CN114826863B - Terahertz communication method, sending end, receiving end and system - Google Patents
Terahertz communication method, sending end, receiving end and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/90—Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a terahertz communication method, a sending end, a receiving end and a system, wherein the method comprises the steps of obtaining binary communication data, dividing the binary communication data to obtain two paths of parallel binary sequences; converting the binary sequence into a target binary sequence; modulating the target system sequence by using two carriers with the same frequency and a primary phase difference pi/2 respectively to obtain two paths of orthogonal signals, and performing mixed superposition processing on the two paths of orthogonal signals to obtain mixed signals; based on the binary sequence, determining a frequency multiplication value of the frequency multiplier for the preset carrier wave, and multiplying the frequency of the preset carrier wave according to the frequency multiplication value to obtain a frequency multiplication signal; and mixing the frequency multiplication signal with the mixed signal to obtain an output signal, and transmitting the output signal through a transmitting antenna. The invention realizes signal sampling judgment to reduce the error rate by adding the frequency parameters into the QAM modulation to participate in the modulation together, thereby improving the transmission efficiency.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a terahertz communication method, a sending end, a receiving end, and a system.
Background
With the rapid development of wireless communication technology, the demands of users for high-rate wireless communication resources are increasing, but the frequency bands which can be used by each user are fewer due to the limited frequency spectrum resources, so that the frequency spectrum resources terahertz (THz) frequency band which is not developed and utilized yet needs to be developed, and the characteristics of abundant frequency spectrum resources, good electromagnetic environment, large bandwidth and high rate are achieved. Therefore, increasing noise margin and reducing the effect of noise on wireless communication systems has become an important research content.
QAM modulation is a commonly used communication signal modulation mode at present, and can use multiplexing technology to mix two paths of signals for transmission together, so that the transmission rate and the frequency band utilization rate are improved, QAM is to use phase and amplitude common modulation, but certain error code condition can occur when sampling judgment is transmitted under the high noise condition.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a terahertz communication method, a sending end, a receiving end and a system, and aims to solve the technical problems of small noise margin and low transmission efficiency of the existing terahertz communication.
In order to achieve the above object, the present invention provides a terahertz communication method, which is used for a transmitting end, and includes:
binary communication data are acquired, and the binary communication data are segmented to obtain two paths of parallel binary sequences;
converting the binary sequence into a target binary sequence;
modulating a target system sequence by using two carriers with the same frequency and a primary phase difference pi/2 respectively to obtain two paths of orthogonal signals, and performing mixed superposition processing on the two paths of orthogonal signals to obtain a mixed signal;
determining a frequency multiplication value of a frequency multiplier to a preset carrier wave based on the binary sequence, and multiplying the frequency of the preset carrier wave according to the frequency multiplication value to obtain a frequency multiplication signal;
and carrying out frequency mixing processing on the frequency multiplication signal and the mixed signal to obtain an output signal, and transmitting the output signal through a transmitting antenna.
Optionally, the modulation adopts QAM modulation, and the target binary sequence is a sequence corresponding to the QAM modulation.
Optionally, the determining, based on the binary sequence, a frequency multiplication value of the frequency multiplier to the preset carrier includes:
performing exclusive or processing on the two paths of parallel binary sequences to obtain binary processing data;
judging the high-low level corresponding to the binary processing data according to the parity of the numerical value in the binary processing data;
and based on the high and low levels, matching the carrier frequency mapped by the binary processing data to determine the frequency multiplication value of the frequency multiplier to the preset carrier.
Optionally, if the number of the values 1 in the binary processing data is an odd number, determining that the frequency multiplication value of the frequency multiplier to the preset carrier is 0; if the number of the numerical values 1 in the binary processing data is even, determining that the frequency multiplication value of the frequency multiplier to the preset carrier is 1.
In addition, in order to achieve the above object, the present invention further provides a terahertz communication method, which is used for a receiving end, and includes:
mixing the received input signal with the frequency multiplication signal to obtain a baseband signal;
performing level extraction and judgment processing on the baseband signal to enable the baseband signal to discretize the amplitude according to a preset sampling frequency, and performing zero-rounding quantization processing on the amplitude to obtain two paths of target binary sequences;
converting the target binary sequence into a binary sequence;
the two binary sequences are combined into baseband binary data.
