CN103401624A - Method for detecting SWR (standing-wave ratio) of PDD (Frequency Division Duplex) LTE (Long Term Evolution) RRU (Remote Radio Unit) - Google Patents
Method for detecting SWR (standing-wave ratio) of PDD (Frequency Division Duplex) LTE (Long Term Evolution) RRU (Remote Radio Unit) Download PDFInfo
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Abstract
The invention discloses a method for detecting the SWR of a PDD LTE RRU. The method comprises the steps as follows: upper sum feedback link time delays of an RRU downlink plate are measured; for each channel, a CPU controls a front reverse changeover switch to be switched to the forward direction for power counting; an FPGA (field programmable gate array) performs baseband power and forward power counting on corresponding channels according to control signals; firstly, the baseband power is counted, and forward power is counted after the upper sum feedback link time delays of the downlink plate are measured lingeringly; likewise, the CPU controls the front reverse changeover switch to be switched to a reverse direction, reverse power and corresponding baseband power are counted; the CPU calculates a difference value of the forward power and the baseband power corresponding to the reverse power, and new forward power or reverse power is calculated; and the CPU calculates the SWR with the calculated forward power or reverse power.
Description
Technical field
The present invention relates to communication technical field, exactly, relate to standing-wave ratio detecting method in a kind of FDD LTE RRU system, the standing-wave ratio false alarm problem that the method can avoid forward power and backward power statistics may not cause in the same time.
Background technology
LTE (Long Term Evolution, Long Term Evolution) is the Long Term Evolution of 3G, and namely said 4G, comprise the TDD(time division duplex), the FDD(Frequency Division Duplexing (FDD)) two kinds of dual-modes.Application FDD(Frequency Division Duplexing (FDD)) LTE of formula is FDD-LTE, and the characteristics of fdd mode are that system receives simultaneously and transmits on two symmetrical frequency channels that separate, and with guaranteeing that frequency range is separated, receives and transfer channel.
In radio frequency link, standing-wave ratio is one and is used for representing the numerical value whether antenna and electric wave transmitting station mate.If the value of standing-wave ratio equals 1, the electric wave that the expression emission is transferred to antenna, without any reflection, is all launched, and this is optimal situation; If standing wave ratio greater than 1, represents that some electric wave is reflected back, the electric wave that is reflected can produce quite high voltage at the transmitting station delivery outlet, likely damages transmitting station.RRU (Remote Radio Unit, remote radio unit (RRU)) in, usually with the operating state of standing-wave ratio real time reaction power amplifier, play the effect of Real-time Alarm, when standing-wave ratio surpasses certain value, will automatically close power amplifier, therefore for this value, must detect correctly the possibility that false alarm reduction is alert.
In TDD LTE, due to a segment protect time slot being arranged in frame structure, can in the protection time slot, insert the data of known power, by forward power and the backward power of adding up relevant position, detect standing-wave ratio; But neither one power keeps constant position in FDD LTE system frame structure, adopts TDD standing-wave ratio scheme obviously unworkable; Simultaneously in the RRU system, feed-forward link and reverse feedback link often share same feedback path, can cause like this forward power and the backward power of each statistics is not corresponding same one piece of data, with one group of such data, detect the possibility that standing-wave ratio has false alarm, therefore in order to solve such contradiction, for FDD LTE RRU system standing-wave ratio, detect and must adopt new scheme.
Summary of the invention
The present invention is directed to FDD LTE RRU system and proposed a kind of new standing-wave ratio detecting method, with solving in the RRU system, before, anti-power statistic is to shared same feedback path, causing forward power and the backward power of each statistics is not corresponding same one piece of data, the standing-wave ratio false alarm problem that may cause.
