CN110661562A - Transmission system and transmission device for millimeter wave signals - Google Patents
Transmission system and transmission device for millimeter wave signals Download PDFInfo
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- CN110661562A CN110661562A CN201810703447.3A CN201810703447A CN110661562A CN 110661562 A CN110661562 A CN 110661562A CN 201810703447 A CN201810703447 A CN 201810703447A CN 110661562 A CN110661562 A CN 110661562A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
Abstract
The application provides a transmission system and a transmission device of millimeter wave signals, and belongs to the technical field of communication. The method comprises the following steps: in a downlink, a transmission system includes a first device and a second device, the first device includes a distributed antenna system DAS, the DAS is configured to transmit a first intermediate frequency signal, the second device is configured to perform up-conversion processing on the first intermediate frequency signal transmitted by the DAS to obtain a first millimeter wave signal, and the second device is further configured to transmit the first millimeter wave signal, so that user equipment UE in a coverage area of the second device can receive the millimeter wave signal. By the aid of the millimeter wave signal transmission system, millimeter wave signals are transmitted.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a transmission system and a transmission apparatus for millimeter wave signals.
Background
With the development of communication technologies, in order to meet network requirements of a large number of new service scenarios and ultra-high rate requirements of Enhanced mobile bandwidth (eMBB) user equipment, a fifth generation communication and mobile technology (5G) available frequency band includes some frequency points in a millimeter wave frequency band (30GHz to 300GHz), such as 28GHz, 39GHz, 60GHz, and 73GHz, in addition to Sub6G (3.4GHz to 3.6 GHz).
The frequency of the millimeter wave frequency band is relatively high, and compared with the wireless transmission characteristic of low frequency, the diffraction and reflection capability is relatively weak, and further the penetration capability is relatively weak, so that the signal intensity of the signal received by the signal receiving end is relatively weak, and therefore a scheme based on millimeter wave signal transmission is urgently needed to be provided.
Disclosure of Invention
In order to solve the problems in the related art, embodiments of the present invention provide a transmission system and a transmission apparatus for millimeter wave signals. The technical scheme is as follows:
in a first aspect, a transmission system for millimeter wave signals is provided, the transmission system comprising a first device and a second device:
the first device comprises a Distributed Antenna System (DAS) for transmitting a first intermediate frequency signal; the second device is used for carrying out up-conversion processing on the first intermediate-frequency signal transmitted by the DAS to obtain a first millimeter wave signal; the second means is also for transmitting the first millimeter wave signal.
In the solution shown in the embodiment of the present invention, the transmission system in which the first intermediate frequency signal is a millimeter wave signal includes a first device and a second device, the first device includes a Distributed Antenna System (DAS), the second device may be a frequency conversion device or a frequency conversion head end, and is configured to perform frequency conversion processing on a signal (for example, down-converting a millimeter wave signal to an intermediate frequency signal or up-converting an intermediate frequency signal to a millimeter wave signal), when there is data to be transmitted by the UE, the data may be modulated onto a first intermediate frequency signal, the DAS in the first device sends the first intermediate frequency signal modulated with the data to the second device, the second device may perform up-conversion processing on the received first intermediate frequency signal to obtain a first millimeter wave signal, transmit the first millimeter wave signal, since the first millimeter wave signal is modulated with data, the UE in the coverage area of the second device can receive its data from the first millimeter wave signal.
In one possible embodiment, the first apparatus further comprises:
and the repeater is used for carrying out down-conversion processing on the second millimeter wave signal to obtain the first intermediate frequency signal.
According to the scheme of the embodiment of the invention, the first device can further comprise a repeater, the repeater can perform down-conversion processing on the second millimeter wave signal to obtain a first intermediate frequency signal, and the frequency of the second millimeter wave signal can be the same as that of the first millimeter wave signal. In this way, even if the signal received by the first device is a millimeter wave signal, the signal may be down-converted to an intermediate frequency signal by means of down-conversion processing and transmitted by the DAS.
In a possible implementation, the repeater is further configured to: and receiving the second millimeter wave signal.
In the scheme shown in the embodiment of the present invention, the repeater may further receive a second millimeter wave signal, so that the millimeter wave signal is used before data is transmitted to the DAS, the intermediate frequency signal is transmitted in the DAS, and the millimeter wave signal is also transmitted between the second device and the UE, so that data is also transmitted based on the millimeter wave signal.
In one possible embodiment, the transmission system further comprises: third means for generating the second millimeter-wave signal.
In the solution shown in the embodiment of the present invention, the transmission system may further include a third device, where the third device may be configured to generate a second millimeter wave signal, and the third device may be any one of an indoor base station, an outdoor base station, an RRU, and a BBU.
