CN102164109B - Downlink frequency offset compensation method and repeater used for performing downlink frequency offset compensation - Google Patents
Downlink frequency offset compensation method and repeater used for performing downlink frequency offset compensation Download PDFInfo
- Publication number
- CN102164109B CN102164109B CN201010112757.1A CN201010112757A CN102164109B CN 102164109 B CN102164109 B CN 102164109B CN 201010112757 A CN201010112757 A CN 201010112757A CN 102164109 B CN102164109 B CN 102164109B
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- repeater
- antenna
- frequency offset
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a downlink frequency offset compensation method which comprises: in a to-be-compensated downlink time slot, a base station inserts a specific signal on a pre-appointed assistant carrier of each RRU (radio remote unit); a repeater receives a signal, and compares the frequency of the received signal with the frequency of the specific signal, thereby acquiring a frequency error between the two frequencies; and the repeater compensates the frequency error to an emission channel. The invention also discloses a repeater used for performing downlink frequency offset compensation. By using the method and repeater provided by the invention, the downlink frequency offset compensation can be performed on a common signal channel and the channels of other BBU (base band unit) which are not compensated with frequency.
Description
Technical field
The present invention relates to the compensate of frequency deviation technology in high ferro application, particularly downlink frequency offset compensation method and for carrying out the repeater of downlink frequency offset compensation.
Background technology
In high-speed railway application, UE can relative working frequency points produce frequency deviation when high-speed mobile.In existing network processing techniques, for upward signal, can carry out correcting frequency offset by the powerful Base-Band Processing ability of baseband processing unit (BBU); For downstream signal, if BBU does not do frequency compensation, cannot correcting frequency offset by the ability of UE self, the subject matter causing is thus, and: UE cannot persistent district, and Block Error Rate is increased, thereby causes service feature to decline.
For solving the problems of the technologies described above, the network processing techniques that industry is taked is at present: at UE, set up after dedicated link, BBU will implement a compensate of frequency deviation algorithm, the frequency deviation that under high ferro application scenarios, UE produces at dedicated link is compensated, thereby has solved the performance issue of dedicated service under high ferro application scenarios.
Yet the compensate of frequency deviation that prior art is not carried out frequency compensated channel to common signal channel and other BBU proposes any solution.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of downlink frequency offset compensation method and a kind of for carrying out the repeater of downlink frequency offset compensation, so that common signal channel and other BBU are carried out to frequency compensated channel, does not carry out downlink frequency offset compensation.
For achieving the above object, the invention provides a kind of downlink frequency offset compensation method, comprising:
In the descending time slot of needs compensation, signal specific is inserted in base station on the preassigned auxiliary carrier wave of each remote processor unit R RU;
Repeater receives signal, and the frequency of the frequency of the signal receiving and described signal specific is compared, and draws frequency error between the two;
Repeater compensates to described frequency error in transmission channel.
The described frequency by the frequency of the signal receiving and described signal specific compare for: from the signal receiving, find out the signal of amplitude maximum, the frequency of the frequency of the signal of described amplitude maximum and described signal specific compared.
The described descending time slot that need to compensate is that time slot 0 or BBU do not carry out frequency compensated descending time slot.
The method may further include:
The antenna of two back-to-back placements is set in advance in repeater, and makes the front and back isolation of two antennas be greater than 20dB;
Repeater is used respectively two passages to carry out compensate of frequency deviation to the received strong footpath of each antenna, and sends after compensate of frequency deviation signal amplification afterwards carrying out.
It is a kind of for carrying out the repeater of downlink frequency offset compensation that the present invention also provides, and comprising:
Frequency offset calculation module, for the frequency of the frequency of the signal receiving and described signal specific is compared, draws frequency error between the two;
Direct Digital Synthesizer, for compensating to described frequency error this center of percussion of repeater;
Frequency converter, for compensating to described frequency error the transmission channel of repeater by local oscillator.
Described frequency offset calculation module, also, for find out the signal of amplitude maximum from the signal receiving, compares the frequency of the frequency of the signal of described amplitude maximum and described signal specific, draws frequency error between the two.
In described repeater, further comprise the antenna of two back-to-back placements, and the front and back isolation of described two antennas is greater than 20dB;
Described frequency offset calculation module, is used respectively two passages to carry out frequency error computing to the received strong footpath of each antenna;
Described Direct Digital Synthesizer, for compensating to respectively this center of percussion of repeater according to the result of described frequency error computing by frequency error;
Described frequency converter, for compensating to frequency error the transmission channel of repeater by local oscillator.
