by a chirp phase transformation vector P on the dimensionality of each chirp basis by using the chirp phase transformation in the realization of chirp phase transformation under discrete Fresnel transformation1Then multiplying each symbol dimension by a chirp phase transformation vector P2。P1And P2The mathematical expression of (a) is as follows:
P1＝[1,exp(-j·12·π/N),exp(-j·22·π/N),...,exp(-j·(N-1)2·π/N)]
P2＝[exp(jπ/4)，exp(jπ/4-j·12·π/M),exp(jπ/4-j·22·π/M),...,exp(jπ/4-j·(M-1)2·π/M)]
5. the chirp multiplexing terahertz communication perception integrated system according to claim 1, wherein the optical/electrical terahertz transmitter module adopts a mechanism including: terahertz modulation of an electronic solid-state frequency doubling chain, photoelectric heterodyne beat frequency terahertz modulation and terahertz modulation of a photoconductive antenna; the terahertz modulation method of the electronic solid-state frequency doubling chain specifically comprises the following steps: the communication and perception integrated chirp multiplexing signal of an analog domain is modulated to an intermediate frequency band, and then the signal is modulated to a terahertz frequency band through an electronic frequency doubling mixing diode for transmission; the photoelectric heterodyne beat frequency terahertz modulation specifically comprises the following steps: the communication and perception integrated chirp multiplexing signal of an analog domain is modulated to an optical baseband and then coupled with another optical carrier, the frequency difference of the two optical signals corresponds to a terahertz frequency band, and the coupled optical signals generate terahertz signals through a photoelectric heterodyne beat frequency mechanism of a photoelectric detector to be transmitted.
6. The chirp multiplexing terahertz communication perception integrated system according to claim 1, wherein the mechanism adopted by the optical/electrical terahertz receiving end module includes: the terahertz down-conversion receiving of the electronic solid-state frequency doubling chain and the terahertz receiving of the photoconductive antenna are realized.
7. The integrated system for terahertz communication perception based on chirp multiplexing according to claim 1, wherein the chirp demultiplexing module performs inverse chirp phase transformation after a fast fourier transform algorithm; the chirp base signal number corresponding to the communication and perception integrated chirp multiplexing signal is N, the symbol number is M, and the chirp phase inverse transformation in the realization of chirp demultiplexing by adopting discrete inverse Fresnel transformation under chirp demultiplexing is firstly multiplied by a chirp phase inverse transformation vector P on the dimensionality of each symbol3Then multiplying the chirp phase inverse transformation vector P on the dimension of each chirp base4。P3And P4The mathematical expression of (a) is as follows:
P3＝[exp(-jπ/4)，exp(-jπ/4+j·12·π/M),exp(-jπ/4+j·22·π/M),...,exp(-jπ/4+j·(M-1)2·π/M)]
P4＝[1,exp(j·12·π/N),exp(j·22·π/N),...,exp(j·(N-1)2·π/N)]
8. the chirp multiplexing terahertz communication perception integrated system according to claim 1, wherein the radar perception processing module adopts a radar processing algorithm, preferably: time-of-flight algorithm, range-doppler algorithm.
9. The chirp-multiplexed terahertz communication perception integrated system according to claim 1, wherein the radar perception information includes a distance between a target and an optical/electrical terahertz transmitting end, a moving speed of the target, and two-dimensional and three-dimensional shape information of the target, which are detected by using the chirp-multiplexed communication and perception integrated system.
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