CN107888534A - A kind of wireless rail angular momentum multiple access system - Google Patents
A kind of wireless rail angular momentum multiple access system Download PDFInfo
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- CN107888534A CN107888534A CN201711055462.3A CN201711055462A CN107888534A CN 107888534 A CN107888534 A CN 107888534A CN 201711055462 A CN201711055462 A CN 201711055462A CN 107888534 A CN107888534 A CN 107888534A
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- oam
- mrow
- user data
- ripples
- multiple access
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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
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
-
- 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
- H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
The invention discloses a kind of wireless rail angular momentum multiple access system, belong to wireless communication technology field, including N number of OFDM modulation modules, N number of OFDM demodulation module, N number of OAM generators and N number of OAM receivers, N >=2, OFDM modulation modules, for receiving multiple user data, and the user data after multiple user data are modulated is modulated, transmitted to OAM generators；OAM generators, for receiving the user data after modulating, OAM ripples are produced, are launched to OAM receivers；OAM receivers, for receiving OAM ripples, OAM ripples are changed into plane wave, transmitted to OFDM demodulation module；OFDM demodulation module, for receiving plane ripple, demodulate the user data after plane wave is demodulated.The present invention provides a brand-new dimension for wireless communication system, can reach the effect of lifting performance in wireless communication systems.
Description
Technical field
The invention belongs to wireless communication technology field, and system is accessed more particularly, to a kind of wireless rail angular momentum multiple access
System.
Background technology
The technical characteristics of following 5G wireless-transmission networks include low time delay, highly reliable, low-power consumption and magnanimity access.
As the key technology in wireless-transmission network, conventional multiple access technique has a frequency division multiple access, time division multiple acess, CDMA with
And the technology such as OFDM.These common multiple access techniques make use of the time, and the dimension such as space and frequency improves
The performance of wireless transmitting system such as traffic rate, channel capacity and the availability of frequency spectrum etc., but with the gradual increasing of digital device
More and multimedia service continuous development, these multiple access techniques can not meet the requirement of 5G systems.
In addition, although MIMO technique is the extraction of MIMO technology so that the spectrum utilization of wireless communication system
Rate is effectively improved, but this can not still meet in following 5G systems the needs of magnanimity access and high-speed transfer.
As can be seen here, there is the availability of frequency spectrum and the relatively low technical problem of channel capacity in prior art.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of wireless rail angular momentum multiple access to connect
Enter system, thus solve the availability of frequency spectrum and the relatively low technical problem of channel capacity.
To achieve the above object, the invention provides a kind of wireless rail angular momentum multiple access system, including N number of OFDM
(Orthogonal Frequency Division Multiplexing, OFDM) modulation module, N number of OFDM demodulation
Module, N number of OAM (Orbital Angular Momentum, orbital angular momentum) generators and N number of OAM receivers, N >=2,
OFDM modulation modules, for receiving multiple user data, and modulate the user after multiple user data are modulated
Data, transmit to OAM generators；
OAM generators, for receiving the user data after modulating, OAM ripples are produced, are launched to OAM receivers；
OAM receivers, for receiving OAM ripples, OAM ripples are changed into plane wave, transmitted to OFDM demodulation module；
OFDM demodulation module, for receiving plane ripple, demodulate the user data after plane wave is demodulated.
Further, N number of OFDM modulation modules have identical sub-carrier frequencies and number of subcarriers.
Further, OAM generators are UCA (Uniform Circular Array, Homogeneous Circular array), SPP
(Spiral Phase Plate, helical phase disk) or circular traveling-wave OAM antennas (circulation traveling wave
OAM antennas, circular traveling-wave OAM antenna).
Further, OAM receivers are UCA or SPP.
Further, the user data after modulation is：
Wherein, si(t) user data of i-th of OFDM modulation module after t modulation, d are representedi(k, t) represents i-th
The user data that k-th of subcarrier of individual OFDM modulation modules receives in t, j expressions imaginary unit, 1≤k≤K, 1≤i≤
N。
Further, OAM ripples are：
Wherein,Represent OAM ripples caused by i-th of OAM generator, liThe state value of OAM ripples is represented,Represent OAM ripples
Deflection.
Further, plane wave is：
Wherein, ri(t) plane wave after i-th of OAM receivers conversion is represented.