As seen from the above technical solution, downlink frequency offset compensation method provided by the invention and repeater can not carried out frequency compensated channel to common signal channel and other BBU and carried out downlink frequency offset compensation.And technical solution of the present invention has the following advantages: repeater does not affect the switching of UE between each path, cell; Modification to base station side is simple, only need in specific carriers, send signal specific; What Frequency Estimation use was carried out in repeater is signal specific, therefore without solution, is transferred to base band, makes technical scheme simple, and repeater hardware is realized simple.In addition, used the isolation of antenna to realize the selection in strong footpath, without carrying out other processing.In addition, repeater can obtain by the signal specific receiving time slot proportion information, so that the time slot proportion of repeater and base station automatic synchronization easily, without artificial setting.
Accompanying drawing explanation
Fig. 1 is that the present invention inserts the TS0 frequency domain schematic diagram after signal specific in auxiliary carrier wave TS0 time slot;
Fig. 2 inserts respectively the schematic diagram of signal specific on the different RRUs passage of the present invention in auxiliary carrier wave TS0 time slot;
Fig. 3 is the block diagram of realizing of the present invention one better repeater;
Fig. 4 is the principle schematic of double antenna of the present invention, binary channels frequency bias compensation method.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
In high ferro application, repeater is used for receiving downstream signal from remote processor unit (RRU), and by transmission channel, is transmitted to UE after downstream signal is amplified.
Main thought of the present invention is: in the descending time slot of needs compensation, signal specific is inserted in base station on the auxiliary carrier wave of certain appointment of each RRU, repeater receives this signal, and the frequency of the signal receiving is compared with the frequency of this signal specific, draw frequency error between the two, then this frequency error is compensated in transmission channel, thereby realize the compensate of frequency deviation to this descending time slot.
The frequency compensation of TS0 time slot of take is example, not use of TS0 time slot due to auxiliary carrier wave in prior art, therefore, can be in TS0 time slot according to the inventive method, on the auxiliary carrier wave of certain appointment of launching at each RRU, insert signal specific, repeater receives this signal, and the frequency of the signal receiving is compared with the frequency of this signal specific, draw frequency error, then this frequency error is compensated in the transmission channel of TS0 time slot.
With 3C high ferro, be covered as example, as inserted signal specific on the TS0 of auxiliary carrier wave, TS0 frequency domain schematic diagram now as shown in Figure 1.In Fig. 1:
F1 is the centre frequency of main carrier, the centre frequency that F2 and F3 are auxiliary carrier wave.In figure, only the residing region of F1 illustrates with shade, represents to only have main carrier to have TS0, and other carrier waves do not have TS0.
F4, F5, F6 are the signal specific that 3 RRU passages insert respectively in auxiliary carrier wave TS0 time slot.For same RRU passage, in the TS0 of auxiliary carrier wave F3 time slot, only insert the signal specific (that is: in F4, F5, F6) of 1 frequency; 3 RRU passages (passage 1, passage 2 and passage 3 as shown in Figure 2) for next-door neighbour insert respectively successively F4, F5, F6, as shown in Figure 2 in the TS0 of auxiliary carrier wave F3 time slot.That is: passage 1 inserts F4 at F3, and passage 2 inserts F5 at F3, and passage 3 inserts F6 at F3; More multichannel processing is by the situation circular treatment of 3 passages.
Above-mentioned example insert signal specific the utilization of resources TS0 of auxiliary carrier wave, if the TS0 of auxiliary carrier wave also will be used in the future, can on other no carrier resources, insert signal specific to realize compensate of frequency deviation arbitrarily.In this signal specific, can comprise uplink and downlink timeslot proportioning information.
The present invention one better repeater realize block diagram as shown in Figure 3.The handling process of repeater shown in Fig. 3 from base station receives downstream signal is as follows:
The 1st step: repeater receives after the downstream signal of base station by low noise amplifier (LNA:Low Noise Amplifier), by upconverter MIXER1, undertaken that down-converted (local oscillator is LO1), Surface Acoustic Wave Filter (IF SAWF) are carried out filtering, analog to digital converter (ADC) is sampled successively and after digital filtering processes, find each signal specific of inserting in F3 carrier wave in TS0 time slot.
The 2nd step: find out signal specific and the frequency thereof of amplitude maximum from above-mentioned each signal specific, this frequency, because the original frequency of the impact of Doppler effect and the signal specific of base station transmitting has had skew, is designated as Δ f by this frequency deviation.