Optionally, before the mixing processing is performed on the received input signal and the frequency multiplication signal to obtain the baseband signal, the method further includes: upon receiving an input signal, the input signal is processed with a low noise amplifier to low noise amplify the input signal.
Optionally, the mixing processing is performed on the received input signal and the frequency multiplication signal to obtain a baseband signal, which specifically includes:
obtaining demodulation mixing frequency of an input signal, and mixing the same-frequency pre-high-frequency carrier wave with the input signal to obtain a baseband mixing signal;
and processing the baseband mixed signal by using a low-pass filter to obtain a baseband signal.
In addition, in order to achieve the above object, the present invention further provides a terahertz communication transmitting end, including:
the serial-parallel conversion module is used for obtaining binary communication data, dividing the binary communication data and obtaining two paths of parallel binary sequences;
the level conversion module is used for converting the binary sequence into a target binary sequence;
the signal superposition module is used for respectively modulating the target system sequence by utilizing two carriers with the same frequency and the primary phase difference pi/2 to obtain two paths of orthogonal signals, and carrying out mixed superposition processing on the two paths of orthogonal signals to obtain mixed signals;
the frequency multiplication selection module is used for determining a frequency multiplication value of a frequency multiplier to a preset carrier wave based on the binary sequence, and carrying out frequency multiplication on the preset carrier wave according to the frequency multiplication value to obtain a frequency multiplication signal;
and the signal transmission processing module is used for carrying out frequency mixing processing on the frequency multiplication signal and the mixed signal to obtain an output signal, and transmitting the output signal through a transmitting antenna.
In addition, in order to achieve the above object, the present invention further provides a terahertz communication receiving end, including:
the signal receiving and processing module is used for carrying out frequency mixing processing on the received input signal and the frequency multiplication signal to obtain a baseband signal;
the level judgment module is used for carrying out level extraction and judgment processing on the baseband signal so as to enable the baseband signal to discretize the amplitude according to a preset sampling frequency, and carrying out quantization processing of zero-cutting and rounding on the amplitude to obtain two paths of target system sequences;
the level conversion module is used for converting the target binary sequence into a binary sequence;
and the serial-parallel conversion module is used for combining the two paths of binary sequences into baseband binary data.
In addition, in order to achieve the above object, the present invention also provides a terahertz communication system, including:
the terahertz communication transmitting end is as described above; and
the terahertz communication receiving end is as described above.
The invention provides a terahertz communication method, a sending end, a receiving end and a system, wherein the method comprises the steps of obtaining binary communication data, dividing the binary communication data, and obtaining two paths of parallel binary sequences; converting the binary sequence into a target binary sequence; modulating the target system sequence by using two carriers with the same frequency and a primary phase difference pi/2 respectively to obtain two paths of orthogonal signals, and performing mixed superposition processing on the two paths of orthogonal signals to obtain mixed signals; based on the binary sequence, determining a frequency multiplication value of the frequency multiplier for the preset carrier wave, and multiplying the frequency of the preset carrier wave according to the frequency multiplication value to obtain a frequency multiplication signal; and mixing the frequency multiplication signal with the mixed signal to obtain an output signal, and transmitting the output signal through a transmitting antenna. The invention realizes signal sampling judgment to reduce the error rate by adding the frequency parameters into the QAM modulation to participate in the modulation together, improves the transmission efficiency, improves the noise margin of a communication system when transmitting the same amount of data, reduces the error rate by about 50 percent, and compensates the signal-to-noise ratio threshold in the terahertz high-frequency transmission process in a terahertz wireless communication system.
Drawings
FIG. 1 is a schematic flow chart of a terahertz communication method according to an embodiment of the invention;
fig. 2 is a schematic diagram of a terahertz communication transmitting end in an embodiment of the invention;
FIG. 3 is a schematic diagram of the structure of an exclusive OR processing module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a signal sending processing module in an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a terahertz communication method according to an embodiment of the invention;
fig. 6 is a schematic diagram of a terahertz communication receiving end in an embodiment of the invention;
fig. 7 is a schematic diagram of a signal receiving and processing module according to an embodiment of the invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The technical solutions of 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 apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, based on the embodiments of the invention, which would be apparent to one of ordinary skill in the art without inventive effort are within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicators are changed accordingly.
