CN111163024B - Time division multiple access communication method based on harmonic modulation technology - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/16—Frequency regulation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/20—Time-division multiplex systems using resonant transfer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/28—Systems using multi-frequency codes with simultaneous transmission of different frequencies each representing one code element
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Abstract
The invention discloses a time division multiple access communication method based on harmonic modulation technology, on a broadband wireless carrier, dividing time into periodic frames, dividing each frame into a plurality of time slots, wherein each user signal occupies different time slots, and a user uses a designated time slot to send and receive signals in turn according to periods; and simultaneously transmitting information by using fundamental frequency and harmonic wave under the same frequency and the same appointed time slot, thereby realizing simultaneous communication with N different users. The information transmission process comprises the following steps: different information is modulated, then the different information is loaded on different harmonic components respectively, the different information is transmitted through the different harmonic components, so that the simultaneous communication with N different users is realized under the same frequency and the same appointed time slot, and finally the fundamental frequency and the harmonic information received by a receiving end are demodulated, and all the transmitted information can be obtained. The invention fully utilizes the capability of harmonic transmission information and greatly improves the utilization rate of the existing frequency spectrum resources.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a time division multiple access communication method based on a harmonic modulation technology.
Background
For a long time, letters were the main force of transmitting information, and postmen took charge of letter receiving and sending work. In fact, mobile phone communication is the same as letter transfer, and is the means for realizing information communication, and the "postman" helping the mobile phone to transfer information is electromagnetic waves. Such invisible, untouched carriers deliver the sound signal of one person to another.
Besides mobile phones, electromagnetic waves are also "postman" for information transmission by wireless devices such as broadcasting and Wi-Fi. Different forms of information transmission modes can use electromagnetic waves with different frequencies, such as a 1880 MHz-1900 MHz frequency band used for 4G communication service of China mobile users, and a 2.4GHz frequency band used for household Wi-Fi service.
Both mobile and Wi-Fi belong to radio services. These radio services use frequencies in the range of 3Hz to 300GHz, and the frequencies of radio electromagnetic waves in this range are collectively referred to as the radio spectrum.
The skilled person divides the above-mentioned spectrum resources into a number of frequency bands which can only be used for specific services, corresponding to assigning a special "postman" to different communication services. For example, the federal communications commission in the united states stipulates that the spectrum resources in the 28GHz band be used to develop 5G wireless networks, and then the 28GHz "postman" can only serve 5G network information delivery. It is conceivable that without "postman", no matter how 5G is available, it is an empty military art, without a "stage" of the show.
However, to some extent, spectrum resources are scarce at present. Because the low-frequency-band electromagnetic wave has small propagation loss, long coverage distance and small development difficulty, the frequency spectrum resources are mainly applied to systems such as broadcasting, television, paging and the like which start early. On the contrary, the higher the frequency of the high-frequency band spectrum resource is, the greater the development technical difficulty is, the higher the service cost is, and the fewer high-frequency band resources which can be used by people at present are. Therefore, the remaining amount of high quality resources in the high and low frequency bands is very limited.
In the conventional time division multiple access communication method, transmission time is divided into a plurality of time slots, each user signal occupies different time slots, and a user uses a designated time slot to transmit and receive signals in turn according to periods. The users are distinguished according to time, and multiple access communication is realized. Thus, under the same working frequency, the traditional time division multiple access communication method can only realize the communication with 1 user in a specified time slot, which greatly reduces the utilization rate of frequency spectrum. In the situation that the spectrum resource supply is limited, how to utilize the tdma communication method to make the maximum effectiveness of the spectrum resource is a problem that needs to be overcome.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a time division multiple access communication method based on a harmonic modulation technology, which has high frequency spectrum utilization rate.
In order to realize the purpose, the technical scheme provided by the invention is as follows:
a time division multiple access communication method based on harmonic modulation technique divides the time into periodic frames on a broadband wireless carrier, each frame is divided into a plurality of time slots, each user signal respectively occupies different time slots, and the user uses a designated time slot to transmit and receive signals by turns according to the period; and simultaneously transmitting information by using fundamental frequency and harmonic wave under the same frequency and the same appointed time slot, thereby realizing simultaneous communication with N different users.