The 3rd step: the frequency offset calculation module in repeater is obtained Δ f on numeric field.
The 4th step: this Δ f is compensated into local oscillation signal LO2 by Direct Digital Synthesizer (DDS).
The 5th step: the local oscillation signal LO2 that comprises frequency compensation information enters transmission channel by compensate of frequency deviation information compensation by upconverter MIXER2 in TS0 time slot.
The 6th step: the signal after compensation is sent by power amplifier (PA).
For other descending time slots except TS0, if BBU does not carry out frequency compensation, repeater can compensate resulting frequency error into transmission channel in other time slots; If BBU compensates other time slots, repeater is without these time slots of compensation.
The application scenarios that only has a strong footpath to base station and do not switch for repeater, can solve the problem of downlink frequency offset well by technique scheme provided by the invention.But, if between two strong footpaths of repeater in same community, or between two strong footpaths of repeater in different districts, UE will receive two essentially identical signals of intensity, in any case carrying out frequency compensation, these two signals must have a signal to there will be the frequency deviation of 2 Δ f, now, will have cannot persistent district and the problem that increases of Block Error Rate in the reception of UE.
For solving this two problems, the present invention has introduced double antenna, binary channels solution, and the principle schematic of this scheme as shown in Figure 4.
Two back-to-back placements of donor antenna of repeater, the front and back isolation of two antennas can accomplish to be greater than 20dB through emulation and actual measurement, so just can guarantee each antenna reception to signal only have a strong footpath, repeater is used two passages to rectify a deviation separately to each strong footpath, to the path1 compensation+Δ f shown in figure, to the path2 compensation-Δ f shown in figure, and the signal after correction is all amplified to interior.
How UE switches between each Jing, community, and repeater does not participate in.
As seen from the above-described embodiment, downlink frequency offset compensation method provided by the invention and repeater can not carried out frequency compensated channel to common signal channel and other BBU and carried out downlink frequency offset compensation.And technical solution of the present invention has the following advantages: repeater does not affect the switching of UE between each path, cell; Modification to base station side is simple, only need in specific carriers, send signal specific; What Frequency Estimation use was carried out in repeater is signal specific, therefore without solution, is transferred to base band, makes technical scheme simple, and repeater hardware is realized simple.In addition, used the isolation of antenna to realize the selection in strong footpath, without carrying out other processing.In addition, repeater can obtain by the signal specific receiving time slot proportion information, so that the time slot proportion of repeater and base station automatic synchronization easily, without artificial setting.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (2)
1. a downlink frequency offset compensation method, is characterized in that, is applicable to high ferro application scenarios, comprising:
The antenna of two back-to-back placements is set in advance in repeater, and makes the front and back isolation of two antennas be greater than 20dB;
At time slot 0 or baseband processing unit (BBU), do not carry out in frequency compensated descending time slot, signal specific is inserted in base station on the preassigned idle carrier wave of each remote processor unit (RRU);
Repeater receives signal by the antenna of described two back-to-back settings, and the signal of therefrom finding out respectively amplitude maximum compares with the frequency of described signal specific respectively as ，Jiang Qiang footpath, strong footpath separately, draws frequency error between the two;
Repeater is used two passages respectively compensate of frequency deviation to be carried out in the received strong footpath of each antenna, and sends after compensate of frequency deviation signal amplification afterwards carrying out.