In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary that the technical solutions are based on the fact that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the technical solutions should be considered that the combination does not exist and is not within the scope of protection claimed by the invention.
With the rapid development of wireless communication technology, the demands of users for high-rate wireless communication resources are increasing, but the frequency bands which can be used by each user are fewer due to the limited frequency spectrum resources, so that the frequency spectrum resources terahertz (THz) frequency band which is not developed and utilized yet needs to be developed, and the characteristics of abundant frequency spectrum resources, good electromagnetic environment, large bandwidth and high rate are achieved. Therefore, increasing noise margin and reducing the effect of noise on wireless communication systems has become an important research content.
QAM modulation is a commonly used communication signal modulation mode at present, and can use multiplexing technology to mix two paths of signals for transmission together, so that the transmission rate and the frequency band utilization rate are improved, QAM is to use phase and amplitude common modulation, but certain error code condition can occur when sampling judgment is transmitted under the high noise condition.
To solve this problem, various embodiments of the terahertz communication method of the present invention are proposed. According to the terahertz communication method provided by the invention, the frequency parameters are added into the QAM modulation to participate in the modulation together so as to realize signal sampling judgment, reduce the error rate, improve the transmission efficiency, improve the noise margin of a communication system when the same amount of data is transmitted, reduce the error rate by about 50%, and compensate the signal-to-noise ratio threshold in the terahertz high-frequency transmission process in the terahertz wireless communication system.
Referring to fig. 1, fig. 1 is a schematic flow chart of a terahertz communication method according to an embodiment of the invention.
The embodiment provides a terahertz communication method, which is used for a transmitting end and comprises the following steps:
step S100, binary communication data are acquired, and the binary communication data are divided to obtain two paths of parallel binary sequences.
Specifically, when binary communication data is acquired, the baseband binary data is divided into two parallel binary sequences to realize serial-parallel conversion.
Step S200, converting the binary sequence into a target binary sequence.
Specifically, the target binary sequence is a sequence corresponding to a binary sequence when modulation is performed later.
And step S300, respectively modulating the target system sequence by utilizing two carriers with the same frequency and the initial phase difference pi/2 to obtain two paths of orthogonal signals, and carrying out mixed superposition processing on the two paths of orthogonal signals to obtain a mixed signal.
Specifically, the modulation adopts QAM modulation, and the target system sequence is a system sequence corresponding to the QAM modulation.
Step S400, based on the binary sequence, determining a frequency multiplication value of the frequency multiplier to the preset carrier wave, and multiplying the frequency of the preset carrier wave according to the frequency multiplication value to obtain a frequency multiplication signal.
Specifically, when the frequency multiplier is determined to multiply the frequency value of the preset carrier wave, performing exclusive or processing on two paths of parallel binary sequences to obtain binary processing data; judging the high-low level corresponding to the binary processing data according to the parity of the numerical value in the binary processing data; and based on the high and low levels, matching the carrier frequency mapped by the binary processing data to determine the frequency multiplication value of the frequency multiplier to the preset carrier.
If the number of the numerical values 1 in the binary processing data is an odd number, determining that the frequency multiplication value of the frequency multiplier to the preset carrier is 0; if the number of the numerical values 1 in the binary processing data is even, determining that the frequency multiplication value of the frequency multiplier to the preset carrier is 1.
Step S500, the frequency multiplication signal and the mixed signal are subjected to frequency mixing processing to obtain an output signal, and the output signal is transmitted through a transmitting antenna.
Specifically, during mixing, the mixed signal and the frequency multiplication signal as the carrier signal are subjected to frequency mixing and frequency multiplication processing, and finally, a wideband signal is directionally transmitted into space through the horizontally polarized horn antenna.
In another embodiment, a terahertz communication transmitter is provided, which includes a serial-to-parallel conversion module, an exclusive-or processing module, a level conversion module, and a signal transmission processing module.
