CN100375403C - Apparatus for common-frequency radio communication system interplate local oscillator multi-backup - Google Patents
Apparatus for common-frequency radio communication system interplate local oscillator multi-backup Download PDFInfo
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- CN100375403C CN100375403C CNB2005100330337A CN200510033033A CN100375403C CN 100375403 C CN100375403 C CN 100375403C CN B2005100330337 A CNB2005100330337 A CN B2005100330337A CN 200510033033 A CN200510033033 A CN 200510033033A CN 100375403 C CN100375403 C CN 100375403C
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Abstract
The present invention relates to a device for the interplate local oscillator multiplex back-up of a common-frequency wireless communication system. The system has at least two single plates, and each single plate is provided with a first single-pole double-throw electronic switch; the exterior of the single-pole end of the first single-pole double-throw electronic switch is connected with an external port, and double-throw ends of the first single-pole double-throw electronic switch are respectively connected with a 1/2 power divider and a branch circuit formed by orderly connecting a second n-shaped network, a first amplifier and a third n-shaped network in series; a single-pole single-throw electronic switch is arranged between the first n-shaped network and the 1/2 power divider; a second single-pole double-throw electronic switch is arranged among the third n-shaped network, the 1/2 power divider and the fourth n-shaped network, and the union end of the fourth n-shaped network is the single-pole end of the second single-pole double-throw electronic switch; each electronic switch is controlled by a control unit so as to enable each electronic switch to be switched on or switched off. Because the present invention uses multiplex switches in multiple single plates, which are controlled by the control unit, the present invention enables the local oscillation between the single plates to multiplex. The present invention has the advantages of simple structure and low cost.
Description
Technical Field
The invention relates to a same-frequency communication system with higher requirement on the coherence of multi-channel signals in the field of mobile communication, such as a multiplexing backup device of a communication system using an intelligent antenna, in particular to a device for local oscillator multiplexing backup between same-frequency wireless communication system boards.
Background
In the field of mobile communication, more and more communication systems, such as the third generation mobile communication system and the developed fourth generation mobile communication system, are applied to the smart antenna, which requires good coherence of signals of corresponding channels in many related algorithms of the smart antenna. And to make them have better coherence, it is better to make them use the same local oscillator, the same phase-locked loop PLL, so that the trend of their changes, including, will be consistent, so that the algorithm of the smart antenna can be better guaranteed.
Because the current intelligent antenna generally adopts a circular matrix of 8 antennas, the simplest scheme is to make 8 transceiving channels in the same printed circuit board PCB, but in a more complex system such as a TD-SCDMA system, the volume of a base station can only be made larger in order to realize the required functions, and if the number of antennas in the antenna matrix is further increased, the pressure for realizing the PCB is increased because all the channels are integrated on a single board. Since the number of layers of the PCB board must be increased or a high requirement is made on the structure in order to secure the rf performance, in addition to the necessity of the increase in volume, which leads to a drastic increase in cost.
In another scheme, each transmitting-receiving channel is made into a single PCB, and the local vibration source is also made into a board and then distributed to each channel. In this way, since each PCB must be structured to ensure its rf performance, the volume and cost are higher than in the previous solution. And when the last carrier frequency module is configured, the cables for distributing the local oscillator power to each channel are very numerous and difficult to wire.
In order to solve the above problems, the prior art proposes an application scheme of the local oscillator multiplexing device, that is, a certain reasonable number of transceiving channels are integrated on one PCB, for example, 4 transceiving channels are provided on one PCB, and then the PCBs are used in combination. Therefore, a certain integration level is ensured, the size is not too large, and the cost is not increased sharply due to the increase of the channel. But this also raises the problem of how to make the transmit-receive channels on different PCBs share one local oscillator and PLL.
Therefore, the prior art has certain defects and needs to be improved and developed.
Disclosure of Invention
The invention aims to provide a device for local oscillator multiplexing backup between boards of a same-frequency wireless communication system, which realizes local oscillator multiplexing and backup between single boards by the same-frequency communication system with higher requirement on the coherence of signals of all channels.