2. for carrying out a repeater for downlink frequency offset compensation, it is characterized in that, be applicable to high ferro application scenarios, comprising:
The antenna of two back-to-back placements, and the front and back isolation of described two antennas is greater than 20dB;
The antenna of described two back-to-back placements, be used for receiving signal, described signal is that time slot 0 or the baseband processing unit (BBU) at the preassigned idle carrier wave of each remote processor unit (RRU) do not carry out the signal specific that frequency compensated descending time slot inserts from base station;
Frequency offset calculation module, for from the antenna reception of described two back-to-back placements to the signal signal of finding out respectively amplitude maximum as strong footpath separately, and use respectively two passages that the received strong footpath of each antenna and the frequency of signal specific are compared, draw frequency error between the two;
Direct Digital Synthesizer, for compensating to respectively this center of percussion of repeater by described frequency error;
Frequency converter, for compensating to described frequency error respectively by local oscillator the transmission channel of repeater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010112757.1A CN102164109B (en) | 2010-02-22 | 2010-02-22 | Downlink frequency offset compensation method and repeater used for performing downlink frequency offset compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010112757.1A CN102164109B (en) | 2010-02-22 | 2010-02-22 | Downlink frequency offset compensation method and repeater used for performing downlink frequency offset compensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102164109A CN102164109A (en) | 2011-08-24 |
| CN102164109B true CN102164109B (en) | 2014-02-26 |
Family
ID=44465086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010112757.1A Expired - Fee Related CN102164109B (en) | 2010-02-22 | 2010-02-22 | Downlink frequency offset compensation method and repeater used for performing downlink frequency offset compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102164109B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103179069B (en) * | 2011-12-26 | 2016-01-13 | 中国电信股份有限公司 | Method for sending information and system, message receiving method and system thereof |
| CN105338612B (en) * | 2014-08-08 | 2019-12-27 | 中国移动通信集团有限公司 | Synchronization and control method and device of wireless repeater and wireless repeater |
| CN107294898B (en) * | 2016-04-11 | 2019-12-06 | 大唐移动通信设备有限公司 | Method and device for pre-correcting downlink frequency offset |
| CN108400835B (en) * | 2017-02-07 | 2020-05-26 | 大唐移动通信设备有限公司 | Pre-correction method and device for downlink signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1533039A (en) * | 2003-03-13 | 2004-09-29 | ���ǵ�����ʽ���� | Device and method for compensating frequency deviation in mobile communication system |
| CN201122970Y (en) * | 2007-12-06 | 2008-09-24 | 奥维通信股份有限公司 | Double-frequency micro-power repeater |
| CN101359928A (en) * | 2007-08-02 | 2009-02-04 | 鼎桥通信技术有限公司 | Frequency deviation estimation method |
-
2010
- 2010-02-22 CN CN201010112757.1A patent/CN102164109B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1533039A (en) * | 2003-03-13 | 2004-09-29 | ���ǵ�����ʽ���� | Device and method for compensating frequency deviation in mobile communication system |
| CN101359928A (en) * | 2007-08-02 | 2009-02-04 | 鼎桥通信技术有限公司 | Frequency deviation estimation method |
| CN201122970Y (en) * | 2007-12-06 | 2008-09-24 | 奥维通信股份有限公司 | Double-frequency micro-power repeater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102164109A (en) | 2011-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10484078B2 (en) | Reconfigurable and modular active repeater device | |
| US9065519B2 (en) | Method and system of interference cancelation in collocated transceivers configurations | |
| US9748906B2 (en) | Distributed antenna system architectures | |
| Askar et al. | Active self-interference cancellation mechanism for full-duplex wireless transceivers | |
| WO2015127816A1 (en) | Method and relay device for reducing adjacent frequency interference | |
| CN111865353A (en) | RF front end with reduced receiver desensitization | |
| EP3731434A1 (en) | Donor unit, remote unit, and mobile communication base station system having same | |
| EP2775681B1 (en) | Method, device and base station system for transceiving and processing radio frequency signal | |
| US20180310226A1 (en) | Main unit and distributed antenna system including the same | |
| CN102164109B (en) | Downlink frequency offset compensation method and repeater used for performing downlink frequency offset compensation | |
| JP2014099679A (en) | Distributed radio communication base station system, signal processing device, radio device, and distributed radio communication base station system operation method | |
| KR20200005473A (en) | Repeater and operating method of the repeater | |
| US20140198831A1 (en) | Radio Frequency Signal Transceiving and Processing Method, Device, and Base Station System | |
| WO2022011066A1 (en) | 5g/6g oran star array with simultaneous transmit and receive | |
| JP2015220524A (en) | Distributed wireless communication base station system and communication method | |
| CN101651498B (en) | Repeater and method for removing pilot frequency pollution by same | |
| EP2733976A1 (en) | System, device, and method for transmitting multi-input-multi-output signals | |
| CN110224704B (en) | Radio frequency system and base station equipment | |
| US9191952B2 (en) | Wireless communication device, wireless communication method, and wireless communication system | |
| US11722207B2 (en) | Repeater system using umbrella base station | |
| KR100758883B1 (en) | Digital multiple path signal matching device of repeater | |
| KR101868848B1 (en) | Device for Canceling Passive Intermodulation Signal | |
| US11128387B2 (en) | Wireless data transmission | |
| Maier et al. | Phase noise cancellation performance in self-heterodyning transceivers for wireless backhaul applications | |
| Franco-Martínez et al. | Solving Self-Interference Issues in a Full-Duplex Radio Transceiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140226 Termination date: 20160222 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |