CN112583493B - A short-distance terahertz communication system and signal transmission and reception method - Google Patents
A short-distance terahertz communication system and signal transmission and reception method Download PDFInfo
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Abstract
本发明公开了一种短距离太赫兹通信系统，短距离太赫兹通信系统包括发送端和接收端，发送端包括：发送控制模块，用于根据GPS或北斗卫星导航系统的授时获取同步时钟，基于同步时钟同时输出16路基带数据至基带处理模块；发送基带处理模块，用于获取16路基带数据通过高速数据处理生成中频信号；发送太赫兹混频器，用于根据预置的本振源和倍振器将中频信号进行二次上变频处理生成2组8路太赫兹信号；发送喇叭天线，用于将2组太赫兹信号向空间传播。本发明还公开了一种短距离太赫兹通信的信号发送、接收方法，从而能够充分利用太赫兹频段连续频谱大带宽的特点实现高速的无线通信。
The invention discloses a short-distance terahertz communication system. The short-distance terahertz communication system includes a sending end and a receiving end, and the sending end includes: a sending control module, which is used to obtain a synchronous clock according to the timing of GPS or Beidou satellite navigation system, based on The synchronous clock simultaneously outputs 16 channels of baseband data to the baseband processing module; the sending baseband processing module is used to obtain 16 channels of baseband data to generate intermediate frequency signals through high-speed data processing; The vibrator double up-converts the intermediate frequency signal to generate 2 groups of 8-channel terahertz signals; the sending horn antenna is used to propagate the 2 groups of terahertz signals into space. The invention also discloses a signal sending and receiving method for short-distance terahertz communication, so that high-speed wireless communication can be realized by making full use of the characteristics of continuous spectrum and large bandwidth of the terahertz frequency band.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a short-distance terahertz communication system and a signal sending and receiving method.
Background
With the rapid development of wireless communication technology and the increasing demand of users for high-capacity and high-rate wireless communication services, it is an important research content to improve the channel capacity and rate of a wireless communication system. And the current mobile communication technology comprises 5G, and the used frequency band is mostly concentrated below 6 GHz. The frequency band spectrum resources below 6GHz are basically distributed, and the frequency band spectrum resources are crowded and tense, and the faced electromagnetic environment is complex and cannot provide continuous large-bandwidth spectrum resources. And in a terahertz frequency band (greater than 100GHz), the frequency spectrum resource is rich, the electromagnetic environment is relatively pure, and the method is suitable for realizing wireless communication with large bandwidth and high speed. According to shannon's theorem, the larger the channel bandwidth is, the larger the capacity of the communication system is under the condition of a certain signal-to-noise ratio.
In a wireless communication system designed in a terahertz frequency band, the maximum bandwidth that can be achieved depends on the working bandwidth of a radio frequency front end circuit, linearity, the bandwidth of a signal that can be processed by an intermediate frequency analog-to-digital converter (ADC/DAC), and the like. However, the transmission rate of the wireless communication system designed in the terahertz frequency band is lower than 500Gbps, and the transmission rate cannot reach the Tbps level.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a short-distance terahertz communication system and a signal sending and receiving method, which can realize high-speed wireless communication by fully utilizing the characteristic of large bandwidth of continuous spectrum of a terahertz frequency band and can realize an air interface transmission rate of at least 1 Tbps.
In order to solve the above technical problem, in a first aspect of the present invention, a short-distance terahertz communication system includes a sending end and a receiving end, where the sending end includes: the transmission control module is used for acquiring a synchronous clock according to the time service of a GPS or Beidou satellite navigation system, and simultaneously outputting 16 baseband data to the baseband processing module based on the synchronous clock; the sending baseband processing module is used for acquiring the 16 baseband data and generating an intermediate frequency signal through high-speed data processing; the sending terahertz frequency mixer is used for carrying out secondary up-conversion processing on the intermediate frequency signal according to a preset local vibration source and a resonator to generate 2 groups of 8-path terahertz signals; and the sending horn antenna is used for transmitting the 2 groups of terahertz signals to space.
