CN112511233A - Radio frequency remote device, active antenna and base station system - Google Patents
Radio frequency remote device, active antenna and base station system Download PDFInfo
- Publication number
- CN112511233A CN112511233A CN201910871277.4A CN201910871277A CN112511233A CN 112511233 A CN112511233 A CN 112511233A CN 201910871277 A CN201910871277 A CN 201910871277A CN 112511233 A CN112511233 A CN 112511233A
- Authority
- CN
- China
- Prior art keywords
- unit
- baseband processing
- antenna
- processing module
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Abstract
The invention provides a radio remote device, comprising: the device comprises a first uplink baseband processing module, a first downlink baseband processing module and a radio frequency processing module; the first uplink baseband processing module is used for performing physical layer processing on an uplink baseband signal, and the first downlink baseband processing module is used for performing physical layer processing on a downlink baseband signal; the radio frequency processing module is used for converting the uplink baseband signal and the radio frequency signal and converting the downlink baseband signal and the radio frequency signal. The invention can reduce the requirement on the interface transmission rate between the baseband processing device and the radio remote device and reduce the network construction cost.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a radio remote device, an active antenna and a base station system.
Background
In a conventional wireless communication system, a Base station is divided into a baseband processing Unit (BBU) and a Radio Remote Unit (RRU). The baseband processing unit mainly performs baseband processing including coding, modulation, layer mapping, resource mapping and the like; the remote radio unit mainly processes radio frequency signals, including conversion, power amplification, filtering and the like of baseband signals and radio frequency signals. The baseband processing unit and the remote Radio unit perform signal transmission through an optical fiber, and a Common Public Radio Interface (CPRI) may be used as an Interface between the baseband processing unit and the remote Radio unit. With the increase of 5G bandwidth and the rapid increase of traffic, the number of antennas increases, which leads to an increase in the interface bandwidth requirements of the conventional baseband processing unit and the conventional remote radio unit, thereby increasing the requirements on the interface transmission rate and increasing the network construction cost.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a remote radio device, an active antenna, and a base station system, so as to reduce a requirement on an interface transmission rate of a baseband processing device and the remote radio device, thereby reducing a network construction cost.
An embodiment of the present invention provides a radio remote unit, including: the device comprises a first uplink baseband processing module, a first downlink baseband processing module and a radio frequency processing module;
the first uplink baseband processing module is used for performing physical layer processing on an uplink baseband signal, and the first downlink baseband processing module is used for performing physical layer processing on a downlink baseband signal;
the radio frequency processing module is used for converting the uplink baseband signal and the radio frequency signal and converting the downlink baseband signal and the radio frequency signal.
Preferably, the first uplink baseband processing module includes:
a fast fourier transform unit, configured to perform cyclic prefix removal on the uplink baseband signal, and then perform fast fourier transform;
the first downstream baseband processing module comprises:
and the inverse fast Fourier transform module is used for performing inverse fast Fourier transform on the received downlink baseband signal and then adding a cyclic prefix.
Preferably, the first uplink baseband processing module further includes:
the resource inverse mapping unit is used for carrying out resource inverse mapping processing on the uplink baseband signals subjected to the fast Fourier transform;
the channel estimation and pre-filtering unit is used for performing channel estimation and pre-filtering on the uplink baseband signal subjected to resource inverse mapping processing;
the first downstream baseband processing module further comprises:
a precoding module, configured to precode the received downlink baseband signal;
and the resource mapping module is used for performing resource mapping on the precoded downlink baseband signal and transmitting the downlink baseband signal subjected to resource mapping to the inverse fast Fourier transform module.
Preferably, the first uplink baseband processing module further includes:
the equalization unit is used for performing channel equalization on the pre-filtered uplink baseband signal and then performing inverse discrete Fourier transform;
a demodulation unit, configured to demodulate the uplink baseband signal subjected to inverse discrete fourier transform;
the first downstream baseband processing module further comprises:
a modulation module, configured to modulate the received downlink baseband signal;
and the layer mapping module is used for performing layer mapping on the modulated downlink baseband signal and transmitting the downlink baseband signal subjected to the layer mapping to the precoding module.
Correspondingly, the embodiment of the invention also provides an active antenna, which comprises the radio remote device and an antenna device for signal transmission with the radio frequency processing module.
Preferably, the antenna device includes: the system comprises an antenna array, a plurality of combining networks, a plurality of phase-shifting feed networks and a plurality of calibration networks;
the antenna array comprises a plurality of antenna sub-arrays, each antenna sub-array comprises at least one antenna unit, and each antenna unit covers a plurality of frequency bands; for any two antenna units, a plurality of frequency bands covered by one antenna unit are the same as a plurality of frequency bands covered by the other antenna unit in a one-to-one correspondence manner;
the plurality of combining networks correspond to the plurality of antenna sub-arrays one to one; the phase-shifting feed networks correspond to the antenna sub-arrays one by one; each phase-shifting feed network comprises a plurality of phase-shifting feed units, and the phase-shifting feed units correspond to a plurality of frequency bands covered by any one antenna unit one by one; the plurality of calibration networks correspond to a plurality of frequency bands covered by any one antenna unit one by one; the calibration network is used for calibrating signals transmitted between the radio frequency processing module and the antenna array;
the combiner network is used for dividing the signals from each antenna unit into multiple paths of signals with different frequency bands and transmitting the signals of the frequency bands to the phase-shifting feed units in a one-to-one correspondence manner; the phase-shifting feed unit is used for transmitting the signals from the combining network to the calibration network corresponding to the frequency band of the signals after phase shifting;
the phase-shift feed unit is also used for transmitting signals from the calibration network to the combining network; the combiner network is further configured to combine signals of multiple frequency bands from the multiple phase-shift feed units and transmit the combined signals to each antenna unit in the antenna subarray.
