CN1777073B - Device for realizing multi-carrier receiving signal strength indication - Google Patents
Device for realizing multi-carrier receiving signal strength indication Download PDFInfo
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- CN1777073B CN1777073B CN2004100910179A CN200410091017A CN1777073B CN 1777073 B CN1777073 B CN 1777073B CN 2004100910179 A CN2004100910179 A CN 2004100910179A CN 200410091017 A CN200410091017 A CN 200410091017A CN 1777073 B CN1777073 B CN 1777073B
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Abstract
The disclosed device includes first radio frequency filter, low noise amplifier, second frequency filter, down converter, intermediate frequency amplifier, variable gain controller, anti aliasing filter, A/D converter, and signal processor. Through gains of VGC and AGC, the disclosed device obtains value of RSSI so as to avoid complex calculation, save resource. Modifying parameters of part of devices, the invention is available to detect multicarrier RSSI indifferent system formats. Advantages are: better compatibility, lowered cost and capable of indicating signal of each carrier.
Description
Technical field
The present invention relates to the device that multi-carrier receiving signal strength indication RSSI (indication of Received Signal Strength Indicator received signal intensity) realizes, more particularly, is a kind of relatively more novel, simple and device that realize easily.
Background technology
In today of mobile communication technology high speed development, people also increase day by day to the demand of mobile communcations system, under Limited resources, multi-carrier receiver is the development trend of mobile communcations system, and multi-carrier receiving signal strength indication (RSSI) important component part, its relative accuracy has bigger relation to the capacity of system.
The mode of RSSI realization at present mainly contains dual mode: intermediate frequency and base band.As shown in Figure 1, the detailed process that RSSI realizes in the medium-frequency IF unit is: at first with the radiofrequency signal filtering, amplification, the mixing that receive, secondly amplification is coupled the IF signal after the mixing, deliver to analog to digital converter again by wave detector then, deliver to DSP (Digital SignalProcessing) at last and handle.The shortcoming of this method and apparatus be exactly the not high and precision of circuit complexity, integrated level be not very desirable, in addition, the dynamic range of wave detector also is limited.
As shown in Figure 2, the detailed process that RSSI realizes at the intermediate frequency Base Band Unit is: radiofrequency signal filtering, amplification, the mixing that receives obtained low IF signal, after intermediate frequency amplification and the filtering, by the ADC conversion, handled by DSP at last, the digital i/q signal that obtains carries out square operation.The shortcoming of this method and apparatus is exactly the computing complexity, and hardware resource consumption is bigger, causes hardware cost too high.
For multi-carrier receiver, carrying out RSSI with the method and apparatus of Fig. 1, Fig. 2 detects just very complicated, what RSSI detected all is the multi-carrier signal gross energy, can not indicate the energy of every carrier signal, because must just can distinguish every carrier signal with a plurality of RF unit, cost is too high like this, puts off until some time later analog circuit unit and too much also can make the precision that detects reduce, and satisfies new demand so need seek new method and apparatus.
Summary of the invention
The technical problem that the present invention solves has provided a kind of device of realizing simple multi-carrier receiving signal strength indication, realizes that every carrier signal energy detects.
In order to realize above-mentioned target, the present invention just adopts software and radio technique to realize the detection of multi-carrier receiving signal strength indication RSSI, because realize that at received signal processing section RSP (Receive Signal Processing) multicarrier RSSI detects, can indicate the intensity of every carrier signal like this, thus RSSI must be after channel filtering, realize before the AGC.
The structured flowchart of apparatus of the present invention comprises as shown in Figure 3: first radio-frequency filter, low noise amplifier, second radio-frequency filter, low-converter, intermediate frequency amplifier, variable gain controller, frequency overlapped-resistable filter, analog to digital converter and received signal processor; After radiofrequency signal is spuious outside the first radio-frequency filter filtering band, low noise amplifier amplifies, disturb by the second radio-frequency filter filtering frequency mixer mirror phase noise, the arrival low-converter carries out down-converted and converts intermediate-freuqncy signal to, after intermediate frequency amplifier, variable gain controller, deliver to through frequency overlapped-resistable filter and to carry out analog to digital conversion in the described A-D converter and become digital signal, at last, the received signal processor carries out digital demodulation, extraction, filtering to these digital signals and draws each carrier wave received signal intensity indication.