In some embodiments, the baseband processing module comprises: a serial-parallel conversion unit, configured to perform time division, serial-parallel conversion on the 16 baseband data to generate 16 paths of parallel data; the checking unit is used for performing cyclic redundancy check on the 16 paths of parallel data; and the coincidence mapping unit is used for modulating the checked 16 paths of parallel data by adopting 16 paths of quadrature amplitude modulation to generate a digital modulation signal. And the digital-to-analog conversion unit is used for modulating the digital modulation signal.
In some embodiments, a terahertz mixer includes: a local vibration source with the frequency range of 10.8-12.5GHz, a 10-time frequency multiplier and a 6-time frequency converter; carrying out up-conversion processing on the intermediate frequency signal to generate 8 paths of 210GHz-232GHz terahertz signals; and carrying out up-conversion processing on the intermediate frequency signal to generate 8 paths of 130GHz-152GHz terahertz signals.
In some embodiments, the receiving end comprises: the receiving horn antenna is used for receiving the terahertz signal; the receiving terahertz frequency mixer is used for carrying out up-conversion processing on the terahertz signal according to a preset local vibration source and a resonator to generate an intermediate frequency signal; the low-noise amplifier is used for amplifying the intermediate frequency signal to a frequency which can be sampled by the receiving baseband processing module and transmitting the intermediate frequency signal to the receiving baseband processing module; the receiving baseband processing module is used for demodulating the amplified intermediate frequency signal to generate baseband data; and the receiving control module is used for carrying out statistics on the data error rate and the transmission rate of the baseband data to generate a data statistical result and outputting and displaying the data statistical result.
In some embodiments, the receiving horn antenna and the transmitting horn antenna are each single-polarized horn antennas, the receiving horn antenna and the transmitting horn antenna being based on a side lobe suppression arrangement of the horn antennas.
According to a second aspect of the invention, a signal transmission method for short-distance terahertz communication is disclosed, which comprises the following steps: acquiring a synchronous clock according to the time service of a GPS or Beidou satellite navigation system, and simultaneously outputting 16 roadbed data based on the synchronous clock; acquiring the 16 roadbed data, and generating an intermediate frequency signal through high-speed data processing; carrying out secondary up-conversion processing on the intermediate frequency signal through a sending terahertz mixer according to a preset local vibration source and a resonator to generate 2 groups of 8-path terahertz signals; and transmitting the 2 groups of terahertz signals to the space through a sending horn antenna.
In some embodiments, acquiring the 16 baseband data generates an intermediate frequency signal by high speed data processing, including: carrying out time division serial-parallel conversion on the 17 road baseband data to generate 16 paths of parallel data; performing cyclic redundancy check on the 16 paths of parallel data; and modulating the 16 paths of verified parallel data by adopting 16 paths of quadrature amplitude modulation to generate a digital modulation signal. And D/A converting the digital modulation signal to generate an intermediate frequency signal.
In some embodiments, the transmitting feedhorn is a single-polarized feedhorn, the transmitting feedhorn being based on a sidelobe suppression arrangement of the feedhorn.
According to a third aspect of the present invention, a signal receiving method for short-distance terahertz communication is disclosed, the method comprising: receiving terahertz signals through a receiving horn antenna; carrying out up-conversion processing on the terahertz signal according to a preset local vibration source and a resonator to generate an intermediate frequency signal; amplifying the intermediate frequency signal to a frequency which can be sampled by a receiving baseband processing module and transmitting the intermediate frequency signal to the receiving baseband processing module; demodulating the amplified intermediate frequency signal in a receiving baseband processing module to generate baseband data; and carrying out statistics on the data error rate and the transmission rate of the baseband data to generate a data statistical result, and outputting and displaying the data statistical result.
In some embodiments, the receiving feedhorns are single-polarized feedhorns, which are based on a sidelobe suppression arrangement of the feedhorns.
Compared with the prior art, the invention has the beneficial effects that:
the terahertz frequency band high-bandwidth signal transmission method can realize the data transmission rate of the Tbps level in the terahertz frequency band through the terahertz frequency mixer, and fully utilizes the characteristic of the large bandwidth of the terahertz frequency band to realize the large-bandwidth signal transmission. And moreover, the single-polarized horn antenna and the side lobe suppression arrangement based on the horn antenna are adopted, so that the interference between adjacent channels meets the simultaneous independent transceiving requirements of a plurality of links.