The serial-parallel conversion module is used for dividing the baseband binary data into two paths of parallel binary sequences; the exclusive OR processing module is used for judging the position of the constellation diagram to which the signal belongs and selecting a corresponding frequency multiplier for processing; the level conversion module is used for converting the binary sequence into a binary number of a QAM (quadrature amplitude modulation) order; the signal superposition module is used for respectively modulating two paths of digital signals by two carriers with the same frequency and the initial phase difference pi/2 to form orthogonal signals, and mixing, superposing and transmitting the obtained two paths of signals; and the signal transmission processing module is used for carrying out frequency mixing and frequency multiplication processing on the mixed signal and the carrier signal, and finally, directionally transmitting the broadband signal into space through the horizontal polarization horn antenna.
It should be noted that the exclusive or processing module includes: the exclusive OR gate unit is used for carrying out exclusive OR processing on a group of binary data of two paths to obtain new binary data; the parity level conversion unit is used for judging the parity of the number of the new binary data 1 and respectively corresponding to the high level and the low level; and the frequency multiplication mapping unit is used for mapping the carrier frequencies of the high and low levels and aims at whether the signal is subjected to frequency mixing up-conversion processing or not.
The signal superposition module comprises: a set of two baseband signals (ASK modulated) are transmitted according to a preset high frequency carrier and up-converted. The high-frequency carrier directly modulates one path of baseband signal, and the high-frequency carrier is shifted by pi/2 to form a quadrature carrier to modulate the other path of baseband signal. And mixing the two paths of signals to obtain an electromagnetic wave analog signal.
The signal transmission processing module includes: a signal input unit for receiving the electromagnetic wave analog signal and the prefabricated high-frequency carrier signal; a synchronous clock unit for recording each signal up-conversion condition for the purpose of demodulating the clock cycle; and the up-conversion unit is used for processing whether the analog signal is mixed with the pre-high-frequency carrier according to the frequency multiplication mapping unit.
In addition, the transmitting horn is a horizontally polarized horn that is arranged based on sidelobe suppression of the horn.
In order to facilitate understanding, the embodiment proposes a specific example of a terahertz communication transmitting end, which is specifically as follows:
as shown in fig. 2, the terahertz communication transmitting end includes: the device comprises a serial-parallel conversion module, a level conversion module, a signal superposition module, an exclusive OR processing module, a signal transmission processing module and a transmission horn antenna.
Serial-parallel conversion module: for splitting a set of binary data into two parallel paths of data. As shown in fig. 3, the exclusive-or processing module includes: an exclusive OR gate unit, a parity level conversion unit and a frequency multiplication mapping unit. The two paths of parallel binary data enter exclusive OR processing to obtain new binary data, and the number parity of the new data 1 is judged, so that the group of binary data is divided into two types and used for selecting frequency multipliers, namely an odd-numbered selection frequency multiplier multiplied by 1 and an even-numbered selection frequency multiplier multiplied by 0.
Taking 16QAM modulation as an example, 4-bit binary data is modulated at a time, and each path has 2-bit binary data. The adjacent 4 groups of binary numbers at the constellation positions corresponding to the data 1100 are 0100, 1000, 1110 and 1101 respectively, the exclusive-or processing result of the data 1100 is 10ζ00, the exclusive-or processing result of the adjacent binary numbers is 00ζ10=10, 10ζ00=10, 11ζ10=01 and 10ζ11=01 respectively, and the number of the four groups 1 is odd and opposite to the 1100 result, which can well distinguish the data 1100 from the adjacent four groups of data.
And the level conversion module is used for converting the two paths of binary sequences into binary numbers with QAM (quadrature amplitude modulation) orders, wherein the binary numbers are g1 (t) and g2 (t) respectively.
The signal superposition module is used for modulating two paths of digital signals by two carriers with the same frequency and initial phase difference pi/2 respectively to form orthogonal signals, mixing, superposing and transmitting the obtained two paths of signals, and converting digital signals g1 (t) and g2 (t) into an analog signal m (t) =g1 (t) coswt+g2 (t) sinwt.
