CN101335552A - A smart antenna implementation method and device for strip coverage - Google Patents

Abstract

The invention discloses a method for realizing a strip-covered smart antenna. The smart antenna adopts a double-radiating surface line array. The beam pointing and beam width; according to the beam pointing and beam width generating beamforming weight vector; according to the beamforming weight vector on the transmission data of the double radiation surface of the dual radiation surface linear array to perform downlink beamforming, which The shape-forming pattern satisfies a symmetric or approximately symmetric relationship. Correspondingly, the present invention also provides a smart antenna implementation device for strip coverage. Thereby, the present invention can reduce the number of base stations, network construction cost and switching frequency to a certain extent, thereby improving the network performance of the strip coverage of the smart antenna system.

Description

A smart antenna implementation method and device for strip coverage

technical field

The invention relates to the field of wireless communication, in particular to a method and device for implementing a smart antenna suitable for strip coverage.

Background technique

In the smart antenna system, the base station antenna is usually an array antenna. The communication system uses beamforming (also known as beamforming) technology, that is, according to the spatial characteristics of signal transmission, through spatial digital signal processing, it realizes shaping weight vector estimation or downlink beamforming. Forming, so as to achieve the purpose of reducing interference, increasing capacity, expanding coverage, improving communication quality, reducing transmission power and increasing wireless data transmission rate.

In practical applications, considering the influence of factors such as the spatial distribution of communication system business load and the cost of base station construction, the coverage of some base stations may have certain particularities. For strip coverage, it is usually suitable for coverage along the traffic line of the marginal network, that is, the base station antenna is erected next to the traffic line in linear areas such as roads, railways, and waterways. The traffic volume in the strip coverage area is low, and the mobile speed of user terminals is high. , switching frequently. In most cases, the radiation surface of the array antenna of the smart antenna system has a certain directivity, which can be called a single radiation surface. For a linear antenna array (referred to as a linear array), since the direction of each single antenna pattern is basically the same as that of the linear array radiation surface The normal direction of the line array is consistent, so the coverage of the line array can be considered as one side of the normal direction of the radiation surface, and the other side of the opposite direction is covered by the corresponding other base station, which may make the base station within a certain coverage area The increase in the number will increase the cost of network construction, and may increase the number of handovers when the user terminal moves, resulting in a decrease in call quality and reliability.

Chinese patent application CN200510076683 (publication number: CN1882157, publication date: December 20, 2006) discloses a smart antenna beamforming method for group coverage, which preselects and stores a variety of different beams; Calculate the distribution range of multicast users according to the wave direction; select the stored beam according to the distribution range of multicast users to realize beamforming. At the same time, this patent application also provides a smart antenna beamforming device for group coverage, including: a beam storage unit, a multicast user distribution range acquisition unit, and a beamforming unit, which can make each beam cover all groups Broadcast users, save code channel resources, and reduce interference between different users. However, the technology of this patent application does not improve the network performance of the strip coverage of the smart antenna system.

To sum up, it can be seen that the existing strip-coverage smart antenna technology obviously has inconveniences and defects in actual use, so it is necessary to improve it.

Contents of the invention

In view of the above-mentioned defects, the object of the present invention is to provide a strip coverage smart antenna implementation method and device, which can reduce the number of base stations, network construction costs and switching frequency, thereby improving the network performance of the strip coverage of the smart antenna system.

In order to achieve the above object, the present invention provides a method for implementing a strip-covered smart antenna, the smart antenna adopts a double-radiating surface line array, and the method includes the following steps:

A. According to the requirements of strip coverage, determine the corresponding beam pointing and beam width for any radiating surface of the dual-radiating surface linear array;

B. Generate a beamforming weight vector according to the beam pointing and beam width;

C. Perform downlink beamforming on the transmission data of the dual radiating surfaces of the dual radiating surface linear array according to the beamforming weight vector, and the forming pattern satisfies a symmetrical or approximately symmetrical relationship.

According to the method of the present invention, the beamwidth is equal to the service beamwidth of the array antenna, and the beamforming weight vector in the step B is a steering vector, and the calculation formula of the beamforming weight vector w is:

$\mathrm{<span\; class="notranslate">\; w</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

γ _k (θ)=j2π(k-1)Dsinθ/λ, k=1, 2, ..., M (2)

In formulas (1) and (2), [·] ^T represents the transpose operation, a(θ) is the steering vector, D represents the antenna spacing, λ represents the carrier wavelength, and M is the number of antennas.

