CN103607230A - Method and system for transmitting MIMO signal on the basis of balanced wire - Google Patents
Method and system for transmitting MIMO signal on the basis of balanced wire Download PDFInfo
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Abstract
The invention discloses a method and a system for transmitting an MIMO signal on the basis of a balanced wire. The method comprises that each path of the MIMO signal to be distributed is frequency-shifted to a same preset frequency; each path of the MIMO signal after frequency-shifting is fed to a corresponding winding of the balanced wire, and each path of the MIMO signal after frequency-shifting is transmitted to a far-end according to the preset frequency; and each path of the MIMO signal on the balanced wire is extracted by the far-end, and each path of the MIMO signal is reduced to an original frequency. According to the technical scheme, multipath of the MIMO signals are transmitted to the far-end device via the same frequency so that frequency resources occupied in transmission of the multipath of the MIMO signals are greatly compressed, and thus the method has advantages of being low in transmission cost, and the limited frequency resources are fully utilized.
Description
Technical Field
The invention relates to the field of communication, in particular to a method and a system for transmitting MIMO signals based on a balanced line.
Background
In an existing communication system, after a near-end device receives a MIMO (Multiple-input Multiple-output-Out-put) signal sent by a base station, in order to ensure coverage of an indoor signal of a far-end, a MIMO signal to be distributed at the near-end is generally transmitted to a corresponding far-end device, and is distributed to an indoor area through the far-end device.
In the prior art, a common method is to adopt a frequency shift technology, in order to meet the requirement of the near-end MIMO signals to be distributed on the isolation degree in the process of transmitting the signals to the far-end equipment, frequency shift is performed on each path of MIMO signals to be distributed to different frequencies respectively, so that the signals are separated in the frequency domain, namely, different MIMO signals occupy a section of frequency range, and then the signals are transmitted to the far-end through a coaxial cable, and the signals are extracted from the far-end and are respectively processed and then sent to an antenna for distribution. The disadvantages of this method are: the multi-path MIMO signals occupy a large amount of frequency resources, are only transmitted by a coaxial cable with a large frequency bandwidth, and cannot be transmitted by a balance line (such as a twisted pair) with a limited transmission bandwidth; in addition, coaxial cables are more costly than balanced lines and have a higher transmission cost.
Disclosure of Invention
The invention aims to provide a method and a system for transmitting MIMO signals based on a balanced line, which can transmit multi-path MIMO signals through the balanced line and improve the utilization rate of frequency resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of transmitting MIMO signals based on balanced lines, comprising:
shifting the frequency of each path of MIMO signals to be distributed to the same preset frequency;
feeding the frequency-shifted MIMO signals into corresponding windings of a balance line, and transmitting the frequency-shifted MIMO signals to a far end according to the preset frequency;
and extracting each path of MIMO signal on the balance line at the far end, and restoring each path of MIMO signal to the original frequency.
Wherein, after restoring each path of MIMO signals to the original frequency, the method further comprises:
and controlling the corresponding antenna to distribute each path of MIMO signals.
The feeding of each channel of frequency-shifted MIMO signals into a corresponding winding of the balance line, and the transmission of each channel of frequency-shifted MIMO signals to the far end according to the preset frequency specifically include:
when each path of MIMO signal is a frequency division duplex signal, feeding each path of MIMO signal after frequency shift and a pilot signal of each path of MIMO signal into a corresponding winding of a balance line, and transmitting each path of MIMO signal after frequency shift and the pilot signal to a far end according to the preset frequency;
or,
when each path of MIMO signal is a time division duplex signal, feeding each path of MIMO signal after frequency shift, a pilot signal of each path of MIMO signal and a synchronous signal into a corresponding winding of a balance line, and transmitting each path of MIMO signal and the synchronous signal to a far end according to the preset frequency;
the pilot frequency information is used as a reference frequency source when restoring each path of MIMO signal frequency so as to ensure the accuracy of restoring each path of MIMO signal frequency and prevent frequency offset caused by factors such as environmental temperature and the like when in long-term use;
the remote end extracts each path of MIMO signal on the balance line and restores each path of MIMO signal to the original frequency, specifically,
extracting each path of MIMO signal and the pilot signal on the corresponding winding of the balance line at a far end; restoring each path of MIMO signals to original frequency according to the pilot signals; or
Extracting each path of MIMO signal, the pilot signal and the synchronous signal on the corresponding winding of the balance line at a far end; and restoring each path of MIMO signal to the original frequency according to the pilot signal.
