LU102121B1 - Time Division Multiple Access Communication Method based on Harmonic Modulation Technology - Google Patents
Time Division Multiple Access Communication Method based on Harmonic Modulation Technology Download PDFInfo
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- LU102121B1 LU102121B1 LU102121A LU102121A LU102121B1 LU 102121 B1 LU102121 B1 LU 102121B1 LU 102121 A LU102121 A LU 102121A LU 102121 A LU102121 A LU 102121A LU 102121 B1 LU102121 B1 LU 102121B1
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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
- 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
- H04L27/2626—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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- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
The present invention discloses a time division multiple access communication method based on a harmonic modulation technology, wherein in a broadband wireless carrier, time is divided into periodic frames, and each frame is further divided into a number of time slots, each user signal occupies a different time slot, and a user uses one designated time slot to send and receive signals in turn on a periodic basis; and under the same frequency and the same designated time slot, the fundamental frequency and harmonics are simultaneously used for information transmission, achieving simultaneous communication with N different users. The process of the information transmission is as follows: different information is firstly modulated and then is separately loaded on different harmonic components, different information is transmitted through different harmonic components, so that simultaneous communication with N different users is achieved under the same frequency and the same designated time slot, and finally the fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all the information transmitted. The present invention makes full use of the ability of harmonics to transmit information and greatly improves the utilization rate of existing frequency spectrum resources.
Description
BL-5168 TIME DIVISION MULTIPLE ACCESS COMMUNICATION METHOD BASED ON (4102121
HARMONIC MODULATION TECHNOLOGY Technical field The present invention relates to the technical field of communications, and in particular, to a time division multiple access communication method based on harmonic modulation technology. Technical background For a long time in the past, letters have been the main force for transmitting information, and postmen have been responsible for receiving and sending letters. In fact, mobile phone communication is a means of information exchange just like | 15 letter delivery, and the "postmen" that help mobile phones transmit information are electromagnetic waves. This invisible and intangible carrier transmits a sound signal of one person to another. In addition to the mobile phones, electromagnetic waves are also the "postmen" that transmit information to wireless devices such as radio and Wi-Fi. Different forms of information transmission will use electromagnetic waves of different frequencies. For example, the 1880 MHz to 1900 MHz frequency band is used for 4G communication services for Chinese mobile users, and the 2.4 GHz frequency band is used for home Wi-Fi services.
Both mobile phones and Wi-Fi are radio services. The frequency range used by these radio services is in the range of 3 Hz to 300 GHz, and the wireless electromagnetic wave frequency in this range is collectively referred to as a radio frequency spectrum.
Professionals divide the above-mentioned frequency spectrum resources into
BL-5168 many frequency bands, and these frequency bands can only be used for specific HU102121 services, which is equivalent to assigning special "postmen" for different communication services. For example, the Federal Communications Commission of the United States stipulates that the 28 GHz frequency band of frequency spectrum resources is used to develop 5G wireless networks, and then the 28 GHz "postman" can only serve 5G network information transmission. It is conceivable that if there is no "postman", no matter how brilliant 5G is, there will be no martial arts and no "stage".
However, to a certain extent, the frequency spectrum resources are scarce at present. Due to the low electromagnetic wave propagation loss, long coverage distance, and low development difficulty in low frequency bands, this type of frequency spectrum resource is mainly used in systems such as broadcasting, television, and paging systems that started very early. However, high frequency bands of frequency spectrum resources are just the opposite. The higher the frequency is, the more difficult it is to develop the technology, and the higher the service cost is. At present, there are fewer high frequency band resources available and affordable to people. Therefore, at present, the remaining amount of high-quality resources in the high and low frequency bands is very limited.