In one possible implementation, the generating the second millimeter wave signal includes: carrying out frequency multiplication processing on a preset baseband signal; and mixing the frequency-doubled signal with a preset first high-frequency signal to obtain the second millimeter wave signal, wherein the frequency of the first high-frequency signal is greater than that of the second millimeter wave signal.
In the solution shown in the embodiment of the present invention, a baseband signal and a first high-frequency signal are preset in the third device, and the frequency of the first high-frequency signal is greater than the frequency of the second millimeter wave signal. The third device may perform frequency multiplication on the baseband signal to obtain a frequency-multiplied signal, and then perform frequency mixing on the frequency-multiplied signal and a preset first high-frequency signal to obtain a second millimeter wave signal.
In a possible implementation manner, the down-converting the second millimeter wave signal to obtain the first intermediate frequency signal includes:
and mixing the second millimeter wave signal with a preset intermediate frequency signal to obtain the first intermediate frequency signal, wherein the frequency of the preset intermediate frequency signal is lower than that of the first intermediate frequency signal.
According to the scheme of the embodiment of the invention, the preset intermediate frequency signal can be preset and stored in the repeater, the frequency of the preset intermediate frequency signal is lower than that of the first intermediate frequency signal, and the repeater can perform frequency mixing processing on the second millimeter wave signal and the preset intermediate frequency signal to obtain a signal, namely the first intermediate frequency signal.
In a possible implementation manner, the performing an up-conversion process on the first intermediate frequency signal transmitted by the DAS to obtain a first millimeter wave signal includes:
and mixing the first intermediate-frequency signal transmitted by the DAS with a preset second high-frequency signal to obtain a first millimeter wave signal, wherein the frequency of the second high-frequency signal is greater than that of the first millimeter wave signal.
According to the scheme shown in the embodiment of the invention, the second high-frequency signal is pre-stored in the second device, and the second device can perform frequency mixing processing on the first intermediate-frequency signal and the preset second high-frequency signal to obtain the first millimeter wave signal. In this way, the second device may transmit the first millimeter wave signal.
In one possible embodiment, the first device is an indoor transmission network.
In the solution shown in the embodiment of the present invention, the first device may be an indoor transmission network, and the indoor transmission network may be a device for receiving a millimeter wave signal and down-converting the millimeter wave signal into an intermediate frequency signal that can be transmitted by the DAS, or a device for generating a millimeter wave signal and down-converting the millimeter wave signal into an intermediate frequency signal that can be transmitted by the DAS. May be a device that integrates the functionality of both a repeater and a DAS. The repeater in the first device can be deployed indoors or outdoors.
In a possible embodiment, the second device is a frequency conversion device or a frequency conversion head end.
In the solution shown in the embodiment of the present invention, the second device may be a frequency conversion device or a frequency conversion head, which is disposed indoors, and may also be referred to as a millimeter wave frequency conversion head, and may receive an intermediate frequency signal transmitted by the DAS, or may also receive a millimeter wave signal from the UE.
In a possible implementation manner, the third apparatus is one or more of an indoor base station, an outdoor base station, a radio remote unit RRU, and a baseband processing unit BBU.
In the solution shown in the embodiment of the present invention, the third device may be disposed indoors or outdoors, and the third device is one of an indoor Base station, a Radio Remote Unit (RRU), and a Base Band Unit (BBU) in a room. When the indoor environment is in the indoor environment, the third device can receive data transmitted from an outdoor base station or a core network side, and the third device can generate a millimeter wave signal for indoor data transmission. When the mobile terminal is outdoors, the third device may receive data transmitted from the core network side, and the third device may generate a millimeter wave signal, modulate the data on the millimeter wave signal, and transmit the millimeter wave signal to the first device.
In a second aspect, there is provided a transmission apparatus of millimeter wave signals, the transmission apparatus including a first processing circuit and a second processing circuit, wherein: the first processing circuit is used for receiving a target millimeter wave signal; the second processing circuit is used for performing down-conversion processing on the target millimeter wave signal to obtain a target intermediate frequency signal; the second processing circuit is further configured to transmit the target intermediate frequency signal.
According to the scheme shown in the embodiment of the invention, when the outdoor base station has data (which can be called as target data) sent to the UE, the outdoor base station can generate a baseband signal, then carry out frequency multiplication processing on the baseband signal, and then carry out frequency mixing processing on the signal subjected to up-conversion processing and a high-frequency signal to obtain a millimeter wave signal. And modulating the target data on the millimeter wave signal, and then sending the millimeter wave signal modulated with the target data to the repeater in an optical cable or wireless air interface signal mode. The repeater may receive the millimeter wave signal transmitted by the outdoor base station. The processing of this step may be performed by a first processing circuit in the transmission apparatus. The repeater may perform frequency mixing processing, that is, down-conversion processing, on the millimeter wave signal modulated with the target data and a preset intermediate frequency signal to obtain the target intermediate frequency signal modulated with the target data, where a frequency of the preset intermediate frequency signal is smaller than a frequency of the target intermediate frequency signal. Or, the repeater may demodulate the millimeter wave signal modulated with the target data to obtain the millimeter wave signal not modulated with the data and the target data, and then perform frequency mixing processing, that is, down-conversion processing, on the millimeter wave signal not modulated with the data and a preset intermediate frequency signal to obtain the target intermediate frequency signal not modulated with the data. And then modulating the target data on the target intermediate frequency signal without modulating the target data to obtain the target intermediate frequency signal modulated with the target data. The processing of this step may be performed by a second processing circuit in the transmission apparatus. The repeater can transmit a target intermediate frequency signal modulated with target data, and the UE in the area covered by the repeater can receive the target intermediate frequency signal and acquire own data from the target intermediate frequency signal. The processing of this step may be performed by a second processing circuit in the transmission apparatus.
In a possible implementation manner, the down-conversion processing is performed on the target millimeter wave signal to obtain a target intermediate frequency signal: and performing frequency mixing processing on the target millimeter wave signal and a preset intermediate frequency signal to obtain a target intermediate frequency signal, wherein the frequency of the preset intermediate frequency signal is less than that of the target intermediate frequency signal.
According to the scheme provided by the embodiment of the invention, the repeater can acquire the pre-stored preset intermediate frequency signal, and then performs frequency mixing processing on the target millimeter wave signal and the preset intermediate frequency signal to obtain the target intermediate frequency signal.
The beneficial effect that technical scheme that this application provided brought includes at least:
in this application, not only provided a transmission system of millimeter wave signal, moreover in indoor scene, can also use indoor original DAS, indoor original DAS can only transmit the highest signal of 2.6G, when indoor transmission millimeter wave signal, adopted the mode that reduces frequency transmission, after falling the millimeter wave signal frequency down to first intermediate frequency signal, can transmit in original DAS, and first intermediate frequency signal frequency is lower than millimeter wave signal frequency a little, transmission loss is also smaller. In an outdoor scene, the data is transmitted between the repeater and the user equipment by using the intermediate frequency signal through the frequency reduction processing of the repeater, so that the transmission loss can be reduced.
Drawings
Fig. 1 is a schematic diagram of an indoor scene provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of an outdoor scene provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a second apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a transmission system of millimeter wave signals according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a transmission system of millimeter wave signals according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an indoor scene provided by an embodiment of the invention;
FIG. 7 is a schematic diagram of an indoor scene provided by an embodiment of the invention;
fig. 8 is a flowchart illustrating a method for transmitting data according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a transmission apparatus for millimeter wave signals according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
To facilitate understanding of the embodiments of the present invention, the following first describes a system architecture related to the embodiments of the present invention and concepts of the terms involved:
the embodiment of the invention can be applied to a 5G network, in order to meet the requirement of an eMB user on ultrahigh speed, the available frequency spectrum of the 5G network comprises a Sub6G and millimeter wave frequency bands such as 28/39/60/73GHz, and compared with the wireless transmission characteristic of a low frequency band, the available frequency spectrum of the 5G network has weaker diffraction and reflection capability and higher path loss and penetration loss of the millimeter wave frequency bands, so that a method for transmitting data based on the millimeter wave frequency bands is provided based on the requirement.
There are a variety of application scenarios in the implementation of the present invention, which are described below:
an indoor scene. As shown in fig. 1, a transmission system of millimeter wave signals includes a first apparatus and a second apparatus, the first apparatus may be an indoor transmission network and may include a DAS, the second apparatus may be deployed indoors, and the second apparatus may be a frequency conversion device or a frequency conversion head end, and is used for up-converting an intermediate frequency signal into a millimeter wave signal or down-converting a millimeter wave signal into an intermediate frequency signal. In a downlink, a first device may be connected to a second device through a DAS, the DAS in the first device may be configured to transmit an intermediate frequency signal to the second device, the second device may be configured to perform up-conversion processing on the intermediate frequency signal transmitted through the DAS to obtain a millimeter wave signal, and perform transmission processing, and a UE in a coverage area of the second device may receive data of the UE from the millimeter wave signal.
Outdoor scenes. The system architecture of the outdoor scenario, as shown in fig. 2, includes an outdoor base station and a transmission device, where the transmission device may be a relay, a repeater, etc., and the outdoor base station and the transmission device are disposed outdoors and between the outdoor base station and the UE. In the downlink, the transmission device is configured to down-convert a millimeter wave signal modulated with data received from the outdoor base station into an intermediate frequency signal modulated with data, transmit the intermediate frequency signal modulated with data in an area covered by the transmission device, and receive the signal by the UE. In the uplink, the transmission device is configured to up-convert the intermediate frequency signal modulated with data received from the UE into a millimeter wave signal modulated with data, and send the millimeter wave signal modulated with data to the outdoor base station to which the transmission device belongs. The outdoor base station is used for receiving data sent by the core network side.
DAS is a network of multiple antennas distributed within a building and dedicated to providing wireless indoor coverage, and may be a passive DAS. A passive DAS is a network consisting of coaxial cables, couplers and power splitters (used to distribute radio frequency signals to various antennas within a building).
UE: also called user equipment and terminal equipment. A terminal device can also be called, among other things, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device may be a Station (ST) in the WLAN, and may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device having a Wireless communication function, a computing device or other processing device connected to a Wireless modem, an in-vehicle device, a wearable device, and a next generation communication system.
An outdoor base station: the UE can be selectively supported by a Global System of Mobile communication (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Universal Mobile Telecommunications System (UMTS), a Universal Microwave Access (WiMAX) communication System, a future fifth Generation (5th Generation, 5G) System, a New Radio (NR), and the like.
Millimeter wave signals, signals with a frequency greater than a certain value, for example, signals with a frequency of 28GHz are millimeter wave signals.
An intermediate frequency signal, which is a signal having a lower frequency than the millimeter wave signal, for example, the frequency of the millimeter wave signal is 28GHz, the frequency of the intermediate frequency signal is 3.5GHz, and the like.
Fig. 3 shows a block diagram of a second apparatus in an embodiment of the invention, which may include at least a receiver 301, a processor 302, a memory 303, and a transmitter 404. The receiver 301 may be configured to implement data reception, specifically, data reception for a UE, the transmitter 404 may be configured to transmit data, specifically, data transmission for a UE, the memory 303 may be configured to store software programs and modules, and the processor 302 executes the software programs and modules stored in the memory 303 to perform various functional applications and data processing. The memory 303 mainly includes a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function, and the like; the storage data area may store data created according to use of the second device, and the like. Further, the memory 303 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 303 may also include a memory controller to provide the processor 302, receiver 301, and transmitter 404 access to the memory 303. The processor 302 is a control center of the second device, connects various parts of the entire second device using various interfaces and lines, and performs various functions of the second device and processes data by running or executing software programs and/or modules stored in the memory 303 and calling data stored in the memory 303, thereby performing overall monitoring of the second device.
Optionally, processor 302 may include one or more processing cores; preferably, the processor 302 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 302.
In the embodiment of the present invention, the scheme is described by taking an application scenario as an indoor scenario in an indoor scenario as an example, and as shown in fig. 1, a transmission system of a millimeter wave signal may be as follows:
the transmission system comprises a first device and a second device, wherein the first device comprises a distributed antenna system DAS, and the DAS is used for transmitting a first intermediate frequency signal; the second device is used for carrying out up-conversion processing on the first intermediate-frequency signal transmitted by the DAS to obtain a first millimeter wave signal; the second means is also for transmitting the first millimeter wave signal.
In implementation, when there is data (the data may be referred to as first data subsequently) to be sent to the UE on the core network side, the device on the core network side may send the first data to the first apparatus through a wireless air interface or an optical cable, and the first device may receive the first data sent by the device on the core network side. Alternatively, when the outdoor base station has data to transmit to the UE, the outdoor base station may transmit the first data to the first device through a wireless air interface or an optical cable, and the first device may receive the first data transmitted by the outdoor base station. After receiving the first data, the first device may modulate the first data on the first intermediate frequency signal, and transmit the first intermediate frequency signal to the second device through the DAS.
After the second device receives the first intermediate frequency signal, because the signal received by the UE is a millimeter wave signal, the second device performs up-conversion processing on the received first intermediate frequency signal, so that the first intermediate frequency signal is up-converted into a millimeter wave signal.
Optionally, the first intermediate-frequency signal transmitted through the DAS and a preset second high-frequency signal are subjected to frequency mixing processing, so as to obtain a first millimeter wave signal.
In implementation, the first intermediate frequency signal modulated with the first data may be demodulated to obtain the first data and a first intermediate frequency signal unmodulated with the first data, and then the first intermediate frequency signal unmodulated with the first data may be up-converted (that is, the first intermediate frequency signal is mixed with a preset second high frequency signal, and the frequency of the second high frequency signal is greater than the frequency of the first millimeter wave signal) to obtain the first millimeter wave signal. The first data is then modulated onto the first millimeter wave signal such that the first data is modulated onto the first millimeter wave signal. Or, the first intermediate frequency signal modulated with the first data may be directly subjected to up-conversion (that is, the first intermediate frequency signal modulated with the first data is subjected to frequency mixing with a preset second high frequency signal) to obtain a first millimeter wave signal, and thus the first millimeter wave signal is also modulated with the first data.
After the second device obtains the first millimeter wave signal modulated with the first data, the second device can perform transmission processing in a radio frequency mode, and the UE within the coverage area of the second device can receive the data sent to the second device.
In this way, when millimeter wave signals are used, DAS of the related art can also be used since intermediate frequency signals are transmitted in the DAS.
Optionally, the first apparatus may be an indoor transmission network, and the indoor transmission network may be an apparatus for receiving a millimeter wave signal and down-converting the millimeter wave signal into an intermediate frequency signal that can be transmitted by the DAS, or an apparatus for generating a millimeter wave signal and down-converting the millimeter wave signal into an intermediate frequency signal that can be transmitted by the DAS. May be a device that integrates the functionality of both a repeater and a DAS. The repeater in the first device can be deployed indoors or outdoors.
Optionally, the second apparatus may be a frequency conversion device or a frequency conversion head, which is disposed indoors, and may also be referred to as a millimeter wave frequency conversion head, and may receive an intermediate frequency signal transmitted by the DAS, and may also receive a millimeter wave signal from the UE, which is a transfer device between the UE and the DAS.
In the embodiment of the present invention, a source of the first intermediate frequency signal is further provided, which includes the following two ways:
the first method is as follows: the first device further comprises a repeater, and the repeater is further used for receiving the second millimeter wave signal and performing down-conversion processing on the second millimeter wave signal to obtain a first intermediate frequency signal.
In implementation, the first device further includes a repeater, as shown in fig. 4, the repeater may be deployed indoors, as shown in fig. 5, or outdoors, and when deployed outdoors, it is equivalent that the repeater may cover an area where the DAS belonging to the first device is located. The repeater can be used for receiving a second millimeter wave signal (the frequency of the second millimeter wave signal can be the same as that of the first millimeter wave signal) sent by the outdoor base station through a wireless or optical cable. The repeater can perform down-conversion processing on the second millimeter wave signal to obtain a first intermediate frequency signal.
Optionally, the down-conversion process may be as follows:
and mixing the second millimeter wave signal with a preset intermediate frequency signal to obtain a first intermediate frequency signal, wherein the frequency of the preset intermediate frequency signal is lower than that of the first intermediate frequency signal.
In implementation, the preset intermediate frequency signal may be preset and stored in the repeater, the frequency of the preset intermediate frequency signal is lower than that of the first intermediate frequency signal, and the repeater may perform frequency mixing processing on the second millimeter wave signal and the preset intermediate frequency signal to obtain a signal, that is, the first intermediate frequency signal.
The second method comprises the following steps: the transmission system further comprises: and the repeater is used for performing down-conversion processing on the second millimeter wave signal to obtain a first intermediate frequency signal.
In an implementation, the transmission system may further include a third apparatus, as shown in fig. 6, where the third apparatus may be one of an indoor base station, an outdoor base station, an RRU, and a BBU, and may be configured to generate the millimeter wave signal. The third device is deployed indoors and is connected with the repeater in the first device through optical fibers or wirelessly. As shown in fig. 7, the third device may be an outdoor base station and may be configured to generate millimeter wave signals. The third device is deployed outdoors and is connected with the repeater in the first device through optical fiber or wireless, and the repeater should be deployed indoors at this time.
When receiving data and sending the data to the UE, the third device can generate a second millimeter wave signal, then modulates the data on the second millimeter wave signal and sends the second millimeter wave signal to the repeater in the first device, and after receiving the second millimeter wave signal, the repeater can perform down-conversion processing to obtain a first intermediate frequency signal.
Optionally, the third apparatus may be disposed indoors or outdoors, where the third apparatus is one of an indoor base station, an RRU, and a BBU. When the indoor environment is in the indoor environment, the third device can receive data transmitted from an outdoor base station or a core network side, and the third device can generate a millimeter wave signal for indoor data transmission. When the mobile terminal is outdoors, the third device may receive data transmitted from the core network side, and the third device may generate a millimeter wave signal, modulate the data on the millimeter wave signal, and transmit the millimeter wave signal to the first device.
