• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    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.
    公开号:NL2026743A
    申请号:NL2026743
    申请日:2020-10-23
    公开日:2021-08-17
    发明作者:Zhou Shaohua；Ma Jianguo
    申请人:Univ Guangdong Technology；
    IPC主号:
    专利说明:

    Time division multiple access communication method based on 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 along 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 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 many frequency bands, and these frequency bands can only be used for specific 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 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 urgently needed to be overcome.
    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 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 signals, thereby demodulating a desired signal from other signals.
    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: Voi = fora f ta fi ta fia fo+ +a, Js (1) where °: represents a n-th harmonic coefficient, n = 0, 2, 3, 4, ...; Js represents i the fundamental frequency; “* 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: Vie =a" Jota fy +a fi +a" ta f+ (2) Vie =d Jota fi ta Ji +ta fi tag ft (3) Finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Vie =a fy +a tat ta ta fas sta fora fr +a fy +a, Jot (4) it can be known from (1) and (4) that: a, fo +a," fy=a,f, (5) a,’ fa, fia," fi=a, fa" sz fia," Js fs (6) ay fy=a,fiias’ fi=as fia) fr=a, fra," fy=a, fs (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: v Pp 1 .
    a, fo=a," fo=7 ay 1, 2 (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 5 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, simultaneous communication with N different users is achieved under the same frequency and the same designated time slot, 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.
    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 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 designated time slot, the fundamental frequency and harmonics are simultaneously 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): Vu tata fi ta f ta ft +0 fi (1) , where % represents a n-th harmonic coefficient, n = 0, 2, 3, 4, ...; *° 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: Vie =a" fora)" fr ta fi +a’ fo +a) f+ (2) Vou =a, Jota tas fs ta f +a, f+ (3) Finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Var 4 Jota Tt ta [+a fra fra fora] fora tag fy +a) f+ (4) it can be known from (1) and (4) that: a, fo +a’ fy=a, fs (5) a,” fy=a, fra,” fa fa fo=a fea fy=ay fo (6) a; fi=as frag fi=as [iia fr=a, 1509 fy=a, fo (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: v p 1 a, fy=a," f,==a,f, 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 components can be selected for transmitting the signals as needed.
    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.
    权利要求:
    Claims (5)
    [1]
    1. Time dividing multiple access communication method based on a harmonic modulation technology, characterized in that in a wireless broadband carrier, time is divided into periodic pieces, and each piece is further divided into a number of epochs, each user signal occupying a different epoch and a user uses an allotted time slot to alternately send and receive signals on a periodic basis; and under the same frequency and the same allocated epoch, the fundamental {10 frequency and harmony is simultaneously used for information transmission, thus achieving simultaneous communication with N different users.
    [2]
    A time division multiple access communication method based on a harmonic modulation technology according to claim 1, characterized in that the information transmission process is as follows: different information is first modulated and then loaded separately on different harmonic components, different information is transmitted by different harmonic components, so that simultaneous communication is achieved with N different users under the same frequency and the same allocated time slot, and finally, fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all transmitted information.
    [3]
    A time division multiple access communication method based on a harmonic modulation technology according to claim 2, characterized in that prior to the information transmission, a fixed harmonic mode is pre-stored and a given harmonic component is used to calculate all the different signals, wherein a desired signal is demodulated relative to other signals.
    [4]
    4, Time division multiple access communication method based on a 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 calculate two different signals, so that the specific process of demodulating a desired signal relative to other signals proceeds as follows: assuming all harmonic modes are known:
    Vie =a foray fora fi+af bag fs +a. f, (1) where a, represents an nth harmonic coefficient, with n=0, 2, 3, 4...; fo represents the fundamental frequency; f, represents an mth harmonic coefficient, with m = 2, 3.4…; at this time, both a first signal and a second signal are loaded onto even and odd harmonics respectively for transmission, and the following can be obtained:
    Vo =a" Jota ta fi ta Jo tag ft (2) Vou =a) Jota fi+as fo+a; fr +a) fot (3) finally a mixed signal of the first signal and the second signal simultaneously at the signal-receiving end has been received, corresponds to: Vie =a Jota fra f ta fra fa fs ta fo ta fia fy tag photo (4) it is known from (1) and (4) that: ay fo +44" fo =a, J, (5) a)' fr=a, fra,” {za fag fi=ag fa" fo=ag fg (6)
    ay' f;za fas fs=as fs; a; fy=a, fia" fy=aq for (7)
    since the fundamental frequency used in transmitting the first signal and the second signal is the same, only the harmonic components differ from each other and it can be deduced from (5) that: vo ae 1 ay fo=a," => Go fo 2 (8) so that according to formulas (6)-(8), the receiving end can demodulate the first signal as well as the second signal.
    [5]
    A time division multiple access communication method based on a harmonic modulation technology according to claim 2, characterized in that when the different information is modulated and then loaded separately on different harmonic components for information transmission, different combinations of harmonic components can be selected for the transmission of signals as needed.
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    引用文献:
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    CN111698187A|2019-12-13|2020-09-22|广东工业大学|Frequency division multiple access communication method based on harmonic modulation technology|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN201911279413.7A|CN111163024A|2019-12-13|2019-12-13|Time division multiple access communication method based on harmonic modulation technology|
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