Preferably, the combining network includes combiners corresponding to the antenna units in the antenna sub-array one to one; the combiner comprises a plurality of input ends and an output end, the input ends of the combiner are correspondingly connected with the phase-shifting feed units of the phase-shifting feed network one by one, and the output end of the combiner is connected with the antenna unit;
the phase-shifting feed unit includes at least one phase shifter connected between the calibration network and the combining network.
Preferably, the radio frequency processing module includes:
an intermediate frequency processing unit, configured to perform conversion between the uplink baseband signal and an intermediate frequency signal, and conversion between the downlink baseband signal and the intermediate frequency signal;
a transceiver unit, configured to perform conversion between the intermediate frequency signal and the radio frequency signal;
the calibration network and the transceiver unit are arranged on the same circuit board.
Accordingly, an embodiment of the present invention further provides a base station system, including: baseband processing apparatus and above-mentioned active antenna, baseband processing apparatus includes: the second uplink baseband processing module and the first uplink baseband processing module are used for carrying out physical layer processing on the uplink baseband signals together; the second downlink baseband processing module and the first downlink baseband processing module are used for performing physical layer processing on the downlink baseband signals together.
Preferably, the first uplink baseband processing module includes a part of uplink baseband processing units in an uplink baseband processing unit group, and the second uplink baseband processing module includes another part of baseband processing units in the uplink baseband processing unit group; the first downlink baseband processing module comprises a part of downlink baseband processing units in a downlink baseband processing unit group, and the second downlink baseband processing module comprises the other part of downlink baseband processing units in the downlink baseband processing unit group;
the plurality of uplink baseband processing units in the uplink baseband processing unit group include: the device comprises a fast Fourier transform unit, a resource inverse mapping unit, a channel estimation and pre-filtering unit, an equalization unit, a demodulation unit, a descrambling unit, a de-rate matching unit and a channel decoding unit;
the plurality of downlink baseband processing units in the downlink baseband processing unit group include: the device comprises a channel coding unit, a rate matching unit, a scrambling unit, a modulating unit, a layer mapping unit, a precoding unit, a resource mapping unit and an inverse fast Fourier transform unit.
In the radio remote apparatus provided in the embodiment of the present invention, the first uplink baseband processing module and the first downlink baseband processing module have a part of physical layer processing function, that is, a part of baseband processing function of the physical layer is moved up to the radio remote apparatus for implementation. The bandwidth requirement between each baseband processing module or unit of the physical layer is in direct proportion to the number of streams and is irrelevant to the number of antennas, so that the requirement of the forward bandwidth of the baseband processing device and the radio remote device can be reduced by moving the first uplink baseband processing module and the first downlink baseband processing module up to the radio remote device, the transmission rate requirement of the optical module and the optical fiber is reduced, and the network construction cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a conventional base station system;
fig. 2 is a block diagram of a remote radio device according to an embodiment of the present invention;
fig. 3 is a block diagram of structures of a baseband processing apparatus and a radio remote apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an uplink baseband processing unit group and a downlink baseband processing unit group according to an embodiment of the present invention;
fig. 5a is a first specific structural schematic diagram of a baseband processing apparatus and a radio remote apparatus according to an embodiment of the present invention;
fig. 5b is a schematic diagram of a second specific structure of the baseband processing apparatus and the radio remote apparatus according to the embodiment of the present invention;
fig. 5c is a schematic diagram of a third specific structure of a baseband processing apparatus and a radio remote apparatus according to an embodiment of the present invention;
fig. 6 is a block diagram of an active antenna provided in an embodiment of the present invention;
fig. 7 is a block diagram of a multi-frequency antenna apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a multi-frequency antenna apparatus and a transceiver unit according to an embodiment of the present invention;
fig. 9 is a layout diagram of a dual-band antenna device with 128 antennas according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a base station system provided in an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a schematic diagram of a conventional Base station system, as shown in fig. 1, the Base station system includes a baseband processing Unit (BBU) 1 and a Radio Remote Unit (RRU) 2, where the baseband processing Unit 1 mainly performs physical layer processing on a baseband signal, for example, performs fast fourier transform, inverse resource mapping, channel estimation and pre-filtering module, and equalization module in an uplink direction; and performing layer mapping, precoding, resource mapping, an inverse fast Fourier transform module and the like in a downlink direction. The remote radio unit 2 only processes the radio frequency signal, and the remote radio unit 2 includes: an intermediate frequency processing module 2a, a transceiver module 2b and a filtering module 2 c. The baseband processing unit 1 and the remote radio unit 2 perform signal transmission through a fronthaul interface, and the bandwidth requirement of the fronthaul interface is positively correlated with the number of antennas, so that the bandwidth requirement of the interface between the baseband processing unit 1 and the remote radio unit 2 is increased by times with the increase of the number of antennas in the 5G system, and an optical transmission module with higher transmission rate is required between the baseband processing unit 1 and the remote radio unit 2, thereby greatly increasing the network construction cost.
As an aspect of the present invention, a radio remote apparatus is provided, fig. 2 is a block diagram of a radio remote apparatus according to an embodiment of the present invention, and as shown in fig. 2, a radio remote apparatus 20 is configured to perform conversion between a baseband signal and a radio frequency signal and process the radio frequency signal, in addition, the radio remote apparatus 20 may perform a part of physical layer processing, specifically, the radio remote apparatus 20 includes: a first uplink baseband processing module 21, a first downlink baseband processing module 22 and a radio frequency processing module 23.
The first uplink baseband processing module 21 is configured to perform physical layer processing on the uplink baseband signal. The first downlink baseband processing module 22 is configured to perform physical layer processing on the downlink baseband signal. The first uplink baseband processing module 21 and the first downlink baseband processing module 22 of the radio remote apparatus 20 both perform signal transmission with the baseband processing apparatus through a signal interface.
The first uplink baseband processing module 21 and the first downlink baseband processing module 22 may each include at least one baseband processing unit, and each baseband processing unit performs a part of the physical layer processing process.
