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  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    The present invention discloses a space division multiple access communication method based on a harmonic modulation technology, wherein an adaptive array antenna is used to achieve spatial division, different beams are formed in different user directions, and different antenna beams are used to provide information access for users in different regions; and the same carrier frequency or different carrier frequencies used to serve different regions covered by the antenna beams each use a fundamental frequency and harmonics for information transmission. A process of the information transmission is as follows: different information is modulated and then is separately loaded on different harmonic components or component combinations, and finally fundamental frequency and harmonic information received by a receiving end is demodulated. The present invention makes full use of the ability of the harmonics to transmit information, greatly improves the utilization rate of the frequency spectrum, and also greatly excavates and stimulates the potential of the existing frequency spectrum resources simultaneously, so that the existing space division multiple access communication method can yield unusually brilliant results in the forthcoming 5G era.
    公开号:NL2026741A
    申请号:NL2026741
    申请日:2020-10-23
    公开日:2021-08-17
    发明作者:Ma Jianguo；Zhou Shaohua
    申请人:Univ Guangdong Technology；
    IPC主号:
    专利说明:

    Space 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 space division multiple access communication method based on a harmonic modulation technology. Technical background The radio frequency spectrum generally refers to a general term of radio frequencies that emit radio waves in the frequency range of 9 KHz to 3000 GHz. All radio services are inseparable from radio frequencies, just as the vehicles must be on the roads.
    The characteristics of the radio frequency spectrum make it a basic resource for the telecommunications industry. First of all, the radio frequency spectrum is limited. Due to the propagation characteristics of radio waves at higher frequencies, radio services cannot use radio frequencies at higher frequencies indefinitely. At present, the humans cannot develop and utilize frequencies above 3000 GHz. Although the use of radio frequency spectrum can be to multiplex the frequencies based on four methods of time, space, frequency and coding, in terms of a certain frequency band and a certain frequency, the use of frequency is limited in a certain region, a certain time and a certain condition. Secondly, the radio frequency spectrum has exclusivity. Radio frequency spectrum resources have the same attribute as other resources, that is, exclusivity. Once used in a certain time, region and frequency domain, other devices can no longer use them. The two characteristics determine that once the radio frequency spectrum of a certain frequency band is assigned to a certain service, it means that other services and even devices cannot use this frequency band.
    With the advancement of radio technology and the economic and social development, a large number of radio devices of various uses and various types have emerged, and the demand for radio frequencies in various industries is increasing. The current trend is that with the further development of China's economy, road and rail transportation, air transportation, and maritime transportation will further increase the demand for related communication and navigation technologies, especially the emerging GPS positioning and satellite communications.
    Communications and navigation services related to these areas will then occupy some of the radio frequency spectrum bands.
    Therefore, the frequency band reserved for the telecommunications industry in the future,
    especially for the future 5G networks will become increasingly scarce resources.
    As shown in Fig. 1, a conventional space division multiple access communication method distinguishes different users by dividing the space.
    It uses wireless directional beams to divide cells into different subspaces to achieve orthogonal isolation in space.
    The conventional space division multiple access communication method uses different antenna beams to provide access for users in different regions.
    The same frequency (in a CDMA system) or different frequencies (in a FDMA system) are used to serve these different regions covered by the antenna beams.
    In the above CDMA system and FDMA system, only the fundamental frequency is used for information transmission, and the ability to transmit information by harmonics is ignored.
    In this way, frequency spectrum resources will be wasted.
    Especially when the current frequency spectrum resources are so tight (especially in the forthcoming 5G era), the frequency spectrum resources cannot be fully utilized, and then the conventional space division multiple access communication method will be eliminated because they cannot meet the current actual needs.
    Therefore, how to improve the frequency spectrum utilization of the space division multiple access communication method has become a problem that is currently urgently needed to be solved.
    Summary of the invention An objective of the present invention is to overcome the shortcomings of the prior art and provide a space division multiple access communication method based on a harmonic modulation technology with high frequency spectrum utilization.
    In order to achieve the above objective, the technical solution provided by the present invention is: A space division multiple access communication method based on a harmonic modulation technology, wherein an adaptive array antenna is used to achieve spatial division, different beams are formed in different user directions, and different antenna beams are used to provide information access for users in different regions; and the same carrier frequency or different carrier frequencies used to serve different regions covered by the antenna beams each use a fundamental frequency and harmonics for information transmission. Further, a process of the information transmission is as follows: different information is firstly modulated and then is separately loaded on different harmonic components, and finally fundamental frequency and harmonic information received by a receiving end is demodulated. Further, before the information transmission, a fixed harmonic mode is stored in advance and a given harmonic component is used to calculate all 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 all two different signals, so that a specific process of demodulating a desired signal from other signals is as follows:
    assuming that all harmonic modes are known: Vout = ay fo + ax fr + asfs + ayfs + as fs toet an fm (1) where a, represents a n-th harmonic coefficient, n= 0, 2, 3, 4, ...; fo represents the fundamental frequency; f,,, 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 = QF fo + QP fo + as fy + ag" fo + agh fo + + (2) Vour = ap fot az’fa+as'fs +a; f + a” fo + (3)
    finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is:
    Vour = A fo + oP fo + af + asf + alfa + as" fs + ag¥ fo + a" 5 + agP fg + ay’ fo + se (4) it can be known from (1) and (4) that: ao' fo + a fo = ao fo (5)
    WP fo = afz; 04 P fou = auf Ue fo = aefei as’ fo = agfy 7 (6) as fs = asf 05" fs = asfs 07" fr = ax fra" fo = agfe (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:
    Oe fo = af fo = “asf (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 5 on different harmonic components for information transmission, different combinations of harmonic components may 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 load information separately on different harmonic components or component combinations, and uses harmonics to transmit information, making full use of the ability of harmonics to transmit information, greatly improving the utilization rate of the frequency spectrum, and further greatly excavating and stimulating the potential of the existing frequency spectrum resources simultaneously, so that the existing space division multiple access communication method can yield unusually brilliant results in the forthcoming 5G era.
