CN102932029A - Long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and method thereof - Google Patents
Long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and method thereof Download PDFInfo
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Abstract
The invention provides a long term evolution (LTE) indoor distribution system and double-path frequency conversion equipment and a double-path frequency conversion method for the LTE indoor distribution system. The double-path frequency conversion equipment comprises a first part and a second part, wherein the first part comprises a first branch and a second branch; the second part comprises a third branch and a fourth branch; the first branch and the second branch are respectively used for transmitting a path of signal sent to the other end; the third branch and the fourth branch are respectively used for transmitting a path of signal received from the other end; the structures of the first branch and the second branch are the same; and the structures of the third branch and the fourth branch are the same. A specific solution is supplied to the LTE indoor distribution system for supporting multiple input and multiple output (MIMO).
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a Long Term Evolution (LTE) indoor distribution system, and a dual-channel frequency conversion device and method thereof.
Background
With the development of the internet, the demand of users for data services is increasing, and meanwhile, investigation shows that more data services are highly emitted to indoor scenes. The Multiple Input Multiple Output (MIMO) technology is one of the important means for Long Term Evolution (LTE) to improve system capacity, but most indoor distribution systems applied to 2G/3G currently are in a traditional manner, do not support MIMO, have low single user throughput and cell throughput, and cannot meet the requirement of LTE system capacity. After the introduction of LTE, an indoor distribution system is transformed on the basis of the existing distribution system, so that the MIMO application requirements of LTE are met, and the method is a necessary trend of network construction.
Fig. 1 is a schematic diagram of a scheme for implementing single-path feeder line transmission of multiple signals by using a frequency conversion combining technology, and the scheme provides a convenient choice for future application of MIMO in an indoor wireless network. A baseband signal is sent out from a baseband processing Unit (BBU) and transmitted to a Remote Radio Unit (RRU) through an optical fiber, two paths of low-power Radio frequency signals sent out by the RRU are respectively subjected to down-conversion at a near-end module to become intermediate frequency signals with different frequencies and are combined for output, then the intermediate frequency signals are combined with the existing Radio frequency system signals, the combined MIMO intermediate frequency signals and other system Radio frequency signals are transmitted on a main feeder, and then the signals are divided into multiple paths through a power divider, so that the use requirement of space division multiplexing is met; when the multi-system signals are transmitted to the remote module, the two paths of LTE intermediate frequency signals are separated from other system radio frequency signals through the branching unit, then the signals are up-converted to the same radio frequency as the RRU output, and the signals are transmitted to two polarization input ports of the dual-polarization indoor distribution antenna, so that the purpose of indoor distribution MIMO is achieved.
However, at present, only the schematic diagram shown in fig. 1 is given, and there is no specific implementation scheme, especially no specific scheme how to implement frequency conversion.
Disclosure of Invention
In view of this, embodiments of the present invention provide an LTE indoor distribution system, and a dual-path frequency conversion device and method thereof, so as to solve the technical problem in the prior art that no specific frequency conversion scheme is available in the LTE indoor distribution system.
In one aspect, a dual-channel frequency conversion device of an LTE indoor distribution system is provided, including:
a first portion and a second portion;
the first portion includes: a first branch and a second branch;
the second portion includes: a third branch and a fourth branch;
the first branch and the second branch are respectively used for transmitting a signal sent to the other end;
the third branch and the fourth branch are respectively used for transmitting a signal received from the other end;
the first branch and the second branch have the same composition structure;
the third branch and the fourth branch have the same composition structure.
In another aspect, an LTE indoor distribution system is provided, which includes the above two-way frequency conversion device.
In another aspect, a dual-path frequency conversion method for an LTE indoor distribution system is provided, including:
respectively transmitting a signal sent to the other end by adopting a first branch and a second branch;
respectively transmitting a signal received from the other end by adopting a third branch and a fourth branch;
the first branch and the second branch have the same composition structure;
the third branch and the fourth branch have the same composition structure.