According to the method of the present invention, the beam width is larger than the service beam width of the array antenna, and in the step B, a beamforming weight vector meeting the requirements is generated according to the beam pointing and the beam width.

According to the method of the present invention, in the step B, the method of window function weighting, spatial filter design, global optimal search or local quasi-optimal search is used to generate beamforming weight vectors that meet the requirements.

According to the method of the present invention, in the step C, the downlink transmit baseband data is subjected to downlink beamforming processing according to the beamforming weight vector, and the calculation formula of the downlink beamforming output y is:

y=w ^H x (3)

In formula (3), [·] ^H represents the conjugate transpose operation, w is the beamforming vector, and x is the downlink transmit baseband data vector.

According to the method of the present invention, the beamforming pattern output by the beamforming in the step C and the transmitting signal direction take the manifold direction of the antenna array as the axis, and satisfy a geometric symmetry or approximately symmetry relationship.

According to the method of the present invention, further comprising after the step C:

D. Perform signal processing on the downlink transmission baseband shaped data to obtain radio frequency signals that meet the transmission requirements;

E. Transmitting the wireless radio frequency signal through a double-radiating surface array.

According to the method of the present invention, in the step D, digital-to-analog conversion, up-conversion, filtering and/or power amplification are performed on the downlink transmission baseband shaped data, so as to obtain radio frequency signals that meet transmission requirements.

The present invention also provides a strip-covered smart antenna implementation device, the smart antenna adopts a double-radiating surface line array, and the device includes:

The shaping weight vector generation unit is used to determine the beam pointing and beam width for any radiation surface of the dual radiation surface linear array according to the requirements of strip coverage, so as to generate the corresponding beam forming weight vector;

The beamforming unit is configured to perform downlink beamforming on the transmission data of the dual radiating surfaces of the dual radiating surface linear array according to the beamforming weight vector, and its forming pattern satisfies a symmetrical or approximately symmetrical relationship.

The device of the present invention further comprises:

The multi-channel amplification and transceiver unit is used to perform signal processing on the downlink transmission baseband shaped data to obtain radio frequency signals that meet the transmission requirements;

The dual-radiating surface linear array transmits the wireless radio frequency signal.

The smart antenna of the present invention adopts a double radiating surface linear array, and according to the requirements of strip coverage, the beam pointing and beam width are determined for any radiating surface, and then the beamforming weight vector is generated to realize the downlink beamforming of the transmitted data of the double radiating surface. shape, and the shape-forming pattern satisfies a symmetric or approximately symmetric relationship. Thereby, the present invention can reduce the number of base stations, network construction cost and switching frequency to a certain extent, thereby improving the network performance of the strip coverage of the smart antenna system.

Description of drawings

Fig. 1 is the structural representation of double-radiating surface line array in an embodiment of the present invention;

Fig. 2 is a single-antenna array element pattern of a dual-radiating surface linear array in an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a strip-covered smart antenna implementation device provided by the present invention;

Fig. 4 is the flow chart of the smart antenna implementation method of strip coverage provided by the present invention;

Fig. 5 is a beamforming pattern of an eight-antenna dual-radiating surface linear array in an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The smart antenna system of the present invention adopts a double-radiating surface linear array, that is, a double-radiating surface linear antenna array. Fig. 1 shows a structure of a double-radiating surface linear array, including linearly arranged antennas 1 to M, which are generally arranged in at the base station. Define the direction of the connection line between antenna 1 and antenna M as the direction of the array manifold, the normal directions pointing to 0° and 180° are defined as the positive direction and the reverse direction, respectively, and the corresponding radiation surfaces are called the positive radiation surface and the reverse direction, respectively. radiating surface.

Figure 2 is a single-antenna element pattern of a dual-radiating surface linear array. The single-antenna element pattern points to the positive direction of the 0° normal direction and the opposite direction of the 180° normal direction, and satisfies symmetry or approximation Symmetrical relationship, the array antenna formed in this way has two radiation surfaces, positive and negative, and beamforming is realized based on one radiation surface, and two geometrically symmetrical or approximately symmetrical beamforming beams must be generated simultaneously in the positive and negative directions. shape direction diagram.