And the signal transmission processing module is used for carrying out corresponding frequency mixing and multiplication processing on the mixed signal and the preset carrier signal to obtain a final transmission analog signal. As shown in fig. 4, the input end 1 of the signal sending processing module is for receiving the two paths of mixed superimposed signals, and the input end 2 of the signal sending processing module is for inputting the result after the exclusive or processing module. The exclusive or result of each successive set of baseband signals will be recorded with a synchronous clock device.
The carrier wave source is preset as a local oscillator of the mixer, and whether to perform frequency mixing up-conversion processing and sending is selected according to the exclusive OR result of the group of signals. For example, the exclusive-or processing result of the binary data 1100 is even, the frequency multiplier x 0 is selected, the purpose of which is to directly transmit the input superimposed signal through the horizontal polarization loudspeaker, the up-conversion processing is not performed to form the intermediate frequency signal transmission, and 4 sets of binary data adjacent to the intermediate frequency signal transmission are all transmitted through the frequency multiplier x 1 mixing processing.
The transmitting horns are all horizontally polarized horns for directional transmission, and the transmitting horns are arranged based on sidelobe suppression of the horns.
Referring to fig. 5, fig. 5 is a schematic flow chart of a terahertz communication method according to an embodiment of the invention.
The embodiment provides a terahertz communication method, which is used for a receiving end and comprises the following steps:
step S600, the received input signal and the frequency multiplication signal are mixed to obtain a baseband signal.
Specifically, before the received input signal is mixed with the frequency-multiplied signal to obtain the baseband signal, the method further includes: upon receiving an input signal, the input signal is processed with a low noise amplifier to low noise amplify the input signal.
As can be easily understood, when the baseband signal is obtained, the demodulation mixing frequency of the input signal is obtained, and the same-frequency pre-high-frequency carrier wave is mixed with the input signal to obtain the baseband mixing signal; and processing the baseband mixed signal by using a low-pass filter to obtain a baseband signal.
And step S700, performing level extraction and judgment processing on the baseband signal so as to enable the baseband signal to discretize the amplitude according to a preset sampling frequency, and performing zero-rounding quantization processing on the amplitude to obtain two paths of target binary sequences.
Specifically, during the extraction and interpretation processing, the amplitude, the phase and the transmission frequency can be respectively determined according to the two paths, so as to obtain the final two paths of target system sequences.
Step S800, converting the target binary sequence into a binary sequence.
Specifically, the target binary sequence is a binary number corresponding to the QAM modulation order, and the binary number of the QAM modulation order is further converted into a binary sequence.
In step S900, the two binary sequences are combined into baseband binary data.
Specifically, two parallel binary sequences are combined into one piece of baseband binary data.
In another embodiment, there is provided a terahertz communication receiving end including: the device comprises a receiving horn antenna, a signal receiving processing module, a level judging module, a level converting module and a serial-parallel conversion module.
The receiving horn antenna is used for receiving weak terahertz signals in a low-directional mode through the frequency bandwidth and the side lobes; the signal receiving and processing module is used for amplifying the terahertz signal, performing up-conversion processing and generating a baseband signal through a filter; the level judgment module is used for carrying out level extraction and judgment processing on the baseband signal, and judging the amplitude, the phase and the transmission frequency according to two paths respectively; the level conversion module is used for converting the binary number of the QAM modulation order into a binary sequence; and the serial-parallel conversion module is used for combining the two paths of parallel binary sequences into one piece of baseband binary data.
It should be noted that the signal receiving and processing module includes: the low-noise amplifier is used for reducing weak terahertz signals which need to be received for noise amplification because of large terahertz signal propagation attenuation; the synchronous clock unit is used for judging the demodulation mixing frequency of each group of signals; the up-conversion unit is used for carrying out frequency mixing processing on the same-frequency pre-high-frequency carrier wave and the received modulation signal and separating high-frequency signals and low-frequency signals; a low pass filter for filtering the high frequency signal, leaving a desired baseband signal.
The level decision module comprises: a decision threshold is calculated and set to a certain threshold value, so that the error rate is reduced; and level sampling quantization, namely discretizing the amplitude of the baseband signal according to a certain sampling frequency, and carrying out zero-cutting rounding quantization on the amplitude.
