CN110855341B - Integrated beam forming and signal modulation method based on digital programmable super surface - Google Patents

Integrated beam forming and signal modulation method based on digital programmable super surface Download PDF

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CN110855341B
CN110855341B CN201911069359.3A CN201911069359A CN110855341B CN 110855341 B CN110855341 B CN 110855341B CN 201911069359 A CN201911069359 A CN 201911069359A CN 110855341 B CN110855341 B CN 110855341B
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digital programmable
super surface
modulation
programmable super
codes
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CN110855341A (en
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万向
崔铁军
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Southeast University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

The invention discloses an integrated beam forming and signal modulation method based on a digital programmable super surface, which completes beam forming by controlling the distribution of the oral surface code of the digital programmable super surface on the space, wherein the oral surface code is formed by combining different states of all super surface units in the digital programmable super surface; and the modulation of the signal is completed by controlling the switching sequence of different face codes on time.

Description

Integrated beam forming and signal modulation method based on digital programmable super surface
Technical Field
The invention relates to the technical field of signal modulation, in particular to an integrated beamforming and signal modulation technical method based on a digital programmable super surface.
Background
In conventional radio subsystems, the modulation of signals and the beam steering of electromagnetic waves are done by different modules. Generally, the modulation of the signal is done in the baseband part, while the beam steering of the electromagnetic waves is done in the radio frequency part.
Disclosure of Invention
The invention aims to provide an integrated signal modulation and beam control technology based on a digital programmable super surface, which simplifies the traditional communication architecture and greatly improves the flexibility of the system.
The technical scheme is as follows: an integrated beam forming and signal modulation method based on a digital programmable super surface comprises the following steps:
beam forming is completed by controlling the distribution of the oral surface codes of the digital programmable super surface on the space, wherein the oral surface codes are formed by combining different states of all super surface units in the digital programmable super surface;
and the modulation of the signal is completed by controlling the switching sequence of different face codes on time.
Further, the step of obtaining the orofacial code of the digitally programmable super surface comprises:
defining the far field generated by the digital programmable super surface as a plane wave, and carrying out Fourier transform on the far field
Figure BDA0002260464220000011
Obtaining a mouth-face field of the digital programmable super surface;
dispersing the obtained oral surface field of the digital programmable super surface to obtain oral surface codes;
in the formula (I), the compound is shown in the specification,
Figure BDA0002260464220000012
representing the designated far-field,
Figure BDA0002260464220000013
representing the modulation term, alpha represents the amplitude modulation,
Figure BDA0002260464220000014
representing phase modulation.
Further, the step 2 specifically comprises: by adjusting
Figure BDA0002260464220000015
Controls the beam phase.
Further, the far field generated by the digitally programmable super surface is defined as a directional plane wave:
Figure BDA0002260464220000016
the beam phase of which is specified
Figure BDA0002260464220000017
And the phase modulation of the directional beam and the beam is completed.
Further, the far field generated by the digitally programmable super-surface is defined as two plane waves pointing in different directions:
Figure BDA0002260464220000018
specifying
Figure BDA0002260464220000019
And
Figure BDA00022604642200000110
the values of (a) and (b) control the phases of the two beams independently, respectively, to accomplish independent modulation of the dual directional beams and the phases of the different beams.
Has the beneficial effects that: compared with the prior art, the invention realizes integrated beam forming and signal modulation by controlling the distribution of the digital programmable super-surface orofacial codes on space and the switching sequence of time, simplifies the traditional communication architecture, greatly improves the flexibility of the system, promotes the multifunctional, integrated and intelligent development of the current information system, and has innovative application prospect.
Drawings
FIG. 1 is a schematic diagram of a digitally programmable super surface;
FIG. 2 is a schematic diagram of the directional beam and the phase modulation of the beam of example 1;
fig. 3 is the dual directional beam and independent modulation of the phases of the different beams of embodiment 2.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