The rf processing module 23 is configured to perform conversion between an uplink baseband signal and an rf signal, and conversion between a downlink baseband signal and an rf signal.
Fig. 3 is a block diagram of structures of a baseband processing apparatus and a radio remote apparatus according to an embodiment of the present invention; as shown in fig. 3, the baseband processing apparatus 10 may perform signal transmission with a plurality of remote radio devices 20, and the signal interfaces between the baseband processing apparatus 10 and the remote radio devices 20 are transmitted through an optical module and an optical fiber. The first uplink baseband processing module 21 and the first downlink baseband processing module 22 disposed in the radio remote device 20 may be configured to complete a physical layer protocol and a frame processing protocol of multiple systems, such as a Global System for Mobile Communication (GSM), a Universal Mobile Telecommunications System (UMTS), a Long Term Evolution (LTE), including Frequency Division Duplex (FDD) and Time Division Duplex (TDD), and a Global 5G standard (5GNR), which are specified by the third Generation Partnership Project (3 GPP), and complete signal processing of a lower physical layer (Low PHY). The baseband processing apparatus 10 may include a second uplink baseband processing module 11 and a second downlink baseband processing module 12, where the second uplink baseband processing module 11 and the second downlink baseband processing module 12 are configured to complete signal processing of a higher physical layer (High PHY). The processing modules provided in the same device may be integrated on the same printed circuit board so as to perform signal transmission through a signal line for high-speed transmission.
In the base station system provided in the embodiment of the present invention, the first uplink baseband processing module 21 and the first downlink baseband processing module 22 having a part of physical layer processing function are moved up to the remote radio head 20, that is, a part of baseband processing function of the physical layer is moved up to the remote radio head 20 for implementation. The bandwidth requirement between the baseband processing modules or units of the physical layer is directly proportional to the number of streams and is independent of the number of antennas, so that moving the first uplink baseband processing module 21 and the first downlink baseband processing module 22 up to the remote radio device 20 can reduce the requirement for the forward bandwidth of the baseband processing device 10 and the remote radio device 20, thereby reducing the transmission rate requirement for the optical module and the optical fiber and reducing the network construction cost.
In some embodiments, the first uplink baseband processing module 21 includes a part of the uplink baseband processing units in the uplink baseband processing unit group, and the second uplink baseband processing module 11 includes another part of the uplink baseband processing units in the uplink baseband processing unit group. The uplink baseband processing unit group comprises a plurality of uplink baseband processing units which are connected according to a second preset sequence.
The first downlink baseband processing module 22 includes a part of downlink baseband processing modules in the downlink baseband processing unit group, and the second downlink baseband processing module includes another part of baseband processing units in the downlink baseband processing unit group. The downlink baseband processing unit group comprises a plurality of downlink baseband processing units which are connected according to a first predetermined sequence.
Fig. 4 is a schematic diagram of an uplink baseband processing unit group and a downlink baseband processing group in the embodiment of the present invention, and as shown in fig. 4, a plurality of uplink baseband processing units in the uplink baseband processing unit group include: fast fourier transform section 111, inverse resource mapping section 112, channel estimation and pre-filtering section 113, equalization section 114, demodulation section 115, descrambling section 116, rate de-matching section 117, and channel decoding section 118.
The fast fourier transform unit 111 is configured to perform cyclic prefix removal (CP removal) on the uplink baseband signal, and then perform Fast Fourier Transform (FFT).
The resource inverse mapping unit 112 is configured to perform resource inverse mapping processing on the uplink baseband signal subjected to the fast fourier transform.
The channel estimation and pre-filtering unit 113 is configured to perform channel estimation (channel estimation) and pre-filtering (pre-filtering) on the uplink baseband signal subjected to the resource inverse mapping process.
The equalization unit 114 performs channel equalization (equalization) on the pre-filtered uplink baseband signal, and then performs Inverse Discrete Fourier Transform (IDFT).
The demodulation unit 115 is configured to demodulate (de-modulate) the uplink baseband signal subjected to the inverse discrete fourier transform.
The descrambling unit 116 is configured to descramble (de-scrambling) the demodulated uplink baseband signal.
The de-rate matching unit 117 is configured to perform de-rate matching (rate de-matching) on the descrambled uplink baseband signal.
The channel decoding unit 118 is configured to perform channel decoding (de-coding) on the uplink baseband signal subjected to rate de-matching.
As shown in fig. 4, the plurality of downlink baseband processing units in the downlink baseband processing unit group includes: channel coding section 121, rate matching section 122, scrambling section 123, modulation section 124, layer mapping section 125, precoding section 126, resource mapping section 127, and inverse fourier transform section 128.
The channel Coding unit 121 is configured to perform channel Coding (Coding) on the received downlink baseband signal.
The Rate matching unit 122 is configured to perform Rate matching (Rate matching) on the downlink baseband signal subjected to channel coding.
The Scrambling unit 123 is configured to perform bit Scrambling (Scrambling) on the rate-matched downlink baseband signal, and transmit the bit-scrambled downlink baseband signal to the modulating unit 124.
The modulation unit 124 is configured to modulate (modulate) the received downlink baseband signal.
The layer mapping unit 125 is configured to perform layer mapping (layer mapping) on the modulated downlink baseband signal, and transmit the layer-mapped downlink baseband signal to the pre-coding unit 126.
The precoding unit 126 is configured to perform precoding (pre-coding) on the received downlink baseband signal.
The resource mapping unit 127 is configured to perform resource mapping (Re mapping) on the precoded downlink baseband signal, and transmit the downlink baseband signal subjected to resource mapping to the inverse fast fourier transform unit 128.
The inverse fast fourier transform unit 128 is configured to perform Inverse Fast Fourier Transform (IFFT) on the downlink baseband signal subjected to the resource mapping, and then perform cyclic prefix (CP addition).