Drawings
Fig. 1 is a schematic diagram of a short-distance terahertz communication system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another short-distance terahertz communication system disclosed in the embodiment of the present invention;
fig. 3 is a schematic diagram of another short-distance terahertz communication system disclosed in the embodiment of the present invention;
fig. 4 is a schematic diagram of another short-distance terahertz communication system disclosed in the embodiment of the present invention;
fig. 5 is a schematic diagram of another short-distance terahertz communication system disclosed in the embodiment of the present invention;
fig. 6 is a schematic diagram of another short-distance terahertz communication system disclosed in the embodiment of the present invention;
fig. 7 is a schematic diagram of a short-distance terahertz communication signal transmission method disclosed in the embodiment of the present invention;
fig. 8 is a schematic diagram of a flow of a short-distance terahertz communication signal receiving method disclosed in an embodiment of the present invention;
fig. 9 is a schematic view of a short-distance terahertz communication signal interaction device disclosed in the embodiment of the present invention.
Detailed Description
For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a short-distance terahertz communication system and a signal receiving and sending method, which can realize the data transmission rate of a Tbps level in a terahertz frequency band through a terahertz frequency mixer, and fully utilize the characteristic of large bandwidth of the terahertz frequency band to realize large bandwidth signal transmission. And moreover, the single-polarized horn antenna and the side lobe suppression arrangement based on the horn antenna are adopted, so that the interference between adjacent channels meets the simultaneous independent transceiving requirements of a plurality of links.
Example one
Referring to fig. 1, fig. 1 is a schematic diagram of a short-distance terahertz communication system according to an embodiment of the present invention. As shown in fig. 1, the short-range terahertz communication system includes: a transmitting end 1 and a receiving end 2,
the transmitting end 1 includes: and the sending control module 11 is used for acquiring a synchronous clock according to the time service of the GPS or Beidou satellite navigation system, and simultaneously outputting 16 baseband data to the sending baseband processing module based on the synchronous clock. Wherein, the data source for outputting 16 baseband signals is 16 servers. As shown in fig. 2, the time service of the GPS or beidou satellite navigation system may be obtained through the network time server, and then the network time server provides an accurate synchronous clock for each server and the control computer. That is, under the instruction of the control computer, the transmission control module 11 can output the data of each channel to the transmission baseband processing module 12 at the same time under the synchronous clock beat.
And the sending baseband processing module 12 is used for acquiring 16 baseband data and generating an intermediate frequency signal through high-speed data processing.
The baseband processing module 12 includes:
a serial-to-parallel conversion unit 121, configured to perform time division, serial-to-parallel conversion on the 16 baseband data to generate 16 paths of parallel data.
And the checking unit 122 is used for performing cyclic redundancy check on the 16 paths of parallel data.
And the coincidence mapping unit 123 is configured to modulate the checked 16 paths of parallel data by using 16 paths of quadrature amplitude modulation to generate a digital modulation signal.
A digital-to-analog conversion unit 124 for modulating the digital signal.
Exemplarily, fig. 4 is a schematic diagram of an embodiment of the transmission baseband processing module 12 in a specific application scenario, as shown in fig. 4, an fpga (field Programmable Gate array) in the transmission baseband signal processing is a product of further development based on Programmable devices such as PAL, GAL, and the like. The data information is received from the server end and converted into 16 paths of parallel data after time division and serial-parallel conversion, thereby improving the data processing throughput of the baseband platform.
Furthermore, in order to improve the accuracy of the data, Cyclic Redundancy Check (CRC) is added to the 16 paths of parallel data to check whether the data is erroneous, wherein the channel coding uses LDPC coding and decoding, the LDPC code is a block code, and a check matrix of the LDPC code only contains a small number of non-zero elements, thereby ensuring that both the decoding complexity and the minimum code distance only increase linearly with the code length.