The technical scheme of the invention is as follows:
a local oscillation multiplexing backup device between same-frequency wireless communication system boards is characterized in that a local oscillation source and a corresponding phase-locked loop thereof are arranged on a single board of the system, the single board is connected with an 1/2 power divider through a first n-shaped network, the 1/2 power divider is connected with a fourth n-shaped network, and the fourth n-shaped network is provided for the single board to use after passing through a second amplifier; wherein,
the system has at least two single boards, and each single board is provided with
The single-pole end of the first single-pole double-throw electronic switch is externally connected with an external port, and the double-throw end of the first single-pole double-throw electronic switch is respectively connected with the 1/2 power divider and a branch formed by serially connecting a second n-shaped network, a first amplifier and a third n-shaped network in sequence;
a single-pole single-throw electronic switch is arranged between the first n-shaped network and the 1/2 power divider;
a second single-pole double-throw electronic switch is arranged among the third n-shaped network, the 1/2 power divider and the fourth n-shaped network, and the connecting end of the fourth n-shaped network is taken as the single-pole end of the fourth n-shaped network; and is
And the electronic switches are controlled to be opened and closed by a control unit, and the local oscillation source and the phase-locked loop in the single board are subjected to multiplexing backup.
In the device, the single board is connected to the external port through a single coaxial cable.
In the device, the number of the single boards is two, and the isolation of each electronic switch is greater than 25 dB.
The device, wherein, the same switch is adopted to each electronic switch.
The apparatus of, wherein the apparatus provides power management to the amplifiers in a time division duplex system to turn off unused branch amplifiers.
The device, wherein the device further adds power management to each phase-locked loop in a system with low requirement on the response time, so as to temporarily turn off the power of a certain phase-locked loop when determining that the phase-locked loop is not used.
The control units can be symmetrically distributed in the board or can be independently made into the board according to the system requirement.
The device for local oscillator multiplexing backup between same-frequency wireless communication system boards provided by the invention can multiplex local oscillators between single boards by adopting the multiplexing switches in the single boards controlled by the control unit, has a simple structure and can greatly reduce the cost.
Drawings
Fig. 1 is a schematic block diagram of a device for local oscillator multiplexing backup between boards of a same-frequency wireless communication system according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below.
The device for local oscillator multiplexing backup between same-frequency wireless communication system boards at least comprises two single boards, as shown in fig. 1, the device is composed of a single board 1 and a single board 2, and also comprises a control unit 3, wherein the single board 1 contains a first single-pole double-throw electronic switch 100, a phase-locked loop PLL101, a first n-shaped network 102, a single-pole single-throw electronic switch 103, a 1/2 power distributor 104, a second n-shaped network 105, a first amplifier 106, a third n-shaped network 107, a second single-pole double-throw electronic switch 108, a fourth n-shaped network 109 and a second amplifier 110. Similarly, the structure of the single board 2 is the same as that of the single board 1, and the single board 2 contains a first single-pole double-throw electronic switch 200, a phase-locked loop PLL201, a first n-shaped network 202, a single-pole single-throw electronic switch 203, a 1/2 power divider 204, a second n-shaped network 205, a first amplifier 206, a third n-shaped network 207, a second single-pole double-throw electronic switch 208, a fourth n-shaped network 209 and a second amplifier 210. The single board 1 and the single board 2 are connected by a coaxial cable, and the multiplexing and backup of the local oscillator are realized by switching the electronic switches in the control board through the control unit 3. In specific implementation, the control units may be symmetrically distributed in the board or may be individually made into a board, according to the needs of the system.
Since the circuit topology structures of the single boards in the apparatus of the present invention are completely consistent, taking the single board 1 as an example, the advantages of the circuit topology structure can be described:
the phase locked loop PLL101 is connected directly to the power divider 104 via the first pi-network 102, which is essentially a direct connection 1/2, but in the arrangement of the invention a single pole single throw electronic switch 103 is introduced between the two. Therefore, when the system does not use a phase-locked loop (PLL), the single-pole single-throw electronic switch 103 plays a good isolation role, and isolation is avoided only through a second single-pole double-throw electronic switch 108 at the back, so that 2-stage switch isolation is formed, and high isolation is ensured.
The connection parts of the two ends of the switch are connected by the pi-shaped network or the power divider, so that the standing-wave ratio of the corresponding part can be well improved, and the stability of the whole system and even the whole system is greatly improved.
The introduction of the first single-pole double-throw electronic switch 100 makes the external structural connection simpler, and taking the first single-pole double-throw electronic switch 100 as an example, if the first single-pole double-throw electronic switch is not used, the outside is connected by two coaxial cables; on the other hand, 1-level switch isolation is added for the branches which are not used, and the isolation degree is further ensured.
For the branch circuit, the second pi-shaped network 105, the first amplifier 106 and the third pi-shaped network 107, the pi-shaped network not only improves the standing-wave ratio, but also ensures the adjustment amplitude of the local oscillation level.
In the device for local oscillator multiplexing backup between the same-frequency wireless communication system boards, more than two single boards can be adopted, each single board adopts the internal circuit structure, and the external control unit can realize the connection control of more single boards only by adopting a matrix switch control mode. In addition, since only one local oscillation source of a single board corresponds to one phase-locked loop PLL, only the phase-locked loop PLL is shown in the figure, and the corresponding local oscillation source is not shown.
