CN104639162A - Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof - Google Patents
Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof Download PDFInfo
- Publication number
- CN104639162A CN104639162A CN201310559655.8A CN201310559655A CN104639162A CN 104639162 A CN104639162 A CN 104639162A CN 201310559655 A CN201310559655 A CN 201310559655A CN 104639162 A CN104639162 A CN 104639162A
- Authority
- CN
- China
- Prior art keywords
- locked loop
- phase
- reference signal
- level phase
- remote unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention provides a parallel-connected multi-channel RRF (radio-frequency remote unit) device. The parallel-connected multi-channel RRF (radio-frequency remote unit) device comprises an FPGA (field programmable gate array) transceiver, a first-level phase-locked loop, a second-level phase-locked loop, a distributor and a frequency synthesizer. The FPGA transceiver is used for providing reference signals required by the first-level phase-locked loop. The first-level phase-locked loop is used for providing reference signals required by the second-level phase-locked loop. The second-level phase-locked loop and the distributor are used for providing reference signals required by the frequency synthesizer. The parallel-connected multi-channel RRF device is characterized in that the second-level phase-locked loop is further provided with a two-way port transmitting reference signals to a second-level phase-locked loop of the other parallel-connected multi-channel RRF device. The invention further provides an local oscillator signal generating method of the parallel-connected multi-channel RRF (radio-frequency remote unit) device.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of parallel channel RF remote unit device and method for generating local oscillation signal thereof.
Background technology
The RRU(RF remote unit of wireless communication system) circuit generally comprises digital circuits section and Frequency Synthesizer, usual elder generation by digital circuits section for Frequency Synthesizer provides a reference signal, Frequency Synthesizer is exactly a phase-locked loop in essence, again by Frequency Synthesizer by VCO(voltage controlled oscillator) frequency and the Frequency Locking of reference signal, obtain the signal that a frequency accuracy is the same with the frequency accuracy of reference signal, the local oscillation signal of this signal as RRU circuit after amplifying is used.Wherein, digital circuits section provides the process of reference signal to be generally for Frequency Synthesizer: (1) FPGA transceiver recovers a reference clock from optical fiber.(2) recovered clock is supplied to first order phase-locked loop as with reference to signal, after first order phase-locked loop Key dithering, produce a low-jitter clock.(3) low-jitter clock is as the reference signal of second level phase-locked loop, carries out parallel compensate by second level phase-locked loop and distributor, produces all frequencies that digital circuits section needs, comprising giving Frequency Synthesizer as the frequency with reference to signal.
For the communication system using multiple antennas, normally RRU circuit is divided into two multichannel RRU devices (such as the RRU circuit of 8 passages being divided into two 4 passage RRU devices) in parallel, then these two multichannel RRU devices are carried out parallel connection, this just needs the local oscillation signal providing same frequency, same phase (or stationary phase) to two multichannel RRU devices.If two multichannel RRU devices use respectively the clock that respectively recovers on optical fiber by after respective first order phase-locked loop and second level phase-locked loop for respective Frequency Synthesizer provides reference signal, shake then due to the clock recovered from optical fiber is very large, even if operate through the debounce of first order phase-locked loop, the phase noise of near-end is still very large, the local oscillation signal finally exported by two multichannel RRU devices Frequency Synthesizer separately has phase jitter to a certain degree, and this shake preferably also can at about 10 °.For the RRU circuit composed in parallel by two multichannel RRU devices, this shake is fatal, can have a strong impact on the signal syntheses of multiple antennas.Therefore the common practices of prior art is: setting one of them multichannel RRU device is main device, another one is from device, only use the Frequency Synthesizer on main device to provide local oscillation signal for two multichannel RRU devices, namely by power splitter the radio-frequency (RF) local oscillator signal of main device given and use from device.Connected by coaxial cable between two multichannel RRU devices, what transmit in coaxial cable is radio-frequency (RF) local oscillator signal.
