CN101741450A - Uplink signal reception method and system in MIMO system - Google Patents
Uplink signal reception method and system in MIMO system Download PDFInfo
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Abstract
The invention relates to the signal reception of an uplink in a multi-user MIMO system. The invention provides an uplink system and a signal reception method thereof in a multi-user MIMO system. The signal reception method comprises the following steps of: generating a user signal to be transmitted to a base station by a user processing module; transmitting the signal transmitted by the user processing module to a wireless channel by an omnidirectional transmitting antenna module; receiving all the signals within the range of the arrival direction of the specific signal by a receiving antenna unit module; carrying out airspace filtering on the receiving signal of each array element of each antenna unit by a multi-user antenna space response control module; and carrying out channel estimation, multi-user detection, demodulation and decoding aiming at the airspace filtering results of users by a processing module of the base station and realizing multi-user data separation. The invention can enhance the signal interference ratio of the input end of a receiver of the base station and lower the complexity of the post-treatment of channel estimation, multi-user detection and the like at the position of the base station.
Description
Technical field
The present invention relates to wireless communication technology field, the signal that particularly relates to up link in multiuser MIMO (Multiple Input Multiple Output, the multiple-input and multiple-output) system receives.
Background technology
The next generation wireless communication system will provide higher message transmission rate and better service quality for the user, power system capacity also will be greatly improved, and the limited wireless frequency spectrum resource makes the raising of the availability of frequency spectrum become one of important goal in the next generation wireless communication technology simultaneously.MIMO (Multiple Input Multiple Output, multiple-input and multiple-output) system can adapt to this demand for development, has therefore obtained swift and violent development in recent years.Mimo system is by using a plurality of antenna transmission and received signal respectively at transmitting terminal and receiving terminal, obtain space diversity and spatial multiplexing gain, thereby can under the condition that need not extra power consumption and bandwidth, increase considerably power system capacity, significantly improve link quality, improve the availability of frequency spectrum, be applicable to the multimedia services such as sound, video of high transfer rate.At present, point-to-point Single User MIMO systematic research reaches its maturity, and the multi-user MIMO system of point-to-multipoint (MU-MIMO) becomes new research focus.For example, in the wireless lan (wlan) and honeycomb mimo system of reality, communicate by letter simultaneously with a plurality of users usually in a base station, and the user has one or more antenna, and the base station then has many antennas.Multiuser MIMO has lot of advantages: the diversity gain that many antennas bring can improve performance of BER; The spatial multiplexing gain of many antennas can enlarge the throughput of system; In addition, the directive gain that many antennas bring can be from dividing multi-user on the space, thereby eliminates the interference between the user.
In the up link of multi-user MIMO system, all users on identical frequency range to base station transmit signals, a plurality of antenna element received signals are adopted in the base station, when having enough big spacing between the antenna unit, will form a plurality of parallel, incoherent space channels.The main task of base station is to adopt Multiuser Detection or other effective ways to separate from each user's data, realizes that promptly the multi-user inserts.For all multipath signals of fully gathering each user, the maximization that realizes received signal power, the base station receives and all adopts omnidirectional antenna in the existing multi-user MIMO system, and promptly each antenna element all independently receives from the whole signals in the space omnidirectional scope.
Fig. 1 is the up-line system structured flowchart of existing multi-user MIMO system, and as shown in Figure 1, in the transmitter of user j, user's processing module is used to produce N to be sent
jThe road subscriber signal; N
jThe signal that the root omnidirectional antenna provides user's processing module at the user transmitter end sends in the wireless channel; M root isotropic receiving antenna independently receives from the whole signals in the space omnidirectional scope at the base station receiver end; Base station processing module is carried out subsequent treatment to the received signal of M omnidirectional antenna, finishes functions such as channel estimating and Multiuser Detection.
According to the statement in " mobile cellular communication---analog-and digital-system " book as can be known: in the mobile communication system of reality, the maximum effectively scattering radius of outdoor subscriber end is about 100 wavelength; Simultaneously, because most of antenna for base station decorating positions all are higher than the height of nearby buildings, there is not equally distributed scattering object near the antenna for base station the channel circumstance, therefore for specific user, its signal is not an omnidirectional usually when arriving the base station, but is distributed in single signal or bunch signal in the limited direction scope.