In this embodiment, when the two single boards both use the phase-locked loop output of the single board 1, the control unit 3 must send a control command to turn on the single-pole single-throw electronic switch 103 in the single board 1, turn on the second single-pole double-throw electronic switch 108 to turn on 1/2 power divider 104, turn on the first single-pole double-throw electronic switch 100 to turn on 1/2 power divider 104, turn on the second pi-shaped network 205 for the first single-pole double-throw electronic switch 200 in the single board 2, turn on the third pi-shaped network 207 for the second single-pole double-throw electronic switch 208, and turn off the single-pole single-throw electronic switch 203.
In this case, the operation path is as follows: the phase-locked loop PLL101 in the board 1 is provided to the inside of the board 1 through the first n-type network 102, the single-pole single-throw electronic switch 103, the power divider 104 1/2, the second single-pole double-throw electronic switch 108, the fourth n-type network 109, and the second amplifier 110. Meanwhile, the other end of the 1/2 power divider 104 outputs, connects the first single-pole double-throw electronic switch 100, and inputs to the single board 2 through the coaxial cable. The branches from the second pi-network 105 to the third pi-network 107 are now unused.
After reaching the single board 2 through the coaxial cable, the first phase-locked loop PLL in the single board 1 passes through the first single-pole double-throw electronic switch 200, the second pi-shaped network 205, the first amplifier 206, the third pi-shaped network 207, the second single-pole double-throw electronic switch 208, the fourth pi-shaped network 209 and the second amplifier 210, and is finally supplied to the inside of the single board 2 for use.
The two single boards may also both adopt the phase-locked loop output of the single board 2, and at this time, since the structures of the single board 1 and the single board 2 are completely symmetrical, the working condition is similar to the condition of the local oscillator of the multiplexing single board 1, and details are not repeated here.
The two single boards can also respectively output by using phase-locked loops in the own board, at this time, the single-pole single-throw electronic switch 103 in the single board 1 is set to be conducted, the second single-pole double-throw electronic switch 108 is connected with the 1/2 power divider 104, so that the single board 1 uses the own phase-locked loop PLL, and the first single-pole double-throw electronic switch 100 is connected with a branch from the second pi-shaped network 105 to the third pi-shaped network 107 at this time. At the same time, the single-pole single-throw electronic switch 203 in the board 2 is set to be on, the second single-pole double-throw electronic switch 208 switches on 1/2 the power divider 204, so that the board 2 uses its own phase-locked loop PLL, and at this time, the first single-pole double-throw electronic switch 200 switches on the branches of the second pi-network 205 to the third pi-network 207. When one of the PLLs is abnormal, the control unit may control the on/off state of the electronic switch, and switch to the PLL multiplexing one of the single boards according to the working condition, thereby implementing the backup of the local oscillator.
According to the technical scheme, the device for local oscillator multiplexing backup between the same-frequency wireless communication system boards has the following beneficial effects:
1. the multiplexing of local oscillators is realized only through one cable among the single boards, and the structure is very simple.
2. In terms of a link structure, the local vibration source is isolated by at least 2-stage switches before being used, so that the isolation degree is high, the index of a phase-locked loop (PLL) is guaranteed, and the phase-locked loop is very reliable.
3. When the system does not need local oscillation source multiplexing, the single board can use the local oscillation source inside the single board, and simultaneously, because the local oscillation source multiplexing is realized, when one local oscillation source goes wrong, the other local oscillation source can be jointly adopted, thereby realizing a very simple and economic local oscillation backup scheme.
In conclusion, the technical scheme of the invention realizes a simple, economic and reliable inter-board local oscillator multiplexing backup device, and well meets the requirement of local oscillator sources in a same-frequency communication system with higher signal coherence requirement of each channel.
Meanwhile, in order to achieve better effects in the implementation of the above technical solution of the present invention, the following points need to be paid attention to in the specific implementation:
1. the isolation degree of a single electronic switch is required to be at least more than 25dB so as to ensure good isolation of the whole local vibration source path.
2. The higher the consistency of the performance of the electronic switch is, the better the consistency is, namely, the same type of switch is preferably used to ensure the consistency of the output level of the local vibration source.
The device for local oscillator multiplexing backup between the same-frequency wireless communication system boards can add power management to the amplifier when used in a Time Division Duplex (TDD) system, so that the amplifier of a branch circuit which is not used can be closed, and the amplifier of the branch circuit has no influence on other branch circuits completely. In systems where the response time is not critical, power control may also be applied to the PLL's, so that when a PLL is determined to be unused, the PLL's power may be temporarily shut down, thereby blocking the PLL's effect on other circuits.