Fig. 5a is a schematic diagram of a first specific structure of a baseband processing apparatus and a radio remote apparatus according to an embodiment of the present invention, and as shown in fig. 5a, a first uplink baseband processing module 21 includes: the fast fourier transform unit 111, the first downlink baseband processing module 22 includes: an inverse fast fourier transform unit 128. Specifically, in the plurality of uplink baseband processing units of the uplink baseband processing unit group, the division is performed between the fast fourier transform unit 128 and the resource inverse mapping unit 112, the fast fourier transform unit 128 is disposed in the remote radio device 20, and the resource inverse mapping unit 112 to the channel decoding unit 118 are disposed in the second uplink baseband processing module 11 of the baseband processing device 10. In the plurality of downlink baseband processing units of the downlink baseband processing unit group, the division is performed between the inverse fast fourier transform unit 128 and the resource mapping unit 127, the inverse fast fourier transform unit 128 is disposed in the radio remote device 20, and the channel coding unit 121 to the resource mapping unit 127 are disposed in the second downlink baseband processing module 12 of the baseband processing device 10.
Fig. 5b is a second specific structural diagram of a baseband processing apparatus and a remote radio apparatus according to an embodiment of the present invention, and different from fig. 5a, the first uplink baseband processing module 21 in fig. 5b includes, in addition to the fast fourier transform unit 111, an inverse resource mapping unit 112 and a channel estimation and pre-filtering unit 113; the first downlink baseband processing module 22 includes the precoding section 126 and the resource mapping section 127 in addition to the inverse fast fourier transform section 128. Specifically, the slicing is performed between the equalizing unit 114 and the channel estimating and pre-filtering unit 113 in the upstream baseband processing unit group, so that the fast fourier transform unit 111, the resource inverse mapping unit 112, and the channel estimating and pre-filtering unit 113 are disposed in the first upstream baseband processing module 21 of the remote radio device 20. The equalization unit 114 to the channel decoding unit 118 are provided in the second upstream baseband processing module 11 of the baseband processing apparatus 10. In addition, in the downlink baseband processing unit group, the precoding unit 126 and the layer mapping unit 125 are split between each other, so that the precoding unit 126, the resource mapping unit 127, and the inverse fast fourier transform unit 128 are disposed in the first downlink baseband processing module 22 of the radio remote device 20, and the layer mapping unit 125 to the channel coding unit 121 are disposed in the second downlink baseband processing module 12 of the baseband processing device 10.
Fig. 5c is a schematic diagram of a third specific structure of a baseband processing apparatus and a radio remote apparatus according to an embodiment of the present invention, and different from fig. 5b, the first uplink baseband processing module 21 in fig. 5c includes, in addition to the fast fourier transform unit 111, the inverse resource mapping unit 112, and the channel estimation and pre-filtering unit 113, further: an equalization unit 114 and a demodulation unit 115. That is, slicing is performed between the demodulation unit 115 and the descrambling unit 116 in the upstream baseband processing unit group, so that the fast fourier transform unit 111, the resource inverse mapping unit 112, the channel estimation and pre-filtering unit 113, the equalization unit 114, and the demodulation unit 115 are disposed in the first upstream baseband processing module 21 of the remote radio apparatus 20. Descrambling unit 116, rate de-matching unit 117 and channel decoding unit 118 are provided in second upstream baseband processing module 11 of baseband processing apparatus 10. In addition, the scrambling unit 123 and the modulating unit 124 in the downlink baseband processing unit group are divided, so that the modulating unit 124, the layer mapping unit 125, the precoding unit 126, the resource mapping unit 127, and the inverse fast fourier transform unit 128 are disposed in the first downlink baseband processing module 22 of the radio remote device 20, and the channel coding unit 121, the rate matching unit 122, and the scrambling unit 123 are disposed in the second downlink baseband processing module 12 of the baseband processing device 10.
For each processing unit, communications between the scrambling unit 123 and the modulating unit 124, between the descrambling unit 116 and the demodulating unit 115, between the layer mapping unit 125 and the precoding unit 126, between the equalizing unit 114 and the channel estimation and pre-filtering unit 113, between the resource mapping unit 127 and the inverse fast fourier transform unit 128, and between the fast fourier transform unit 111 and the resource inverse mapping unit 112 may all comply with the eCRPI protocol, and thus, in the three specific structures in fig. 5a to 5c, segmentation is performed at the position of the eCRPI transmission, so that while the requirement of the interface transmission rate is reduced, normal transmission of signals between the baseband processing device 10 and the remote radio frequency device 20 is ensured, and feasibility of application is improved.
In each of the structures in fig. 5a to fig. 5c, moving up a part of the uplink baseband processing unit and a part of the downlink baseband processing unit to the remote radio device 20 can reduce the interface bandwidth between the baseband processing device 10 and the remote radio device 20 by about 8 times, and meanwhile, the structure is backward compatible with 4G LTE, which facilitates smooth transition of 4G/5G. Moreover, an eCPRI interface protocol is adopted between the baseband processing device and the radio remote device for signal transmission, the transmission mechanism is more flexible, point-to-point, point-to-multipoint and multipoint-to-point transmission is supported, and network layer transmission is supported.
In addition, the baseband processing apparatus 10 further includes a MAC module 13 for performing MAC (Media Access Control) layer processing on the signal. The present invention may also adopt other module splitting manners, for example, splitting between the MAC module 13 and the channel encoding module 121 and between the MAC module 13 and the channel decoding module 118, so as to set the MAC module 13 in the baseband processing device 10, and set the channel encoding unit 121 to the inverse fast fourier transform unit 128 and the fast fourier transform unit 118 to the channel decoding unit 118 in the remote radio device 20.