Above-mentioned factor is not considered in the use of omnidirectional antenna, can cause lower received signal to noise ratio and stronger interference signal, makes base station receiver need the multiuser detection algorithm of very high channel estimation method of accuracy and complexity to guarantee the throughput of system.
Summary of the invention
The signal acceptance method and the system thereof that the purpose of this invention is to provide up link in a kind of multi-user MIMO system, can can't harm the lost territory and collect the interior whole signals of specific direction scope, effectively suppress the interference of this direction scope signal in addition simultaneously, thereby improve the signal interference ratio of base station receiver input, reduce the complexity of subsequent treatment such as base station place's channel estimating and Multiuser Detection.At present existing several different methods can estimating user send to the arrival direction scope of signal of base station ripple and the distance of user and base station.The arrival direction that adopts MUSIC algorithm, ESPRIT algorithm to can be used for signal wave estimates that wherein the MUSIC algorithm is using suitable height of data long enough or SNR and signal model enough can reach very high precision under the condition accurately.The method of employing received signal power measurement can be measured the approximate distance of user and base station easily.
For achieving the above object, technical scheme of the present invention provides the up-line system in a kind of multi-user MIMO system, described system comprises: user transmitter end, described user transmitter end comprise the omnidirectional transmitter antenna module that is used for producing user's processing module of the subscriber signal that will send to the base station and is used for the signal that described user's processing module provides is sent to wireless channel; The base station receiver end, described base station receiver end comprises: the adjustable reception antenna unit module of roomage response that is used to receive all signals in the specific signal arrival direction scope; Be used for the received signal in the specific arrival direction scope is carried out multi-user's antenna space response module of airspace filter; Be used for the signal behind the airspace filter is handled and finished the base station processing module of channel estimating and Multiuser Detection.
More specifically, wherein said multi-user's antenna space response module comprises: weight coefficient is determined submodule, described weight coefficient determine submodule according to each array element in the distance calculation reception antenna unit of the arrival direction scope of each subscriber signal and user and base station at the weight coefficient of different user; Weighting merges submodule, and described weighting merges submodule the subscriber signal that each antenna element received is weighted merging.
Wherein, the adjustable antenna element of described roomage response is the miniature antenna battle array that contains a plurality of array elements.
Wherein, the roomage response of described reception antenna unit is by being used for collecting the main lobe of the multipath signal in the specific arrival direction scope and being used for suppressing forming from the secondary lobe of the interference of other direction.
Another aspect of the present invention provides a kind of signal acceptance method of multi-user MIMO system up link, and described method comprises: user's processing module of user transmitter end produces the subscriber signal that will send to the base station; The signal that the omnidirectional transmitter antenna module of user transmitter end provides user's processing module sends in the wireless channel; The reception antenna unit module that the roomage response of base station receiver end is adjustable receives all signals in the specific signal arrival direction scope; Multi-user's antenna space response module of base station receiver end sends to the arrival direction scope of signal of base station ripple and the distance of each user and base station according to each user, the received signal of each array element of each antenna element is carried out airspace filter at different user, obtain the airspace filter result of each antenna element at each user; Base station processing module utilizes the reception antenna unit to carry out channel estimating, Multiuser Detection, demodulation sign indicating number at user's airspace filter result, realizes that a plurality of users receive the separation of data.
More specifically, the method of described multi-user's antenna space response control comprises: determine weight coefficient, weight coefficient determine submodule according to each array element in the distance calculation reception antenna unit of the arrival direction scope of each subscriber signal and user and base station at the weight coefficient of different user, and described weight coefficient exported to weighting merge submodule; Weighting merges submodule and utilizes described weight coefficient that described determining step obtains that the received signal of each array element in each reception antenna unit is weighted merging, signal to the user in the specific arrival direction scope carries out airspace filter, obtains the reception antenna unit at user's airspace filter signal and export each user's airspace filter signal.