Based on the above understanding, the present invention provides a strip coverage smart antenna implementation device, as shown in Figure 3, mainly including a shaping weight vector generation unit 310, a beamforming unit 320, a multi-channel amplification and transceiver unit 330 , double-radiating surface line array 340, wherein:

The shaping weight vector generation unit 310 is used to determine the beam pointing and beam width for any radiation surface of the dual-radiation surface linear array 340 according to the requirements of the strip coverage, for example, according to the characteristics of the direction and angle range of the strip coverage, so as to Generate the corresponding beamforming weight vectors. The so-called beam width is also known as the half-power beam width. Due to the strong directivity of the antenna, its pattern usually has two or more lobes. The lobe with the largest radiation intensity is called the main lobe, and the remaining lobes are called side lobes. . On both sides of the maximum radiation direction of the main lobe, the angle between two points where the radiation intensity is reduced by 3dB (the power density is reduced by half) is defined as the beam width. The narrower the beam width, the better the directivity, the farther the working distance, and the stronger the anti-interference ability.

The beamforming unit 320 is configured to perform downlink beamforming on the transmission data of the dual-radiating surface of the dual-radiating surface linear array 340 according to the beamforming weight vector, that is, based on the shaping weight vector determined by the shaping weight vector generating unit 310 The downlink transmission baseband data of each user terminal is subjected to beamforming processing, and the beamforming pattern satisfies a geometric symmetry or approximately symmetry relationship.

The multi-channel amplification and transceiver unit 330 is used to perform signal processing on the baseband shaped data for downlink transmission to obtain radio frequency signals meeting transmission requirements. The signal processing refers to performing digital-to-analog conversion, up-conversion, filtering, power amplification and other processing on the baseband formed data that has been subjected to downlink beamforming processing to obtain radio frequency signals that meet the transmission requirements.

The double-radiating surface line array 340 is used to transmit the wireless radio frequency signal.

Since the smart antenna of the present invention adopts a double radiating surface line array, the coverage of the base station can be the normal direction of the radiating surfaces on both sides, which avoids the other side of the normal line in the prior art needing to be covered by other base stations. To a certain extent, the number of base stations and the cost of network construction are reduced, and at the same time, the number of handovers when the user terminal moves is reduced, and the quality and reliability of the call are guaranteed, thereby improving the network performance of the strip coverage of the smart antenna system.

The present invention also provides a method for realizing a strip-covered smart antenna. The smart antenna adopts a double-radiating surface line array, as shown in FIG. 4 . The method includes the following steps:

Step S410 , according to the requirements of strip coverage, determine the corresponding beam direction and beam width for any radiation surface of the dual-radiation surface linear array.

In one embodiment of the present invention, the positive radiation surface is used as the benchmark, and according to the requirements of strip coverage, the beam direction is determined to be θ, and the half-power beam width is Ω, where the half-power beam width Ω is not less than the service beam width of the array antenna, that is, half The power beamwidth Ω is greater than or equal to the service beamwidth of the array antenna.

Step S420, generating a beamforming weight vector according to the beam pointing and beam width.

The generation method of described beamforming weight vector comprises multiple:

If the half-power beamwidth Ω is equal to the service beamwidth of the array antenna, the beamforming weight vector is the steering vector. For a linear array, the formula for calculating the beamforming weight vector w is:

$\mathrm{<span\; class="notranslate">\; w</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

γ _k (θ)=j2π(k-1)Dsinθ/λ, k=1, 2, ..., M (2)

In formulas (1) and (2), [·] ^T represents the transpose operation, a(θ) is the steering vector, D represents the antenna spacing, λ represents the carrier wavelength, and M is the number of antennas.

If the half-power beamwidth Ω is greater than the service beamwidth of the array antenna, it needs to be based on the beam pointing θ and the half-power beamwidth Ω, using window function weighting, spatial filter design, global optimal search, local quasi-optimal search and other methods to generate The beamforming weight vector w that meets the requirements, the current search method based on genetic algorithm is one of the commonly used local quasi-optimal search methods.

Step S430 , performing downlink beamforming on the transmission data of the dual radiation surfaces of the dual radiation surface linear array according to the beamforming weight vector, and the beamforming pattern satisfies a symmetrical or approximately symmetrical relationship.

In this step, the downlink beamforming process is performed on the downlink transmit baseband data according to the beamforming weight vector w, and the calculation formula of the downlink beamforming output y is:

y=w ^H x (3)

In formula (3), [·] ^H represents the conjugate transpose operation, and x is the baseband data vector for downlink transmission.

The beamforming pattern of the beamforming output y and the transmitting signal direction take the antenna array manifold direction as the axis, as shown in FIG. 1 , and satisfy geometric symmetry or approximately symmetry relationship.

As a preferred embodiment of the above smart antenna implementation method, it may further include:

Step S440, performing signal processing on the downlink transmission baseband shaped data to obtain a wireless radio frequency signal meeting transmission requirements. The signal processing refers to performing digital-to-analog conversion, up-conversion, filtering, power amplification and other processing on the baseband shaped data to obtain radio frequency signals that meet the transmission requirements.