As shown in fig. 5a to 5c, in the embodiment of the present invention, the rf processing module 23 includes: an intermediate frequency processing unit 231, a transceiving unit 232, and a filtering unit 233. The intermediate frequency processing unit 231 is configured to perform conversion between an uplink baseband signal and a radio frequency signal, and conversion between a downlink baseband signal and a radio frequency signal, and specifically may perform optical interface protocol analysis and mapping, digital up-down frequency conversion, analog-to-digital conversion, digital-to-analog conversion, and the like; the transceiver unit 232 includes a transceiver subunit, a power amplification subunit, and a circulator. The transceiver subunit is used for converting the intermediate frequency signal into the radio frequency signal and converting the radio frequency signal into the intermediate frequency signal. The filtering unit 233 is configured to filter the received uplink signal and the received downlink signal. The structure of the filtering unit 233 is not limited in the present invention, and may be flexibly selected according to actual needs, for example, a ceramic filter, a cavity filter, a microstrip filter, etc. may be used.
As another aspect of the present invention, an active antenna is provided, fig. 6 is a block diagram of a structure of the active antenna provided in an embodiment of the present invention, and as shown in fig. 6, the active antenna includes the remote radio device 20 in the above embodiment, and further includes an antenna device 30 for performing signal transmission with the radio frequency processing module. The Antenna device 30 and the remote radio Unit 20 may be combined into an Active Antenna Unit (AAU).
In some embodiments, the antenna device 30 may be a multi-frequency antenna device to realize multi-frequency co-zenith. Fig. 7 is a block diagram of a structure of a multi-frequency antenna apparatus provided in an embodiment of the present invention, and fig. 8 is a schematic structural diagram of a multi-frequency antenna apparatus and a transceiver unit provided in an embodiment of the present invention, and with reference to fig. 7 and 8, the multi-frequency antenna apparatus includes: the antenna array, the plurality of combining networks 32, the plurality of phase shifting feed networks 33, and the plurality of calibration networks (e.g., calibration network 341 and calibration network 342 in fig. 7).
The antenna array includes a plurality of antenna sub-arrays 31, each antenna sub-array 31 includes at least one antenna unit (e.g., antenna unit 311 and antenna unit 312 in fig. 8), and each antenna unit 311/312 covers multiple frequency bands to transmit and receive radio frequency signals in multiple frequency bands. For any two antenna units in the antenna array, the frequency bands covered by one antenna unit are the same as the frequency bands covered by the other antenna unit in a one-to-one correspondence manner. For example, each antenna element covers the F1 band and the F2 band; for another example, each antenna unit covers the F1 band, the F2 band, and the F3 band.
The following describes the structure of the antenna device in detail with reference to fig. 7 and 8, taking as an example that each antenna element covers the F1 frequency band and the F2 frequency band. The rf processing module 23 may include a plurality of transceiver units 232a, and each frequency band signal transceived by each antenna sub-array 31 corresponds to one transceiver unit 232 a. The plurality of combining networks 32 correspond to the plurality of antenna sub-arrays 31 one to one, and the plurality of phase shift feeding networks 33 correspond to the plurality of antenna sub-arrays 31 one to one. Based on the corresponding relationship, the phase-shift feeding network 33 includes a plurality of phase-shift feeding units (such as the phase-shift feeding unit 331 and the phase-shift feeding unit 332 in fig. 7), and the plurality of phase-shift feeding units (331 and 332) are in one-to-one correspondence with the plurality of frequency bands (F1 frequency band and F2 frequency band) covered by any one of the antenna units 311/312. A plurality of calibration networks (e.g., the calibration network 341 and the calibration network 342 in fig. 7 to 8) are in one-to-one correspondence with a plurality of frequency bands (F1 frequency band and F2 frequency band) covered by any one antenna unit 311/312; the calibration network 341/342 is used to calibrate the signals transmitted between the rf processing module 23 and the antenna array.
The structure and function of the combining network 32 and the phase-shift feeding network 33 corresponding to one of the antenna sub-arrays 31 will be described below by taking the combining network 32 and the phase-shift feeding network 33 as an example. The combining network 32 is configured to divide the signal from each antenna unit 311/312 in the corresponding antenna sub-array 31 into multiple signals of different frequency bands, and transmit the signals of the frequency bands to the phase-shifting feeding units (331 and 332) in a one-to-one correspondence. The phase-shift feeding unit 331 is configured to phase-shift the signal from the combining network 32, and then transmit the signal to the calibration network 341 corresponding to the frequency band of the signal; the phase-shift feeding unit 332 is configured to phase-shift the signal from the combining network 32 and transmit the signal to the calibration network 342 corresponding to the frequency band of the signal.
The phase-shift feeding unit 331 is further configured to transmit the signal from the calibration network 341 to the combining network 32; the phase-shifting feed unit 332 is also used to transmit the signal from the calibration network 342 to the combining network 32. The combining network 32 is further configured to combine the multiple frequency band signals from the phase-shift feeding unit 331 and the phase-shift feeding unit 332, and transmit the combined signals to each antenna unit 311/312 in the antenna sub-array 31.
The combining network 32 may include combiners corresponding to the antenna units in the antenna sub-array 31 one by one (for example, the combiner 321 corresponds to the antenna unit 311, and the combiner 322 corresponds to the antenna unit 312 in fig. 8). The combiner 321/322 includes multiple input ends and an output end, the multiple input ends of the combiner 321 are connected with multiple phase-shift feed units (such as the phase-shift feed unit 331 and the phase-shift feed unit 332 in fig. 7-8) of the phase-shift feed network 33 in a one-to-one correspondence, and the output end of the combiner 321 is connected with the antenna unit 311; a plurality of input terminals of the combiner 322 are connected to a plurality of phase-shift feeding units (such as the phase-shift feeding unit 331 and the phase-shift feeding unit 332 in fig. 7-8) of the phase-shift feeding network 33 in a one-to-one correspondence manner, and an output terminal of the combiner 322 is connected to the antenna unit 312.
Specifically, the combiner 321/322 may be a Wilkinson microstrip combiner, or a combiner based on ceramic or PCB material.
The phase shift feeding unit 331 may include at least one phase shifter 331a connected between the calibration network 341 and the combining network 32, and the phase shift feeding unit 332 may include at least one phase shifter 332a connected between the calibration network 342 and the combining network 32.