In order to facilitate understanding, the embodiment proposes a specific example of a terahertz communication receiving end, which is specifically as follows:
as shown in fig. 6, the terahertz communication receiving end includes a receiving horn antenna, a signal receiving processing module, a level decision module, a level conversion module and a serial-parallel conversion module.
And the receiving horn antenna is used for receiving the weak terahertz signals in a low-directional mode through the frequency bandwidth and the side lobes and receiving two analog signals with the frequencies of w and 2 w.
And the signal receiving and processing module is used for amplifying the terahertz signal, performing up-conversion processing and generating a digital signal through a low-pass filter. As shown in fig. 7, the terahertz signal received through the horn antenna first needs to be amplified by a low noise amplifier to reduce noise and improve the signal-to-noise ratio.
The synchronous clock unit decides the frequency of the mixing local oscillator at demodulation according to the final modulation carrier frequency.
For demodulation of the set of terahertz signals, the frequency multiplier x 2 should be selected when the result of the exclusive-or processing module is odd, and the frequency multiplier x 1 should be selected for even.
In the signal receiving and processing module, after the received signal is amplified, the signal is mixed and multiplied with a carrier wave with w frequency, and the obtained signal is:
m1(t)＝[g1(t)coswt+g2(t)sinwt]coswt＝1/2g1(t)+1/2[g1(t)cos2wt+g2(t)sin2wt]
m2(t)＝[g1(t)coswt+g2(t)sinwt]sinwt＝1/2g2(t)+1/2[g1(t)sin2wt-g2(t)cos2wt]
the corresponding signal multiplied by the mixing frequency of 2w is:
n1＝[k1(t)cos2wt+k2(t)sin2wt]cos2wt＝1/2k1(t)+1/2[k1(t)cos4wt+k2(t)sin4wt]
n2＝[k1(t)cos2wt+k2(t)sin2wt]sin2wt＝1/2k2(t)+1/2[k1(t)sin4wt-k2(t)cos4wt]
mixing up-conversion, mixing high-frequency carrier wave with received modulation signal, in order to separate high-frequency and low-frequency signals, the signals obtained by mixing are all the sum of a digital signal and a high-frequency analog signal.
A low pass filter for filtering the high frequency signal to leave a desired baseband signal, 4 kinds of m1 (t) =1/2 g1 (t), m2 (t) =1/2 g2 (t), n1 (t) =1/2 k1 (t) and n2 (t) =1/2 k2 (t), respectively.
And the level judgment module is used for carrying out level extraction and judgment on the baseband signal, setting a certain threshold value according to the amplitude and phase positions which are respectively judged by two paths and the judgment threshold of the level extraction and judgment, reducing the error rate, carrying out level sampling quantization, discretizing the amplitude of the baseband signal according to a certain sampling frequency, and carrying out zero-cutting rounding quantization on the amplitude.
Level conversion, converting the binary number of the QAM modulation order into a binary sequence.
Serial-parallel conversion is used for restoring two paths of parallel binary sequences into binary data, and the binary data is also an original signal transmitted by a terahertz communication system.
In summary, the improvement of the QAM modulation in this embodiment, from amplitude modulation and phase modulation to adding carrier frequency factors to the inside, thereby increasing the judgment conditions in the sampling judgment process, and achieving the purpose of reducing the error rate of the terahertz communication system transmission.
In this embodiment, a terahertz communication system including a terahertz communication transmitting end and a terahertz communication receiving end is further provided, through which when the same amount of data is transmitted, the noise margin of the communication system is improved, the error rate is reduced by about 50%, and in the terahertz wireless communication system, the signal-to-noise ratio threshold in the terahertz high-frequency transmission process is made up.
The foregoing description is only of the preferred embodiments of the invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalent structure or equivalent flow scheme disclosed in the specification and drawings, or any other related art, directly or indirectly, as desired.