Technical scheme of the present invention is a kind of FDD LTE remote radio unit (RRU) standing-wave ratio detecting method, the power amplifier of CPU, FPGA, analog to digital converter, multidiameter option switch and a plurality of passages is set in remote radio unit (RRU), the power amplifier of CPU, transducer, multidiameter option switch, each passage is connected respectively with FPGA, and power amplifier, multidiameter option switch, analog to digital converter connect and compose based on feedback link successively; Standing-wave ratio detects and comprises the following steps,
Step 1, measure under RRU on andante and the based on feedback link time delay, and be designated as delay value T;
Step 2, CPU issues a signal to multidiameter option switch through FPGA, selects a passage to process; CPU issues a signal to the power amplifier of selected passage through FPGA, this power amplifier is to the data of based on feedback link output forward direction;
Step 3, FPGA carries out base band power and forward power statistics according to the data that based on feedback link returns to respective channel, comprises and at first starts to add up base band power, postpones to start to add up forward power after delay value T; And take time of starting to add up base band power as with reference to 3 statistics gained base band power and the forward powers of read step after delay scheduled time, and output to CPU after being converted to base band power conversion value b and forward power conversion value a;
Step 4, CPU issues a signal to the power amplifier of selected passage through FPGA, and this power amplifier is to the reverse data of based on feedback link output;
Step 5, FPGA carries out base band power and backward power statistics according to the data that based on feedback link returns to respective channel, comprises and at first starts to add up base band power, postpones to start to add up backward power after delay value T; And take time of starting to add up base band power as with reference to 6 statistics gained base band power and the backward powers of read step after delay scheduled time, and output to CPU after being converted to base band power conversion value d and backward power conversion value c;
Step 6, CPU calculates the difference between base band power conversion value b that forward direction is corresponding and oppositely corresponding base band power conversion value d, calculates that new forward power is a-(b-d) or new backward power c-(b-d);
Step 7, CPU calculates standing-wave ratio according to new forward power a-(b-d) and backward power conversion value c, or, according to new backward power c-(b-d) and forward power conversion value a, calculates standing-wave ratio;
Step 8, if also have other passages that do not detect, return to step 2 and select a new passage to detect standing-wave ratio, if do not have detection of end.
And the scheduled time is 15ms, in step 3, by the FPGA internal counter, controls and to produce respectively base band power statistic sign, forward power statistical mark, power and read sign, comprises and at first produces the base band power statistic sign; Then the base band power statistic sign postpones to produce the forward power statistical mark after lower delay value T; Finally, after the base band power statistic sign postponed 15ms, generation power read sign; Base band power and forward power timing statistics are a LTE signal wireless frame length 10ms.
And the scheduled time is 15ms, in step 5, by the FPGA internal counter, controls and to produce respectively base band power statistic sign, forward power statistical mark, power and read sign, comprises and at first produces the base band power statistic sign; Then the base band power statistic sign postpones to produce the backward power statistical mark after delay value T; Finally, after the base band power statistic sign postponed 15ms, generation power read sign; Base band power and backward power timing statistics are a LTE signal wireless frame length 10ms.
And, in step 3 and 5, according to formula 10 * log
10(power) change, wherein power is base band power, forward power or the backward power of statistics.
when said method had solved in FDD LTE RRU system standing-wave ratio and detects, forward power and backward power statistics can not guarantee the problems such as detection mistake that synchronization may cause, a kind of new forward power and backward power computational methods have been proposed, when statistics forward power and backward power, add up simultaneously its corresponding base band power, corresponding relation by base band power and forward power and backward power, extrapolate forward power and backward power under identical base band power, with forward power and the backward power that obtain this moment, calculate standing-wave ratio, checking shows that adopting this programme to reach solves standing-wave ratio false alarm problem.Specifically, the present invention has following advantage:
1, base band power statistic, forward power statistics, backward power statistics all realize with FPGA, and timing statistics is all consistent with the LTE radio frames, reduces the standing-wave ratio false alarm problem that the power statistic error may cause as far as possible.
2, CPU is responsible for the switching of passage, front reverse control signal, and the calculating of last standing-wave ratio, avoids FPGA to do division arithmetic, saves the FPGA resource, flexible operation.
3, in FDD LTE RRU system, forward power and backward power statistics can not corresponding contradiction with one piece of data, can solve by the two being shifted onto to same base band power place.
The accompanying drawing explanation
Fig. 1 is the multichannel RRU standing-wave ratio detection system block diagram of the embodiment of the present invention.