Furthermore, in order to improve the transmission efficiency, the coding and decoding with low time delay and high speed can be realized under the condition of limited FPGA logic resources by using a mode based on probability calculation.
Further, in other preferred embodiments, the data is further passed through a scrambling module, which is used to reduce the probability of a large number of consecutive "0" and "1" sequences appearing in the sequence, increase the randomness of the distribution of the "0" and "1" data, and add interference to the sequence. The modulation mode adopts 16QAM (modulation mode), after grouping, odd number is in-phase path, even number is quadrature path, after level conversion, in-phase path and quadrature path pass through multiplier, multiply with two quadrature carriers respectively and then add up, and then obtain digital modulation signal.
Because the extremely wide signal bandwidth is used as a standard in data transmission, the problems of radio frequency non-ideality, channel high-frequency attenuation, uneven frequency spectrum and the like inevitably exist, and the error rate and the signal-to-noise ratio parameter of a link are seriously influenced, a broadband predistortion algorithm is used, and the transmitting end carries out digital broadband compensation. And adopting a digital baseband adaptive predistortion technology.
Further, the carrier synchronization and the phase noise cause the data phase shift at the same time, and if the phase shift can be corrected, the phase noise can be compensated and suppressed at the same time, and after the received signal at the receiving end is coherently demodulated, the carrier frequency shift remains and the received signal is affected by the phase noise. An interpolation phase estimation modulation method is adopted to solve the phase noise problem, Ga64 is used as a guard interval and a cyclic prefix in a transmitted data block, the main importance is to avoid the interference between blocks, linear convolution is converted into the cyclic prefix, and meanwhile, the guard interval Ga64 plays a great role in carrier synchronization and phase noise compensation suppression. Since the cyclic prefix, that is, the guard interval is added, the data of the length of the tail G of the symbol is added to the head, and the cyclic prefix is formed. The cyclic prefix is utilized to facilitate time synchronization and frequency synchronization. After pilot frequency symbols are added, data is framed, digital up-conversion is carried out after the data passes through a shaping filter by a digital signal processing method, and then intermediate frequency signals are sent out after the data passes through a digital-to-analog converter.
And the sending terahertz mixer 13 is used for performing secondary up-conversion processing on the intermediate frequency signal according to a preset local vibration source and a preset dipole to generate 2 groups of 8-path terahertz signals. Illustratively, the transmitting terahertz mixer 13 includes: a local vibration source 131 with the frequency range of 10.8-12.5GHz, a 10-time frequency multiplier 132 and a 6-time frequency converter 133; the terahertz frequency mixer is used for carrying out up-conversion processing on the intermediate frequency signal to generate 8 paths of 210GHz-232GHz terahertz signals, converting the signals to 110GHz through a local vibration source with the frequency range of 10.8-12.5GHz, and then up-converting the signals with the bandwidth of 20GHz generated by the high-speed analog-to-digital converter to 210GHz-232GHz through the sending terahertz subharmonic frequency mixer. Similarly, a local oscillation source of the intermediate frequency signal generates a 70GHz fundamental frequency carrier after 6 times of frequency multiplication, and then a 20GHz signal generated by the high-speed analog-to-digital converter is up-converted to 130GHz-152GHz through the terahertz subharmonic mixer to be up-converted to generate 8 paths of 130GHz-152GHz terahertz signals.
And the transmitting horn antenna 14 is used for transmitting the 2 groups of terahertz signals to the space.
The receiving end 2 includes: and the receiving horn antenna 21 is used for receiving the terahertz signal. The terahertz horn antenna receives a signal corresponding to the transmitting antenna.
And the receiving terahertz frequency mixer 22 is used for carrying out up-conversion processing on the terahertz signal according to a preset local vibration source and a preset dipole to generate an intermediate frequency signal.
And a low noise amplifier 23 for amplifying the intermediate frequency signal to a frequency which can be sampled by the receiving baseband processing module 24 and transmitting the amplified intermediate frequency signal to the receiving baseband processing module 23. The receive chain adds a Low Noise Amplifier (LNA) to amplify small signals to a level range that can be sampled by a high speed analog to digital converter (ADC) to improve the signal to noise ratio.