Wherein, the different antennas are controlled to distribute each path of MIMO signals, specifically,
carrying out power balance processing on each path of MIMO signal;
and controlling different antennas to distribute the MIMO signals of each path after the power balance processing.
Wherein the balance line is a type 3 line, a type 4 line, a type 5 line, a super type 5 line, a type 6 line or a type 7 line.
A system for transmitting MIMO signals based on a balanced line comprises a near-end device, a far-end device for distributing each path of MIMO signals of the near-end device, and a balanced line connecting the near-end device and the far-end device,
the near-end equipment is used for shifting the frequency of each path of MIMO signals to be distributed to the same preset frequency and feeding each path of MIMO signals after frequency shifting to the corresponding winding of the balance line;
the balance line is used for transmitting each path of MIMO signals after frequency shift according to the preset frequency;
the remote device is configured to extract each MIMO signal on the balance line, and restore each MIMO signal to an original frequency.
And the remote equipment is also used for controlling the corresponding antenna to distribute each path of MIMO signals.
Wherein the proximal device, in particular for,
shifting the frequency of each path of MIMO signals to be distributed to the same preset frequency;
when each path of MIMO signal is a frequency division duplex signal, feeding each path of MIMO signal after frequency shift and a pilot signal of each path of MIMO signal into a corresponding winding of the balance line; or,
when each path of MIMO signal is a time division duplex signal, feeding each path of MIMO signal after frequency shift, pilot signal and synchronous signal of each path of MIMO signal into corresponding winding of the balance line;
the pilot frequency information comprises frequency track information of each path of MIMO signal;
the remote device, in particular for use,
extracting each path of MIMO signal and the pilot signal on the corresponding winding of the balance line, and restoring each path of MIMO signal to the original frequency according to the pilot signal; or,
and extracting each path of MIMO signal and the synchronous signal on the corresponding winding of the balance line, and restoring each path of MIMO signal to the original frequency according to the pilot signal.
The balance line is further configured to transmit the pilot signal and/or the synchronization signal to a remote device according to the preset frequency;
the remote device is further configured to perform power balance processing on each path of MIMO signals, and control different antennas to distribute each path of MIMO signals after the power balance processing.
Wherein the balance line is a type 3 line, a type 4 line, a type 5 line, a super type 5 line, a type 6 line or a type 7 line.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention fully utilizes the isolation between the windings of the existing balance line by shifting the frequency of the multi-path MIMO signals to be distributed to the same lower frequency, can transmit the multi-path MIMO signals to a far end at the same lower frequency through the balance line for distribution, greatly compresses the frequency resources required by transmitting the multi-path MIMO signals, and has the advantages of low transmission cost and full utilization of limited frequency resources.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating an embodiment of a method for transmitting MIMO signals based on balanced lines according to the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of a system for transmitting MIMO signals based on balanced lines according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, a method for transmitting MIMO signals based on balanced lines in the present embodiment specifically includes the following steps S1-S3:
and step S1, frequency shifting each path of MIMO signal to be distributed to the same preset frequency, so that each path of MIMO signal is suitable for being transmitted to a far end through a balance line for distribution.
In this embodiment, the balanced line may be a twisted pair, or a combination of twisted pairs based on twisted pairs, such as a 3-type line, a 4-type line, a 5-type line, a super 5-type line, a 6-type line, a 7-type line, etc. When the transmission frequency is low (0-100 MHz), the isolation between the windings of the balance line is more than 25db, and the isolation required by MIMO signal transmission is basically met. As the transmission frequency increases, the isolation between the windings decreases, the transmission loss is also large, and the MIMO transmission is no longer suitable. Therefore, the preset frequency range in the embodiment of the present invention is 1-100MHz, so as to satisfy the isolation required for MIMO signal transmission. That is, step S1 is to shift the frequency of each MIMO signal to be distributed to a frequency point between 1-100 MHz.