The invention provides an integrated signal modulation and beam control technology based on a digital programmable super surface. Specifically, beam control is realized by designing a digital super-surface mouth-face code; meanwhile, different face codes are switched in the time domain, and the modulation of signals can be realized. Based on the technology disclosed by the invention, the integration of signal modulation and beam control can be realized, so that the traditional communication architecture is simplified, the flexibility of the system is greatly improved, and the method has innovative application prospect.
Fig. 1 is a schematic diagram of a programmable super-surface, in which each small square represents a super-surface unit, different colors represent different states of the units, different states of all the super-surface units are combined to form a face-to-face code of the super-surface unit, and integrated signal modulation and beam control can be realized by designing spatial distribution of the codes and a time switching sequence.
Far field of an oral surface according to the Huygens-Fresnel diffraction theorem
Figure BDA0002260464220000021
Can be controlled by the oral surface near field
Figure BDA0002260464220000022
Is obtained by inverse fourier transform. Programmable super-surface aperture field due to digitalizationIs digitally discrete, and thus the orofacial field can be denoted as U (m Δ x, n Δ y, k Δ t), where m Δ x and n Δ y represent the coordinates of the unit on the orofacial surface and k Δ t represents the time at which the orofacial code is located. For simplicity, the orofacial field is further denoted as U (m, n, k) and its corresponding far field is denoted as U (m, n, k)
Figure BDA0002260464220000023
If the far field is specified in advance, the oral surface field can be transformed by Fourier transform of the far field
Figure BDA0002260464220000024
Is obtained in which
Figure BDA0002260464220000025
Representing the fourier transform. And dispersing the orofacial field to obtain the orofacial code corresponding to the far place. On the other hand, a modulation term is added to the expression for specifying the far field
Figure BDA0002260464220000026
Wherein, alpha represents the amplitude modulation,
Figure BDA0002260464220000027
representing phase modulation, the far field at that time corresponds to the face code
Figure BDA0002260464220000028
Thus obtaining the product. The far-field patterns corresponding to the two kinds of face-to-face codes are the same, but the amplitudes and phases of the far-field patterns are different, and if the two kinds of codes are switched according to a certain time sequence in time, the basis of signal modulation is formed. In summary, by designing the spatial distribution and the time switching sequence of the interface coding, the integrated beamforming and signal modulation can be realized.
Example 1:
single beam and signal modulation
The present embodiment utilizes a digitally programmable super-surface to simultaneously achieve directional beam and phase modulation of the beam. Defining the far field function of the super-surface as a directional plane wave:
Figure BDA0002260464220000029
the beam phase of which can be specified
Figure BDA00022604642200000210
Is controlled by the value of (c).
Let the beam point (θ =45 °,
Figure BDA00022604642200000211
) (ii) a At the same time order
Figure BDA00022604642200000212
Increasing from 0 to 3 pi/2 in steps of pi/2. According to the introduction of the theory part, the orofacial codes corresponding to four situations can be calculated, and a in fig. 2 gives the calculation coding result. When in use
Figure BDA00022604642200000213
In the time, the far field calculated by using the orofacial code is shown as d in fig. 2, the bright point represents the far field main beam generated by the super-surface, and the effectiveness of the code is verified. G in FIG. 2 is when
Figure BDA00022604642200000214
The far field test results in four cases, increasing from 0 to 3 pi/2 in steps of pi/2, are seen from the test results, although
Figure BDA00022604642200000215
But the far field pattern remains substantially the same. J in fig. 2 is the phase of the main beam tested in four cases, and it can be seen from the figure that the phase of the main beam is compared with that of the main beam
Figure BDA00022604642200000216
Linear, consistent with the expected results.
Let the beam be pointed at (θ =0 °,
Figure BDA0002260464220000031
) And order
Figure BDA0002260464220000032
Increasing from 0 to 3 pi/2 in steps of pi/2. The orofacial code of the super surface is shown as b in fig. 2; when in use
Figure BDA0002260464220000033
In the process, the far field calculated by using the orofacial coding is shown as e in fig. 2, the bright spot represents the far field main beam generated by the super-surface, and the coding effectiveness is verified. H in FIG. 2 is
Figure BDA0002260464220000034
The far field test results in four cases, increasing from 0 to 3 pi/2 in steps of pi/2, are seen from the test results, although
Figure BDA0002260464220000035
But the far field pattern remains substantially the same. K in fig. 2 is the phase of the main beam tested in four cases, and it can be seen from the figure that the phase of the main beam is equal to that of the main beam
Figure BDA0002260464220000036
Linear, consistent with the expected results.
Let the beam point at (theta = -45 deg.,
Figure BDA0002260464220000037
) And order
Figure BDA0002260464220000038
Increasing from 0 to 3 pi/2 in steps of pi/2. The orofacial code of the super-surface is shown as c in fig. 2; when in use
Figure BDA0002260464220000039