Adopt device of the present invention, can draw the value of RSSI by the gain of VGC and AGC, avoid a lot of complex calculation like this, economize on resources, and can indicate the signal of every carrier wave, therefore have favorable compatibility, for the multicarrier RSSI detection of different systems, only need the part of devices parameter modification of handle assembly to get final product, reduced cost effectively.Said apparatus is realized simply, accuracy of detection is high, can overcome the complexity, the every carrier signal energy of realization that have the RSSI detection now detects, improves accuracy of detection, reduces radio frequency link, improves stable, suitable large-scale production etc., increase with the maximum access customer number amount that guarantees the overloading frequency receiver, reduce cost, the structural reform benefit satisfies the market demand with keen competition.
Description of drawings
Fig. 1 adopts the detection mode to realize RSSI detection architecture block diagram at the IF place.
Fig. 2 realizes RSSI detection architecture block diagram at the base band place.
Fig. 3 is the multi-carrier receiving signal strength indicating structure block diagram of employing software radio of the present invention.
Fig. 4 is the actual table with test results as the indication of the invention process 2 carrier wave received signal intensity.
Fig. 5 is the actual detected graph of a relation as the indication of the invention process 2 multi-carrier receiving signal strengths.
Fig. 6 is the 2 carrier wave received signal intensity indication absolute precision graph of a relation as apparatus of the present invention.
Fig. 7 is the 2 carrier wave received signal intensity indication relative accuracy graph of a relation as apparatus of the present invention.
Embodiment
In the multi-carrier receiver system, what RSSI indicated is the multicarrier gross energy, if indicate the energy of every carrier wave, needs a plurality of RF links.The precise decreasing that factors such as discreteness, the detection tube dynamic range of simulation part of devices is little can cause RSSI to detect brings a lot of inconvenience for like this design and debugging, is unfavorable for producing in batches.
In view of present device level, can adopt the form of software radio to realize multi-carrier receiver, and RSSI indication is the signal energy of every carrier wave, improve for system design and performance and all be beneficial to.Fig. 3 is the multi-carrier receiving signal strength indicating structure block diagram of employing software radio of the present invention.
Below with the method and apparatus that has the received signal intensity indication frequently of the concrete structural wideband overloading of device now.Be embodied as the feasibility that example illustrates method and apparatus of the present invention with the indication of Node B 2 carrier wave received signal intensity.Wherein, first radio-frequency filter among Fig. 3 is a duplexer, mainly is that the filtering band is outer spuious; Low noise amplifier LNA adopts SGA-4586; Second radio-frequency filter adopts LE18A; Low-converter adopts SME1400B-17; Intermediate frequency amplifier adopts SGA-6486; The variable gain controller adopts AA113-310; The anti-filter that mixes repeatedly adopts IF Surface Acoustic Wave Filter LE88F; Analog to digital converter ADC adopts AD80101; Received signal processor adopting ISL5416.
For adopting digital-if architecture to realize that 2 carrier receiver systems are example, determine that the frequency of IF Surface Acoustic Wave Filter and sample frequency are very crucial, according to Nyquist sampling criterion, can learn that the pass of IF frequency and sample frequency is
By the combination interference analytical calculation, obtain IF-FRE f
IFBe chosen as 172.8MHz, sampling rate f
SBe 61.44MHz.Because 2 carrier signals exist jointly before the ADC, and are saturated in order not make ADC, influence accuracy of detection, need choose reasonable Spurious Free Dynamic Range SFDR.
In order to detect the RSSI value of every carrier wave, need be after digital NCO, channel filtering, detect RSSI before the AGC.According to the corresponding relation of AGC function and input power, learn that the RSSI detected value is gain and the reference power sum of AGC gain, numerical-control attenuator VGC, referring to equation (1).
P
RSSI＝k×(G
AGC-G
REF)+P
REF+G
VGC (1)
Wherein, G
AGCBe the gain of AGC, G
VGCBe the gain of variable controller, P
REF, k, G
REFBe constant.