And the receiving baseband processing module 24 is configured to demodulate the amplified intermediate frequency signal to generate baseband data. The 16 paths of receiving signals are subjected to baseband demodulation by the FPGA and then transmitted to the receiving control module through the QSFP28 optical/electrical interface.
And the receiving control module 25 is configured to perform statistics on the data error rate and the transmission rate of the baseband data to generate a data statistical result, and output and display the data statistical result. The receiving control module is realized as a server, the server carries out further data processing to recover the original data of the sending end and carries out the related statistical analysis of the data error rate and the transmission rate, and the data statistical result is displayed on a receiving end control computer or the server.
Fig. 5 is a schematic diagram of an embodiment of the receiving baseband processing module 24 in a specific application scenario, as shown in fig. 5, after a received signal is converted into a digital signal by an analog-to-digital converter, the digital signal passes through a FIFO memory, which is a first-in first-out dual-port buffer, and buffers a continuous data stream, so as to facilitate preventing data loss. Then, after digital down-conversion and time synchronization, the cyclic prefix is removed. The frequency offset is generated because the difference between the actual output frequency of the local oscillation source and the ideal frequency makes the frequency of the local oscillation signal unlikely to be completely consistent with the carrier frequency of the input signal. At present, there are various algorithms for frequency offset estimation, such as a phase processing carrier recovery method, and a suitable frequency offset estimation algorithm needs to be selected according to the specific implementation of a radio frequency link and the residual situation of baseband logic resources.
The channel equalization is to eliminate or reduce the inter-symbol interference (ISI) problem caused by wideband communication, and the phase noise suppression module solves the phase noise problem through phase sequence estimation. The 16QAM demodulation can adopt an orthogonal coherent demodulation method, and a received signal enters a decision device to be decided after passing through a coherent demodulator with orthogonal carrier waves, so as to output the signal. And finally, descrambling and decoding the LDPC channel to obtain data information.
As shown in fig. 6, the receiving horn antenna 21 and the transmitting horn antenna 14 are single-polarized horn antennas, and the receiving horn antenna and the transmitting horn antenna are arranged based on side lobe suppression of the horn antennas. The interference between channels reaches the requirement of < -30 dB. The function of independent transceiving of each co-channel is met under the condition that the interference between adjacent channels is less than-30 dB, and therefore the adopted single-polarized horn antenna and the sidelobe suppression arrangement based on the horn antenna enable the interference between the adjacent channels to meet the requirement of simultaneous independent transceiving of 16 links, and the purposes of increasing the channel capacity and improving the communication rate are achieved.
The short-distance terahertz system can achieve a communication rate of 1Tbps, the transceiving link has 16 channels, each channel has a rate of 64Gbps, the total 16 × 64Gbps is 1.024Tbps, and the communication distance is about 0.5 m. Each link adopts a 16QAM modulation mode, the symbol rate Rs is 16GSPS, a forming filter with alpha being 0.35 is used, and the bandwidth of each baseband signal is as follows: b ═ 1+ α × Rs/2 ═ 1.35 × 8 ═ 10.8GHz, radio frequency signal bandwidth: BW 2 × B21.6 GHz. Thus, the sampling rate of each ADC/DAC is required to be greater than 44 GSPS. Therefore, 16 paths of large-bandwidth signals can be independently received or sent, large-bandwidth signal transmission is achieved in the terahertz frequency band, data transmission rate of the Tbps level is achieved, and air interface transmission rate of more than 1Tbps can be achieved through the short-distance terahertz communication system.
According to the system provided by the embodiment, the data transmission rate of the Tbps level can be realized in the terahertz frequency band through the terahertz frequency mixer, and the large-bandwidth signal transmission is realized by fully utilizing the large-bandwidth characteristic of the terahertz frequency band. And moreover, the single-polarized horn antenna and the side lobe suppression arrangement based on the horn antenna are adopted, so that the interference between adjacent channels meets the simultaneous independent transceiving requirements of a plurality of links.