Preferably, the balanced line in the embodiment of the present invention is preferably a category 5 shielded twisted pair, so as to ensure transmission performance such as improved isolation between each pair of windings. The 5-type shielded twisted pair comprises 4 pairs of windings, so that 1 5-type twisted pair can transmit 4 paths of MIMO signals on the same frequency, and 2 x 4 uplink and downlink signal transmission is realized; 2, 5 twisted pairs can transmit 8 MIMO signals on the same frequency, and 2 × 8 uplink and downlink signal transmission is realized; the corresponding number (denoted by N) of twisted pairs is set according to the actual MIMO signal, and 2 x 4N signal transmission can be realized.
And step S2, feeding the frequency-shifted MIMO signals into corresponding windings of the balanced line, and transmitting the frequency-shifted MIMO signals to a remote end according to the preset frequency.
In specific implementation, when each path of MIMO signal is a Frequency Division Duplex (FDD) signal, each path of MIMO signal after Frequency shift and a pilot signal of each path of MIMO signal are fed into a corresponding winding of a balanced line for transmission. If each path of MIMO signal to be distributed is a Time Division Duplex (TDD) signal (such as a MIMO signal to be distributed of TD-SCDMA or TD-CDMA system), each path of MIMO signal after frequency shift, a pilot signal of each path of MIMO signal, and a synchronization signal are fed into a corresponding winding of the balanced line together for transmission. The pilot information in this embodiment includes the trace information (e.g., frequency shift range information during frequency shift processing) of each MIMO signal, and is mainly used for performing frequency recovery on each MIMO signal by a remote end. The synchronization signal is mainly used for controlling the switching of uplink and downlink. In the embodiment of the invention, the radio frequency of each path of MIMO signal to be distributed is the same, and the transmitted data streams are different.
And step S3, extracting each path of MIMO signal on the balance line by the far end, and restoring each path of MIMO signal to the original frequency.
In specific implementation, each path of MIMO signal and the pilot signal on the corresponding winding of the balance line are extracted at a remote end (if the signal is a TDD signal, each path of MIMO signal, the pilot signal, and a synchronization signal are extracted), and each path of MIMO signal is restored to an original frequency (i.e., a frequency of a corresponding base station air interface signal) according to the pilot signal. And then, carrying out power balance processing on each path of recovered MIMO signals, and controlling different antennas to distribute each path of MIMO signals subjected to power balance processing to an indoor area. The pilot signal comprises the trace information corresponding to each path of MIMO signal and is used as a reference frequency source when the frequency of each path of MIMO signal is restored, so that the accuracy of restoring the frequency of each path of MIMO signal is ensured and the frequency offset caused by factors such as environmental temperature and the like when the pilot signal is used for a long time is prevented. The method is particularly used as a reference frequency source of a frequency tracking circuit for restoring the frequency of each path of MIMO signals.
It should be noted that, if the method for transmitting MIMO signals based on balanced lines in the above embodiment of the present invention is combined with the existing frequency division multiplexing technology, that is, when multiple MIMO signals are transmitted between the near end and the far end, the frequency division multiplexing technology is combined, MIMO signals greater than 4 channels can be transmitted through 1 5 types of twisted pairs, and uplink and downlink signal transmission greater than 2 × 4 is implemented, for example, uplink and downlink signal transmission of 4 × 4 can be implemented through 1 5 types of twisted pairs.
By the embodiment of the invention, the multipath MIMO signals to be distributed are shifted to the same lower frequency, the isolation between the windings of the existing balance line is fully utilized, the multipath MIMO signals can be transmitted to the remote equipment at the same frequency through the balance line with lower cost, the frequency resources occupied in the multipath MIMO signal transmission are greatly compressed, and the method has the advantages of low transmission cost and full utilization of the limited frequency resources.