However, the conventional time division multiple access communication method is to divide transmission time into a number of time slots, each user signal occupies a different time slot, and a user uses one designated time slot to send and receive signals in turn on a periodic basis. The users are distinguished by time to realize | 25 multiple address communication. In this way, under the same operating frequency, the conventional time division multiple access communication method can only achieve communication with one user within one designated time slot, which greatly reduces the utilization rate of the frequency spectrum. Then, in the case where the current frequency spectrum resource supply is so limited, how to use the time division multiple access communication method so that it exerts the maximum effectiveness of the frequency spectrum resources is a problem that is currently
BL-5168 urgently needed to be overcome. LU102121 Summary of the invention An objective of the present invention is to overcome the shortcomings of the prior art and provide a time division multiple access communication method based on harmonic modulation technology with high spectrum utilization. | In order to achieve the above objective, the technical solution provided by the present invention is: A time division multiple access communication method based on a harmonic modulation technology, wherein in a broadband wireless carrier, time is divided into periodic frames, and each frame is further divided into a number of time slots, each IS user signal occupies a different time slot, and a user uses one designated time slot to send and receive signals in turn on a periodic basis; and under the same frequency and the same designated time slot, the fundamental frequency and harmonics are simultaneously used for information transmission, achieving simultaneous communication with N different users.
Further, the process of the information transmission is as follows: different information is firstly modulated and then is separately loaded on different harmonic components, different information is transmitted through different harmonic components, so that simultaneous communication with N different users is achieved under the same frequency and the same designated time slot, and finally the fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all the information transmitted.
Further, before the information transmission, a fixed harmonic mode is stored in advance and a given harmonic component is used to calculate all the different
BL-5168 signals, thereby demodulating a desired signal from other signals. LU102121 Further, based on the fixed harmonic mode stored in advance, a given harmonic component is used to calculate both two different signals, so that the specific process of demodulating a desired signal from other signals is as follows: assuming that all harmonic modes are known: Vie = Go fo ta fata fi+afy+afs+--+a fa (1) where 9 represents a n-th harmonic coefficient, n = 0, 2, 3, 4, ...; Jo represents the fundamental frequency; Si represents a m-th harmonic component, and m = 2, 3,4, ....
At this time, both a first signal and a second signal are loaded on even and odd harmonics for transmission, respectively, and the following can be obtained: Ve =a fra" fi+ralfi+al fo +a fit (2) Voie 0 ota’ ital fi+a fr +a, fot (3) Finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Vu =a fora’ h+a"f+a fi+alfi+a fa +a’ fo+a, fa +57 fy +a) tee (4) it can be known from (1) and (4) that:
BL-5168 a fi +a f,=af, (5) LU102121 a fra fia) frau fas fa fsa” fy=ag fe ©) sa fra fal fafa) fia fas f= fe (7) Since the fundamental frequency used when transmitting the first signal and the second signal is the same, only the harmonic components are different, and it can be known from (5) that: a) fy=al fy=5 aul, (8) Therefore, according to formulas (6)-(8), the receiving end can demodulate both the first signal and the second signal.
Further, when the different information is modulated and then is separately loaded on different harmonic components for information transmission, different combinations of harmonic components may further be selected for transmission of signals as needed.
Compared with the prior art, the principle and advantages of the present solution are as follows: The present solution uses the harmonic modulation technology to modulate the information needed to be transmitted, then separately loads it on different harmonic components or component combinations to transmit the information, and finally restores all the information loaded on the harmonic components or component combinations according to the fixed harmonic mode stored in advance. As a result,
BL-5168 simultaneous communication with N different users is achieved under the same LU102121 frequency and the same designated time siot, effectively improving the utilization rate of the frequency spectrum, and also enabling the frequency spectrum resources to exert their maximum effectiveness.
Brief description of the drawings In order to more clearly illustrate the technical solutions in embodiments of the present invention or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly described below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and other accompanying drawings can be obtained by those of ordinary skill in the art from these without creative efforts.