Fig. 8 shows a case where the antenna array includes 4 antenna sub-arrays 31, and each antenna sub-array 31 includes two antenna elements 311, as shown in fig. 8, the upper and lower antenna elements 311 form one antenna sub-array 31, and each antenna element 311/312 covers F1 and F2 frequency bands.
In the uplink direction, the multi-band signal received by the antenna unit 311 is divided into two signals of the F1 frequency band and the F2 frequency band by the combiner 321, and the multi-band signal received by the antenna unit 312 is divided into two signals of the F1 frequency band and the F2 frequency band by the combiner 322. Taking one of the antenna sub-arrays 31 as an example, after a phase of a signal of the F1 frequency band split by one of the combiners 322 is shifted by the phase shifter 331a, the signal is combined with a signal of the F1 frequency band split by the other combiner 321 and transmitted to the calibration network 341 corresponding to the F1 frequency band, and after the signal calibrated by the calibration network 341 is filtered by the filtering unit, the signal is transmitted to the transceiving unit 232a corresponding to the antenna sub-array 31 and configured to transceive a signal of the F1 frequency band; similarly, the signal of the F2 frequency band split by one of the combiners 321 is phase-shifted by the phase shifter 332a, then combined with the signal of the F2 frequency band split by the other combiner 322, and transmitted to the calibration network 342 corresponding to the F2 frequency band, and the signal calibrated by the calibration network 342 is filtered by the filtering unit and transmitted to the transceiver unit 232b corresponding to the antenna subarray 31 and configured to transceive the signal of the F2 frequency band.
In the downlink direction, taking one of the antenna sub-arrays 31 as an example, the signal of the transceiver unit 232a corresponding to the antenna sub-array 31 and used for transceiving the signal in the F1 frequency band is filtered by the filtering unit and then transmitted to the calibration network 341 corresponding to the F1 frequency band; the signal of the transceiver unit 232b corresponding to the antenna subarray 31 and configured to transceive the F2 frequency band is filtered by the filtering unit, and then transmitted to the calibration network 342 corresponding to the F2 frequency band; after calibration by the calibration network 341 and the calibration network 342, signals in the F1 frequency band are respectively transmitted to the combiner 321 and the combiner 322, signals in the F2 frequency band are also transmitted to the combiner 321 and the combiner 322, the combiner 321 combines the received signals in the F1 frequency band and the F2 frequency band and transmits the combined signals to the corresponding antenna unit 311, and the combiner 322 combines the received signals in the F1 frequency band and the F2 frequency band and transmits the combined signals to the corresponding antenna unit 312. Before the signal in the F1 frequency band is transmitted to one of the combiners 322, the signal is further subjected to a phase shifting process by the phase shifter 331 a; the signal in the F2 band is also subjected to a phase shift process by the phase shifter 332a before being transmitted to the other combiner 321.
The positions of the phase shifter 331a and the phase shifter 332a in fig. 7 are not particularly limited, and for example, the phase shifter 331a may be provided between the calibration network 341 and the combiner 321, and the phase shifter 332a may be provided between the calibration network 342 and the combiner 322.
Fig. 9 is a layout diagram of a dual-band antenna device with 128 antennas according to an embodiment of the present invention. As shown in fig. 9, the antenna device includes a plurality of dual polarized antennas, each of which includes two pairs of antennas having polarization directions orthogonal to each other, of +45 ° and-45 °, in fig. 9, two antennas having polarization directions of +45 ° are connected to one combiner 321, and two antennas having polarization directions of-45 ° are connected to the other combiner 322, of the two adjacent dual polarized antennas above and below. Two antennas with the same polarization direction connected to the same combiner may be used as one antenna unit, and the connection relationship between the devices in fig. 9 is similar to that in fig. 8, except that in fig. 9, the phase shifter 331a is adjusted to be between the calibration network 341 and the combiner 321, and the phase shifter 332a is adjusted to be between the calibration network 342 and the combiner 322.
In practical application, the antenna array, the calibration network, the phase-shifting feed network and the combiner can be integrated on the same printed circuit board, and the calibration network and the phase-shifting feed unit corresponding to different frequency bands are independent, so that the networks and devices can be distributed in a staggered mode in the structure to ensure the compactness of the structure. Of course, the calibration network may also be disposed on the same circuit board as the transceiver unit, thereby achieving integration with the transceiver unit. For example, the calibration network is disposed between the circulator and the filtering unit, and the signal calibration is performed by coupling and sampling the signal transmitted between the circulator and the filtering unit.
As another aspect of the present invention, a base station system is provided, fig. 10 is a schematic diagram of a base station system according to an embodiment of the present invention, and as shown in fig. 10, the base station system includes a baseband processing device 10 and an active antenna (i.e., the above-mentioned radio frequency processing device 20 and antenna device 30), and the baseband processing module 10 includes: a second uplink baseband processing module 11 and a second downlink baseband processing module 12, where the second uplink baseband processing module 11 and the first uplink baseband processing module 21 are used to perform physical layer processing on the uplink baseband signal together. The second downlink baseband processing module 12 and the first downlink baseband processing module 22 are configured to perform physical layer processing on the downlink baseband signal together.
As described above, the first uplink baseband processing module includes a part of the uplink baseband processing units in the uplink baseband unit group, and the second uplink baseband processing module includes another part of the baseband processing units in the uplink baseband processing unit group. The first downlink baseband processing module comprises a part of downlink baseband processing units in the downlink baseband processing unit group, and the second downlink baseband processing module comprises another part of baseband processing units in the downlink baseband processing unit group.
As shown in fig. 4, the plurality of uplink baseband processing units in the uplink baseband processing unit group include: fast fourier transform section 111, inverse resource mapping section 112, channel estimation and pre-filtering section 113, equalization section 114, demodulation section 115, descrambling section 116, rate de-matching section 117, and channel decoding section 118. The plurality of downlink baseband processing units in the downlink baseband processing unit group comprise: channel coding section 121, rate matching section 122, scrambling section 123, modulation section 124, layer mapping section 125, precoding section 126, resource mapping section 127, and inverse fourier transform section 128.
The functions of the respective baseband processing units are described above and will not be described in detail here. Alternative configurations of the baseband processing apparatus are also described above and will not be described in detail here.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A radio remote unit, comprising: the device comprises a first uplink baseband processing module, a first downlink baseband processing module and a radio frequency processing module;
the first uplink baseband processing module is used for performing physical layer processing on an uplink baseband signal, and the first downlink baseband processing module is used for performing physical layer processing on a downlink baseband signal;
the radio frequency processing module is used for converting the uplink baseband signal and the radio frequency signal and converting the downlink baseband signal and the radio frequency signal.
2. The radio remote unit according to claim 1, wherein the first uplink baseband processing module comprises:
a fast fourier transform unit, configured to perform cyclic prefix removal on the uplink baseband signal, and then perform fast fourier transform;
the first downstream baseband processing module comprises:
and the inverse fast Fourier transform module is used for performing inverse fast Fourier transform on the received downlink baseband signal and then adding a cyclic prefix.
3. The radio remote unit according to claim 2, wherein the first uplink baseband processing module further comprises:
the resource inverse mapping unit is used for carrying out resource inverse mapping processing on the uplink baseband signals subjected to the fast Fourier transform;
the channel estimation and pre-filtering unit is used for performing channel estimation and pre-filtering on the uplink baseband signal subjected to resource inverse mapping processing;
the first downstream baseband processing module further comprises:
a precoding module, configured to precode the received downlink baseband signal;
and the resource mapping module is used for performing resource mapping on the precoded downlink baseband signal and transmitting the downlink baseband signal subjected to resource mapping to the inverse fast Fourier transform module.
4. The remote radio frequency unit according to claim 3, wherein the first uplink baseband processing module further comprises:
the equalization unit is used for performing channel equalization on the pre-filtered uplink baseband signal and then performing inverse discrete Fourier transform;
a demodulation unit, configured to demodulate the uplink baseband signal subjected to inverse discrete fourier transform;
the first downstream baseband processing module further comprises:
a modulation module, configured to modulate the received downlink baseband signal;
and the layer mapping module is used for performing layer mapping on the modulated downlink baseband signal and transmitting the downlink baseband signal subjected to the layer mapping to the precoding module.
5. An active antenna, comprising the remote radio frequency device according to any one of claims 1 to 4, and further comprising an antenna device for signal transmission with the radio frequency processing module.
6. Active antenna according to claim 5, characterized in that the antenna arrangement comprises: the system comprises an antenna array, a plurality of combining networks, a plurality of phase-shifting feed networks and a plurality of calibration networks;
the antenna array comprises a plurality of antenna sub-arrays, each antenna sub-array comprises at least one antenna unit, and each antenna unit covers a plurality of frequency bands; for any two antenna units, a plurality of frequency bands covered by one antenna unit are the same as a plurality of frequency bands covered by the other antenna unit in a one-to-one correspondence manner;
the plurality of combining networks correspond to the plurality of antenna sub-arrays one to one; the phase-shifting feed networks correspond to the antenna sub-arrays one by one; each phase-shifting feed network comprises a plurality of phase-shifting feed units, and the phase-shifting feed units correspond to a plurality of frequency bands covered by any one antenna unit one by one; the plurality of calibration networks correspond to a plurality of frequency bands covered by any one antenna unit one by one; the calibration network is used for calibrating signals transmitted between the radio frequency processing module and the antenna array;
the combiner network is used for dividing the signals from each antenna unit into multiple paths of signals with different frequency bands and transmitting the signals of the frequency bands to the phase-shifting feed units in a one-to-one correspondence manner; the phase-shifting feed unit is used for transmitting the signals from the combining network to the calibration network corresponding to the frequency band of the signals after phase shifting;
the phase-shift feed unit is also used for transmitting signals from the calibration network to the combining network; the combiner network is further configured to combine signals of multiple frequency bands from the multiple phase-shift feed units and transmit the combined signals to each antenna unit in the antenna subarray.
7. The active antenna of claim 6, wherein the combining network comprises combiners in one-to-one correspondence with antenna elements in the antenna sub-array; the combiner comprises a plurality of input ends and an output end, the input ends of the combiner are correspondingly connected with the phase-shifting feed units of the phase-shifting feed network one by one, and the output end of the combiner is connected with the antenna unit;
the phase-shifting feed unit includes at least one phase shifter connected between the calibration network and the combining network.
8. The active antenna of claim 6, wherein the radio frequency processing module comprises:
an intermediate frequency processing unit, configured to perform conversion between the uplink baseband signal and an intermediate frequency signal, and conversion between the downlink baseband signal and the intermediate frequency signal;
a transceiver unit, configured to perform conversion between the intermediate frequency signal and the radio frequency signal;
the calibration network and the transceiver unit are arranged on the same circuit board.
9. A base station system, comprising: baseband processing apparatus and an active antenna of any of claims 5 to 8, the baseband processing apparatus comprising: the second uplink baseband processing module and the first uplink baseband processing module are used for carrying out physical layer processing on the uplink baseband signals together; the second downlink baseband processing module and the first downlink baseband processing module are used for performing physical layer processing on the downlink baseband signals together.