The following is an embodiment of a system for transmitting MIMO signals based on balanced lines according to an embodiment of the present invention. Embodiments of the system belong to the same concept as the above method embodiments, and details not described in detail in the embodiments of the system may refer to the above method embodiments.
Referring to fig. 2, the system for transmitting MIMO signals based on balanced lines of the present embodiment includes: the near-end device 10, the far-end device 20 for distributing the MIMO signals of the near-end device 10, and further include a balanced line 30 connecting the near-end device 10 and the far-end device 20.
The near-end device 10 first shifts the frequency of each MIMO signal to be distributed to the same preset frequency, so that the MIMO signal is suitable for transmission through the balanced line 30, and the preset frequency range of this embodiment is 1-100MHz, so as to satisfy the isolation required for MIMO signal transmission. And then feeding the frequency-shifted MIMO signals into corresponding windings of the balance line 30, and transmitting the frequency-shifted MIMO signals by the balance line 30 according to the preset frequency. The balanced line of the present embodiment may be a twisted pair, or a combination of twisted pairs based on twisted pairs. The remote device 20 extracts the MIMO signals on the balanced line and restores the MIMO signals to the original frequency.
The balanced line 30 in this embodiment may be a 3-type line, a 4-type line, a 5-type line, an extra 5-type line, a 6-type line, or a 7-type line, and preferably is a 5-type shielded twisted pair, and includes 4 pairs of windings, and 1 of the 5-type twisted pair may transmit 4 MIMO signals at the same frequency, so as to implement 2 × 4 uplink and downlink signal transmission; the 25 twisted pairs can transmit 8 MIMO signals on the same frequency, and 2 × 8 uplink and downlink signal transmission is realized.
Preferably, the near-end device 10 is specifically configured to shift the frequency of each MIMO signal to be distributed to the same preset frequency, and when each MIMO signal is a frequency division duplex signal, feed each frequency-shifted MIMO signal and a pilot signal of each MIMO signal into a corresponding winding of the balance line for transmission (or, when each MIMO signal is a time division duplex signal, feed each frequency-shifted MIMO signal, a pilot signal of each MIMO signal, and a synchronization signal into a corresponding winding of the balance line for transmission). The remote device 20 extracts the MIMO signals and the pilot signals on the corresponding winding of the balanced line (if the signals are TDD mode signals, the MIMO signals, the pilot signals and the synchronization signals on the corresponding winding of the balanced line are extracted); then, each path of MIMO signal is restored to the original frequency according to the pilot signal. In this embodiment, the radio frequency of each path of MIMO signals to be distributed is the same, and the transmitted data streams are different.
In this embodiment, the remote device 20 further controls the corresponding antenna to distribute each path of MIMO signals after restoring each path of MIMO signals to the original frequency. Specifically, the restored MIMO signals are subjected to power balance processing, and then different antennas are controlled to distribute the MIMO signals after the power balance processing.
By implementing the embodiment of the invention, the multipath MIMO signals to be distributed are shifted to the same lower frequency, the isolation degree between the windings of the existing balance line is fully utilized, the multipath MIMO signals can be transmitted to the remote equipment through the same frequency, the frequency resources occupied in the multipath MIMO signal transmission are greatly compressed, and the method has the advantages of low transmission cost and full utilization of the limited frequency resources.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, any modifications, equivalents and improvements made within the spirit and principle of the present invention are within the scope of the present invention.
Claims (10)
1. A method for transmitting MIMO signals based on balanced lines, comprising:
shifting the frequency of each path of MIMO signals to be distributed to the same preset frequency;
feeding the frequency-shifted MIMO signals into corresponding windings of a balance line, and transmitting the frequency-shifted MIMO signals to a far end according to the preset frequency;
and extracting each path of MIMO signal on the balance line at the far end, and restoring each path of MIMO signal to the original frequency.
2. The method of claim 1, wherein after restoring the MIMO signals to the original frequencies, further comprising:
and controlling the corresponding antenna to distribute each path of MIMO signals.