Fig. 1 is a schematic diagram of a working principle of the conventional time division multiple access communication method; Fig. 2 is a working schematic diagram of a time division multiple access communication method based on a harmonic modulation technology; and Fig. 3 is a harmonic modulation circuit diagram. Detailed description of the embodiments The present invention will be further described below in conjunction with the conventional time division multiple access communication method and a specific embodiment of the present invention: The conventional time division multiple access communication method is to divide time into periodic frames in a broadband wireless carrier, each frame is divided into a number of time slots (the frames or time slots do not overlap each other), and each slot is one communication channel that is allocated to a user.
BL-5168 LU102121 As shown in Figure 1, according to a certain time slot allocation principle, the system enables each mobile station to send signals (burst signals) to a base station only at a designated time slot within each frame.
Under the conditions of satisfying timing and synchronization, the base station can receive the signals of the mobile stations in each time slot without interfering with each other.
At the same time, the signals sent by the base station to each mobile station are sequentially transmitted in predetermined time slots.
As long as each mobile station receives in the designated time slot, it can distinguish the signals sent to it from the received signals.
However, under the same frequency, only one user can communicate at a time within the designated time slot, which causes a waste of frequency spectrum resources to a certain extent.
However, think about the natural communication between humans.
For 7 billion people, its frequency bandwidth is only 20 Hz-20 kHz! Noise, animals, wind, trees and other natural sounds only occupy this bandwidth.
However, the humans can easily identify them.
For example, in a concert, many different instruments play the same melody, but the people can identify each instrument.
The reason is that every instrument is playing the same pitch (the same fundamental frequency), but the »0 modes of the harmonics are different.
This shows that, in fact, harmonics can also carry information, and not only the fundamental frequency currently in common use can carry information.
Based on this, as shown in Fig. 2, the present embodiment sets forth a time division multiple access communication method based on a harmonic modulation technology, which is specifically as follows: In a broadband wireless carrier, time is divided into periodic frames, and each frame is further divided into a number of time slots, each user signal occupies a different time slot, and a user uses one designated time slot to send and receive signals in turn on a periodic basis; and under the same frequency and the same ee — ES
BL-5168 designated time slot, the fundamental frequency and harmonics are simultaneously LU102121 used for information transmission, achieving simultaneous communication with N different users.
Specifically, the process of the information transmission is as follows: Different information is firstly modulated and then is separately loaded on different harmonic components, different information is transmitted through different harmonic components, so that simultaneous communication with N different users is achieved under the same frequency and the same designated time slot, and finally the fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all the information transmitted.
Herein, a harmonic modulation circuit is as shown in Figure 3. An output of the harmonic modulation circuit is a sum of all input voltages.
For inputs with the same fundamental frequency and different harmonic components, the outputs are different.
Before the information transmission, a fixed harmonic mode needs to be stored in advance so that a given harmonic component combination can be used to calculate all different signals, thereby demodulating a desired signal from other signals.
For a better understanding, it is assumed that all harmonic modes are known (two signals need to be calculated): Vou =a, f, +a, f, +a fsa for asfs ota fy (1) where “ represents a n-th harmonic coefficient, n = 0, 2, 3, 4, ...; Jo represents the fundamental frequency; Js represents a m-th harmonic component, and m = 2, 3, 4, …
At this time, both a first signal and a second signal are loaded on even and odd harmonics for transmission, respectively, and the following can be obtained: ESS KA.
BL-5168 VE =a fora’ fia fia fora foto (2) LU102121 Vin =a) ht; Has fi+a 405 foto (3) Finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Vou 790 Jota fo + af, +a’ f+a f+ a’ fi+al fora fa fia) foto (4) It can be known from (1) and (4) that: af +a)” fa (5) a’ f,=a,f,sa” Ja =a,f,:a5" [= s: a5" fs =a foi (6)
a; fi=a. [a5 fs =a, fsa," f;=a, 1:05" fs VARS (7) Since the fundamental frequency used when transmitting the first signal and the second signal is the same, only the harmonic components are different, and it can be known from (5) that: vp pp] a, fo=a, fom af 2 (8) Therefore, according to formulas (6)-(8), the receiving end can demodulate both the first signal and the second signal.
In addition to the above, different combinations can be used to transmit the first signal and the second signal.