Step S450, transmitting the wireless radio frequency signal through the dual-radiating surface linear array.

Figure 5 shows the beamforming pattern of the 8-antenna dual-radiating surface linear array in an embodiment of the present invention, the beam directions of the dual-radiating surfaces are 20° and 160° respectively, and the half-power beam widths are both 21°. Hanning (Hanning) window function weighting, the window function expression is:

Obviously, the beamforming pattern and the direction of the transmitted signal satisfy the geometric symmetry or approximate symmetry relationship with the array manifold direction as the axis.

In summary, the smart antenna of the present invention adopts a dual-radiating surface linear array. According to the requirements of strip coverage, the beam pointing and beam width are determined for any radiating surface, and then the beamforming weight vector is generated to realize the emission of the dual-radiating surface. The downlink beamforming of the data, and the forming pattern satisfies a symmetrical or approximately symmetrical relationship. Thereby, the present invention can reduce the number of base stations, network construction cost and switching frequency to a certain extent, thereby improving the network performance of the strip coverage of the smart antenna system.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1, a kind of smart antenna implementation method of strip coverage, described smart antenna adopts double radiation surface line array, it is characterized in that, the method comprises the steps: A. According to the requirements of strip coverage, determine the corresponding beam pointing and beam width for any radiating surface of the dual-radiating surface linear array; B. Generate a beamforming weight vector according to the beam pointing and beam width; C. Perform downlink beamforming on the transmission data of the dual radiating surfaces of the dual radiating surface linear array according to the beamforming weight vector, and the forming pattern satisfies a symmetrical or approximately symmetrical relationship. 2. The method according to claim 1, wherein the beamwidth is equal to the service beamwidth of the array antenna, and the beamforming weight vector in the step B is a steering vector, and the beamforming weight vector w The calculation formula is $\mathrm{<span\; class="notranslate">\; w</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; ]</span>}^{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$ γ _k (θ)=j2π(k-1)Dsinθ/λ, k=1, 2, . . . , M (2) In formulas (1) and (2), [·] ^T represents the transpose operation, a(θ) is the steering vector, D represents the antenna spacing, λ represents the carrier wavelength, and M is the number of antennas. 3. The method according to claim 1, wherein the beam width is greater than the service beam width of the array antenna, and in the step B, a beamforming weight vector meeting requirements is generated according to the beam pointing and beam width. 4. The method according to claim 3, characterized in that, in the step B, a beamforming weight vector meeting the requirements is generated using window function weighting, spatial filter design, global optimal search or local quasi-optimal search methods . 5. The method according to claim 1, wherein in the step C, the downlink beamforming process is performed on the downlink transmit baseband data according to the beamforming weight vector, and the calculation formula of the downlink beamforming output y is: y=w ^H x (3) In formula (3), [·] ^H represents the conjugate transpose operation, w is the beamforming vector, and x is the downlink transmit baseband data vector. 6. The method according to claim 5, characterized in that the beamforming pattern output by the beamforming in the step C and the transmitting signal direction take the antenna array manifold direction as the axis, and satisfy geometric symmetry or approximate symmetry. 7. The method according to claim 1, characterized in that, after step C, further comprising: D. Perform signal processing on the downlink transmission baseband shaped data to obtain radio frequency signals that meet the transmission requirements; E. Transmitting the wireless radio frequency signal through a double-radiating surface array. 8. The method according to claim 7, characterized in that in the step D, digital-to-analog conversion, frequency up-conversion, filtering and/or power amplification are performed on the baseband shaped data for downlink transmission, so as to obtain wireless RF signal. 9. A device for implementing a smart antenna according to any one of claims 1 to 8, wherein the smart antenna adopts a double-radiating surface line array, characterized in that the device includes: The shaping weight vector generation unit is used to determine the beam pointing and beam width for any radiation surface of the dual radiation surface linear array according to the requirements of strip coverage, so as to generate the corresponding beam forming weight vector; The beamforming unit is configured to perform downlink beamforming on the transmission data of the dual radiating surfaces of the dual radiating surface linear array according to the beamforming weight vector, and its forming pattern satisfies a symmetrical or approximately symmetrical relationship. 10. The device of claim 9, further comprising: The multi-channel amplification and transceiver unit is used to perform signal processing on the downlink transmission baseband shaped data to obtain radio frequency signals that meet the transmission requirements; The dual-radiating surface linear array transmits the wireless radio frequency signal.

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