3. The method according to claim 2, wherein the feeding of the frequency-shifted MIMO signals into the corresponding winding of the balanced line transmits the frequency-shifted MIMO signals to a remote end according to the preset frequency, specifically:
when each path of MIMO signal is a frequency division duplex signal, feeding each path of MIMO signal after frequency shift and a pilot signal of each path of MIMO signal into a corresponding winding of a balance line, and transmitting each path of MIMO signal after frequency shift and the pilot signal to a far end according to the preset frequency; or,
when each path of MIMO signal is a time division duplex signal, feeding each path of MIMO signal after frequency shift, a pilot signal of each path of MIMO signal and a synchronous signal into a corresponding winding of a balance line, and transmitting each path of MIMO signal and the synchronous signal to a far end according to the preset frequency;
the pilot frequency information comprises frequency track information of each path of MIMO signal;
the remote end extracts each path of MIMO signal on the balance line and restores each path of MIMO signal to the original frequency, specifically,
extracting each path of MIMO signal and the pilot signal on the corresponding winding of the balance line at a far end; restoring each path of MIMO signals to original frequency according to the pilot signals; or
Extracting each path of MIMO signal, the pilot signal and the synchronous signal on the corresponding winding of the balance line at a far end; and restoring each path of MIMO signal to the original frequency according to the pilot signal.
4. The method according to claim 1, wherein the controlling of different antennas distributes the respective MIMO signals, in particular,
carrying out power balance processing on each path of MIMO signal;
and controlling different antennas to distribute the MIMO signals of each path after the power balance processing.
5. The method of claim 1, wherein the balance line is a class 3 line, a class 4 line, a class 5 line, a super class 5 line, a class 6 line, or a class 7 line.
6. A system for transmitting MIMO signals based on a balanced line comprises a near-end device and a far-end device used for distributing each path of MIMO signals of the near-end device, and is characterized by also comprising a balanced line connecting the near-end device and the far-end device,
the near-end equipment is used for shifting the frequency of each path of MIMO signals to be distributed to the same preset frequency and feeding each path of MIMO signals after frequency shifting to the corresponding winding of the balance line;
the balance line is used for transmitting each path of MIMO signals after frequency shift according to the preset frequency;
the remote device is configured to extract each MIMO signal on the balance line, and restore each MIMO signal to an original frequency.
7. The system of claim 6, wherein the remote device is further configured to control the corresponding antenna to distribute each MIMO signal.
8. System according to claim 7, characterized in that the proximal device, in particular for,
shifting the frequency of each path of MIMO signals to be distributed to the same preset frequency;
when each path of MIMO signal is a frequency division duplex signal, feeding each path of MIMO signal after frequency shift and a pilot signal of each path of MIMO signal into a corresponding winding of the balance line; or,
when each path of MIMO signal is a time division duplex signal, feeding each path of MIMO signal after frequency shift, pilot signal and synchronous signal of each path of MIMO signal into corresponding winding of the balance line;
the pilot frequency information is used as a reference frequency source when restoring each path of MIMO signal frequency so as to ensure the accuracy of restoring each path of MIMO signal frequency and prevent frequency offset caused by factors such as environmental temperature and the like when in long-term use;
the remote device, in particular for use,
extracting each path of MIMO signal and the pilot signal on the corresponding winding of the balance line, and restoring each path of MIMO signal to the original frequency according to the pilot signal; or,
and extracting each path of MIMO signal and the synchronous signal on the corresponding winding of the balance line, and restoring each path of MIMO signal to the original frequency according to the pilot signal.
9. The system of claim 8, wherein the balance line is further configured to transmit the pilot signal and/or the synchronization signal to a remote device according to the predetermined frequency;
the remote device is further configured to perform power balance processing on each path of MIMO signals, and control different antennas to distribute each path of MIMO signals after the power balance processing.
10. The system of claim 1, wherein the balance line is a class 3 line, a class 4 line, a class 5 line, a super class 5 line, a class 6 line, or a class 7 line.
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| US20100255792A1 (en) * | 1999-10-21 | 2010-10-07 | Broadcom Corporation | Adaptive radio transceiver with an antenna matching circuit |
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