The system of technical solution of the present invention improves on the basis of the up-line system of existing multi-user MIMO system, removed the isotropic receiving antenna module of base station receiver end in the original system, by in the base station receiver of multi-user MIMO system up link, introducing adjustable reception antenna unit module and the multi-user's antenna space response module of roomage response, effectively suppress the interference of other signal outside specific user's direction of arrival of signal scope, be implemented in of separation and the screening of base station receiver front end by airspace filter to the user, thereby improve the signal interference ratio of base station receiver input, reduce the complexity of subsequent treatment such as base station place's channel estimating and Multiuser Detection.
Description of drawings
Fig. 1 is the structured flowchart of up-line system in the multi-user MIMO system of prior art;
Fig. 2 is the structured flowchart of up-line system in the multi-user MIMO system of technical solution of the present invention embodiment;
Fig. 3 is the structured flowchart of multi-user's antenna space response module of up-line system in the multi-user MIMO system of technical solution of the present invention embodiment;
Fig. 4 is the airspace filter oscillogram of the reception antenna unit, base station of the up-line system in the multi-user MIMO system of technical solution of the present invention embodiment;
Fig. 5 is the received signal signal interference ratio analogous diagram/error performance analogous diagram of up-line system in the multi-user MIMO system of up-line system and technical solution of the present invention embodiment in the multi-user MIMO system of prior art.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The structured flowchart of the up-line system in the multi-user MIMO system of technical solution of the present invention as shown in Figure 2, this system comprises user's processing module and omnidirectional transmitter antenna module at the user transmitter end, comprises the adjustable reception antenna unit module of roomage response, multi-user's antenna space response module and base station processing module at the base station receiver end; Wherein, multi-user's antenna space response module is divided into two submodules: weight coefficient determines that submodule and weighting merge submodule, as shown in Figure 3.
User's processing module of the transmitter terminal of user j is used for generation will send to signal of base station
The omnidirectional transmitter antenna module is used for the signal that user's processing module provides is sent to wireless channel.
The reception antenna unit module that the roomage response of base station receiver end is adjustable is used to receive all signals in the signal specific arrival direction scope; Multi-user's antenna space response module is used for the received signal r to each array element in each antenna element of the adjustable reception antenna unit module of roomage response
I, k(n) carry out airspace filter, obtain filtered signal r at different user
i j(n); Base station processing module is used for signal r
i j(n) handle, finish functions such as channel estimating, Multiuser Detection.
Wherein, multi-user's antenna space response module determines that by weight coefficient submodule and weighting merge submodule and form, and weight coefficient is determined the direction of arrival of signal scope of submodule according to each user
With user distance d
jCalculate in each reception antenna unit each array element at the weight coefficient W of different user
I, k j, and this weight coefficient is exported to weighting merge submodule; Weighting merges submodule and utilizes weight coefficient W
I, k jReceived signal r to each array element in each reception antenna unit
I, k(n) be weighted merging, the subscriber signal in the specific arrival direction scope carried out the effect of airspace filter, and export each user's airspace filter signal r thereby reach
i j(n).
Wherein, reception antenna unit, base station has the adjustable characteristics of roomage response, and more specifically, roomage response is made up of main lobe and secondary lobe: main lobe is wide, and the main lobe energy distribution is smooth, thereby realizes the abundant collection to the multipath signal in the specific arrival direction scope; Side-lobe energy is little, thereby effectively suppresses to disturb from the signal of other direction.The implementation method that satisfies the adjustable antenna element of the roomage response of These characteristics has a variety of, and such as utilizing the miniature antenna battle array that contains a plurality of array elements to realize an antenna element that roomage response is adjustable, particularly, i antenna element is by containing L
iThe miniature antenna battle array of individual array element realizes, i=1 wherein, and 2 ..., M, M are the number of reception antenna unit.But this is a kind of more excellent scheme, can not be as limitation of the present invention.