10. The base station system according to claim 9, wherein the first uplink baseband processing module includes a part of the uplink baseband processing units in the uplink baseband processing unit group, and the second uplink baseband processing module includes another part of the baseband processing units in the uplink baseband processing unit group; the first downlink baseband processing module comprises a part of downlink baseband processing units in a downlink baseband processing unit group, and the second downlink baseband processing module comprises the other part of downlink baseband processing units in the downlink baseband processing unit group;
the plurality of uplink baseband processing units in the uplink baseband processing unit group include: the device comprises a fast Fourier transform unit, a resource inverse mapping unit, a channel estimation and pre-filtering unit, an equalization unit, a demodulation unit, a descrambling unit, a de-rate matching unit and a channel decoding unit;
the plurality of downlink baseband processing units in the downlink baseband processing unit group include: the device comprises a channel coding unit, a rate matching unit, a scrambling unit, a modulating unit, a layer mapping unit, a precoding unit, a resource mapping unit and an inverse fast Fourier transform unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910871277.4A CN112511233A (en) | 2019-09-16 | 2019-09-16 | Radio frequency remote device, active antenna and base station system |
| PCT/CN2020/113773 WO2021052209A1 (en) | 2019-09-16 | 2020-09-07 | Radio remote apparatus, active antenna, and base station system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910871277.4A CN112511233A (en) | 2019-09-16 | 2019-09-16 | Radio frequency remote device, active antenna and base station system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112511233A true CN112511233A (en) | 2021-03-16 |
Family
ID=74883902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910871277.4A Withdrawn CN112511233A (en) | 2019-09-16 | 2019-09-16 | Radio frequency remote device, active antenna and base station system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112511233A (en) |
| WO (1) | WO2021052209A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466470A (en) * | 2021-12-27 | 2022-05-10 | 华为技术有限公司 | Signal processing apparatus and data transmission method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316055A (en) * | 2011-09-06 | 2012-01-11 | 中兴通讯股份有限公司 | Base band unit, base band processing unit (BBU), remote radio unit (RRU) and base station |
| CN104378850A (en) * | 2013-08-16 | 2015-02-25 | 普天信息技术研究院有限公司 | Distributed base station |
| CN106506411A (en) * | 2015-09-07 | 2017-03-15 | 普天信息技术有限公司 | Uplink data transmission method and base station |
| CN107517503A (en) * | 2016-06-17 | 2017-12-26 | 中兴通讯股份有限公司 | A kind of processing unit, BBU, RRU and antenna correcting method |
| US20180138957A1 (en) * | 2015-12-21 | 2018-05-17 | Huawei Technologies Co., Ltd. | Data transmission method, remote radio unit rru, and baseband unit bbu |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753181B (en) * | 2008-12-12 | 2015-04-29 | 电信科学技术研究院 | Data transmission method, system and device |
| CN103428721A (en) * | 2012-05-24 | 2013-12-04 | 中兴通讯股份有限公司 | Method and device for processing random access signal |
| CN105227280A (en) * | 2014-06-26 | 2016-01-06 | 中兴通讯股份有限公司 | A kind of data processing equipment and method, BBU, RRU |
-
2019
- 2019-09-16 CN CN201910871277.4A patent/CN112511233A/en not_active Withdrawn
-
2020
- 2020-09-07 WO PCT/CN2020/113773 patent/WO2021052209A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316055A (en) * | 2011-09-06 | 2012-01-11 | 中兴通讯股份有限公司 | Base band unit, base band processing unit (BBU), remote radio unit (RRU) and base station |
| CN104378850A (en) * | 2013-08-16 | 2015-02-25 | 普天信息技术研究院有限公司 | Distributed base station |
| CN106506411A (en) * | 2015-09-07 | 2017-03-15 | 普天信息技术有限公司 | Uplink data transmission method and base station |
| US20180138957A1 (en) * | 2015-12-21 | 2018-05-17 | Huawei Technologies Co., Ltd. | Data transmission method, remote radio unit rru, and baseband unit bbu |
| CN107517503A (en) * | 2016-06-17 | 2017-12-26 | 中兴通讯股份有限公司 | A kind of processing unit, BBU, RRU and antenna correcting method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466470A (en) * | 2021-12-27 | 2022-05-10 | 华为技术有限公司 | Signal processing apparatus and data transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021052209A1 (en) | 2021-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11044663B2 (en) | Transmitter for transmitting discovery signals, a receiver and methods therein | |
| CN108199729B (en) | Multi-way selector switch, radio frequency system and wireless communication equipment | |
| CN108631831B (en) | Information transmission method and equipment | |
| US7912024B2 (en) | Method and apparatus for wide bandwidth mixed-mode wireless communications | |
| CN106464626B (en) | Data transmission method and device between baseband unit BBU and remote radio unit RRU | |
| EP2727300B1 (en) | Evolved distributed antenna system | |
| CN106797355B (en) | Multi-channel I/Q interface between base station and repeater | |
| US20090175243A1 (en) | Method for transmitting and receiving signals using multi-band radio frequencies | |
| EP3400656B1 (en) | Antenna mapping and diversity | |
| US10164731B2 (en) | Method for base station backhaul, related device and system for base station backhaul | |
| WO2008112573A1 (en) | Multiple radios communication device and a method thereof | |
| US9014750B2 (en) | Wireless communication device | |
| JP2022009429A (en) | Signal transmission method and device | |
| US20180102805A1 (en) | Wireless terminal and wireless communication method | |
| WO2021052209A1 (en) | Radio remote apparatus, active antenna, and base station system | |
| CN116368743A (en) | Method and apparatus for positive ac spatial multiplexing and beamforming | |
| KR20120048674A (en) | Wireless communication apparatus and wireless communication method | |
| JP2024517375A (en) | A digital pre-processing chip for mmWave transceiver architectures | |
| JP7293186B2 (en) | Transmission method, reception method, transmission device, and reception device | |
| US7738584B2 (en) | Beamforming in a wireless communication with a partial estimation to reduce overhead | |
| JP2016208311A (en) | Wireless terminal and wireless communication method | |
| KR101486148B1 (en) | Method for cancelling inter-subcarrier interference in wireless communication systems and apparatus for performing the same | |
| US20240056258A1 (en) | Sounding reference signal enhancement for eight transmit uplink operation | |
| EP2803146B1 (en) | Systems and methods for improved high capacity in wireless communication systems | |
| WO2021044753A1 (en) | Communication device and communication method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210316 |