Further, the information transmission process is as follows: different information is modulated, then the modulated information is loaded on different harmonic components respectively, the different information is transmitted through the different harmonic components, so that the simultaneous communication with N different users is realized under the same frequency and the same appointed time slot, and finally, the fundamental frequency and the harmonic information received by a receiving end are demodulated, so that all the transmitted information can be obtained.
Further, before the information transmission, a fixed harmonic pattern is stored in advance, and all the different signals are calculated using a given harmonic component, thereby demodulating a desired signal from other signals.
Further, based on the pre-stored fixed harmonic patterns, all two different signals are calculated using the given harmonic components, so that the specific process of demodulating the desired signal from the other signals is as follows:
all harmonic modes are assumed to be known:
V out ＝a 0 f 0 +a 2 f 2 +a 3 f 3 +a 4 f 4 +a 5 f 5 +…+a n f m (1)
wherein, a n Representing the coefficient of nth harmonic, n =0,2,3,4, \ 8230; f. of 0 Represents the fundamental frequency; f. of m Representing the m-th harmonic component, m =2,3,4, \8230;
at this time, the first signal and the second signal are respectively and completely loaded on the even harmonic and the odd harmonic for transmission, so that:
finally, the mixed signal of the signal one and the signal two received at the signal receiving end is:
V out ＝a 0 v f 0 +a 0 p f 0 +a 2 p f 2 +a 3 v f 3 +a 4 p f 4 +a 5 v f 5 +a 6 p f 6 +a 7 v f 7 +a 8 p f 8 +a 9 v f 9 +… (4)
from (1) and (4):
a 0 v f 0 +a 0 p f 0 ＝a 0 f 0 (5)
a 2 p f 2 ＝a 2 f 2 ；a 4 p f 4 ＝a 4 f 4 ；a 6 p f 6 ＝a 6 f 6 ；a 8 p f 8 ＝a 8 f 8 ；… (6)
a 3 v f 3 ＝a 3 f 3 ；a 5 v f 5 ＝a 5 f 5 ；a 7 v f 7 ＝a 7 f 7 ；a 9 v f 9 ＝a 9 f 9 ；… (7)
since the fundamental frequencies used for transmitting the first signal and the second signal are the same and only the harmonic components are different, it can be known from (5):
therefore, the receiving end can demodulate both the signal one and the signal two according to the equations (6) - (8).
Further, when different information is modulated and then respectively loaded on different harmonic components to transmit signals, different harmonic component combinations can be selected according to requirements to transmit signals.
Compared with the prior art, the principle and the advantages of the scheme are as follows:
the scheme utilizes a harmonic modulation technology to modulate information to be transmitted, then the information is loaded on different harmonic components or component combinations to be transmitted, and finally the information loaded on the harmonic components or the component combinations is completely restored according to a pre-stored fixed harmonic mode. Therefore, the simultaneous communication with N different users can be realized under the same frequency and the same appointed time slot, the utilization rate of the frequency spectrum is effectively improved, and the frequency spectrum resources can exert the maximum effect.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the services required for the embodiments or the technical solutions in the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the operation of a conventional TDMA communication method;
FIG. 2 is a schematic diagram of an operation of a time division multiple access communication method based on a harmonic modulation technique;
FIG. 3 is a circuit diagram of a harmonic modulation circuit;
Detailed Description
The present invention will be further described with reference to a conventional time division multiple access communication method and embodiments of the present invention:
the traditional time division multiple access communication method divides time into periodic frames on a broadband wireless carrier, each frame is divided into a plurality of time slots (no matter the frames or the time slots are not overlapped), each time slot is a communication channel and is allocated to a user.
As shown in fig. 1, the system makes each mobile station transmit signals (burst signals) to the base station only according to the designated time slot in each frame according to a certain time slot allocation principle, and the base station can receive the signals of each mobile station in each time slot without mutual interference under the condition of satisfying timing and synchronization. Meanwhile, the signals sent by the base station to each mobile station are transmitted in a predetermined time slot in sequence, and each mobile station can distinguish the signals sent to it from the received signals as long as the mobile station receives in the designated time slot. However, on the same frequency, only 1 user can communicate at a time in a specified time slot, which results in a waste of spectrum resources to some extent.