Example two
Referring to fig. 7, fig. 7 is a schematic flow chart of a method for transmitting a short-distance terahertz communication signal according to an embodiment of the present invention. As shown in fig. 7, the short-range terahertz communication signal transmission method includes:
101. and acquiring a synchronous clock according to the time service of the GPS or Beidou satellite navigation system, and simultaneously outputting 16 roadbed data based on the synchronous clock.
Wherein, the data source for outputting 16 baseband signals is 16 servers. As shown in fig. 2, the time service of the GPS or beidou satellite navigation system may be obtained through the network time server, and then the network time server provides an accurate synchronous clock for each server and the control computer.
102. And acquiring 16 roadbed band data, and generating an intermediate frequency signal through high-speed data processing.
The concrete implementation is as follows: carrying out time division serial-parallel conversion on 17 road base band data to generate 16 paths of parallel data; and performing cyclic redundancy check on the 16 paths of parallel data. And modulating the 16 paths of verified parallel data by adopting 16 paths of quadrature amplitude modulation to generate a digital modulation signal. And D/A converting the digital modulation signal to generate an intermediate frequency signal.
As a specific implementation, fpga (field Programmable Gate array) in the processing of transmitting baseband signals is a product of further development on the basis of Programmable devices such as PAL, GAL, etc. The data information is received from the server end and converted into 16 paths of parallel data after time division and serial-parallel conversion, thereby improving the data processing throughput of the baseband platform.
Furthermore, in order to improve the accuracy of the data, Cyclic Redundancy Check (CRC) is added to the 16 paths of parallel data to check whether the data is erroneous, wherein the channel coding uses LDPC coding and decoding, the LDPC code is a block code, and a check matrix of the LDPC code only contains a small number of non-zero elements, thereby ensuring that both the decoding complexity and the minimum code distance only increase linearly with the code length.
Furthermore, in order to improve the transmission efficiency, the coding and decoding with low time delay and high speed can be realized under the condition of limited FPGA logic resources by using a mode based on probability calculation.
Further, in other preferred embodiments, the data is further passed through a scrambling module, which is used to reduce the probability of a large number of consecutive "0" and "1" sequences appearing in the sequence, increase the randomness of the distribution of the "0" and "1" data, and add interference to the sequence. The modulation mode adopts 16QAM (modulation mode), after grouping, odd number is in-phase path, even number is quadrature path, after level conversion, in-phase path and quadrature path pass through multiplier, multiply with two quadrature carriers respectively and then add up, and then obtain digital modulation signal.
Because the extremely wide signal bandwidth is used as a standard in data transmission, the problems of radio frequency non-ideality, channel high-frequency attenuation, uneven frequency spectrum and the like inevitably exist, and the error rate and the signal-to-noise ratio parameter of a link are seriously influenced, a broadband predistortion algorithm is used, and the transmitting end carries out digital broadband compensation. And adopting a digital baseband adaptive predistortion technology.
Further, the carrier synchronization and the phase noise cause the data phase shift at the same time, and if the phase shift can be corrected, the phase noise can be compensated and suppressed at the same time, and after the received signal at the receiving end is coherently demodulated, the carrier frequency shift remains and the received signal is affected by the phase noise. An interpolation phase estimation modulation method is adopted to solve the phase noise problem, Ga64 is used as a guard interval and a cyclic prefix in a transmitted data block, the main importance is to avoid the interference between blocks, linear convolution is converted into the cyclic prefix, and meanwhile, the guard interval Ga64 plays a great role in carrier synchronization and phase noise compensation suppression. Since the cyclic prefix, that is, the guard interval is added, the data of the length of the tail G of the symbol is added to the head, and the cyclic prefix is formed. The cyclic prefix is utilized to facilitate time synchronization and frequency synchronization. After pilot frequency symbols are added, data is framed, digital up-conversion is carried out after the data passes through a shaping filter by a digital signal processing method, and then intermediate frequency signals are sent out after the data passes through a digital-to-analog converter.
103. And carrying out secondary up-conversion processing on the intermediate frequency signal through a sending terahertz mixer according to a preset local vibration source and a resonator to generate 2 groups of 8-path terahertz signals.
