CN109547105B - Communication equipment for realizing MIMO transmission - Google Patents

Communication equipment for realizing MIMO transmission Download PDF

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Publication number
CN109547105B
CN109547105B CN201710866632.XA CN201710866632A CN109547105B CN 109547105 B CN109547105 B CN 109547105B CN 201710866632 A CN201710866632 A CN 201710866632A CN 109547105 B CN109547105 B CN 109547105B
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far
module
signal
frequency conversion
uplink
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CN109547105A (en
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闵海军
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Prologis Communication Technology Suzhou Co Ltd
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Rosenberger Shanghai Technology Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25Arrangements specific to fibre transmission
    • H04B10/2575Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752Optical arrangements for wireless networks
    • H04B10/25758Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
    • H04B10/25759Details of the reception of RF signal or the optical conversion before the optical fibre
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25Arrangements specific to fibre transmission
    • H04B10/2581Multimode transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transceivers (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses communication equipment for realizing MIMO transmission, and belongs to the technical field of mobile communication. The remote terminal outputs the received downlink signals which are not subjected to frequency conversion, and restores the downlink signals subjected to frequency conversion to the original frequency and then outputs the downlink signals; the remote terminal outputs the received two paths of uplink signals, wherein one path of uplink signals is output to the near-end machine without frequency conversion, the other path of uplink signals is output to the near-end machine after frequency conversion, the near-end machine outputs the received uplink signals without frequency conversion, and the uplink signals after frequency conversion are recovered to the original frequency and then are output. The invention realizes the co-cable transmission of signals by adopting a frequency conversion mode, reduces the number of optical fibers and reduces the production cost.

Description

Communication equipment for realizing MIMO transmission
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a communication device for implementing MIMO transmission.
Background
MIMO (Multiple-Input Multiple-Output) refers to using Multiple transmitting antennas and Multiple receiving antennas at a transmitting end and a receiving end, respectively, so that signals are transmitted and received through the Multiple antennas at the transmitting end and the receiving end, thereby improving communication quality. The multi-antenna multi-transmission multi-receiving system can fully utilize space resources, realize multi-transmission and multi-reception through a plurality of antennas, and improve the system channel capacity by times under the condition of not increasing frequency spectrum resources and antenna transmitting power.
With the development of mobile technology, fourth generation mobile communication systems based on MIMO technology are increasingly widely used due to the significant advantages of MIMO technology.
When network coverage construction is carried out, when signals are transmitted by traditional BTS-SISO signals and BTS-MIMO signals which are both communication optical fibers, two optical fibers are often needed to realize transmission due to different frequencies, so that the input cost is increased, and the wiring is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the communication equipment for realizing signal co-cable transmission by adopting a frequency conversion mode, so that the number of optical fibers is reduced, and the cost is reduced.
In order to achieve the purpose, the invention provides the following technical scheme: a communication device for realizing MIMO transmission comprises a near-end machine and a far-end machine,
the near-end machine receives two paths of downlink signals, one path of downlink signals are output to the far-end machine without frequency conversion, the other path of downlink signals are output to the far-end machine after frequency conversion, the far-end machine outputs the received downlink signals without frequency conversion, and the downlink signals after frequency conversion are output after being restored to the original frequency;
the remote terminal outputs the received two paths of uplink signals, wherein one path of uplink signals are output to the near-end machine without frequency conversion, the other path of uplink signals are output to the near-end machine after frequency conversion, the near-end machine outputs the received uplink signals without frequency conversion, and the uplink signals after frequency conversion are recovered to the original frequency and then are output.
Preferably, the near-end machine comprises
The first near-end signal input-output module and the second near-end signal input-output module are used for inputting/outputting uplink signals/downlink signals;
the near-end signal power amplification module is connected with the first near-end signal input and output module and is used for amplifying the uplink signal/the downlink signal;
the near-end signal frequency conversion module is connected with the second near-end signal input and output module and is used for carrying out frequency conversion on the uplink signal/the downlink signal;
the near-end combiner is connected with the near-end signal power amplification module and the near-end signal frequency conversion module and is used for combining downlink signals;
the near-end splitter is connected with the near-end signal power amplification module and the near-end signal frequency conversion module and is used for splitting the uplink signal;
and the near-end photoelectric conversion module is connected with the near-end splitter and the near-end combiner and is used for performing photoelectric conversion on the uplink signal/the downlink signal.