According to the technical scheme, a double-path frequency conversion scheme is provided, in the double-path frequency conversion scheme, no matter two paths of signals to be sent to the other end or two paths of signals to be received from the other end, the paths through which the two paths of signals pass adopt the same composition structure, so that symmetrical frequency conversion can be realized, frequency conversion processing can be realized, and signal time delay can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an LTE indoor distribution system in the prior art;
FIG. 2 is a schematic structural diagram of an embodiment of a near-end device of the present invention;
FIG. 3 is a schematic diagram of the structure of an embodiment of the remote unit of the present invention;
fig. 4 is a schematic structural view of another embodiment of the near-end machine of the present invention;
FIG. 5 is a schematic structural diagram of another embodiment of a remote unit of the present invention;
fig. 6 is a schematic diagram of downlink signal transmission according to the present invention;
FIG. 7 is a diagram illustrating uplink signal transmission according to the present invention;
fig. 8 is a schematic flow chart of a two-way frequency conversion method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present disclosure provides embodiments of an apparatus comprising a first portion and a second portion; the first portion includes: a first branch and a second branch; the second portion includes: a third branch and a fourth branch; the first branch and the second branch are respectively used for transmitting a signal sent to the other end; the third branch and the fourth branch are respectively used for transmitting a signal received from the other end; the first branch and the second branch have the same composition structure; the third branch and the fourth branch have the same composition structure.
The device may be a near-end machine, in which case the device may be employed in the near-end module of FIG. 1; alternatively, the device may be a remote machine, in which case the device may be implemented in the remote module of fig. 1.
When the equipment is a near-end machine, the other end refers to a far-end machine; alternatively, when the device is a remote device, the other end is a near-end device.
For the near-end unit and the far-end unit, the paths taken by the upstream signal and the downstream signal of the near-end unit and the far-end unit are opposite, for example, when the near-end unit goes downstream, the near-end unit sends the downstream signal to the far-end unit through the first part, and the downstream signal is transmitted through the second part of the far-end unit after reaching the far-end unit. When the uplink signal is transmitted to the near-end machine, the far-end machine transmits the uplink signal to the near-end machine through the first part, and the uplink signal is transmitted through the second part of the near-end machine after reaching the near-end machine.
That is, when the device is a near-end device, the first branch and the second branch are two downlink signal processing branches, respectively, and the third branch and the fourth branch are two uplink signal processing branches; or,
when the device is a far-end machine, the first branch and the second branch are two uplink signal processing branches respectively, and the third branch and the fourth branch are two downlink signal processing branches respectively.
In this embodiment, the first branch and the second branch adopt the same composition structure, and the third branch and the fourth branch adopt the same composition structure, so that the two transmitted or received signals can be transmitted through the same path, that is, through the symmetrical frequency conversion and combining technology, and because the two signals adopt the symmetrical technology, the time delay of the two LTE system signals can be reduced.
Preferably, the third branch and the fourth branch adopt a three-stage frequency conversion mode respectively.
Optionally, in the three-stage frequency conversion mode, the third branch and the fourth branch may respectively include:
the first filter, the first mixer, the intermediate frequency filter, the intermediate frequency amplifier, the second mixer, the second filter, the third mixer, the third filter and the power amplifier are sequentially connected in series;
the first filter is used for carrying out first filtering processing on the signal received from the other end;
the first frequency mixer is used for carrying out first frequency conversion processing on the signal subjected to the first filtering processing;
the intermediate frequency filter is used for performing intermediate frequency filtering processing on the signal subjected to the first frequency conversion processing;
the intermediate frequency amplifier is used for performing intermediate frequency amplification processing on the signal subjected to the intermediate frequency filtering processing;
the second frequency mixer is used for carrying out second frequency conversion processing on the signal subjected to the intermediate frequency amplification processing;
the second filter is used for carrying out second filtering processing on the signal subjected to the second frequency conversion processing;
the third mixer is used for carrying out third frequency conversion processing on the signal subjected to the second filtering processing;
the third filter is used for performing third filtering processing on the signal subjected to the third frequency conversion processing;
the power amplifier is used for performing power amplification processing on the signal subjected to the third filtering processing;
the signals after the power amplification processing are respectively sent to a receiving port of the RRU.
Further, when the apparatus is a remote machine, the third branch and the fourth branch respectively further include:
and an Automatic Level Control (ALC) connected to the power amplifier, and configured to perform Automatic Level Control on the signal after the power amplification process, and send the signal to a receiving port of the RRU.
Optionally, the first branch and the second branch respectively adopt a one-stage frequency conversion mode.
At this time, the first branch and the second branch respectively include:
the fourth mixer and the fourth filter are sequentially connected in series;
the fourth frequency mixer is used for carrying out fourth frequency conversion processing on the signal sent to the other end;
the fourth filter is used for performing fourth filtering processing on the fourth frequency-conversion processed signal;
and the fourth filtered signal is combined and then sent to the other end.