The method that above-mentioned use coaxial cable transmits local oscillation signal between principal and subordinate's multichannel RRU device exists a lot of not enough.First, because the local oscillator of transmission is radiofrequency signal, the mode of the use of the selection of connector, pcb board material, wiring all needs to design according to RF-wise accordingly, and technical difficulty is high, cost is also higher.Secondly, two multichannel RRU devices cannot be accomplished identical, must be that a multichannel RRU device exports local oscillator, another one multichannel RRU device input local oscillator, so these two multichannel RRU devices need to treat as two kinds of products, production and product maintenance can increase management and control difficulty.Again, these two multichannel RRU devices are because profile is similar, but function is different, easily produce mistake, cause on-site maintenance cost to increase when installing at the scene.
Summary of the invention
In order to overcome the defect of prior art, the present invention proposes a kind of new parallel channel RRU device, comprise FPGA transceiver, first order phase-locked loop, second level phase-locked loop, distributor and Frequency Synthesizer, FPGA transceiver is for providing the reference signal needed for first order phase-locked loop, first order phase-locked loop is for providing the reference signal needed for the phase-locked loop of the second level, second level phase-locked loop and distributor are for providing the reference signal needed for Frequency Synthesizer, it is characterized in that: second level phase-locked loop also has one for transmitting the bidirectional port of reference signal with the second level phase-locked loop of other parallel channel RRU device.
Preferably, above-mentioned bidirectional port is bidirectional clock buffer.
Parallel channel RF remote unit device of the present invention can be any number of active lanes, such as, can be the RRU device of 4 passages, also can be the RRU device of 6 passages.
The invention allows for a kind of method for generating local oscillation signal for above-mentioned parallel channel RRU device, the method does not need just can reach by interconnected radiofrequency signal the object making the local oscillation signal of two multichannel RRU devices in parallel with frequency, homophase (or stationary phase).The method comprises the following steps:
A, setting a parallel channel RF remote unit is main device, another parallel channel RF remote unit is from device, the bidirectional port of main device is configured to output mode, be configured to input pattern from the bidirectional port of device, connected by cable between the bidirectional port of principal and subordinate's two devices;
B, this reference signal is also exported to from device from bidirectional port, from the reference signal that the second level phase-locked loop of device directly adopts bidirectional port to input by the reference signal that the second level phase-locked loop of main device adopts the first order phase-locked loop of self to provide;
C, master and slave devices produces respectively by respective second level phase-locked loop and distributor the reference signal being supplied to respective Frequency Synthesizer;
D, the Frequency Synthesizer of master and slave devices exports respective local oscillation signal.
Preferably, in step a, the mode of operation of software control bidirectional port can be passed through, when software judges from then bidirectional port being switched to output mode as during main device, for then switching to input pattern from during device.
Compared with prior art, the invention has the advantages that: 1, cheap: not need to reach common local oscillator by interconnected radiofrequency signal, just can make the same frequency of the local oscillator of two multichannel RRU devices, homophase (or stationary phase) by means of only the interconnected of low-speed clock signal; 2, convenient: to available circuit flexible Application, existing hardware board and interface do not need to change completely; 3, intelligence: after normal work, just can distinguish principal and subordinate as long as automatically identified by software, enormously simplify the management of product and equipment is installed.
Accompanying drawing explanation
Fig. 1 is the hardware block diagram of 4 passage RRU devices of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The present embodiment composes in parallel the situation of RRU circuit for two 4 passage RRU devices, illustrates 4 passage RRU devices how to generate local oscillation signal.Two 4 passage RRU devices of the present embodiment are designated as RRU A and RRU B respectively, and two devices are identical on hardware configuration, as shown in Figure 1.Each device comprises digital circuits section and Frequency Synthesizer, wherein digital circuits section comprises FPGA transceiver, first order phase-locked loop, second level phase-locked loop and distributor, and second level phase-locked loop comprises one for transmitting the bidirectional port of reference signal with the second level phase-locked loop of other device.
What in the present embodiment, the bidirectional port of the second level phase-locked loop of 4 passage RRU devices adopted is a bidirectional clock buffer, is connected between the bidirectional clock buffer of RRU A and RRU B by cable.Time initialized, be input pattern, just clock buffer switched to output mode when software judges that oneself is main device by software control two clock buffers, another one 4 passage RRU still keeps input pattern.So just can accomplish that two 4 passage RRU devices are just the same on hardware, carry out the input and output of intelligent control reference signal by means of only software.