Preferably, the remote machine comprises
The first remote signal input and output module and the second remote signal input and output module are used for inputting/outputting uplink signals/downlink signals;
the far-end downlink signal processing module is connected with the first far-end signal input and output module and the second far-end signal input and output module and is used for carrying out signal filtering amplification and frequency conversion on downlink signals;
the far-end uplink signal processing module is connected with the first far-end signal input and output module and the second far-end signal input and output module and is used for carrying out signal filtering amplification and frequency conversion on uplink signals;
the far-end branching unit is connected with the far-end downlink signal processing module and is used for branching the downlink signal;
the far-end combiner is connected with the far-end uplink signal processing module and is used for combining uplink signals;
and the far-end photoelectric conversion module is connected with the far-end splitter and the far-end combiner and is used for performing photoelectric conversion on the uplink signal/the downlink signal.
Preferably, the near-end signal power amplifier module includes a near-end downlink signal amplification module and a near-end uplink signal amplification module, and both the near-end downlink signal amplification module and the near-end uplink signal amplification module include amplifiers.
Preferably, the near-end signal frequency conversion module includes a near-end downlink signal frequency conversion module and a near-end uplink signal frequency conversion module, and both the near-end downlink signal frequency conversion module and the near-end uplink signal frequency conversion module include an amplifier, a mixer, and an amplifier that are sequentially connected in series.
Preferably, the far-end downlink signal processing module includes a far-end downlink signal amplification module and a far-end downlink signal frequency conversion module, the far-end downlink signal amplification module includes a filter and an amplifier in series connection with the filter, and the far-end downlink signal frequency conversion module includes a filter, a mixer and an amplifier which are connected in series in sequence.
Preferably, the far-end uplink signal processing module comprises a far-end uplink signal power amplifier module and a far-end uplink signal frequency conversion module, the far-end uplink signal amplification module comprises a filter and an amplifier connected in series with the filter, and the far-end uplink signal frequency conversion module comprises a filter, a mixer and an amplifier which are sequentially connected in series.
Preferably, the first near-end signal input/output module includes a first near-end duplexer, the second near-end signal input/output module includes a second near-end duplexer, one end of the first near-end duplexer is connected to the base station transceiver, and the other end of the first near-end duplexer is connected to the near-end downlink signal amplification module and the near-end uplink signal amplification module, respectively; one end of the second near-end duplexer is connected with the base station transmitter, and the other end of the second near-end duplexer is connected with the near-end downlink signal frequency conversion module and the near-end uplink signal frequency conversion module respectively.
Preferably, the first far-end signal input/output module includes a first far-end duplexer, the second far-end signal input/output module includes a second far-end duplexer, and one end of the first far-end duplexer is connected to the far-end downlink signal amplification module and the far-end uplink signal amplification module respectively; one end of the second far-end duplexer is respectively connected with the far-end downlink signal frequency conversion module and the far-end uplink signal frequency conversion module.
Preferably, the first near-end signal input/output module includes a first near-end cavity filter and a first near-end circulator, and the first near-end circulator is connected to the first near-end cavity filter, the near-end downlink signal amplification module and the near-end uplink signal amplification module;
the second near-end signal input and output module comprises a second near-end cavity filter and a second near-end circulator, and the second near-end circulator is connected with the second near-end cavity filter, the near-end downlink signal frequency conversion module and the near-end uplink signal frequency conversion module.