Alternatively, the process of generating the millimeter wave signal may be as follows:
carrying out frequency multiplication processing on a preset baseband signal; and mixing the frequency-doubled signal with a preset first high-frequency signal to obtain a second millimeter wave signal, wherein the frequency of the first high-frequency signal is greater than that of the second millimeter wave signal.
In implementation, the third device is preset with a baseband signal and a first high-frequency signal, and the frequency of the first high-frequency signal is greater than that of the second millimeter wave signal. The third device may perform frequency multiplication on the baseband signal to obtain a frequency-multiplied signal, and then perform frequency mixing on the frequency-multiplied signal and a preset first high-frequency signal to obtain a second millimeter wave signal.
It should be noted that the above only shows one method for generating the millimeter wave signal, and all the methods for generating the millimeter wave signal can be applied to the embodiment of the present invention.
Optionally, the down-conversion process may be as follows:
and mixing the second millimeter wave signal with a preset intermediate frequency signal to obtain a first intermediate frequency signal, wherein the frequency of the preset intermediate frequency signal is lower than that of the first intermediate frequency signal.
In implementation, the preset intermediate frequency signal is preset and stored in the repeater, the frequency of the preset intermediate frequency signal is lower than that of the first intermediate frequency signal, and the repeater can perform frequency mixing processing on the second millimeter wave signal and the preset intermediate frequency signal to obtain a signal, namely the first intermediate frequency signal.
It should be noted that, in the above two manners, in order to make the quality of the millimeter wave signal received by the UE better, the first intermediate frequency signal may also be amplified, that is, a signal subsequently transmitted in the DAS is also the amplified first intermediate frequency signal, so that the quality of the millimeter wave signal received by the second device is also better.
In addition, in the implementation of the present invention, a transmission process of millimeter wave signals in an uplink is also provided, and corresponding processing may be as follows:
the first method is as follows: the second device receives the millimeter wave signals, the second device performs down-conversion processing on the received millimeter wave signals to obtain second intermediate frequency signals, the DAS is used for transmitting the second intermediate frequency signals, a repeater in the first device receives the second intermediate frequency signals, up-conversion processing is performed on the second intermediate frequency signals to obtain third millimeter wave signals, and the third millimeter wave signals are sent to an outdoor base station, an indoor base station or a core network side, so that data of the UE can be sent outwards.
The second method comprises the following steps: the second device receives the millimeter wave signals, the second device performs down-conversion processing on the received millimeter wave signals to obtain second intermediate frequency signals, the DAS is used for transmitting the second intermediate frequency signals, a repeater in the first device receives the second intermediate frequency signals and performs up-conversion processing on the second intermediate frequency signals to obtain third millimeter wave signals, the third millimeter wave signals are sent to the third device, and the third device sends data modulated on the third millimeter wave signals to an outdoor base station or a core network side, so that the data of the UE can be sent outwards.
In both of these schemes, although data modulated on the second intermediate frequency signal and the third millimeter wave signal is not shown, data transmitted to the outside by the UE is actually modulated.
In addition, in the embodiment of the present invention, there is further provided that the first apparatus directly generates the first intermediate frequency signal, and transmits the first intermediate frequency signal through the DAS, and the corresponding processing may be as follows:
when receiving data sent to the UE, the first apparatus may directly generate a first intermediate frequency signal, modulate the data onto the first intermediate frequency signal, and transmit the data to the second apparatus through the DAS.
In the embodiment of the invention, not only a millimeter wave signal transmission system is provided, but also an indoor original DAS can be used, the indoor original DAS can only transmit signals with the highest 2.6G, when millimeter wave signals are transmitted indoors, a frequency reduction transmission mode is adopted, the millimeter wave signals can be transmitted in the original DAS after being subjected to frequency reduction to first intermediate frequency signals, the frequency of the first intermediate frequency signals is lower than that of the millimeter wave signals, and the transmission loss is smaller.
In another embodiment of the present invention, an outdoor scenario is further provided, where the execution subject is a transmission device disposed between an outdoor base station and a UE, and the transmission device may be any device that can be disposed between the base station and the UE, receive millimeter wave signals, perform frequency conversion processing, and transmit the signals, for example, the transmission device may be a repeater or a repeater, as shown in fig. 8, corresponding steps may be as follows:
In an implementation, when the outdoor base station has data (which may be referred to as target data) addressed to the UE, the outdoor base station may generate a baseband signal, perform frequency multiplication on the baseband signal, and perform frequency mixing on the up-converted signal and the high-frequency signal to obtain a millimeter wave signal. And modulating the target data on the millimeter wave signal, and then sending the millimeter wave signal modulated with the target data to the repeater in an optical cable or wireless air interface signal mode.