For example, the first signal is loaded with the second and third harmonic components, and the second signal is loaded with the fourth harmonic component.
When in actual use, different combinations of harmonic ee ———————————
BL-5168 components can be selected for transmitting the signals as needed. LU102121 The present embodiment mainly uses the harmonic modulation technology within | each designated time slot, and loads the information on different harmonic components or component combinations for information transmission. In this way, simultaneous communication with N different users can be achieved within each designated time slot, effectively improving the utilization rate of the frequency spectrum, and also enabling the frequency spectrum resources to exert their maximum effectiveness.
The embodiments described above are only preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any changes made according to the shape and principle of the present invention should be covered by the scope of protection of the present invention.
Claims (5)
1. A time division multiple access communication method based on a harmonic modulation technology, characterized in that in a broadband wireless carrier, time is > divided into periodic frames, and each frame is further divided into a number of time slots, each user signal occupies a different time slot, and a user uses one designated time slot to send and receive signals in turn on a periodic basis; and under the same frequency and the same designated time slot, the fundamental frequency and harmonics are simultaneously used for information transmission, 10° achieving simultaneous communication with N different users.
2 The time division multiple access communication method based on the harmonic modulation technology according to claim 1, characterized in that the process of the information transmission is as follows: different information is firstly modulated and then is separately loaded on different harmonic components, different information is transmitted through different harmonic components, so that simultaneous communication with N different users is achieved under the same frequency and the same designated time slot, and finally the fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all the information transmitted.
3. The time division multiple access communication method based on the harmonic modulation technology according to claim 2, characterized in that before the information transmission, a fixed harmonic mode is stored in advance and a given harmonic component is used to calculate all the different signals, thereby demodulating a desired signal from other signals.
4. The time division multiple access communication method based on the harmonic modulation technology according to claim 3, characterized in that based on the fixed harmonic mode stored in advance, a given harmonic component is used to ——-+=”””””"””"”""”"""——"———
BL-5168 calculate both two different signals, so that the specific process of demodulating a LU102121 desired signal from other signals is as follows: assuming that all harmonic modes are known:
V. =af,+afra fia firafs ota San (1) where % represents a n-th harmonic coefficient, n = 0, 2, 3, 4, … Jo represents the fundamental frequency, Ja represents a m-th harmonic component, and m = 2, 3,4,... at this time, both a first signal and a second signal are loaded on even and odd harmonics for transmission, respectively, and the following can be obtained: Va #00 ht a?’ f,+a 1, Ha fora ht (2) Vi =a, fora fora fora frag ot (3) finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Vow = Jo + a fota’ fo + a fra ff Has fi + al fo+a fr +a fy+ag foto (4) it can be known from (1) and (4) that:
a," fo +a," fo=a fo (5) ee
BL-5168 LU102121 ay fa, fsa fi=a fis a ITA fos a” fy=ag fg (6) a, fa frac) fi=as fs a; =a, fr 0" fy=a, foi (7) since the fundamental frequency used when transmitting the first signal and the second signal is the same, only the harmonic components are different, and it can be known from (5) that: vo ppl a,’ fy=a,” 55 %h 2 (8) therefore, according to formulas (6)-(8), the receiving end can demodulate both the first signal and the second signal.
5. The time division multiple access communication method based on the harmonic modulation technology according to claim 2, characterized in that when the different information is modulated and then is separately loaded on different harmonic components for information transmission, different combinations of harmonic components may further be selected for transmission of signals as needed.
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| FR2900522A3 (en) * | 2006-04-28 | 2007-11-02 | Thales Sa | ENHANCED FREQUENCY HOPPING COMMUNICATION METHOD AND DEVICE |
| CN103338176B (en) * | 2013-06-13 | 2016-08-24 | 上海理工大学 | A kind of implementation method of waveform reuse modulator-demodulator |
| US20160380667A1 (en) * | 2015-06-23 | 2016-12-29 | Qualcomm Incorporated | Harmonic-based coding |
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