Preferably, the first far-end signal input/output module includes a first far-end cavity filter, a first far-end circulator and a first far-end radio frequency switch, one end of the first far-end circulator is connected with the first far-end cavity filter, one end of the first far-end circulator is connected with the far-end downlink signal amplification module, the other end of the first far-end circulator is connected with the first far-end radio frequency switch, and the first far-end radio frequency switch is connected with the far-end uplink signal amplification module;
the second far-end signal input and output module comprises a second far-end cavity filter, a second far-end circulator and a second far-end radio frequency switch, one end of the second far-end circulator is connected with the second far-end cavity filter, one end of the second far-end circulator is connected with the far-end downlink signal frequency conversion module, the other end of the second far-end circulator is connected with the second far-end radio frequency switch, and the second far-end radio frequency switch is connected with the far-end uplink signal frequency conversion module.
Preferably, the remote terminal further includes a coupler and a synchronization module for performing synchronization demodulation and controlling switching of the uplink and downlink timeslot switches, and the coupler is connected between the remote photoelectric conversion module and the synchronization module.
The invention has the beneficial effects that:
compared with the prior art, the communication equipment for realizing MIMO transmission adopts a frequency conversion mode to realize co-cable transmission of signals, reduces the number of optical fibers, reduces the production cost and enables the wiring to be more convenient.
Drawings
Fig. 1 is a schematic block diagram of an FDD communication apparatus according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a TDD communications device according to an embodiment of the present invention.
Detailed Description
The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
The communication equipment for realizing MIMO (Multiple-Input Multiple-Output) transmission disclosed by the invention realizes the common-cable transmission of signals by adopting a frequency conversion mode, reduces the number of optical fibers, reduces the cost and is suitable for an FDD _ LTE communication system and a TDD _ LTE communication system.
As shown in fig. 1, a communication device for implementing MIMO transmission according to embodiment 1 of the present invention is suitable for processing FDD _ LTE signals, and includes a near-end unit and a far-end unit, where the near-end unit and the far-end unit communicate with each other through a transmission medium, and the transmission medium includes an optical cable, a coaxial cable, and the like. In this embodiment, the near-end unit and the far-end unit only use one optical fiber for signal transmission.
Specifically, the near-end unit is connected to a Base Transceiver Station (BTS) which receives or transmits SISO signals and MIMO signals, and the far-end unit is connected to an Antenna (Antenna). When the downlink signals are processed, the near-end machine receives two downlink signals, wherein the two downlink signals comprise a first downlink signal which is output to the far-end machine without frequency conversion and a second downlink signal which is output to the far-end machine after frequency conversion. The remote machine outputs the received first downlink signal which is not subjected to frequency conversion through an antenna, and outputs the second downlink signal which is subjected to frequency conversion after restoring to the original frequency through the antenna. Similarly, when processing uplink signals, the remote terminal receives two uplink signals through an antenna, the two uplink signals include a first uplink signal which is output to the near-end terminal without frequency conversion and a second uplink signal which is output to the near-end terminal after frequency conversion, the near-end terminal outputs the received first uplink signal which is not frequency converted through a Base Transceiver Station (BTS), and the second uplink signal which is frequency converted is restored to the original frequency and then is output through the Base Transceiver Station (BTS).
As shown in fig. 1, the near-end machine includes a first near-end signal input/output module, a second near-end signal input/output module, a near-end signal power amplifier module, a near-end signal frequency conversion module, a near-end combiner, a near-end splitter, and a near-end photoelectric conversion module. In this embodiment, the first near-end signal input/output module is a first near-end duplexer, and the second near-end signal input/output module is a second near-end duplexer.
Specifically, the SISO signal is dropped into a first downlink signal through the first near-end duplexer, and the MIMO signal is dropped into a second downlink signal through the second near-end duplexer. The SISO signal is split into a first uplink signal through a first remote duplexer and the MIMO signal is split into a second uplink signal through a second remote duplexer. One end of the first near-end duplexer is connected with a Base Transceiver Station (BTS) for transmitting SISO signals, and the other end of the first near-end duplexer is connected with a near-end signal power amplification module; one end of the second near-end duplexer is connected with a Base Transceiver Station (BTS) for transmitting the MIMO signals, and the other end of the second near-end duplexer is connected with a near-end signal frequency conversion module. Of course, except for this embodiment, the positions of the near-end signal power amplifier module and the near-end signal frequency conversion module may be interchanged.