Fig. 2 is the multipath RRU standing-wave ratio overhaul flow chart of the embodiment of the present invention.
Fig. 3 is that the base band power of the embodiment of the present invention and forward power and backward power statistical mark and power read the sign sequential chart.
Embodiment
Below in conjunction with drawings and Examples, describe technical solution of the present invention in detail.
Fig. 1 is the multichannel RRU standing-wave ratio detection system block diagram of embodiment, mainly containing several parts forms: central processor CPU, programming logic gate array FPGA, analog to digital converter, multidiameter option switch, power amplifier etc., be provided with N passage, and have to connect respectively antenna 1,2 ... the power amplifier 1,2 of N ... N.Particular hardware is embodied as prior art.The function that this method utilizes modules to realize is as follows: CPU is responsible for the calculating of standing-wave ratio and the switching of passage and front reverser; FPGA is responsible for the statistics of base band and forward power and backward power, and wherein, the position of baseband signal power statistic is the data by after the IR interface; Analog to digital converter is responsible for that the analog signal figure of based on feedback link is turned to FPGA statistics forward power and backward power is used; Multidiameter option switch carries out routing to the multi-channel rf input signal, guarantees that a certain moment can only have the feedback signal of a road power amplifier to process; By CPU, control and make power amplifier export respectively forward direction or reverse signal to based on feedback link.
Fig. 2 is the multipath RRU standing-wave ratio overhaul flow chart of embodiment, and the standing-wave ratio detecting step of each passage is identical, and the embodiment main-process stream is as follows:
Step 1, measure under RRU on andante and the based on feedback link time delay, remembers that this delay value is T.
The present invention needs Measurement accuracy data in advance through based on feedback link, to enter the time delay of FPGA from the IR interface of RRU, and while guaranteeing the subsequent power statistics, the corresponding same one piece of data of base band power and forward power and backward power, should measure respectively for this length of delay under different bandwidth; Wherein the IR interface is the interface of transfer of data between BBU and RRU.Measure in advance acquired results and can be saved in CPU, can dispensing FPGA during every task.Concrete measurement implementation is prior art, and it will not go into details in the present invention.Based on feedback link comprises power amplifier, multidiameter option switch, analog to digital converter successively.
Step 2, CPU issues a signal to multidiameter option switch through FPGA, selects a passage to process; CPU issues a signal to the power amplifier of selected passage through FPGA, by based on feedback link, export forward signal to FPGA.
During concrete enforcement, can be by CPU by the signal that sends routing to FPGA and control to multidiameter option switch, at power amplifier 1,2 ... between N, switch, so that different passages are carried out to respective handling.FPGA can provide front reverse diverter switch, reverse diverter switch before the signal controlling that before exporting to FPGA by CPU, reverser is controlled, thus make power amplifier export respectively forward direction or reverse signal to based on feedback link.
Step 3, FPGA carries out base band power and forward power statistics according to the data that based on feedback link returns to respective channel, comprises and at first starts to add up base band power, postpones to start to add up forward power after delay value T; And take time of starting to add up base band power as with reference to 3 statistics gained base band power and the forward powers of read step after delay scheduled time, and output to CPU after being converted to base band power conversion value b and forward power conversion value a.
Concrete power statistic is prior art, and it will not go into details in the present invention.Whether base band power, forward power and backward power statistics accurately detect and have the greatest impact standing-wave ratio, affect mainly containing of its accuracy:
1, under RRU on andante and the based on feedback link Time delay measurement whether accurate, under different bandwidth, postponing, measure respectively, guarantee the corresponding of baseband signal and forward signal and reverse signal, so measure in advance in step 1.
2, the time of power statistic, a LTE radio frames is 10ms, to the power of any one section of FDD, is not constant, for the guaranteed output statistics accurately, base band power and forward power and backward power timing statistics are 10ms.