The repeater may receive the millimeter wave signal transmitted by the outdoor base station.
The processing of this step may be performed by a first processing circuit in the transmission apparatus.
And step 802, performing down-conversion processing on the target millimeter wave signal to obtain a target intermediate frequency signal.
In implementation, the repeater may perform frequency mixing processing, that is, down-conversion processing, on the millimeter wave signal modulated with the target data and a preset intermediate frequency signal to obtain the target intermediate frequency signal modulated with the target data, where a frequency of the preset intermediate frequency signal is less than a frequency of the target intermediate frequency signal.
Or, the repeater may demodulate the millimeter wave signal modulated with the target data to obtain the millimeter wave signal not modulated with the data and the target data, and then perform frequency mixing processing, that is, down-conversion processing, on the millimeter wave signal not modulated with the data and a preset intermediate frequency signal to obtain the target intermediate frequency signal not modulated with the data. And then modulating the target data on the target intermediate frequency signal without modulating the target data to obtain the target intermediate frequency signal modulated with the target data.
The processing of this step may be performed by a second processing circuit in the transmission apparatus.
In implementation, the repeater can transmit a target intermediate frequency signal modulated with target data, and the UE in the area covered by the repeater can receive the target intermediate frequency signal and obtain its own data therefrom.
The processing of this step may be performed by a second processing circuit in the transmission apparatus.
Optionally, in order to enable the UE to receive data with high signal quality, the repeater may further amplify the target intermediate frequency signal, and the corresponding processing may be as follows:
and amplifying the target intermediate frequency signal, and transmitting the amplified target intermediate frequency signal.
In implementation, the repeater may amplify the target intermediate frequency signal to obtain an amplified target intermediate frequency signal, and then transmit the amplified target intermediate frequency signal. The UE in the area covered by the repeater can receive the target intermediate frequency signal and acquire the data of the UE from the target intermediate frequency signal. The processing of this step may be performed by a second processing circuit in the transmission apparatus.
Optionally, in the embodiment of the present invention, a process of sending data to the outside by the UE through the millimeter wave signal is further provided, and corresponding processing may be as follows:
receiving a fourth intermediate frequency signal sent by the UE; carrying out up-conversion processing on the received fourth intermediate frequency signal to obtain a fourth millimeter wave signal; and transmitting the fourth millimeter wave signal.
In an implementation, when the UE transmits data (which may be referred to as fourth data) to another UE or when the UE transmits data (which may be referred to as fourth data) to the server, the UE may modulate the fourth data on the fourth if signal and then perform transmission processing on the fourth if signal modulated with the fourth data. The processing may be performed by first processing circuitry.
After a repeater capable of receiving a millimeter wave signal transmitted by the UE receives a fourth intermediate frequency signal modulated with fourth data and transmitted by the UE, the fourth intermediate frequency signal modulated with the fourth data and the fourth intermediate frequency signal unmodulated with the data may be obtained by demodulation, then the fourth intermediate frequency signal unmodulated with the fourth data and a high-frequency signal are subjected to frequency mixing processing to obtain a millimeter wave signal, then the fourth data is modulated onto the millimeter wave signal (the processing process may be performed by a second processing circuit), and the millimeter wave signal modulated with the fourth data is transmitted to an outdoor base station through an optical cable or a wireless air interface (the processing process may be performed by the second processing circuit).
Or, after receiving the fourth intermediate frequency signal modulated with the fourth data and sent by the UE, the repeater may directly perform frequency mixing processing on the fourth intermediate frequency signal modulated with the fourth data and the high-frequency signal to obtain a millimeter wave signal modulated with the fourth data (the processing process may be executed by the second processing circuit), and send the millimeter wave signal modulated with the fourth data to the outdoor base station through an optical cable or a wireless air interface (the processing process may be executed by the second processing circuit).
Optionally, in order to make the signal quality of the millimeter wave signal received by the outdoor base station better, the millimeter wave signal may be amplified, and the corresponding processing may be as follows:
and amplifying the millimeter wave signal modulated with the fourth data, and transmitting the amplified millimeter wave signal modulated with the fourth data.
In implementation, the repeater may amplify the millimeter wave signal modulated with the fourth data, and then transmit the millimeter wave signal modulated with the fourth data to the outdoor base station through an optical cable or a wireless air interface.