The near-end signal power amplification module is used for amplifying the first uplink signal/the first downlink signal and comprises a near-end downlink signal amplification module and a near-end uplink signal amplification module. The input end of the near-end downlink signal amplification module is connected with a Transmitting (TX) port of the first near-end duplexer, and the output end of the near-end downlink signal amplification module is connected with the input end of the near-end combiner; the input end of the near-end uplink signal amplification module is connected with the output end of the near-end splitter, and the output end of the near-end uplink signal amplification module is connected with a Receiving (RX) port of the first near-end duplexer.
The near-end signal frequency conversion module is used for carrying out frequency conversion processing on the second uplink signal/the second downlink signal and comprises a near-end downlink signal frequency conversion module and a near-end uplink signal frequency conversion module. The input end of the near-end downlink signal frequency conversion module is connected with a Transmitting (TX) port of the second near-end duplexer, and the output end of the near-end combiner is connected with the input end of the combiner; the input end of the near-end uplink signal frequency conversion module is connected with the output end of the near-end splitter, and the output end of the near-end uplink signal frequency conversion module is connected with a Receiving (RX) port of the second near-end duplexer.
The near-end combiner is connected with the near-end signal power amplification module and the near-end signal frequency conversion module and is used for combining the first downlink signal and the second downlink signal and inputting the combined downlink signal into the near-end photoelectric conversion module to be converted into light; the near-end splitter is connected with both the near-end signal power amplification module and the near-end signal frequency conversion module and is used for splitting the uplink signal after being combined and separating a first downlink signal and a second downlink signal. The near-end photoelectric conversion module is connected with both the near-end splitter and the near-end combiner, is used for performing photoelectric conversion on the uplink signal/downlink signal, and is also connected with the photoelectric conversion module in the far-end machine through an optical fiber.
As shown in fig. 1, the remote machine includes a first remote signal input/output module, a second remote signal input/output module, a remote downlink signal processing module, a remote uplink signal processing module, a remote combiner, a remote splitter, and a remote photoelectric conversion module. In this embodiment, the first remote signal input/output module is a first remote duplexer, and the second remote signal input/output module is a second remote duplexer.
Specifically, one end of the first far-end duplexer is connected with the far-end uplink signal processing module and the far-end downlink signal processing module respectively, and the other end of the first far-end duplexer is connected with an antenna for transmitting SISO signals; one end of the second far-end duplexer is respectively connected with the far-end uplink signal processing module and the far-end downlink signal processing module, and the other end of the second far-end duplexer is connected with an antenna for transmitting MIMO signals. In addition to this embodiment, when the positions of the near-end signal power amplifier module and the near-end signal frequency conversion module are changed, the positions of the far-end signal amplifier module and the far-end signal frequency conversion module are also changed accordingly.
The far-end downlink signal processing module comprises a far-end downlink signal amplification module and a far-end downlink signal frequency conversion module. The far-end downlink signal amplification module is used for filtering and amplifying the first downlink signal, the input end of the far-end downlink signal amplification module is connected with the output end of the far-end branching unit, and the output end of the far-end downlink signal amplification module is connected with a Transmitting (TX) port of the first far-end duplexer; the far-end downlink signal frequency conversion module is used for carrying out frequency conversion processing on the second downlink signal and recovering the frequency of the frequency-converted downlink signal to the original frequency, the input end of the far-end downlink signal frequency conversion module is connected with the output end of the far-end branching unit, and the output end of the far-end downlink signal frequency conversion module is connected with a Transmitting (TX) port of the second far-end duplexer.