The step that two 4 passage RRU devices of the present embodiment produce local oscillation signal is as follows:
(1), after RRU A electrifying startup, judging the principal and subordinate's identity of oneself by resolving fiber frame, when A judges that oneself is main device, exporting a reference clock by software merit rating oneself from the first order phase-locked loop of digital circuits section.
(2) after RRU B electrifying startup, the principal and subordinate's identity of oneself is judged by resolving fiber frame, when B judges oneself to be from device, by the first order phase-locked loop not output clock of software merit rating oneself, control second level phase-locked loop from bidirectional port input reference clock simultaneously.
(4) second level phase-locked loop of the digital circuits section of RRU A and RRU B exports a clock to Frequency Synthesizer as reference signal simultaneously.
(5) Frequency Synthesizer of RRU A and RRU B exports local oscillation signal according to reference signal.
Emulation experiment is carried out on the basis that have employed above-described embodiment method, allow two 4 passage RRU devices send data from 8 antennas by software simultaneously, and data are connected to image data on frequency spectrograph by mixer, to the data analysis collected, result is that the relative phase shake of the local oscillation signal of two RRU devices is less than 1 degree.This simulation result demonstrates as drawn a conclusion further: two 4 passage RRU devices only need the second level phase-locked loop of the numerical portion of interconnected two RRU devices to use reference signal when composition 8 passage RRU circuit, just can ensure that the local oscillation signal that two Frequency Synthesizers produce is same frequency, homophase (or stationary phase).
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a parallel channel RF remote unit device, comprise FPGA transceiver, first order phase-locked loop, second level phase-locked loop, distributor and Frequency Synthesizer, FPGA transceiver is for providing the reference signal needed for first order phase-locked loop, first order phase-locked loop is for providing the reference signal needed for the phase-locked loop of the second level, second level phase-locked loop and distributor, for providing the reference signal needed for Frequency Synthesizer, is characterized in that: second level phase-locked loop also has one for transmitting the bidirectional port of reference signal with the second level phase-locked loop of other parallel channel RF remote unit device.
2. device according to claim 1, is characterized in that: described bidirectional port is bidirectional clock buffer.
3. device according to claim 1 or 2, is characterized in that: the channel number of described parallel channel RF remote unit device is 4.
4. a method for generating local oscillation signal for device described in claim 1, is characterized in that, said method comprising the steps of:
A, setting a parallel channel RF remote unit is main device, another parallel channel RF remote unit is from device, the bidirectional port of main device is configured to output mode, be configured to input pattern from the bidirectional port of device, connected by cable between the bidirectional port of principal and subordinate's two devices;
B, this reference signal is also exported to from device from bidirectional port, from the reference signal that the second level phase-locked loop of device directly adopts bidirectional port to input by the reference signal that the second level phase-locked loop of main device adopts the first order phase-locked loop of self to provide;
C, master and slave devices produces respectively by respective second level phase-locked loop and distributor the reference signal being supplied to respective Frequency Synthesizer;
D, the Frequency Synthesizer of master and slave devices exports respective local oscillation signal.
