• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention discloses a code division multiple access communication method based on a harmonic modulation technology, wherein user signals are divided by using mutually orthogonal address code sequences, information transmission between users is fonNarded and controlled by a base station, and duplex communication is performed by using one frequency each for forward transmission and reverse transmission; and the duplex communication uses a fundamental frequency and harmonics for information transmission. A process of the information transmission is as follows: different information is firstly 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 to obtain all the information transmitted. The present invention makes full use of the ability of harmonics to transmit information, greatly improving the utilization rate of the frequency spectrum, and also greatly increasing the capacity of communication users under the same carrier frequency simultaneously.
    公开号:NL2026742A
    申请号:NL2026742
    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:

    CODE 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 code division multiple access communication method based on harmonic modulation technology. Technical background The frequency band allocation in China is an administrative division, which is different from the comparative market dominance. In Europe and the United States, the frequency band is used for auction. For example, in the 3G era, three major operators in China have already administratively divided for the corresponding frequency bands. The rest are to compete by their services, and European and American operators are not so happy. They first have to take licenses for this frequency band. For example, UK's 3G frequency spectrum auctioned 22 billion pounds, and Germany's 3G frequency spectrum auctioned 45 billion dollars. It can be called as a sky-high price. Why is the frequency spectrum so expensive This is because the currently available frequency spectrum resources are limited. It is known that signals are transmitted in the form of waves. Then, the wavelength is related to the speed of light and the frequency. High frequencies have a strong ability to penetrate the atmosphere, but their diffraction ability (that is, the ability to bypass obstacles during transmission) is relatively weak. However, in the process of wave transmission, in the absence of obstacles, namely, the air being a medium, the waves must have sufficient penetration ability. In addition, if the frequency is too high, the corresponding diffraction ability is insufficient. In high-rise cities, it is difficult to prevent signal degradation and others. Thus, the available frequency bands are not many themselves in wireless signal transmission.
    In addition, satellites, radios, and televisions all need to be transmitted in the form of waves. Of course, they also occupy certain frequency bands. Naturally available frequency bands are even scarcer. Therefore, each country appears to be very "parsimonious” in treating the scarce frequency spectrum. Thus, how to make more users use the limited frequency spectrum resources becomes an important subject of communication research.
    However, in a conventional CDMA communication method as shown in Fig. 1, the division of user signals is implemented by using mutually orthogonal address code sequences. There are as many orthogonal code sequences in the address code set as there are users who can communicate on one carrier at the same time. In this way, a great waste of frequency spectrum resources will be undoubtedly caused. This is because in the conventional CDMA communication method, only the fundamental frequency is used for communication, and the function of harmonic components is ignored. In real life, harmonic components can also be used to transmit information, especially under the circumstances that the frequency spectrum resources are so tight today and it is even more important to make full use of harmonic components so that the frequency spectrum resources can exert their maximum effectiveness.
    Summary of the invention An objective of the present invention is to overcome the shortcomings of the prior art and provide a code division multiple access communication method based on 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 code division multiple access communication method based on a harmonic modulation technology, wherein user signals are divided by using mutually orthogonal address code sequences, information transmission between users is forwarded and controlled by a base station, and duplex communication is performed by using one frequency each for forward transmission and reverse transmission; and the duplex communication uses 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 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 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: Vour = Qofo + dzf2 + asfs + asfy + asfs + + anf (1) where a, represents a n-th harmonic coefficient, n= 0, 2, 3, 4, ...; f, 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: Vet =d ta Pf +a,Pfi + agf + agl fy + (2) Vour = 2a" fo + a3” fs + as” fs + a," f7 + ag"fy + (3) finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Vor = ao" fo tal jo +a’ fa + as’ fs + af fy + as’ fs + asl fo + a; f5 + ag fs + ag’ fo +" (4) it can be known from (1) and (4) that: ap” fo + ag fo = dof (5) GP = af ad fu = auf ag fo = asfes ag fo = asf © (6)
    a3"f3 = asf3a5"fs = asf5; 07" f7 = a5 [7,057 fs = dof 3 (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: + 1 a" fo = a fo = 7 ofo (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 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, uses harmonics to transmit information, and achieves communication with N different users through each harmonic component or component combination (where N is the number of orthogonal code sequences), making full use of the ability of harmonics to transmit information, greatly improving the utilization rate of the frequency spectrum, and also greatly increasing the capacity of communication users at the same carrier frequency simultaneously.