The far-end uplink signal processing module comprises a far-end uplink signal amplification module and a far-end uplink signal frequency conversion module. The far-end uplink signal amplification module is used for filtering and amplifying the first uplink signal, the input end of the far-end uplink signal amplification module is connected with a Receiving (RX) port of the first far-end duplexer, and the output end of the far-end uplink signal amplification module is connected with the input end of the far-end combiner; the far-end uplink signal frequency conversion module is used for carrying out frequency conversion processing on the second uplink signal, the input end of the far-end uplink signal frequency conversion module is connected with a Receiving (RX) port of the second far-end duplexer, and the output end of the far-end uplink signal frequency conversion module is connected with the input end of the far-end combiner.
The far-end combiner is connected with the far-end uplink signal processing module and used for combining the first uplink signal and the second uplink signal and inputting the combined uplink signal into the far-end photoelectric conversion module to be electrically converted into light; the far-end splitter is connected with the far-end downlink signal processing module and is used for splitting the combined downlink signal and separating a first uplink signal and a second uplink signal. The far-end photoelectric conversion module is connected with the near-end photoelectric conversion module through an optical fiber and used for performing photoelectric conversion on the uplink signal/the downlink signal.
In this embodiment, the near-end uplink signal amplification module and the near-end downlink signal amplification module both include at least one amplifier; the near-end downlink signal frequency conversion module and the near-end uplink signal frequency conversion module respectively comprise an amplifier, a mixer and an amplifier which are sequentially connected in series; the far-end downlink signal amplification module and the far-end uplink signal amplification module both comprise a filter and an amplifier, wherein the filter and the amplifier are sequentially connected in series; the far-end downlink signal frequency conversion module and the far-end uplink signal frequency conversion module respectively comprise a filter, a mixer and an amplifier which are sequentially connected in series.
The working principle of the communication device for realizing the MIMO transmission is as follows:
processing of downlink signals: after being separated by a first near-end duplexer, a first downlink signal enters a near-end downlink signal amplification module, is amplified and then is output to a near-end combiner; and the second downlink signal is separated by the second near-end duplexer and enters the near-end downlink signal frequency conversion module. And the second downlink signal in the near-end downlink signal frequency conversion module is amplified and then input into the mixer, the mixer is mixed with the local oscillation signal, then the frequency of the local oscillation signal is changed into the same frequency as that of the first downlink signal, and the local oscillation signal is amplified again and then output to the near-end combiner. Because the two downlink signal frequencies are the same and are combined in the near-end combiner, the signals are transmitted to the far-end machine through the near-end photoelectric conversion module. The far-end photoelectric conversion module in the far-end machine receives signals and inputs the signals into the far-end branching unit, the far-end branching unit separates downlink signals, and finally two paths of downlink signals are separated, wherein one path of downlink signals is a first downlink signal without frequency conversion, and the other path of downlink signals is a second downlink signal after frequency conversion. The first downlink signal which is not subjected to frequency conversion enters a far-end downlink signal amplification module, is filtered and amplified, then is input into a first far-end duplexer through a Transmitting (TX) port of the first far-end duplexer, and finally is output through an antenna; and the second downlink signal after frequency conversion enters a far-end downlink signal frequency conversion module, and enters a mixer after being filtered. The mixer mixes the local oscillation signal to convert the local oscillation signal into the original frequency, amplifies the original frequency, inputs the amplified frequency into the second far-end duplexer through a Transmitting (TX) port of the second far-end duplexer, and finally outputs the amplified frequency through an antenna.
Processing of uplink signals: the first uplink signal is separated by a first far-end duplexer, enters a far-end uplink signal amplification module, is amplified and then is output to a far-end combiner; the second uplink signal is separated by the second far-end duplexer and enters the far-end uplink signal frequency conversion module, and the signal enters the mixer after being filtered in the far-end uplink signal frequency conversion module. And after the frequency of the two paths of uplink signals is the same, the two paths of uplink signals are combined in the far-end combiner and then are sent to the near-end machine through the far-end photoelectric conversion module. A near-end photoelectric conversion module in the near-end machine receives signals and inputs the signals into a near-end splitter, the near-end splitter separates uplink signals, and finally separates two downlink signals, one first uplink signal which is not subjected to frequency conversion, and the other second uplink signal which is subjected to frequency conversion. The first uplink signal without frequency conversion enters a near-end uplink signal amplification module, is amplified and then input into a first near-end duplexer through a Receiving (RX) port of the first near-end duplexer, and finally is output through a base station transceiver; and the second uplink signal after frequency conversion enters a near-end uplink signal frequency conversion module. And in the near-end up-conversion module, the amplified signals enter a mixer. Mixing with local oscillation signal in mixer, converting to original frequency, amplifying again, inputting to second near-end duplexer via Receiving (RX) port of second near-end duplexer, and outputting via base transceiver station.