Another aspect of the present invention also provides a kind of signal acceptance method of multi-user MIMO system up link, said method comprising the steps of:
Step S01: user's processing module of the transmitter terminal of the user j of up-line system produces the N that will send to base station receiver
jThe road signal
S wherein
i j(n) the emission data of j user's of expression i transmitting antenna, j=1,2 ..., K, i=1,2 ..., N
j, K is the total number of users in the system, N
jNumber of transmit antennas for the transmitter of user j;
Step S02: the N of the transmitter terminal of the user j of up-line system
jThe signal that individual omnidirectional transmitter antenna provides user's processing module respectively
Send in the wireless channel;
Step S03: M reception antenna unit of the base station receiver end of up-line system receives the signal that K user transmitter sends to base station receiver, each reception antenna unit has the adjustable characteristics of roomage response, thereby fully collects all signals in the specific arrival direction scope;
Step S04: multi-user's antenna space response module of the base station receiver end of up-line system sends to the arrival direction scope of signal of base station ripple according to each user
(wherein
Be the arrival direction scope of j user's ripple) and the distance D=[d of each user and base station
1, d
2..., d
K], to the received signal r of each array element of each antenna element
I, k(n) carry out airspace filter, obtain each antenna element at each user's airspace filter r as a result
i j(n), wherein,
With
Represent that respectively user j sends to the arrival direction scope of signal of base station ripple and the distance of user j and base station, r
I, k(n) k signal that array element receives in i the antenna element of expression base station receiver, r
i j(n) received signal of i antenna element of expression base station receiver is at the airspace filter result of user j, i=1 ..., M, k=1 ..., L
i, j=1,2 ..., K, M are the number of the reception antenna unit of base station receiver, L
iBe the element number of array in i the antenna element of base station receiver, K is the total number of users in the system;
Step S05: the base station processing module of the base station receiver end of up-line system utilizes M reception antenna unit at K user's airspace filter r as a result
i j(n) carry out subsequent treatment such as channel estimating, Multiuser Detection, demodulation sign indicating number.
More specifically, the process of described multi-user's antenna space response control specifically comprises: determine weight coefficient, promptly according to the arrival direction scope of the signal wave of user j
And user j and base station apart from d
j, determine that each array element is at the weight coefficient W of user j in the reception antenna unit
I, k j, wherein
I=1 wherein, 2 ..., M, k=1,2 ..., L
i, j=1,2 ..., K, M are the number of reception antenna unit, L
iBe the element number of array in i the antenna element, K is the total number of users in the system, A
I, k jThe expression amplitude, θ
I, k jThe expression phase place;
Utilize the weighted factor W of gained
I, k jReceived signal r to each array element in each reception antenna unit
I, k(n) be weighted merging, thereby reach specific arrival direction scope
The signal of interior user j carries out the purpose of airspace filter, obtains the airspace filter signal of i reception antenna unit at user j
Wherein, r
I, k(n) be in i the reception antenna unit k array element at the received signal of moment n, W
I, k jBe pairing weight coefficient on k the array element of user j in i reception antenna unit, L
iIt is the element number of array in i the antenna element;
Further, base station processing module to M reception antenna unit at K user's airspace filter r as a result
i j(n) carry out subsequent treatment such as demodulation sign indicating number, carry out Multiuser Detection, realize that a plurality of users receive effective separation of data.
Enumerate a specific embodiment of the signal acceptance method of multi-user MIMO system up link of the present invention below:
Have K=2 user in the up-line system: the coefficient correlation between 2, two subscriber signals of user 1 and user equals 0.2.The base station receiver end uses M=2 the antenna element that roomage response is adjustable, and each wire antenna battle array is made of the uniform line-array of one 4 array element, i.e. L
1=L
2=4.
User side is to the base station data, is the center, is 2 antenna elements that radius arrives the base station with certain angle spread that with some directions the received signal of each antenna element is uncorrelated mutually through the multipath signal that forms after the volume scattering of user's ambient.
The arrival direction algorithm for estimating that utilizes signal wave as can be known each user's signal at the direction scope Φ of receiving terminal: user 1 signal arrives the multipath signal r of place, base station antenna element 1 through transmission back, space
1, k 1(n) angular range
For: [18 °, 22 °], user 1 signal is at the received signal r at base station antenna unit 2 places
2, k 1(n) angular range
For: [21 °, 25 °]; User 2 signal arrives the signal r of place, base station antenna element 1 through transmission back, space
1, k 2(n) angular range
For: [57 °, 63 °], user 2 signal is at the received signal r at base station antenna unit 2 places
2, k 2(n) angular range
For: [61 °, 67 °].