Further, the user data after demodulation is：
Wherein,Represent that k-th of subcarrier of i-th of OFDM demodulation module is solved in t demodulation plane wave
User data after tune.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
Electromagnetic wave not only with linear momentum also with angular momentum, wherein, angular momentum is divided into rotational momentum and track angle again
Momentum, rotational momentum is relevant with polarization of electromagnetic wave, has vertically and horizontally two states, and orbital angular momentum and electromagnetic wave
Spatial distribution it is relevant, there is numerous state, the state of orbital angular momentum is referred to as OAM state.OAM state can be
Arbitrary integer.OAM state OAM ripples are not referred to as 0 electromagnetic wave.Unlike common plane wave, the wavefront tool of OAM ripples
There is screw type distribution, and energy is concentrated in an annulus of emission shaft, the local energy close to emission shaft is almost
0.OAM ripples with different OAM state are orthogonal, the present invention by introducing the oam state of OAM ripples this new dimension,
So as to for wireless communication technology provide one it is new using dimension.It is real by the way that orbital angular momentum is combined with OFDM technology
A kind of existing wireless rail angular momentum multiple access system, the effective availability of frequency spectrum for lifting wireless communication system and multiple access access
System channel capacity.
Brief description of the drawings
Fig. 1 is wireless rail angular momentum multiple access system model schematic provided in an embodiment of the present invention；
Fig. 2 is the implementing procedure of wireless rail angular momentum multiple access system provided in an embodiment of the present invention；
Fig. 3 is the three dimensions schematic diagram of wireless rail angular momentum multiple access system provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
It is wireless rail angular momentum multiple access system model schematic shown in Fig. 1；Including N number of OFDM modulation modules, N
Individual OFDM demodulation module, N number of OAM generators and N number of OAM receivers, N >=2,
OFDM modulation modules, for receiving multiple user data, and modulate the user after multiple user data are modulated
Data, transmit to OAM generators；
OAM generators, for receiving the user data after modulating, OAM ripples are produced, are launched to OAM receivers；
OAM receivers, for receiving OAM ripples, OAM ripples are changed into plane wave, transmitted to OFDM demodulation module；
OFDM demodulation module, for receiving plane ripple, demodulate the user data after plane wave is demodulated.
Each OFDM modulation modules have identical sub-carrier frequencies and number of subcarriers, the son of each OFDM modulation modules
Number of carrier wave is K；The data of modulation on time t, k-th of subcarrier of i-th of OFDM modulation module are di(k, t), warp
The data that i-th of OAM generator is transferred to after i-th of OFDM modules modulation are si(t), through i-th of OAM generators transmitting
OAM ripples areIn embodiment, note, in time t, the OAM ripples that i-th of OAM receiver receives areI-th of OFDM
The data that demodulation module receives after the OAM receivers conversion are ri(t), at it after i-th of OFDM demodulation module demodulates
Data after the demodulation obtained on k-th of subcarrier are
OAM generators are UCA, SPP or circular traveling-wave OAM antennas.
Wherein, UCA is made up of multiple array elements being evenly distributed on circular array, is transferred to the multiple signals of multiple array elements
Same input both is from, but before antenna is entered, multiple signals each have passed through a phase shifter, be superimposed a phase
Position.If expect the OAM ripples that OAM state are l, the Signal averaging of i-th of antennaPhase, herein, NtFor group
Into UCA element number of array.So pass through all antenna superpositions of one week, the π of total phase place change l × 2.Finally launch from UCA
The electromagnetic wave gone out, exactly can be approximately with the OAM ripples that OAM state are l.
SPP is a disc-shaped device with helical form outward appearance.Due to SPP each several parts when rotating a circle thickness not
Together, therefore plane wave can have helicity in the phase perpendicular to the direction of propagation after plane electromagnetic wave passes through SPP, turn into
OAM ripples.
Circular traveling-wave OAM antennas utilize CLA (circulation loop antenna, Circular loop
Antennas) produce and launch OAM ripples.
OAM receivers are UCA or SPP.