3, at first the sequencing control that base band power, forward power and backward power are added up and power reads, can add up base band power, and delay step 1 records on lower andante He after the based on feedback link time delay and starts to add up forward power.For guaranteeing that the two is for same segment signal, embodiment controls and to produce respectively base band power statistic sign, forward power statistical mark, power and read sign by the FPGA internal counter.As shown in Figure 3, three's pass is: at first produce the base band power statistic sign, the statistics base band power; Then the base band power statistic sign postpones on andante and after the based on feedback link time delay, to produce forward power or backward power statistical mark under step 1 gained, carries out corresponding statistics; Finally, after base band power statistic sign delay scheduled time, produce power and read sign, statistics gained power is read.In embodiment, the scheduled time is got 15ms.During concrete enforcement, statistics power can adopt the multiplier in FPGA to realize, statistical mark sends to the unit of being responsible for statistics in FPGA, can trigger this unit and start statistics.
Step 3 in embodiment, at first produce the base band power statistic sign, the statistics base band power; Then the base band power statistic sign postpones to produce the forward power statistical mark after T, carries out corresponding statistics; Finally, after base band power statistic sign delay scheduled time, generation base band and forward power read sign, and statistics gained power is read.The base band power that finally will add up and forward power are according to formula 10 * log
10(power) conversion, wherein power is the power of above-mentioned statistics.
Step 4, CPU issues a signal to the power amplifier of selected passage through FPGA, and this power amplifier is to the reverse data of based on feedback link output.
Reverse diverter switch before can being controlled by CPU, be switched to and be reversed power statistic.
Step 5, FPGA carries out base band power and backward power statistics according to the data that based on feedback link returns to respective channel, comprises and at first starts to add up base band power, postpones to start to add up backward power after delay value T; And take time of starting to add up base band power as with reference to 6 statistics gained base band power and the backward powers of read step after delay scheduled time, and output to CPU after being converted to base band power conversion value d and backward power conversion value c.
Step 5 in embodiment, at first produce the base band power statistic sign, the statistics base band power; Then the base band power statistic sign postpones to produce the backward power statistical mark after T, carries out corresponding statistics; Finally, after base band power statistic sign delay scheduled time, generation base band and backward power read sign, and statistics gained power is read.The base band power that finally will add up and backward power are according to formula 10 * log
10(power) conversion, wherein power is the power of above-mentioned statistics.
Embodiment first performs step 2,3, and rear execution step 4,5, in fact first perform step 4,5, and the effect of rear execution step 2,3 is equal to.
Step 6, CPU calculates the difference of above-mentioned forward power and the corresponding base band power of backward power, according to difference and forward power, extrapolates lower new forward power consistent with the corresponding base band power of backward power.
As to add up rear conversion gained forward power conversion value be a, the corresponding base band power conversion value of forward direction is b, the backward power conversion value is c, reverse corresponding base band power conversion value is d, unit is dbfs, according to the corresponding base band power conversion value of forward direction b, with the difference between reverse corresponding base band power conversion value d, calculates that the forward power that makes new advances is a-(b-d);
Be that forward power is calculated to the corresponding base band power of backward power place herein, backward power is calculated to there is identical effect at the corresponding base band power of forward power place, the two rule of following is consistent.According to difference and backward power, extrapolate lower new backward power c-(b-d) consistent with the corresponding base band power of forward power and get final product.
Step 7, forward power and backward power that CPU extrapolates with step 6, substitution standing-wave ratio formula calculates, and this passage standing-wave ratio is calculated and is completed.Specifically can calculate standing-wave ratio according to new forward power a-(b-d) and backward power conversion value c, or, according to new backward power c-(b-d) and forward power conversion value a, calculate standing-wave ratio.The standing-wave ratio formula is prior art, and it will not go into details in the present invention.
For forward power and backward power, the two does not need reality to be worth accurately, and only guaranteed signal of coming from power amplifier is through same decay.
Step 8, if also have other passages that do not detect, return to repeating step 2 and select other passage that does not detect to carry out the standing-wave ratio detection to step 7, until all passage standing-wave ratios are detected and complete.
Above-mentioned example is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not run counter to change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify the substitute mode that all should be equivalence, within being included in protection scope of the present invention.