Multi-user's antenna space response module at place, base station is according to the arrival direction scope of user's 1 signal wave
And with the base station apart from d
1The weight coefficient of trying to achieve 4 array elements in the reception antenna unit 1 is respectively:
And carry out airspace filter to received signal, obtain
Same step can be respectively in the hope of the weight coefficient of 4 array elements in the reception antenna unit 2:
And corresponding received signal carried out airspace filter, obtain
The user 1 signal r of gained after the filtering
1 1(n) and r
2 1(n) give base station processing module and carry out subsequent treatment.Similarly, according to the arrival direction scope of user's 2 signal waves
And with the base station apart from d
2Can be respectively in the hope of the respective weight coefficient of 4 array elements in reception antenna unit 1 and 2:
Further obtain filtered signal r
1 2(n) and r
2 2(n) give base station processing module and carry out subsequent treatment.Being illustrated in figure 4 as the wire antenna battle array, the array element distance that contain 4 array elements is that 1/2 wavelength, desired subscriber signal direction are the airspace filter oscillogram of the reception antenna unit, base station of 30 degree.
By relatively proof: after using the receiving system of technical solution of the present invention to simulation result, the bit error rate performance of up-line system is better than original base station receiving system in the multi-user MIMO system, especially under the signal to noise ratio condition with higher, performance advantage can be more outstanding.As shown in Figure 5, wherein 1 is original receiving system, and 2 is the receiving system of technical solution of the present invention embodiment.
Above execution mode only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1. the up-line system in the multi-user MIMO system is characterized in that described system comprises:
The user transmitter end, described user transmitter end comprises:
User's processing module, described user's processing module is used to produce the subscriber signal that will send to the base station;
Omnidirectional transmitter antenna module, described omnidirectional transmitter antenna module are used for the signal that described user's processing module provides is sent to wireless channel;
The base station receiver end, described base station receiver end comprises:
The reception antenna unit module that roomage response is adjustable, the reception antenna unit module that described roomage response is adjustable are used to receive all signals in the specific signal arrival direction scope;
Multi-user's antenna space response module, described multi-user's antenna space response module is used for the received signal in the specific arrival direction scope is carried out airspace filter;
Base station processing module, described base station processing module are used for channel estimating and Multiuser Detection are handled and finished to the signal behind the airspace filter.
2. the up-line system in the multi-user MIMO system as claimed in claim 1 is characterized in that, wherein said multi-user's antenna space response module comprises:
Weight coefficient is determined submodule, described weight coefficient determine submodule according to each array element in the distance calculation reception antenna unit of the arrival direction scope of each subscriber signal and user and base station at the weight coefficient of different user;
Weighting merges submodule, and described weighting merges submodule the subscriber signal that each antenna element received is weighted merging.
3. the up-line system in the multi-user MIMO system as claimed in claim 1 is characterized in that, the antenna element that wherein said roomage response is adjustable is the miniature antenna battle array that contains a plurality of array elements.
4. the up-line system in the multi-user MIMO system as claimed in claim 1, it is characterized in that the roomage response of wherein said reception antenna unit is by the main lobe that is used for collecting the multipath signal in the specific arrival direction scope and be used for suppressing forming from the secondary lobe of the interference of other direction.
5. the signal acceptance method of a multi-user MIMO system up link is characterized in that, described method comprises:
User's processing module of user transmitter end produces the subscriber signal that will send to the base station;
The signal that the omnidirectional transmitter antenna module of user transmitter end provides user's processing module sends in the wireless channel;
The reception antenna unit module that the roomage response of base station receiver end is adjustable receives all signals in the specific signal arrival direction scope;
Multi-user's antenna space response module of base station receiver end sends to the arrival direction scope of signal of base station ripple and the distance of each user and base station according to each user, the received signal of each array element of each antenna element is carried out airspace filter at different user, obtain the airspace filter result of each antenna element at each user;
Base station processing module utilizes the reception antenna unit to carry out channel estimating, Multiuser Detection, demodulation sign indicating number at user's airspace filter result, realizes that a plurality of users receive the separation of data.