From top equation (1) as can be known: the absolute precision that RSSI detects is the function of AGC gain, variable controller VGC.According to the 3GPP standard, the scope that RSSI detects is-103dBm～-73dBm.In device of the present invention the inside, the variable gain controller is a numerical-control attenuator, and its purpose mainly is decay to occur at neighboring trace, when blocking these large-signals, and other situation following time is straight-through, and the decay controlling value is 0dB.Therefore, in the 3GPP critical field, the AGC gain function that the RSSI detected value is.
P
RSSI＝k×(G
AGC-G
REF)+P
REF (2)
Fig. 4 is the actual table with test results of the invention process 2 carrier wave received signal intensity indication.Fig. 5 is the actual detected graph of a relation of the invention process 2 multi-carrier receiving signal strengths indication.The RSSI accuracy of detection comprises absolute precision and relative accuracy, and relative accuracy is ± 4dB that absolute precision is ± 0.5dB.In order to embody the advantage of the method and apparatus that RSSI of the present invention detects, so just need analyze from absolute precision and relative accuracy.
At first analyze the RSSI absolute precision, Fig. 6 is the 2 carrier wave received signal intensity indication absolute precision graph of a relation of apparatus of the present invention.From equation (2) as can be known, the RSSI absolute precision is only relevant with the AGC gain, but the bandwidth range of operation of receiver is 60MHz, and the ambient temperature of work is-5 ℃～55 ℃.The frequency response of many analogue devices is inconsistent in the 60MHz bandwidth, for identical input power, the value that detects just there are differences, in order to overcome this shortcoming, raising reports precision, apparatus of the present invention can adopt the frequency scanning calibration, is step-length with 200kHz, in the 60MHz scope, write down the poor of detection and reference value, have the FLSH the inside then.Similar with the principle of frequency response, in range of temperature, the change in gain of tunnels analogy device is bigger, cause RSSI to detect and have very mistake,, also need temperature is scanned in order to reduce the influence of variations in temperature to its precision, optional 0.5 ℃ or 1 ℃ of step-length, there are the FLASH the inside in temperature and the corresponding data that detects difference, and the value that at every turn reports just need compensate into the difference of this frequency response and variations in temperature correspondence, can improve absolute precision like this.
Next analyzes the RSSI relative accuracy, and relative accuracy is meant poor that input signal changes and detected value changes, and Fig. 7 is the 2 carrier wave received signal intensity indication relative accuracy graph of a relation of apparatus of the present invention.Suppose that certain moment input signal power is changed to Δ P, learns that according to equation (2) difference of RSSI detected value is k * Δ G
AGC, then the RSSI relative accuracy is Δ P-k * Δ G
AGCBecause Δ P, k be constant, so, the RSSI relative accuracy only with Δ G
AGCRelevant, that is to say that the RSSI relative accuracy only has relation with the AGC algorithm.Relative accuracy is improved, just means that also the AGC linearity needs to improve.In order to satisfy linear requirement all, adopt superior cordic algorithm to realize the computing of I/Q amplitude, avoid I
2/ Q
2Computing.Helps the raising of operation efficiency like this, save the chip hardware resource, and the cordic algorithm computing adopts 8 clock cycle, like this AGC gain the precision that calculates can 0.00013dB, satisfy required precision fully.
At last, this checkout gear also can be used for detecting multi-carrier receiver ACS (Adjacent Channel Selection), because RSSI indicates the performance number of every carrier wave, can map out the ACS performance by the parameter variation, save instrument and raise the efficiency for producing in batches later on.
Claims (4)
1. realize the device of multi-carrier receiving signal strength indication, it is characterized in that this device comprises: first radio-frequency filter, low noise amplifier, second radio-frequency filter, low-converter, intermediate frequency amplifier, variable gain controller, frequency overlapped-resistable filter, analog to digital converter and received signal processor; After radiofrequency signal is spuious outside the first radio-frequency filter filtering band, low noise amplifier amplifies, disturb by the second radio-frequency filter filtering frequency mixer mirror phase noise, the arrival low-converter carries out down-converted and converts intermediate-freuqncy signal to, after intermediate frequency amplifier, variable gain controller, deliver to through frequency overlapped-resistable filter and to carry out analog to digital conversion in the described A-D converter and become digital signal, at last, the received signal processor carries out digital demodulation, extraction, filtering to these digital signals and draws each carrier wave received signal intensity indication; Described received signal processor is by formula P
RSSI=k * (G
AGC-G
REF)+P
REF+ G
VGCObtain described each carrier wave received signal intensity indication; Wherein, G
AGCBe the gain of automatic gain control AGC, G
VGCBe the gain of variable controller, P
REF, k, G
REFBe constant.