To think of natural communication between human beings, the frequency bandwidth of a 70 hundred million human beings is only 20Hz-20kHz! All sounds in nature, such as noise, animals, wind, trees, etc., occupy only this bandwidth. But humans can recognize them without difficulty. For example, in a concert, there are many different instruments playing the same melody, but one can identify each instrument. The reason is that each instrument plays the same pitch (same fundamental frequency), but the harmonic patterns are different from each other. This means that in practice harmonics can also carry information, not just the fundamental frequencies that are currently in common use.
Based on this, as shown in fig. 2, the present embodiment describes a time division multiple access communication method based on a harmonic modulation technique, which specifically includes the following steps:
on a broadband wireless carrier, dividing time into periodic frames, dividing each frame into a plurality of time slots, wherein each user signal occupies different time slots, and the user uses a designated time slot to transmit and receive signals in turn according to periods; and simultaneously transmitting information by using fundamental frequency and harmonic wave under the same frequency and the same appointed time slot, thereby realizing simultaneous communication with N different users.
Specifically, the information transmission process is as follows:
different information is modulated, then the different information is loaded on different harmonic components respectively, the different information is transmitted through the different harmonic components, so that the simultaneous communication with N different users is realized under the same frequency and the same appointed time slot, and finally the fundamental frequency and the harmonic information received by a receiving end are demodulated, and all the transmitted information can be obtained.
The harmonic modulation circuit is shown in fig. 3, and the output of the harmonic modulation circuit is the sum of all input voltages. For inputs with the same fundamental frequency but different harmonic components, the outputs are different. Before information transmission, a fixed harmonic pattern is stored in advance, and all different signals can be calculated by using a given combination of harmonic components, thereby demodulating a desired signal from other signals.
For a better understanding, it is not assumed that all harmonic modes are known (the signals required for the calculation are two):
V out ＝a 0 f 0 +a 2 f 2 +a 3 f 3 +a 4 f 4 +a 5 f 5 +…+a n f m (1)
wherein, a n Representing the coefficient of nth harmonic, n =0,2,3,4, \ 8230; f. of 0 Represents the fundamental frequency; f. of m Representing the m-th harmonic component, m =2,3,4, \8230;
at this time, the first signal and the second signal are respectively and completely loaded on the even harmonic and the odd harmonic for transmission, so that:
finally, the mixed signal of the signal I and the signal II received by the signal receiving end is as follows:
V out ＝a 0 v f 0 +a 0 p f 0 +a 2 p f 2 +a 3 v f 3 +a 4 p f 4 +a 5 v f 5 +a 6 p f 6 +a 7 v f 7 +a 8 p f 8 +a 9 v f 9 +… (4)
from (1) and (4):
a 0 v f 0 +a 0 p f 0 ＝a 0 f 0 (5)
a 2 p f 2 ＝a 2 f 2 ；a 4 p f 4 ＝a 4 f 4 ；a 6 p f 6 ＝a 6 f 6 ；a 8 p f 8 ＝a 8 f 8 ；… (6)
a 3 v f 3 ＝a 3 f 3 ；a 5 v f 5 ＝a 5 f 5 ；a 7 v f 7 ＝a 7 f 7 ；a 9 v f 9 ＝a 9 f 9 ；… (7)
since the fundamental frequencies used for transmitting the first signal and the second signal are the same and only the harmonic components are different, it can be known from (5):
therefore, the receiving end can demodulate both the signal one and the signal two according to the equations (6) - (8).
In addition to the above, the first and second signals may be transmitted using different combinations, such as loading the first signal with second and third harmonic components and loading the second signal with a fourth harmonic component. In practical use, different harmonic component combinations can be selected according to requirements to transmit signals.