Further, when the apparatus is a remote machine, the first branch and the second branch respectively further include:
and the low-noise amplifier is connected with the fourth mixer in series and is used for carrying out low-noise amplification on the signal sent to the other end and then sending the signal to the fourth mixer.
In connection with the above description, the present invention is directed to the structure of the proximal and distal machines, as shown in fig. 2 and 3.
Taking the near-end machine as an example, the first part adopts a one-stage frequency conversion mode, and the two channels of the first branch and the second branch respectively adopt different local oscillators so as to ensure that the frequency shift frequencies are not overlapped and are combined to the output port.
In the second part, intermediate frequency filtering is needed to distinguish two paths of signals transmitted from the same port at the far end, so that a three-level frequency conversion scheme is adopted: the first two stages of frequency conversion share the local oscillator so as to reduce the influence caused by the frequency drift of the local oscillator; and the third-stage mixing respectively shares the local oscillator with the corresponding downlink channel.
The scheme of the far-end machine is similar to that of the near-end machine, and only the processing of the uplink and the downlink is just exchanged; meanwhile, a low noise amplifier is added in the uplink signal processing process so as to meet the requirement on signal quality.
The functions of the units in fig. 2 or fig. 3 are as follows:
(1) a circulator: the control signal is transmitted in one direction, so that the isolation effect is achieved, and the reverse transmission of the signal is inhibited, and the isolator can be also called as an isolator;
(2) a mixer: the sum and difference processing of the frequency of the processed signal and the frequency of the local oscillation signal is realized;
(3) filters (including intermediate frequency filters): the passing of the required frequency signals is realized, and the signals with unnecessary frequencies are filtered;
(4) a combiner: two or more paths of signals with different frequencies are combined into one path of signal;
(5) the amplifier (in fig. 2 and 3, the intermediate frequency amplifier and the low noise amplifier) may be a radio frequency amplifier or a power amplifier: the output level or power of the radio frequency signal is increased;
(6) a second power divider: dividing one path of signal into two paths of signals according to frequency, wherein the two paths of signals are actually used in the reverse direction of the combiner;
(7) automatic Level Control (ALC): the power of the radio frequency output signal is stabilized at a relatively constant amplitude value;
(8) ports 1 and 2: the input/output port of the near-end unit receives two downlink LTE signals transmitted by the RRU, or inputs two uplink LTE signals to the RRU;
(9) ports 3 and 4: an input/output port of the remote terminal receives two uplink LTE signals transmitted from an antenna port, or inputs two downlink LTE signals to the antenna port;
(10) ports a and b are intermediate connection ports of a near-end machine and a far-end machine, and the two ports are connected with a cable through an indoor distribution system passive device.
The specific circuit implementation schematic diagram adopted by the near-end unit and the far-end unit can be seen in fig. 4 or fig. 5, and fig. 4 and fig. 5 are schematic diagrams of the near-end unit and the far-end unit, respectively, wherein 2620-.
In the embodiment, the symmetrical frequency conversion and combination technology is adopted, so that low time delay of two paths of signals can be realized; by adopting a three-stage frequency conversion mode for the uplink part of the near-end machine and the downlink part of the far-end machine, higher harmonics and various parasitic clutter interferences can be effectively inhibited, and higher output frequency stability and stray inhibition performance are realized; by adopting automatic level control at the end of the remote terminal, the requirement that the MIMO technology should balance the output power of the two-way signals is met.
The schematic structure diagram described in conjunction with fig. 2 or fig. 3 may refer to fig. 6 or fig. 7 for a transmission flow diagram of the downlink signal and the uplink signal.
Fig. 6 is a schematic diagram of downlink signal transmission in the embodiment of the present invention, where a BBU generates a baseband signal and sends the baseband signal to an RRU; the RRU changes the received baseband signals into two paths of LTE system radio frequency signals and respectively sends the two paths of LTE system radio frequency signals to a port 1 and a port 2 of a near-end machine; the near-end machine performs down-conversion processing on the received radio frequency signal, and a specific scheme of the down-conversion processing may be referred to as a primary mixing part, that is, a first part, of fig. 2; converting the radio frequency signal into an intermediate frequency signal after down conversion, combining the two paths of intermediate frequency signals by a combiner to obtain an LTE intermediate frequency signal, and outputting the LTE intermediate frequency signal from a port a of a near-end machine; then, combining with other system signals, wherein the combined signals are multi-system signals and can be transmitted in a cable; the power divider divides the signal into multiple paths to meet the requirement of space division multiplexing. The multi-system signal is input from a port b of the remote machine and is divided into two paths of intermediate frequency signals through a splitter; each path of intermediate frequency signal is subjected to up-conversion processing, and a specific scheme of the up-conversion processing can be referred to a three-level mixing part shown in fig. 3, namely a second part; the signal after the up-conversion processing is an LTE radio frequency signal; the two paths of LTE radio frequency signals can be input into an indoor dual-polarized antenna through a port 3 and a port 4 of a remote terminal respectively so as to realize MIMO.