2. device as claimed in claim 1 is characterized in that, described variable gain controller adopts numerical-control attenuator, occurs decay during at neighboring trace signal and block signal, and other situation following time is straight-through, and the decay controlling value is 0dB.
3. device as claimed in claim 1 or 2 is characterized in that, first radio-frequency filter adopts duplexer, low noise amplifier adopts SGA-4586, second radio-frequency filter adopts LE18A, and low-converter adopts SME1400B-17, and intermediate frequency amplifier adopts SGA-6486; The variable gain controller adopts AA113-310, and the anti-filter that mixes repeatedly adopts IF Surface Acoustic Wave Filter LE88F, and analog to digital converter adopts AD80101, received signal processor adopting ISL5416.
4. device as claimed in claim 3 is characterized in that, the IF-FRE f of described IF Surface Acoustic Wave Filter
IFBe 172.8MHz, sampling rate F
SBe 61.44MHz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2004100910179A CN1777073B (en) | 2004-11-15 | 2004-11-15 | Device for realizing multi-carrier receiving signal strength indication |
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| CN2004100910179A CN1777073B (en) | 2004-11-15 | 2004-11-15 | Device for realizing multi-carrier receiving signal strength indication |
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| CN1777073A CN1777073A (en) | 2006-05-24 |
| CN1777073B true CN1777073B (en) | 2011-05-11 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070082992A (en) * | 2006-02-20 | 2007-08-23 | 엘지이노텍 주식회사 | Set top box for two-way communication |
| CN102611476A (en) * | 2011-01-20 | 2012-07-25 | 中国科学院微电子研究所 | Twice frequency conversion structure transceiver for 60GHz wireless communication |
| WO2013138067A1 (en) * | 2012-03-14 | 2013-09-19 | Zte (Usa) Inc. | Receiver signal strength indicator meter for automatic antenna alignment in indoor and outdoor mount applications |
| CN103888169A (en) * | 2014-02-21 | 2014-06-25 | 中国人民解放军总参谋部第六十三研究所 | Gain control method for ultra short wave reception channel |
| CN104868959B (en) * | 2014-02-21 | 2018-11-13 | 中国人民解放军总参谋部第六十三研究所 | A kind of ultrashort wave wide interval frequency hopping reception channel field strength detection method |
| CN106301616B (en) * | 2016-08-12 | 2018-10-12 | 矽力杰半导体技术(杭州)有限公司 | The acquisition methods and device of received signal strength indicator |
| CN107212877B (en) * | 2017-05-24 | 2019-07-09 | 西安电子科技大学 | Variable gain mixer amplifier, biological signal collecting and processing chip and system |
| WO2023097461A1 (en) * | 2021-11-30 | 2023-06-08 | 海能达通信股份有限公司 | Multi-carrier receiving method and multi-carrier receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204186A (en) * | 1997-06-21 | 1999-01-06 | 三星电子株式会社 | Receiver with suppressed intermodulation distortion and method for operating the same |
| CN1330456A (en) * | 2000-06-23 | 2002-01-09 | 华为技术有限公司 | Automatic gain control (AGC) method for digital base band |
-
2004
- 2004-11-15 CN CN2004100910179A patent/CN1777073B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204186A (en) * | 1997-06-21 | 1999-01-06 | 三星电子株式会社 | Receiver with suppressed intermodulation distortion and method for operating the same |
| CN1330456A (en) * | 2000-06-23 | 2002-01-09 | 华为技术有限公司 | Automatic gain control (AGC) method for digital base band |
Non-Patent Citations (4)
| Title |
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| CN 1204186 A,全文. |
| CN 1330456 A,全文. |
| 王彦等.数字中频接收机的设计与实现.电讯技术 2004年第5期.2004,(2004年第5期),41-44. |
| 王彦等.数字中频接收机的设计与实现.电讯技术 2004年第5期.2004,(2004年第5期),41-44. * |
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