As shown in fig. 2, a communication device for implementing MIMO transmission according to embodiment 2 of the present invention is suitable for processing TDD _ LTE signals. Unlike embodiment 1, the first proximal signal input-output module in the proximal machine of embodiment 2 includes a first proximal cavity filter and a first proximal circulator; the second near-end signal input-output module comprises a second near-end cavity filter and a second near-end circulator. One end of the first near-end circulator is connected with the first near-end cavity filter, and the other end of the first near-end circulator is connected with the near-end signal power amplifier module. Similarly, one end of the second near-end circulator is connected with the second near-end cavity filter, and the other end of the second near-end circulator is connected with the near-end signal frequency conversion module. The first far-end signal input and output module in the far-end machine comprises a first far-end cavity filter, a first far-end circulator and a first far-end radio frequency switch, and the second far-end signal input and output module comprises a second far-end cavity filter, a second far-end circulator and a second far-end radio frequency switch. One end of the first far-end circulator is connected with the first far-end cavity filter, one end of the first far-end circulator is connected with the far-end downlink signal amplification module, the other end of the first far-end circulator is connected with the first far-end radio frequency switch, and the first far-end radio frequency switch is connected with the input end of the far-end uplink signal amplification module. One end of the second far-end circulator is connected with the second far-end cavity filter, one end of the second far-end circulator is connected with the second far-end radio frequency switch, the other end of the second far-end circulator is connected with the far-end downlink signal frequency conversion module, and the second far-end radio frequency switch is connected with the input end of the far-end uplink signal frequency conversion module.
Meanwhile, the remote machine is also provided with a coupler and a synchronization module, and the coupler is connected with a Transmitting (TX) port of the remote photoelectric conversion module and a remote splitter. The coupler outputs a coupling signal to the synchronization module, and the synchronization module outputs a high level/low level to control the switching of the upper and lower time slots through a GPIO (general purpose input/output) port after acquiring the synchronization signal, namely, the switching of the downlink time slot into the uplink time slot or the switching of the uplink time slot into the downlink time slot is performed.
The working principle of the communication device for realizing the MIMO transmission is as follows:
processing of downlink signals: the first downlink signal enters a first near-end cavity filter, is filtered and then is output to a first near-end circulator, and the downlink signal output from the first near-end circulator is amplified by a near-end downlink signal amplification module and then is output to a near-end combiner; the second downlink signal enters a second near-end cavity filter, is output to a second near-end circulator after being filtered, the downlink signal output from the second near-end circulator enters a near-end downlink signal frequency conversion module, the first downlink and the second downlink have the same frequency after being subjected to frequency conversion, then enter a near-end combiner, the two downlink signals are combined and output to a near-end photoelectric conversion module, and the near-end photoelectric conversion module transmits the combined downlink signal to a far-end machine. The far-end photoelectric conversion module outputs the signal to the coupler through a Transmitting (TX) port on the far-end photoelectric conversion module after photoelectric change, and the coupler outputs a coupling signal to the synchronization module, so that the synchronization module can control the switching of an uplink time slot switch and a downlink time slot switch. When the time slot switch is switched to the downlink time slot, one path of the downlink signal enters the remote downlink signal amplification module through the remote splitter, and the other path of the downlink signal enters the remote downlink signal frequency conversion module. The filtered wave is amplified and output to a first far-end circulator in a far-end downlink signal amplification module, and the filtered wave is output after being filtered by a first far-end cavity filter; and the frequency is converted back to the original frequency in the far-end downlink signal frequency conversion module, enters the circulator, is filtered by the second far-end cavity filter and is output.