5. method according to claim 4, is characterized in that step a, the mode of operation by software control bidirectional port: when software judges from then bidirectional port being switched to output mode as during main device, for then switching to input pattern from during device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310559655.8A CN104639162A (en) | 2013-11-12 | 2013-11-12 | Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310559655.8A CN104639162A (en) | 2013-11-12 | 2013-11-12 | Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104639162A true CN104639162A (en) | 2015-05-20 |
Family
ID=53217546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310559655.8A Pending CN104639162A (en) | 2013-11-12 | 2013-11-12 | Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104639162A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105187054A (en) * | 2015-09-15 | 2015-12-23 | 合肥格易集成电路有限公司 | Phase-locked loop system |
| CN106330346A (en) * | 2015-06-30 | 2017-01-11 | 中兴通讯股份有限公司 | Remote radio unit and test method thereof |
| CN108039883A (en) * | 2017-11-21 | 2018-05-15 | 南京凌鸥创芯电子有限公司 | A kind of detection method and equipment of phaselocked loop output stable clock signal degree |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5448763A (en) * | 1993-11-09 | 1995-09-05 | Motorola | Apparatus and method for operating a phase locked loop frequency synthesizer responsive to radio frequency channel spacing |
| CN101436896A (en) * | 2007-11-13 | 2009-05-20 | 中兴通讯股份有限公司 | IQ data transmission method of radio frequency zooming unit |
| CN101841935A (en) * | 2010-05-12 | 2010-09-22 | 新邮通信设备有限公司 | Single-antenna remote radio unit |
| CN203537371U (en) * | 2013-11-12 | 2014-04-09 | 北京信威通信技术股份有限公司 | Parallel-connection multichannel radio frequency far-end unit device |
-
2013
- 2013-11-12 CN CN201310559655.8A patent/CN104639162A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5448763A (en) * | 1993-11-09 | 1995-09-05 | Motorola | Apparatus and method for operating a phase locked loop frequency synthesizer responsive to radio frequency channel spacing |
| CN101436896A (en) * | 2007-11-13 | 2009-05-20 | 中兴通讯股份有限公司 | IQ data transmission method of radio frequency zooming unit |
| CN101841935A (en) * | 2010-05-12 | 2010-09-22 | 新邮通信设备有限公司 | Single-antenna remote radio unit |
| CN203537371U (en) * | 2013-11-12 | 2014-04-09 | 北京信威通信技术股份有限公司 | Parallel-connection multichannel radio frequency far-end unit device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330346A (en) * | 2015-06-30 | 2017-01-11 | 中兴通讯股份有限公司 | Remote radio unit and test method thereof |
| CN105187054A (en) * | 2015-09-15 | 2015-12-23 | 合肥格易集成电路有限公司 | Phase-locked loop system |
| CN108039883A (en) * | 2017-11-21 | 2018-05-15 | 南京凌鸥创芯电子有限公司 | A kind of detection method and equipment of phaselocked loop output stable clock signal degree |
| CN108039883B (en) * | 2017-11-21 | 2021-01-29 | 南京凌鸥创芯电子有限公司 | Method and device for detecting stability of output clock signal of phase-locked loop |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108139463B (en) | Integrated high-frequency circuit, radar sensor and method for operating | |
| CN104239258A (en) | Sensor network using pulse width modulated signals | |
| CN105119671A (en) | Multichannel scattering parameter testing circuit and method for complex modulation and phase coherence system | |
| US9521636B2 (en) | Synchronization circuitry, common public radio interface enable device, and a method of synchronizing a synchronized clock signal of a second transceiver to a clock of a first transceiver | |
| EP2696514A1 (en) | TDD repeater for a wireless network | |
| CN209765038U (en) | Radar signal and target simulator | |
| CN105510888A (en) | Radar signal simulation method based on digital synthesis, and simulator | |
| CN102386946A (en) | Data transmission rapid frequency hopping radio station | |
| CN102611491A (en) | Base station clock device, base station system and clock synchronization method | |
| CN104639162A (en) | Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof | |
| CN105005545A (en) | Line card serial port switching device and line card serial port switching method | |
| KR102656996B1 (en) | Multi-channel phase synchronization device, method and base station in base station | |
| CN104539377A (en) | Calibrating device, system and method | |
| CN108134645A (en) | Radar signal synchronization system | |
| CN110830057A (en) | Multichannel universal wireless signal transmitting equipment based on software radio architecture | |
| CN103245958B (en) | Marking-checking network distributing device suitable for satellite navigation digital multi-beam array | |
| CN203537371U (en) | Parallel-connection multichannel radio frequency far-end unit device | |
| CN104683057A (en) | Method and system of time synchronization among multiple instruments | |
| CN104460826A (en) | FPGA (field programmable gate array)-based MIPI (mobile industry processor interface) module DSI clock reconfiguration realizing method | |
| CN112311492A (en) | High-precision clock synchronization method based on FPGA | |
| CN102355259A (en) | Integrated circuits with frequency generating circuits | |
| CN105681151A (en) | Method and system for implementing QinQ, OTL device and electronic device | |
| CN112350718B (en) | Clock source circuit, chassis and multi-chassis cascading system | |
| CN114282677A (en) | Main control device, slave control device and quantum computing system | |
| CN105356896A (en) | Multi-frequency switching system and method for miniature Ka double-frequency transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150520 |
|
| WD01 | Invention patent application deemed withdrawn after publication |