In the time, the far field calculated by using the orofacial code is shown as f in fig. 2, the bright point represents the far field main beam generated by the super-surface, and the effectiveness of the code is verified. I in FIG. 2 is when
Figure BDA00022604642200000310
When the step of pi/2 is increased from 0 to 3 pi/2The far field test results in four cases, as can be seen from the test results, although
Figure BDA00022604642200000311
But the far field pattern remains substantially the same. The l in fig. 2 is the phase of the main beam tested in four cases, and it can be seen from the figure that the phase of the main beam is equal to that of the main beam
Figure BDA00022604642200000312
Linear, consistent with the expected results.
Example 2:
dual beam and independent signal modulation
The present embodiment utilizes a digitally programmable super-surface to simultaneously achieve dual directional beams and independent modulation of different beam phases. Defining the far field generated by the super surface as two plane waves pointing in different directions:
Figure BDA00022604642200000313
from the far field expression, it can be seen that the phases of the two beams can be specified
Figure BDA00022604642200000314
And
Figure BDA00022604642200000315
are independently controlled.
Let the beam pointing be: (theta. Providing a sufficient balance between the values 1 ＝10°,
Figure BDA00022604642200000316
),(θ 2 ＝-30°,
Figure BDA00022604642200000317
) And make an order
Figure BDA00022604642200000318
And
Figure BDA00022604642200000319
are all zero, a in figure 3 givesA far-field pattern computed from the orofacial code. And calculating and displaying that the two main lobes point to a given direction, and verifying the validity of the super-surface coding.
Let the beam pointing be: (theta. Providing a sufficient balance between the values 1 ＝33°,
Figure BDA00022604642200000320
),(θ 2 ＝29°,
Figure BDA00022604642200000321
) And make an order
Figure BDA00022604642200000322
And
Figure BDA00022604642200000323
all are zero, and b in fig. 3 gives the far-field pattern calculated from the orofacial code. And calculating and displaying that the two main lobes point to a given direction, and verifying the validity of the super-surface coding.
Let the beam pointing be: (theta) 1 ＝25°,
Figure BDA00022604642200000324
),(θ 2 ＝28°,
Figure BDA00022604642200000325
) And make an order
Figure BDA00022604642200000326
And
Figure BDA00022604642200000327
all are zero and c in fig. 3 gives the far field pattern calculated from the orofacial code. And calculating and displaying that the two main lobes point to a given direction, and verifying the validity of the super-surface coding.
Let the beam pointing be: (theta. Providing a sufficient balance between the values 1 ＝43°,
Figure BDA00022604642200000328
),(θ 2 ＝30°,
Figure BDA00022604642200000329
) And make an order
Figure BDA00022604642200000330
And
Figure BDA00022604642200000331
all are zero and d in fig. 3 gives the far field pattern calculated from the orofacial code. And calculating and displaying that the two main lobes point to a given direction, and verifying the validity of the super-surface coding.
On the other hand, in order to verify the independent regulation capability of the digitized super-surface on the phases of different beams, different phase values are respectively assigned to the two beams in a in fig. 3, and the far-field patterns and phases thereof are tested.
First, let
Figure BDA00022604642200000332
Figure BDA00022604642200000333
Increasing from 0 to 3 pi/2 in steps of pi/2. The far field test results for the four cases are given in fig. 3, from which it can be seen that the patterns remain substantially the same despite the different phases of the beams. I in fig. 3 is the corresponding far field phase test result, from which it can be seen that the phase of the first beam remains fixed, while the phase of the second beam is stepped by pi/2, consistent with the expected result.
Order to
Figure BDA0002260464220000041
Figure BDA0002260464220000042
Increasing from 0 to 3 pi/2 in steps of pi/2. The far field test results for the four cases are given in f of fig. 3, from which it can be seen that the patterns remain substantially uniform despite the different phases of the beams. J in FIG. 3 is the corresponding far-field phase test result, from which the first wave can be seenThe phase of the beam is increased by pi/2 and remains fixed, while the phase of the second beam is stepped by pi/2, consistent with the expected results.
Order to
Figure BDA0002260464220000043
Figure BDA0002260464220000044
Increasing from 0 to 3 pi/2 in steps of pi/2. The far field test results for the four cases are given in g in fig. 3, from which it can be seen that the patterns remain substantially uniform despite the different phases of the beams. K in fig. 3 is the corresponding far field phase test result, from which it can be seen that the phase of the first beam is increased by pi/2 and remains fixed, while the phase of the second beam is stepped by pi/2, consistent with the expected result.
Order to
Figure BDA0002260464220000045
Figure BDA0002260464220000046
Increasing from 0 to 3 pi/2 in steps of pi/2. The far field test results for the four cases are given by h in fig. 3, from which it can be seen that the patterns remain substantially uniform despite the different phases of the beams. The corresponding far field phase test results are shown as l in fig. 3, from which it can be seen that the phase of the first beam is increased by pi/2 and remains fixed, while the phase of the second beam is stepped by pi/2, consistent with the expected results.