    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 a conventional space division multiple access communication method; Fig. 2 is a working schematic diagram of a space 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 specific embodiments: 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 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 space division multiple access communication method based on a harmonic modulation technology, which is specifically as follows: An adaptive array antenna is used to achieve spatial division, different beams are formed in different user directions, and different antenna beams are used to provide information access for users in different regions; and the same carrier frequency or different carrier frequencies used to serve different regions covered by the antenna beams each use a fundamental frequency and harmonics for information transmission.
    Specifically, a process of the information transmission is as follows: Different information is firstly modulated and then is separately loaded on different harmonic components, and finally fundamental frequency and harmonic information received by a receiving end is demodulated.
    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 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): Vous = ofo + dzf2 + asfs + afs + asfs + + an fm (1) where a, represents a n-th harmonic coefficient, n= 0, 2, 3, 4, … fo represents the fundamental frequency; fn 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 = GP fo + ao fo + a,P fo + ag fo + ag fg + + (2) Voue = ao" fo + as’ fa + as” fs + a; fr + ag” fo + (3)
    finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Vour = ao" fot af fo + a fa + as’ fs + af fi + ast fs + asf fo + a; f+ ag fs + ag’ fy + hi (4) it can be known from (1) and (4) that: ag’ fo + af fo = anf (8)
    QP fr = 2/2; 040 fo = au fi; Ge fo = asf; as fg = agfa / (6) as¥ fz = a3f3:05"fs = asfs; 0," fF; = asf 0" fo = dofs 5" (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: OS afo=alffy= ~aofo (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 uses the harmonic modulation technology to load information separately on different harmonic components or component combinations, and uses harmonics to transmit information, making full use of the ability of harmonics to transmit information, greatly improving the utilization rate of the frequency spectrum, and also greatly excavating and stimulating the potential of the existing frequency spectrum resources simultaneously, so that the existing space division multiple access communication method can yield unusually brilliant results in the forthcoming 5G era.
    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 application.
    权利要求:
    Claims (5)
    [1]
    1. A multi-access spatial division communication method based on harmonic modulation technology, using an adaptive array antenna to achieve a spatial division, forming different beams in different user directions, and using different antenna beams to provide information access for users in different directions. areas; characterized in that the same carrier frequency, or different carrier frequencies used to serve different areas covered by the antenna beams, each use a fundamental frequency and harmony for information transmission.
    [2]
    The multi-access space-dividing communication method based on harmonic modulation technology according to claim 1, characterized in that a process of the information transmission is as follows: different information is modulated first and then loaded onto different harmonic components separately, and finally fundamental frequency is and harmonic information received by a receiving end is demodulated.
    [3]
    The multi-access space dividing communication method based on 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 different signals, whereby a desired signal is demodulated with respect to other signals.
    [4]
    The multi-access space dividing communication method based on 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 any two different signals, so that a specific process of demodulating a desired signal relative to other signals proceeds as follows:
    assuming all harmonic modes are known: Vour = Qofo + 2f2 + G3f3 + Agfa + asfs + + anf(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, withm = 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:
    Vie = dot fo + 92 fz + aPfy + ag fo + agP fo +" (2)
    Vous = "fo + a3" fz + as” fs + af +ag"fg + (3) finally a mixed signal of the first signal and the second signal received simultaneously at the signal-receiving end corresponds to:
    Vout = ao fo + ao' fo + azPf + as fs + a' fu + as" fs + agPfs + a7" f7 + agP fo + ag” fo + + (4) it is known from (1) and (4) Which:
    ao' fo + ao fo = aofo (5)
    GP fr = ax fa 040 fo = auf a6 fe = Gsfei asl fo = agfe + (6)
    afi=asfs;as' fs = asf a" fr = ar fra" fo = or ; (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:
    a' fo = ag' fo = ~aofy (8) so that according to formulas (6)-(8), the receiving end can demodulate the first signal as well as the second signal.
    [5]
    The multi-access space dividing communication method based on 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 transmission of signals as needed.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    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
    CN201911279169.4A|CN111132334A|2019-12-13|2019-12-13|Space division multiple access communication method based on harmonic modulation technology|
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