    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 code division multiple access communication method; 5 Fig. 2 is a working schematic diagram of a code 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 code division multiple access communication method based on a harmonic modulation technology, which is specifically as follows: User signals are divided by using mutually orthogonal address code sequences, information transmission between users is forwarded and controlled by a base station, and duplex communication is performed by using one frequency each for forward transmission and reverse transmission; and the duplex communication uses 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 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 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): Vout = Qofo + O2f2 + aafs + agfy +agfs + + On 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 =a fo + aP fo + a,Pf, + af fo + agPfg + (2) Vour = "fo + a3’ fz + as" fs + a;"f7 + ag” fo + + (3) finally, a mixed signal of the first signal and the second signal received simultaneously at the signal receiving end is: Vour = "fo + ag’ fo + a2P fr + as’ fa + al fu + as’ fs + asl fo + a; f7 + agP fg + as” fo + (4)
    it can be known from (1) and (4) that: ao” fo + ao’ fo = dofo (5) off; af = afs a6 fo = Gefeiast fs = Osfs in (6)
    a fs = Wf as fs = asfs; 47 fy = ar fri ad fs = aofy 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: ao’ fo = CoP fo = “tof (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 loads information separately on different harmonic components or component combinations, uses harmonics to transmit information, and achieves communication with N different users through seach harmonic component or component combination (where N is the number of orthogonal code sequences), so that the number of communicable users increases sharply, effectively reducing the situation of fewer communication channels and tight frequency spectrum resources.
    It is foreseeable that in the 5G era, mobile data traffic will show an explosive growth, and the amount of frequency spectrum required will also far exceed the sum of previous generations of mobile communication technologies.
    Therefore, the significance of the CDMA communication method based on the harmonic modulation technology is self-
    evident.
    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. Multiple access code division communication method based on a harmonic modulation technology, characterized in that user signals are divided by using mutual orthogonal address code sequences, information transmission between users is forwarded and controlled by a base station, and duplex communication is performed by using a single frequency use per forward and reverse transmission; and wherein the duplex communication uses a fundamental frequency and harmony for information transmission.
    [2]
    A code division multiple access communication method based on a harmonic modulation technology according to claim 1, characterized in that an information transmission process is as follows: different information is first modulated and then loaded separately on different harmonic components, and finally fundamental frequency and harmonic information received by a receiving end demodulated to obtain all transmitted information.
    [3]
    A code 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, whereby a desired signal is demodulated relative to other signals.
    [4]
    A code 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 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:
    Vout = Qofo + daf + afz + asfy + asfs + + anf (1) where a, represents an nth harmonic coefficient, with n=0, 2, 3, 4 ...; fy 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:
    Vaut = a fo + Pf + a fi + ast fe + ag fz +" (2) Vour = "fo + as fz + 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 corresponds to: Vour = ao' fot acl fo + alpha + as" fs + ab fu + as'fs + as' fo + a;"f; + ag fo + ay' fo + ce (4) it is known from (1) and (4) that: ao' fo + ao fo = dofo (5)
    a' fo = ay fosaP fu = asf dg fs = agfsi ag' fo = agfs + (6) as' fz = asf a5" fs = asfs; 0," fr = a;f7;dg"fs = dofg ; (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: ao' fo = GoPfo = “dof (8)
    so that according to formulas (6)-(8), the receiving end can demodulate the first signal as well as the second signal.
    [5]
    A code 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 to {10 need.
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    同族专利:
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN201911279167.5A|CN111030777A|2019-12-13|2019-12-13|CDMA communication method based on harmonic modulation technology|
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