Claims (4)

1. An integrated beam forming and signal modulation method based on a digital programmable super surface is characterized in that: the method comprises the following steps:
beam forming is completed by controlling the distribution of the oral surface codes of the digital programmable super surface on the space, wherein the oral surface codes are formed by combining different states of all super surface units in the digital programmable super surface;
the modulation of signals is completed by controlling the switching sequence of different face codes on time;
the acquisition step of the orofacial code of the digital programmable super surface comprises the following steps:
defining a far field generated by the digital programmable super surface as a plane wave, and carrying out Fourier transform on the far field
Figure FDA0003836293050000011
Obtaining a mouth-face field of the digital programmable super surface;
dispersing the obtained oral surface field of the digital programmable super surface to obtain oral surface codes;
in the formula (I), the compound is shown in the specification,
Figure FDA0003836293050000012
representing the designated far-field,
Figure FDA0003836293050000013
representing the modulation term, alpha represents the amplitude modulation,
Figure FDA0003836293050000014
representing phase modulation.
2. The integrated beamforming and signal modulation method based on the digital programmable super surface according to claim 1, wherein: the modulation of the signal is completed by controlling the switching sequence of different orofacial codes on time, which specifically comprises the following steps:
by adjusting
Figure FDA0003836293050000015
The value of (4) controls the wave beam phase to obtain different orofacial codes;
and the modulation of the signal is completed by controlling the switching sequence of different face codes on time.
3. The integrated beamforming and signal modulation method based on the digital programmable super surface of claim 2, wherein:defining the far field generated by the digital programmable super surface as a directional plane wave:
Figure FDA0003836293050000016
the beam phase of which is specified
Figure FDA0003836293050000017
And the phase modulation of the directional beam and the beam is completed.
4. The integrated beamforming and signal modulation method based on the digital programmable super surface according to claim 2, wherein: the far field generated by the digitally programmable super-surface is defined as two plane waves pointing in different directions:
Figure FDA0003836293050000018
specifying
Figure FDA0003836293050000019
And
Figure FDA00038362930500000110
respectively, to independently control the phases of the two beams, thereby completing independent modulation of the dual directional beam and the phases of the different beams.
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CN111478030B (en) * 2020-04-07 2023-09-19 东南大学 Reconfigurable sum and difference beam forming system and method
CN111542054B (en) * 2020-05-08 2023-01-06 南京大学 Secure communication method and system based on programmable super surface
CN112910531B (en) * 2021-04-15 2022-06-03 东南大学 User tracking and wireless digital transmission method based on programmable super surface
CN113109811B (en) * 2021-04-15 2023-11-24 东南大学 Two-phase coding one-dimensional distance imaging method based on programmable super surface

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