Illustratively, the transmitting terahertz mixer 13 includes:
a local vibration source 131 with the frequency range of 10.8-12.5GHz, a 10-time frequency multiplier 132 and a 6-time frequency converter 133; the terahertz frequency mixer is used for carrying out up-conversion processing on the intermediate frequency signal to generate 8 paths of 210GHz-232GHz terahertz signals, converting the signals to 110GHz through a local vibration source with the frequency range of 10.8-12.5GHz, and then up-converting the signals with the bandwidth of 20GHz generated by the high-speed analog-to-digital converter to 210GHz-232GHz through the sending terahertz subharmonic frequency mixer. Similarly, a local oscillation source of the intermediate frequency signal generates a 70GHz fundamental frequency carrier after 6 times of frequency multiplication, and then a 20GHz signal generated by the high-speed analog-to-digital converter is up-converted to 130GHz-152GHz through the terahertz subharmonic mixer to be up-converted to generate 8 paths of 130GHz-152GHz terahertz signals.
104. The 2 groups of terahertz signals are propagated to the space through the sending horn antenna.
The sending horn antenna is a single-polarized horn antenna and is arranged based on side lobe suppression of the horn antenna. The interference between channels reaches the requirement of < -30 dB. The function of independent transceiving of each same-frequency channel is met under the condition that the interference between adjacent channels is less than-30 dB, and the purposes of increasing the channel capacity and improving the communication rate are achieved.
According to the method provided by the embodiment, the data transmission rate of the Tbps level can be realized in the terahertz frequency band through the terahertz frequency mixer, and the large-bandwidth signal transmission is realized by fully utilizing the large-bandwidth characteristic of the terahertz frequency band. And moreover, the single-polarized horn antenna and the side lobe suppression arrangement based on the horn antenna are adopted, so that the interference between adjacent channels meets the simultaneous independent transceiving requirements of a plurality of links.
EXAMPLE III
Referring to fig. 8, fig. 8 is a schematic flow chart of a method for receiving a short-distance terahertz communication signal according to an embodiment of the present invention. As shown in fig. 8, the short-range terahertz communication signal receiving method includes:
201. and receiving the terahertz signal through a receiving horn antenna.
The terahertz horn antenna receives a signal corresponding to the transmitting antenna.
202. Carrying out up-conversion processing on the terahertz signal according to a preset local vibration source and a resonator to generate an intermediate frequency signal;
203. and amplifying the intermediate frequency signal to a frequency which can be sampled by the receiving baseband processing module and transmitting the intermediate frequency signal to the receiving baseband processing module.
204. And demodulating the amplified intermediate frequency signal in a receiving baseband processing module to generate baseband data.
Specifically, after the received signal is converted into a digital signal by the analog-to-digital converter, the digital signal passes through the FIFO memory, which is a first-in first-out double-port buffer, and buffers a continuous data stream, thereby being beneficial to preventing data loss. Then, after digital down-conversion and time synchronization, the cyclic prefix is removed. The frequency offset is generated because the difference between the actual output frequency of the local oscillation source and the ideal frequency makes the frequency of the local oscillation signal unlikely to be completely consistent with the carrier frequency of the input signal. At present, there are various algorithms for frequency offset estimation, such as a phase processing carrier recovery method, and a suitable frequency offset estimation algorithm needs to be selected according to the specific implementation of a radio frequency link and the residual situation of baseband logic resources.
The channel equalization is to eliminate or reduce the inter-symbol interference (ISI) problem caused by wideband communication, and the phase noise suppression module solves the phase noise problem through phase sequence estimation. The 16QAM demodulation can adopt an orthogonal coherent demodulation method, and a received signal enters a decision device to be decided after passing through a coherent demodulator with orthogonal carrier waves, so as to output the signal. And finally, descrambling and decoding the LDPC channel to obtain data information. Moreover, each radio frequency link can realize frequency conversion and signal sampling of 21.6GHz bandwidth signals.
205. And carrying out statistics on the data error rate and the transmission rate of the baseband data to generate a data statistical result, and outputting and displaying the data statistical result.
The receiving horn antenna is a single-polarized horn antenna and is arranged based on side lobe suppression of the horn antenna. The interference between channels reaches the requirement of < -30 dB. The function of independent transceiving of each same-frequency channel is met under the condition that the interference between adjacent channels is less than-30 dB, and the purposes of increasing the channel capacity and improving the communication rate are achieved.