Fig. 7 is a schematic diagram of uplink signal transmission in an embodiment of the present invention, where the transmission direction is opposite to that of the downlink signal. The indoor dual-polarized antenna respectively transmits the received two paths of LTE radio frequency signals to a port 3 and a port 4 of the remote terminal; the first-stage frequency conversion part of the remote terminal performs down-conversion processing on the LTE radio frequency signal to obtain two paths of intermediate frequency signals; after the two paths of intermediate frequency signals and other system signals pass through the combiner, multi-system signals are obtained, and the multi-system signals can be output from a port b of the far-end machine. The power divider divides the signal into multiple paths to meet the requirement of space division multiplexing. The signals are divided into LTE intermediate frequency signals and other system signals through a splitter; the LTE intermediate frequency signal is input from a port a of a near-end machine, the LTE intermediate frequency signal is changed into two paths of intermediate frequency signals through a splitter, a three-level frequency conversion part of the near-end machine performs up-conversion on the intermediate frequency signal to change the intermediate frequency signal into an LTE system radio frequency signal, then the two paths of LTE system radio frequency signals are respectively input to the RRU, and a baseband signal is obtained after the two paths of LTE system radio frequency signals are processed by the RRU and.
Fig. 8 is a schematic flow chart of an embodiment of a two-way frequency conversion method of the present invention, including:
step 81: respectively transmitting a signal sent to the other end by adopting a first branch and a second branch;
step 82: respectively transmitting a signal received from the other end by adopting a third branch and a fourth branch;
the first branch and the second branch have the same composition structure;
the third branch and the fourth branch have the same composition structure.
Optionally, the respectively transmitting a signal received from the other end by using the third branch and the fourth branch includes:
and respectively transmitting a path of signal received from the other end by adopting a three-stage frequency conversion mode.
Further, the three-stage frequency conversion mode may specifically include:
and sequentially carrying out first filtering processing, first frequency mixing processing, intermediate frequency filtering processing, intermediate frequency amplification processing, second frequency mixing processing, second filtering processing, third frequency mixing processing, third filtering processing and power amplification processing on the received signals.
Optionally, the using the third branch and the fourth branch to transmit one path of signals received from the other end respectively may further include:
and carrying out ALC processing on the signal subjected to the three-stage frequency conversion.
Optionally, the first mixer and the second mixer use the same local oscillator.
Optionally, the respectively transmitting one signal sent to the other end by using the first branch and the second branch includes:
a mixer and a filter are adopted to respectively transmit a signal sent to the other end.
Further, adopt first branch road and second branch road to transmit respectively that send the signal for the other end all the way, still include:
and processing the signal sent to the other end by using a low noise amplifier so as to transmit the processed signal by using a mixer and a filter.
In the embodiment, the symmetrical frequency conversion and combination technology is adopted, so that low time delay of two paths of signals can be realized; by adopting a three-stage frequency conversion mode for the uplink part of the near-end machine and the downlink part of the far-end machine, higher harmonics and various parasitic clutter interferences can be effectively inhibited, and higher output frequency stability and stray inhibition performance are realized; by adopting automatic level control at the end of the remote terminal, the requirement that the MIMO technology should balance the output power of the two-way signals is met.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. The utility model provides a two-way frequency conversion equipment of indoor distribution system of LTE which characterized in that includes:
a first portion and a second portion;
the first portion includes: a first branch and a second branch;
the second portion includes: a third branch and a fourth branch;
the first branch and the second branch are respectively used for transmitting a signal sent to the other end;
the third branch and the fourth branch are respectively used for transmitting a signal received from the other end;
the first branch and the second branch have the same composition structure;
the third branch and the fourth branch have the same composition structure.
2. The apparatus according to claim 1, wherein the third branch and the fourth branch both adopt a three-stage frequency conversion method.