Shown in Fig. 2, it is the implementing procedure figure of wireless rail angular momentum multiple access system in embodiment, specifically includes as follows
Step：
A. user data modulation step：The data of multiple users are modulated by the individual OFDM modulation modules of N (N >=2),
User data after i-th of OFDM module is modulated can be expressed as：
B.OAM ripple step of transmitting：N number of OAM ripples with different oam states are launched by the individual OAM generators of N (N >=2),
The OAM generators receive modulates obtained data via the modulation module, and the data are loaded on to the OAM ripples of transmitting
On, the oam state value of the OAM ripples of i-th of OAM generators transmitting is li(liFor arbitrary integer), so as to i-th of OAM generator
The OAM ripples of transmitting are represented by：
C.OAM ripple receiving steps：The OAM ripples launched by OAM generators are received by the individual OAM receivers of N (N >=2), then,
Plane wave after i-th of OAM receiver is received and converted is represented by：
D. user data demodulation step：It will be received using N number of demodulation module by the OAM receivers and convert to obtain puts down
Face ripple demodulates to obtain multiple user data, then i-th (1≤i≤N) individual demodulation module demodulates to obtain the user on k-th of subcarrier
Data are represented by：
It is wireless rail angular momentum multiple access method three dimensions schematic diagram in embodiment shown in Fig. 3：Wherein, x, y, z
Axle represents oam state, time and subcarrier respectively.Each blockage represents a kind of oam state, time in three dimensions schematic diagram
Represented with the combination of subcarrier, such as coordinate (i, j, k) in time tj, the user data on the square is carried in the module
On k-th of subcarrier and the oam state of OAM electromagnetic waves of transmitting is li。
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (8)
1. a kind of wireless rail angular momentum multiple access system, it is characterised in that solved including N number of OFDM modulation modules, N number of OFDM
Mode transfer block, N number of OAM generators and N number of OAM receivers, N >=2,
OFDM modulation modules, for receiving multiple user data, and the user data after multiple user data are modulated is modulated,
Transmit to OAM generators；
OAM generators, for receiving the user data after modulating, OAM ripples are produced, are launched to OAM receivers；
OAM receivers, for receiving OAM ripples, OAM ripples are changed into plane wave, transmitted to OFDM demodulation module；
OFDM demodulation module, for receiving plane ripple, demodulate the user data after plane wave is demodulated.
A kind of 2. wireless rail angular momentum multiple access system as claimed in claim 1, it is characterised in that N number of OFDM
Modulation module has identical sub-carrier frequencies and number of subcarriers.
A kind of 3. wireless rail angular momentum multiple access system as claimed in claim 1 or 2, it is characterised in that the OAM hairs
Raw device is UCA, SPP or circular traveling-wave OAM antennas.
4. a kind of wireless rail angular momentum multiple access system as claimed in claim 1 or 2, it is characterised in that the OAM connects
Receipts device is UCA or SPP.
A kind of 5. wireless rail angular momentum multiple access system as claimed in claim 1 or 2, it is characterised in that the modulation
User data afterwards is：
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Wherein, si(t) user data of i-th of OFDM modulation module after t modulation, d are representedi(k, t) is represented i-th
The user data that k-th of subcarrier of OFDM modulation modules receives in t, j represent imaginary unit, 1≤k≤K, 1≤i≤N.
6. a kind of wireless rail angular momentum multiple access system as claimed in claim 5, it is characterised in that the OAM ripples are：
Wherein,Represent OAM ripples caused by i-th of OAM generator, liThe state value of OAM ripples is represented,Represent the side of OAM ripples
To angle.
A kind of 7. wireless rail angular momentum multiple access system as claimed in claim 6, it is characterised in that the plane wave
For：
Wherein, ri(t) plane wave after i-th of OAM receivers conversion is represented.
8. a kind of wireless rail angular momentum multiple access system as claimed in claim 7, it is characterised in that after the demodulation
User data is：
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Wherein,Represent k-th of subcarrier of i-th of OFDM demodulation module after t demodulation plane wave obtains demodulation
User data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711055462.3A CN107888534A (en) | 2017-10-30 | 2017-10-30 | A kind of wireless rail angular momentum multiple access system |
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| CN201711055462.3A CN107888534A (en) | 2017-10-30 | 2017-10-30 | A kind of wireless rail angular momentum multiple access system |
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| WO2020078473A1 (en) * | 2018-10-19 | 2020-04-23 | Huawei Technologies Co., Ltd. | Pseudo-doppler receiving architecture for oam and mimo transmissions |
| US10707927B2 (en) | 2018-10-19 | 2020-07-07 | Huawei Technologies Co., Ltd. | OAM pseudo-doppler receiving architecture |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020078473A1 (en) * | 2018-10-19 | 2020-04-23 | Huawei Technologies Co., Ltd. | Pseudo-doppler receiving architecture for oam and mimo transmissions |
| US10707927B2 (en) | 2018-10-19 | 2020-07-07 | Huawei Technologies Co., Ltd. | OAM pseudo-doppler receiving architecture |
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| CN110995299A (en) * | 2019-11-01 | 2020-04-10 | 清华大学 | Electromagnetic wave orbital angular momentum transmission method and system based on dimension expansion interference code |
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Application publication date: 20180406 |