According to the method provided by the embodiment, the data transmission rate of the Tbps level can be realized in the terahertz frequency band through the terahertz frequency mixer, and the large-bandwidth signal transmission is realized by fully utilizing the large-bandwidth characteristic of the terahertz frequency band. And moreover, the single-polarized horn antenna and the side lobe suppression arrangement based on the horn antenna are adopted, so that the interference between adjacent channels meets the simultaneous independent transceiving requirements of a plurality of links.
Example four
Referring to fig. 9, fig. 9 is a schematic structural diagram of a short-distance terahertz communication device according to an embodiment of the present invention. As shown in fig. 9, the apparatus may include:
a memory 301 storing executable program code;
a processor 302 coupled to the memory 301;
the processor 302 calls the executable program code stored in the memory 301 for executing the short-range terahertz communication method described in embodiment two or embodiment three.
EXAMPLE five
An embodiment of the present invention discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program causes a computer to execute the short-distance terahertz communication method described in the second embodiment or the third embodiment.
EXAMPLE six
An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute the short-range terahertz communication method described in embodiment two or embodiment three.
The above-described embodiments are only illustrative, and the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above detailed description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on such understanding, the above technical solutions may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, where the storage medium includes a Read-Only Memory (ROM), a Random Access Memory (RAM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc-Read-Only Memory (CD-ROM), or other disk memories, CD-ROMs, or other magnetic disks, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
Finally, it should be noted that: the short-distance terahertz communication system and the signal sending and receiving method thereof disclosed by the embodiment of the invention are only the preferred embodiment of the invention, and are only used for illustrating the technical scheme of the invention, but not limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
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| CN113346960B (en) * | 2021-08-05 | 2021-11-09 | 北京理工大学 | Method and system for synthesizing and calibrating terahertz space quadrature modulation signals |
| CN113890629B (en) * | 2021-10-20 | 2023-03-24 | 网络通信与安全紫金山实验室 | Terahertz signal receiving device and method and signal transmission system |
| CN114123979B (en) * | 2022-01-25 | 2022-05-03 | 电子科技大学 | Terahertz full-duplex common local oscillator solid-state front-end transmitting circuit |
| CN114465857B (en) * | 2022-03-11 | 2024-03-08 | 大连大学 | THz communication method suitable for severe sea conditions |
| CN114826863B (en) * | 2022-04-22 | 2023-07-04 | 四川轻化工大学 | Terahertz communication method, sending end, receiving end and system |
| CN115941416B (en) * | 2022-11-07 | 2024-05-07 | 四川工商学院 | Tracking and receiving control device based on time synchronization |
| CN115982571B (en) * | 2023-01-12 | 2023-07-25 | 中国人民解放军军事科学院系统工程研究院 | Geometric representation method and device for space terahertz communication signals |
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| CN108092929A (en) * | 2017-12-27 | 2018-05-29 | 北京理工大学 | A kind of synchronous method for Terahertz communication |
| CN110611529A (en) * | 2019-09-20 | 2019-12-24 | 上海无线电设备研究所 | System for realizing integration of terahertz tracking and data relay communication |
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| CN108055226B (en) * | 2017-12-27 | 2020-06-16 | 北京理工大学 | A Pseudocode-Assisted Synchronization Method for Terahertz Communication |
| CN108667531A (en) * | 2018-04-18 | 2018-10-16 | 姚远 | Terahertz wireless signal sending device, reception device, communication system and method |
| US10523182B1 (en) * | 2018-08-22 | 2019-12-31 | Rockwell Collins, Inc. | Adaptive harmonic cancellation |
| CN109981135B (en) * | 2019-04-23 | 2024-08-06 | 四川众为创通科技有限公司 | Terahertz simultaneous transceiving full-duplex multi-carrier communication system |
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| CN110611529A (en) * | 2019-09-20 | 2019-12-24 | 上海无线电设备研究所 | System for realizing integration of terahertz tracking and data relay communication |
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