Processing of uplink signals: the first uplink signal enters the first far-end cavity filter, is filtered and then is output to the first far-end circulator. And the second uplink signal enters a second far-end cavity filter, is filtered and then is input into a second far-end circulator. The uplink and downlink time slot switches controlled by the synchronization module are switched, when the uplink time slot is switched, a signal output by the first remote circulator enters the remote uplink signal amplification module through the first remote radio frequency switch, and is input to the remote combiner after being filtered and amplified; and the signals output by the second far-end circulator enter a far-end uplink signal frequency conversion module through a second far-end radio frequency switch, the frequencies of the first uplink and the second uplink are the same after frequency conversion, the signals are input into a far-end combiner, and the two paths of signals are combined in the far-end combiner and then are sent to a near-end machine through a far-end photoelectric conversion module. A near-end photoelectric conversion module in the near-end machine receives signals and inputs the signals into a near-end splitter, the near-end splitter separates two uplink signals, a first uplink signal which is not subjected to frequency conversion enters a near-end uplink signal amplification module, is amplified and then output to a first near-end circulator, and the first near-end circulator outputs and is filtered by a first near-end cavity filter and then output through a Base Transceiver Station (BTS); and the second uplink signal after frequency conversion enters a near-end uplink signal frequency conversion module, is converted into the original frequency and is output to a second near-end circulator after being amplified, and the second uplink signal after output by the second near-end circulator is filtered by a second near-end cavity filter and is output by a Base Transceiver Station (BTS).
Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.

Claims (12)

1. A communication device for implementing MIMO transmission, comprising a near-end unit and a far-end unit, wherein the far-end unit comprises a far-end uplink signal processing module for performing frequency conversion on uplink signals;
the near-end machine receives two paths of downlink signals, one path of downlink signal is output to the far-end machine without frequency conversion, the other path of downlink signal is output to the far-end machine after frequency conversion, the far-end machine outputs the received downlink signal without frequency conversion, and the downlink signal after frequency conversion is recovered to the original frequency and then is output;
the far-end machine receives two paths of uplink signals, one path of uplink signals are output to the near-end machine without frequency conversion, the other path of uplink signals are output to the near-end machine after frequency conversion through the far-end uplink signal processing module, the near-end machine outputs the received uplink signals without frequency conversion, and the uplink signals after frequency conversion are recovered to the original frequency and then output.
2. The communications device of claim 1, wherein the near-end unit comprises
The first near-end signal input-output module and the second near-end signal input-output module are used for inputting/outputting uplink signals/downlink signals;
the near-end signal power amplification module is connected with the first near-end signal input and output module and is used for amplifying the uplink signal/the downlink signal;
the near-end signal frequency conversion module is connected with the second near-end signal input and output module and is used for carrying out frequency conversion on the uplink signal/the downlink signal;
the near-end combiner is connected with the near-end signal power amplification module and the near-end signal frequency conversion module and is used for combining downlink signals;
the near-end splitter is connected with the near-end signal power amplification module and the near-end signal frequency conversion module and is used for splitting the uplink signal;
and the near-end photoelectric conversion module is connected with the near-end splitter and the near-end combiner and is used for performing photoelectric conversion on the uplink signal/the downlink signal.
3. The communications device implementing MIMO transmission of claim 1, wherein the remote unit further comprises
The first remote signal input and output module and the second remote signal input and output module are connected with the remote uplink signal processing module and are used for inputting/outputting uplink signals/downlink signals;
the far-end downlink signal processing module is connected with the first far-end signal input and output module and the second far-end signal input and output module and is used for carrying out signal filtering amplification and frequency conversion on downlink signals;
the far-end branching unit is connected with the far-end downlink signal processing module and is used for branching the downlink signal;
the far-end combiner is connected with the far-end uplink signal processing module and is used for combining uplink signals;
and the far-end photoelectric conversion module is connected with the far-end splitter and the far-end combiner and is used for performing photoelectric conversion on the uplink signal/the downlink signal.