In summary, the present invention realizes an apparatus for local oscillator multiplexing backup between boards in a same-frequency wireless communication system, and the above description of the specific embodiment is more detailed and should not be considered as a limitation to the scope of the present invention, which shall be subject to the appended claims.
Claims (6)
1. A local oscillation multiplexing backup device between same frequency wireless communication system boards, a single board of the system is provided with a local oscillation source and a corresponding phase-locked loop thereof, the local oscillation source and the corresponding phase-locked loop are connected with an 1/2 power divider through a first n-shaped network, the 1/2 power divider is connected with a fourth n-shaped network, and the fourth n-shaped network is provided for the single board to use after passing through a second amplifier; it is characterized in that the preparation method is characterized in that,
the system has at least two single boards, and each single board is provided with
The single-pole end of the first single-pole double-throw electronic switch is externally connected with an external port, and the double-throw end of the first single-pole double-throw electronic switch is respectively connected with the 1/2 power divider and a branch formed by serially connecting a second n-shaped network, a first amplifier and a third n-shaped network in sequence;
a single-pole single-throw electronic switch is arranged between the first n-shaped network and the 1/2 power divider;
a second single-pole double-throw electronic switch is arranged among the third n-shaped network, the 1/2 power divider and the fourth n-shaped network, and the connecting end of the fourth n-shaped network is taken as the single-pole end of the fourth n-shaped network; and is
The electronic switches are controlled to be opened and closed by a control unit, and the local oscillation source and the phase-locked loop in the single board are subjected to multiplexing backup; the single boards are connected with the external ports through single coaxial cables.
2. The apparatus of claim 1, wherein the number of boards is two, and the isolation of each electronic switch is greater than 25 dB.
3. The device of claim 2, wherein the electronic switches are of the same type at the same location within the respective board.
4. The apparatus of claim 3, wherein the apparatus provides power management to the amplifiers in a time division duplex system to turn off unused branch amplifiers.
5. The apparatus of claim 4, wherein the apparatus further provides power management for each phase-locked loop in a system that does not require significant latency to temporarily power down a phase-locked loop when it is determined that the phase-locked loop is not in use.
6. The device according to any one of claims 1 to 5, wherein the control units are distributed symmetrically in the board or made into the board separately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100330337A CN100375403C (en) | 2005-01-26 | 2005-01-26 | Apparatus for common-frequency radio communication system interplate local oscillator multi-backup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100330337A CN100375403C (en) | 2005-01-26 | 2005-01-26 | Apparatus for common-frequency radio communication system interplate local oscillator multi-backup |
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| Publication Number | Publication Date |
|---|---|
| CN1812281A CN1812281A (en) | 2006-08-02 |
| CN100375403C true CN100375403C (en) | 2008-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100330337A Expired - Fee Related CN100375403C (en) | 2005-01-26 | 2005-01-26 | Apparatus for common-frequency radio communication system interplate local oscillator multi-backup |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988851A (en) * | 2018-06-11 | 2018-12-11 | 西安空间无线电技术研究所 | A kind of cross interconnected function crossover rate synthesizer of multifrequency point at equal intervals |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06237169A (en) * | 1993-02-09 | 1994-08-23 | Matsushita Electric Ind Co Ltd | Pll frequency synthesizer incorporating switch |
| JPH09116433A (en) * | 1995-10-13 | 1997-05-02 | Nippon Soken Inc | Pll frequency synthesizer |
| CN1523907A (en) * | 2003-02-20 | 2004-08-25 | 华为技术有限公司 | A method for backup of power amplifier and equipment thereof |
-
2005
- 2005-01-26 CN CNB2005100330337A patent/CN100375403C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06237169A (en) * | 1993-02-09 | 1994-08-23 | Matsushita Electric Ind Co Ltd | Pll frequency synthesizer incorporating switch |
| JPH09116433A (en) * | 1995-10-13 | 1997-05-02 | Nippon Soken Inc | Pll frequency synthesizer |
| CN1523907A (en) * | 2003-02-20 | 2004-08-25 | 华为技术有限公司 | A method for backup of power amplifier and equipment thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988851A (en) * | 2018-06-11 | 2018-12-11 | 西安空间无线电技术研究所 | A kind of cross interconnected function crossover rate synthesizer of multifrequency point at equal intervals |
| CN108988851B (en) * | 2018-06-11 | 2023-02-03 | 西安空间无线电技术研究所 | Equal-interval multi-frequency-point cross-connection power division frequency synthesis device |
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| Publication number | Publication date |
|---|---|
| CN1812281A (en) | 2006-08-02 |
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