The present embodiment mainly uses a harmonic modulation technique in each designated time slot to load information on different harmonic components or component combinations for information transmission. Therefore, simultaneous communication with N different users can be realized in each appointed time slot, the utilization rate of the frequency spectrum is effectively improved, and the frequency spectrum resources can exert the maximum effectiveness.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (3)
1. A time division multiple access communication method based on harmonic modulation technique is characterized in that on a broadband wireless carrier, the time is divided into periodic frames, each frame is divided into a plurality of time slots, each user signal respectively occupies different time slots, and the user uses a designated time slot to send and receive signals by turns according to the period; the method comprises the following steps of simultaneously utilizing fundamental frequency and harmonic wave to carry out information transmission under the same frequency and the same appointed time slot, and realizing simultaneous communication with N different users, wherein the information transmission process comprises the following steps: firstly, different information is modulated, then the different information is loaded on different harmonic components respectively, the different information is transmitted through the different harmonic components, so that the simultaneous communication with N different users is realized under the same frequency and the same appointed time slot, finally, the fundamental frequency and the harmonic information received by a receiving end are demodulated, all the transmitted information can be obtained, before the information is transmitted, a fixed harmonic mode is stored in advance, all different signals are calculated by adopting the given harmonic components, and therefore, the required signals are demodulated from other signals.
2. The time division multiple access communication method based on the harmonic modulation technique as claimed in claim 1, wherein based on the pre-stored fixed harmonic patterns, all two different signals are calculated using the given harmonic components, so that the specific procedure for demodulating the desired signal from the other signals is as follows:
all harmonic modes are assumed to be known:
V out ＝a 0 f 0 +a 2 f 2 +a 3 f 3 +a 4 f 4 +a 5 f 5 +…+a n f m (1)
wherein, a n Representing the coefficient of nth harmonic, n =0,2,3,4, \ 8230; f. of 0 Represents the fundamental frequency; f. of m Represents m timesHarmonic component, m =2,3,4, \ 8230;
at this time, the first signal and the second signal are respectively and completely loaded on the even harmonic and the odd harmonic for transmission, and the following results can be obtained:
finally, the mixed signal of the signal one and the signal two received at the signal receiving end is:
V out ＝a 0 v f 0 +a 0 p f 0 +a 2 p f 2 +a 3 v f 3 +a 4 p f 4 +a 5 v f 5 +a 6 p f 6 +a 7 v f 7 +a 8 p f 8 +a 9 v f 9 +…(4)
from (1) and (4):
a 0 v f 0 +a 0 p f 0 ＝a 0 f 0 (5)
a 2 p f 2 ＝a 2 f 2 ；a 4 p f 4 ＝a 4 f 4 ；a 6 p f 6 ＝a 6 f 6 ；a 8 p f 8 ＝a 8 f 8 ；… (6)
a 3 v f 3 ＝a 3 f 3 ；a 5 v f 5 ＝a 5 f 5 ；a 7 v f 7 ＝a 7 f 7 ；a 9 v f 9 ＝a 9 f 9 ；… (7)
since the fundamental frequencies used for transmitting the first signal and the second signal are the same and only the harmonic components are different, it can be known from (5):
therefore, the receiving end can demodulate both the signal one and the signal two according to the equations (6) - (8).
3. The time division multiple access communication method based on the harmonic modulation technology as claimed in claim 1, wherein when the different information is modulated and then loaded on the different harmonic components to perform signal transmission, different combinations of the harmonic components can be selected according to requirements to perform signal transmission.
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| LU102121A LU102121B1 (en) | 2019-12-13 | 2020-10-12 | Time Division Multiple Access Communication Method based on Harmonic Modulation Technology |
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| CN103338176A (en) * | 2013-06-13 | 2013-10-02 | 上海理工大学 | Implementation method of waveform reuse modulator-demodulator |
| CN108777587A (en) * | 2018-07-26 | 2018-11-09 | 北京中电巨科技术有限公司 | A kind of power wire broadband carrier communication method |
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| PT1880560E (en) * | 2005-06-15 | 2010-12-07 | Huawei Tech Co Ltd | Method and system for allocating communication resources |
| FR2900522A1 (en) * | 2006-04-28 | 2007-11-02 | Thales Sa | METHOD AND APPARATUS FOR HIGH-FREQUENCY FREQUENCY JUMP COMMUNICATION |
| US20160380667A1 (en) * | 2015-06-23 | 2016-12-29 | Qualcomm Incorporated | Harmonic-based coding |
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| CN103338176A (en) * | 2013-06-13 | 2013-10-02 | 上海理工大学 | Implementation method of waveform reuse modulator-demodulator |
| CN108777587A (en) * | 2018-07-26 | 2018-11-09 | 北京中电巨科技术有限公司 | A kind of power wire broadband carrier communication method |
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