Claims (8)
1. The terahertz communication method is characterized by being used for a transmitting end and comprising the following steps:
binary communication data are acquired, and the binary communication data are segmented to obtain two paths of parallel binary sequences;
converting the binary sequence into a target binary sequence;
modulating a target system sequence by using two carriers with the same frequency and a primary phase difference pi/2 respectively to obtain two paths of orthogonal signals, and performing mixed superposition processing on the two paths of orthogonal signals to obtain a mixed signal;
determining a frequency multiplication value of a frequency multiplier to a preset carrier wave based on the binary sequence, and multiplying the frequency of the preset carrier wave according to the frequency multiplication value to obtain a frequency multiplication signal;
mixing the frequency multiplication signal with the mixed signal to obtain an output signal, and transmitting the output signal through a transmitting antenna;
the determining the frequency multiplication value of the frequency multiplier to the preset carrier based on the binary sequence comprises the following steps: performing exclusive or processing on the two paths of parallel binary sequences to obtain binary processing data; judging the high-low level corresponding to the binary processing data according to the parity of the numerical value in the binary processing data; based on the high and low levels, matching the carrier frequency mapped by the binary processing data to determine the frequency multiplication value of the frequency multiplier to the preset carrier;
if the number of the numerical values 1 in the binary processing data is an odd number, determining that the frequency multiplication value of the frequency multiplier to the preset carrier is 0; if the number of the numerical values 1 in the binary processing data is even, determining that the frequency multiplication value of the frequency multiplier to the preset carrier is 1.
2. The terahertz communication method of claim 1, wherein the modulation adopts QAM modulation, and the target binary sequence is a sequence of a corresponding binary of the QAM modulation.
3. The terahertz communication method of claim 1, which is used for a receiving end, comprising:
mixing the received input signal with the frequency multiplication signal to obtain a baseband signal;
performing level extraction and judgment processing on the baseband signal to enable the baseband signal to discretize the amplitude according to a preset sampling frequency, and performing zero-rounding quantization processing on the amplitude to obtain two paths of target binary sequences;
converting the target binary sequence into a binary sequence;
the two binary sequences are combined into baseband binary data.
4. The terahertz communication method of claim 3, wherein the mixing process of the received input signal with the frequency-multiplied signal further includes, before obtaining the baseband signal: upon receiving an input signal, the input signal is processed with a low noise amplifier to low noise amplify the input signal.
5. The terahertz communication method of claim 4, wherein the mixing processing of the received input signal and the frequency-multiplied signal to obtain a baseband signal specifically includes:
obtaining demodulation mixing frequency of an input signal, and mixing the same-frequency pre-high-frequency carrier wave with the input signal to obtain a baseband mixing signal;
and processing the baseband mixed signal by using a low-pass filter to obtain a baseband signal.
6. The terahertz communication transmitting end based on the terahertz communication method of claim 1, comprising:
the serial-parallel conversion module is used for obtaining binary communication data, dividing the binary communication data and obtaining two paths of parallel binary sequences;
the level conversion module is used for converting the binary sequence into a target binary sequence;
the signal superposition module is used for respectively modulating the target system sequence by utilizing two carriers with the same frequency and the primary phase difference pi/2 to obtain two paths of orthogonal signals, and carrying out mixed superposition processing on the two paths of orthogonal signals to obtain mixed signals;
the frequency multiplication selection module is used for determining a frequency multiplication value of a frequency multiplier to a preset carrier wave based on the binary sequence, and carrying out frequency multiplication on the preset carrier wave according to the frequency multiplication value to obtain a frequency multiplication signal;
and the signal transmission processing module is used for carrying out frequency mixing processing on the frequency multiplication signal and the mixed signal to obtain an output signal, and transmitting the output signal through a transmitting antenna.
7. The terahertz communication receiving end based on the terahertz communication method of claim 3, comprising:
the signal receiving and processing module is used for carrying out frequency mixing processing on the received input signal and the frequency multiplication signal to obtain a baseband signal;
the level judgment module is used for carrying out level extraction and judgment processing on the baseband signal so as to enable the baseband signal to discretize the amplitude according to a preset sampling frequency, and carrying out quantization processing of zero-cutting and rounding on the amplitude to obtain two paths of target system sequences;
the level conversion module is used for converting the target binary sequence into a binary sequence;
and the serial-parallel conversion module is used for combining the two paths of binary sequences into baseband binary data.
8. A terahertz communication system, comprising:
the terahertz communication transmitting end of claim 6; and
the terahertz communication receiving end of claim 7.
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