Claims (4)
1. FDD LTE remote radio unit (RRU) standing-wave ratio detecting method, it is characterized in that: CPU, FPGA, analog to digital converter, multidiameter option switch and a plurality of passages are set in remote radio unit (RRU) power amplifier, the power amplifier of CPU, transducer, multidiameter option switch, each passage is connected respectively with FPGA, and power amplifier, multidiameter option switch, analog to digital converter connect and compose based on feedback link successively; Standing-wave ratio detects and comprises the following steps,
Step 1, measure under RRU on andante and the based on feedback link time delay, and be designated as delay value T;
Step 2, CPU issues a signal to multidiameter option switch through FPGA, selects a passage to process; CPU issues a signal to the power amplifier of selected passage through FPGA, this power amplifier is to the data of based on feedback link output forward direction;
Step 3, FPGA carries out base band power and forward power statistics according to the data that based on feedback link returns to respective channel, comprises and at first starts to add up base band power, postpones to start to add up forward power after delay value T; And take time of starting to add up base band power as with reference to 3 statistics gained base band power and the forward powers of read step after delay scheduled time, and be converted to the base band power conversion value
With the forward power conversion value
After output to CPU;
Step 4, CPU issues a signal to the power amplifier of selected passage through FPGA, and this power amplifier is to the reverse data of based on feedback link output;
Step 5, FPGA carries out base band power and backward power statistics according to the data that based on feedback link returns to respective channel, comprises and at first starts to add up base band power, postpones to start to add up backward power after delay value T; And take time of starting to add up base band power as with reference to 6 statistics gained base band power and the backward powers of read step after delay scheduled time, and be converted to the base band power conversion value
With the backward power conversion value
After output to CPU;
Step 6, CPU calculates the base band power conversion value that forward direction is corresponding
With reverse corresponding base band power conversion value
Between difference, calculate that new forward power is
Or new backward power
Step 7, CPU is according to new forward power
With the backward power conversion value
Calculate standing-wave ratio, or according to new backward power
With the forward power conversion value
, calculate standing-wave ratio;
Step 8, if also have other passages that do not detect, return to step 2 and select a new passage to detect standing-wave ratio, if do not have detection of end.
2. FDD LTE remote radio unit (RRU) standing-wave ratio detecting method as claimed in claim 1, it is characterized in that: the scheduled time is 15ms, in step 3, by the FPGA internal counter, control and to produce respectively base band power statistic sign, forward power statistical mark, power and read sign, comprise and at first produce the base band power statistic sign; Then the base band power statistic sign postpones to produce the forward power statistical mark after lower delay value T; Finally, after the base band power statistic sign postponed 15ms, generation power read sign; Base band power and forward power timing statistics are a LTE signal wireless frame length 10ms.
3. FDD LTE remote radio unit (RRU) standing-wave ratio detecting method as claimed in claim 1, it is characterized in that: the scheduled time is 15ms, in step 5, by the FPGA internal counter, control and to produce respectively base band power statistic sign, forward power statistical mark, power and read sign, comprise and at first produce the base band power statistic sign; Then the base band power statistic sign postpones to produce the backward power statistical mark after delay value T; Finally, after the base band power statistic sign postponed 15ms, generation power read sign; Base band power and backward power timing statistics are a LTE signal wireless frame length 10ms.
4. as FDD LTE remote radio unit (RRU) standing-wave ratio detecting method as described in claims 1 or 2 or 3, it is characterized in that: in step 3 and 5, according to formula
Change, wherein
Base band power, forward power or backward power for statistics.
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| CN107809291A (en) * | 2017-11-08 | 2018-03-16 | 武汉邮电科学研究院 | A kind of TDD and FDD LTE RRU general standing-wave ratio detecting method |
| CN110417485A (en) * | 2019-06-25 | 2019-11-05 | 三维通信股份有限公司 | Standing-wave ratio detecting method, device, computer equipment and readable storage medium storing program for executing |
| CN112235058A (en) * | 2020-10-12 | 2021-01-15 | 江苏亨鑫众联通信技术有限公司 | Standing-wave ratio detection system and method and radio remote unit with system |
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| CN112235058A (en) * | 2020-10-12 | 2021-01-15 | 江苏亨鑫众联通信技术有限公司 | Standing-wave ratio detection system and method and radio remote unit with system |
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