3. The apparatus of claim 2, wherein the third and fourth branches each comprise:
the first filter, the first mixer, the intermediate frequency filter, the intermediate frequency amplifier, the second mixer, the second filter, the third mixer, the third filter and the power amplifier are sequentially connected in series;
the first filter is used for carrying out first filtering processing on the signal received from the other end;
the first frequency mixer is used for carrying out first frequency conversion processing on the signal subjected to the first filtering processing;
the intermediate frequency filter is used for performing intermediate frequency filtering processing on the signal subjected to the first frequency conversion processing;
the intermediate frequency amplifier is used for performing intermediate frequency amplification processing on the signal subjected to the intermediate frequency filtering processing;
the second frequency mixer is used for carrying out second frequency conversion processing on the signal subjected to the intermediate frequency amplification processing;
the second filter is used for carrying out second filtering processing on the signal subjected to the second frequency conversion processing;
the third mixer is used for carrying out third frequency conversion processing on the signal subjected to the second filtering processing;
the third filter is used for performing third filtering processing on the signal subjected to the third frequency conversion processing;
the power amplifier is used for performing power amplification processing on the signal subjected to the third filtering processing;
the signals after the power amplification processing are respectively sent to a receiving port of the RRU.
4. The apparatus of claim 3, wherein when the apparatus is a remote machine, the third and fourth branches each further comprise:
and the ALC is connected with the power amplifier and is used for carrying out automatic level control processing on the signal after the power amplification processing and then sending the signal to a receiving port of the RRU.
5. The apparatus of claim 3,
the first frequency mixer and the second frequency mixer use the same local oscillator.
6. The apparatus according to any of claims 1-5, wherein the first branch and the second branch each comprise:
the fourth mixer and the fourth filter are sequentially connected in series;
the fourth frequency mixer is used for carrying out fourth frequency conversion processing on the signal sent to the other end;
the fourth filter is used for performing fourth filtering processing on the fourth frequency-conversion processed signal;
and the fourth filtered signal is combined and then sent to the other end.
7. The apparatus of claim 6, wherein when the apparatus is a remote machine, the first and second branches each further comprise:
and the low-noise amplifier is connected with the fourth mixer in series and is used for carrying out low-noise amplification on the signal sent to the other end and then sending the signal to the fourth mixer.
8. An LTE indoor distribution system comprising the apparatus of any of claims 1-7.
9. A double-path frequency conversion method of an LTE indoor distribution system is characterized by comprising the following steps:
respectively transmitting a signal sent to the other end by adopting a first branch and a second branch;
respectively transmitting a signal received from the other end by adopting a third branch and a fourth branch;
the first branch and the second branch have the same composition structure;
the third branch and the fourth branch have the same composition structure.
10. The method of claim 9, wherein said transmitting a signal received from said another end using a third branch and a fourth branch, respectively, comprises:
and respectively transmitting a path of signal received from the other end by adopting a three-stage frequency conversion mode.
11. The method of claim 10, wherein said transmitting a signal received from said another end using a third branch and a fourth branch, respectively, further comprises:
and carrying out ALC processing on the signal subjected to the three-stage frequency conversion.
12. The method according to any one of claims 9-11, wherein said using the first branch and the second branch to transmit a signal sent to the other end separately comprises:
a mixer and a filter are adopted to respectively transmit a signal sent to the other end.
13. The method of claim 12, wherein the using the first branch and the second branch to transmit a signal sent to the other end respectively further comprises:
and processing the signal sent to the other end by using a low noise amplifier so as to transmit the processed signal by using a mixer and a filter.
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| CN104301909A (en) * | 2014-05-05 | 2015-01-21 | 河南普世通信科技有限公司 | Indoor distribution system MIMO single cable covering method and system |
| WO2015070782A1 (en) * | 2013-11-13 | 2015-05-21 | 华为技术有限公司 | Indoor distribution system, local unit and remote unit |
| CN105491577A (en) * | 2016-01-22 | 2016-04-13 | 北京邮电大学 | Asymmetric single-double current hybrid indoor coverage system |
| CN105959019A (en) * | 2016-06-01 | 2016-09-21 | 中国电子科技集团公司第四十研究所 | Large-bandwidth communication signal receiving and analyzing device and method based on dual-channel phase superposition |
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| CN113965169A (en) * | 2021-12-22 | 2022-01-21 | 中国移动通信有限公司研究院 | Frequency conversion method, device and system |
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