6. the signal acceptance method of multi-user MIMO system up link as claimed in claim 5 is characterized in that, the method for wherein said multi-user's antenna space response control comprises:
Determine weight coefficient, weight coefficient determine submodule according to each array element in the distance calculation reception antenna unit of the arrival direction scope of each subscriber signal and user and base station at the weight coefficient of different user, and described weight coefficient exported to weighting merge submodule;
Weighting merges submodule and utilizes described weight coefficient that described determining step obtains that the received signal of each array element in each reception antenna unit is weighted merging, signal to the user in the specific arrival direction scope carries out airspace filter, obtains the reception antenna unit at user's airspace filter signal and export each user's airspace filter signal.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487284A (en) * | 2010-12-02 | 2012-06-06 | 四零四科技股份有限公司 | Communication device provided with asymmetric gain antenna and communication method thereof |
| CN105406906A (en) * | 2014-09-11 | 2016-03-16 | 清华大学 | Position-based pre-coding method and system |
| WO2016184362A1 (en) * | 2015-05-15 | 2016-11-24 | 索尼公司 | Device and method for wireless communication and communication terminal |
| CN111988071A (en) * | 2019-05-24 | 2020-11-24 | 中兴通讯股份有限公司 | LTE and NR user space division multiplexing method |
| CN112751795A (en) * | 2019-10-31 | 2021-05-04 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Antenna array and radio receiving method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050030897A1 (en) * | 2003-08-08 | 2005-02-10 | Sumeet Sandhu | Transmission of data with feedback to the transmitter in a wireless local area network or the like |
| CN1672345A (en) * | 2002-07-30 | 2005-09-21 | 拉瓦尔大学 | Array receiver with subarray selection, method of using same, and receiver system incorporating same |
| CN101006657A (en) * | 2005-01-21 | 2007-07-25 | 株式会社东芝 | Wireless communications system and method |
-
2008
- 2008-11-21 CN CN200810227116A patent/CN101741450A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1672345A (en) * | 2002-07-30 | 2005-09-21 | 拉瓦尔大学 | Array receiver with subarray selection, method of using same, and receiver system incorporating same |
| US20050030897A1 (en) * | 2003-08-08 | 2005-02-10 | Sumeet Sandhu | Transmission of data with feedback to the transmitter in a wireless local area network or the like |
| CN101006657A (en) * | 2005-01-21 | 2007-07-25 | 株式会社东芝 | Wireless communications system and method |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102487284A (en) * | 2010-12-02 | 2012-06-06 | 四零四科技股份有限公司 | Communication device provided with asymmetric gain antenna and communication method thereof |
| CN102487284B (en) * | 2010-12-02 | 2014-03-26 | 四零四科技股份有限公司 | Communication device provided with asymmetric gain antenna and communication method thereof |
| CN105406906A (en) * | 2014-09-11 | 2016-03-16 | 清华大学 | Position-based pre-coding method and system |
| CN105406906B (en) * | 2014-09-11 | 2018-04-10 | 清华大学 | Location-based method for precoding and system |
| WO2016184362A1 (en) * | 2015-05-15 | 2016-11-24 | 索尼公司 | Device and method for wireless communication and communication terminal |
| CN106301514A (en) * | 2015-05-15 | 2017-01-04 | 索尼公司 | Device for wireless communications and method, communication terminal |
| US10651890B2 (en) | 2015-05-15 | 2020-05-12 | Sony Corporation | Device and method for wireless communication and communication terminal |
| CN106301514B (en) * | 2015-05-15 | 2021-01-05 | 索尼公司 | Device and method for wireless communication and communication terminal |
| CN111988071A (en) * | 2019-05-24 | 2020-11-24 | 中兴通讯股份有限公司 | LTE and NR user space division multiplexing method |
| WO2020238563A1 (en) * | 2019-05-24 | 2020-12-03 | 中兴通讯股份有限公司 | Space division multiplexing method for lte and nr users |
| CN112751795A (en) * | 2019-10-31 | 2021-05-04 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Antenna array and radio receiving method |
| CN112751795B (en) * | 2019-10-31 | 2023-05-16 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Antenna array and radio receiving method |
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