In the embodiment of the invention, the repeater downconverts the millimeter wave signal to the intermediate frequency signal and transmits the data to the UE through the intermediate frequency signal, so that the intermediate frequency signal is used for transmitting the data between the repeater and the UE, the frequency of the intermediate frequency signal is lower than that of the millimeter wave signal, and the transmission loss is smaller.
Based on the same technical concept, as shown in fig. 9, an embodiment of the present invention further provides a transmission apparatus for millimeter wave signals, where the transmission apparatus includes a first processing circuit and a second processing circuit, where:
the first processing circuit 910 is configured to receive a target millimeter wave signal;
the second processing circuit 920 is configured to perform down-conversion processing on the target millimeter wave signal to obtain a target intermediate frequency signal;
the second processing circuit 930 is further configured to transmit the target intermediate frequency signal.
Optionally, the second processing circuit 920 is configured to:
and performing frequency mixing processing on the target millimeter wave signal and a preset intermediate frequency signal to obtain a target intermediate frequency signal, wherein the frequency of the preset intermediate frequency signal is less than that of the target intermediate frequency signal.
In the embodiment of the invention, the repeater downconverts the millimeter wave signal to the intermediate frequency signal and transmits the data to the UE through the intermediate frequency signal, so that the intermediate frequency signal is used for transmitting the data between the repeater and the UE, the frequency of the intermediate frequency signal is lower than that of the millimeter wave signal, and the transmission loss is smaller.
It should be noted that: in the transmission device for millimeter wave signals provided in the foregoing embodiment, when data is transmitted, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the transmission device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the transmission apparatus for millimeter wave signals and the method for transmitting data provided in the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments and are not described herein again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only an example of the present invention and should not be taken as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A transmission system for millimeter wave signals, characterized in that it comprises a first means and a second means,
the first device comprises a Distributed Antenna System (DAS) for transmitting a first intermediate frequency signal;
the second device is used for carrying out up-conversion processing on the first intermediate-frequency signal transmitted by the DAS to obtain a first millimeter wave signal;
the second means is also for transmitting the first millimeter wave signal.
2. The transmission system according to claim 1, wherein the first apparatus further comprises:
and the repeater is used for carrying out down-conversion processing on the second millimeter wave signal to obtain the first intermediate frequency signal.
3. The transmission system of claim 2, wherein the repeater is further configured to:
and receiving the second millimeter wave signal.
4. The transmission system according to claim 2, characterized in that the transmission system further comprises:
third means for generating the second millimeter-wave signal.
5. The transmission system according to claim 4, wherein said generating the second millimeter-wave signal comprises:
carrying out frequency multiplication processing on a preset baseband signal;
and mixing the frequency-doubled signal with a preset first high-frequency signal to obtain the second millimeter wave signal, wherein the frequency of the first high-frequency signal is greater than that of the second millimeter wave signal.
6. The transmission system according to any one of claims 2 to 5, wherein the down-converting the second millimeter wave signal to obtain the first intermediate frequency signal includes:
and mixing the second millimeter wave signal with a preset intermediate frequency signal to obtain the first intermediate frequency signal, wherein the frequency of the preset intermediate frequency signal is lower than that of the first intermediate frequency signal.
7. The transmission system according to any one of claims 1 to 5, wherein the up-converting the first intermediate frequency signal transmitted by the DAS to obtain a first millimeter wave signal includes:
and mixing the first intermediate-frequency signal transmitted by the DAS with a preset second high-frequency signal to obtain a first millimeter wave signal, wherein the frequency of the second high-frequency signal is greater than that of the first millimeter wave signal.
8. The transmission system according to any one of claims 1 to 5, wherein said first device is an indoor transmission network.
9. Transmission system according to one of the claims 1 to 5, characterized in that said second means is a frequency conversion device or a frequency conversion head-end.
10. The transmission system according to claim 4, wherein the third device is one or more of an indoor base station, an outdoor base station, a radio remote unit, RRU, and a baseband processing unit, BBU.
11. A transmission apparatus of a millimeter wave signal, characterized in that the transmission apparatus includes a first processing circuit and a second processing circuit, wherein:
the first processing circuit is used for receiving a target millimeter wave signal;
the second processing circuit is used for performing down-conversion processing on the target millimeter wave signal to obtain a target intermediate frequency signal;
the second processing circuit is further configured to transmit the target intermediate frequency signal.
12. The transmission apparatus according to claim 11, wherein the down-conversion processing is performed on the target millimeter wave signal to obtain a target intermediate frequency signal:
and performing frequency mixing processing on the target millimeter wave signal and a preset intermediate frequency signal to obtain a target intermediate frequency signal, wherein the frequency of the preset intermediate frequency signal is less than that of the target intermediate frequency signal.
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