4. The communication device according to claim 2, wherein the near-end signal power amplifier module comprises a near-end downlink signal amplification module and a near-end uplink signal amplification module, and both the near-end downlink signal amplification module and the near-end uplink signal amplification module comprise amplifiers.
5. The communication device according to claim 4, wherein the near-end signal frequency conversion module comprises a near-end downlink signal frequency conversion module and a near-end uplink signal frequency conversion module, and each of the near-end downlink signal frequency conversion module and the near-end uplink signal frequency conversion module comprises an amplifier, a mixer, and an amplifier connected in series in sequence.
6. The communication device according to claim 3, wherein the far-end downlink signal processing module includes a far-end downlink signal amplifying module and a far-end downlink signal frequency converting module, the far-end downlink signal amplifying module includes a filter and an amplifier connected in series with the filter, and the far-end downlink signal frequency converting module includes a filter, a mixer, and an amplifier connected in series in this order.
7. The communication device according to claim 6, wherein the far-end uplink signal processing module comprises a far-end uplink signal amplifying module and a far-end uplink signal frequency converting module, the far-end uplink signal amplifying module comprises a filter and an amplifier connected in series with the filter, and the far-end uplink signal frequency converting module comprises a filter, a mixer, and an amplifier connected in series in this order.
8. The communication device according to claim 5, wherein the first near-end signal input/output module comprises a first near-end duplexer, the second near-end signal input/output module comprises a second near-end duplexer, one end of the first near-end duplexer is connected to the base transceiver station, and the other end of the first near-end duplexer is connected to the near-end downlink signal amplification module and the near-end uplink signal amplification module, respectively; one end of the second near-end duplexer is connected with the base station transmitter, and the other end of the second near-end duplexer is connected with the near-end downlink signal frequency conversion module and the near-end uplink signal frequency conversion module respectively.
9. The communications device according to claim 7, wherein the first remote signal input/output module includes a first remote duplexer, the second remote signal input/output module includes a second remote duplexer, and one end of the first remote duplexer is connected to the remote downlink signal amplification module and the remote uplink signal amplification module, respectively; one end of the second far-end duplexer is respectively connected with the far-end downlink signal frequency conversion module and the far-end uplink signal frequency conversion module.
10. The communication device according to claim 5, wherein the first near-end signal input/output module comprises a first near-end cavity filter and a first near-end circulator, and the first near-end circulator is connected to the first near-end cavity filter, the near-end downlink signal amplification module, and the near-end uplink signal amplification module;
the second near-end signal input and output module comprises a second near-end cavity filter and a second near-end circulator, and the second near-end circulator is connected with the second near-end cavity filter, the near-end downlink signal frequency conversion module and the near-end uplink signal frequency conversion module.
11. The communication device according to claim 7, wherein the first far-end signal input/output module comprises a first far-end cavity filter, a first far-end circulator and a first far-end radio frequency switch, one end of the first far-end circulator is connected to the first far-end cavity filter, one end of the first far-end circulator is connected to the far-end downlink signal amplification module, the other end of the first far-end circulator is connected to the first far-end radio frequency switch, and the first far-end radio frequency switch is connected to the far-end uplink signal amplification module;
the second far-end signal input and output module comprises a second far-end cavity filter, a second far-end circulator and a second far-end radio frequency switch, one end of the second far-end circulator is connected with the second far-end cavity filter, one end of the second far-end circulator is connected with the far-end downlink signal frequency conversion module, the other end of the second far-end circulator is connected with the second far-end radio frequency switch, and the second far-end radio frequency switch is connected with the far-end uplink signal frequency conversion module.
12. The communication device according to claim 7, wherein the remote device further comprises a coupler and a synchronization module for performing synchronous demodulation and controlling switching of uplink and downlink timeslot switches, and the coupler is connected between the remote photoelectric conversion module and the synchronization module.
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