CN101335963B - Receiving level strength indication computing method and apparatus - Google Patents
Receiving level strength indication computing method and apparatus Download PDFInfo
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- CN101335963B CN101335963B CN2007101179682A CN200710117968A CN101335963B CN 101335963 B CN101335963 B CN 101335963B CN 2007101179682 A CN2007101179682 A CN 2007101179682A CN 200710117968 A CN200710117968 A CN 200710117968A CN 101335963 B CN101335963 B CN 101335963B
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Abstract
The present invention provides a receiving level intensity indication computing method, comprising the following steps: performing dynamic shift process on input IQ data, shifting for M1; intercepting the input IQ data after shifting from the receiving signals, computing discrepant digit M2 of the energy sum E0 and the reference level energy with the same digit, obtaining the energy sum E0' through shifting the energy sum E0 for M2; respectively comparing the energy sum E0' with the reference level, computing the final reference level; computing the dynamic adjusting level value of M1 and M2; computing the final reference level value and the dynamic adjusting level value to receive the signal level value. Meanwhile, disclosed is a receiving level intensity indication computing device, comprising a dynamic shifting process unit, an energy shifting process unit, a final reference level computing unit, a dynamic adjustment level computing unit and a receiving signal level computing unit. The receiving level intensity indication computing method provided by the present invention improves computing accuracy for the system to receive the level intensity indication, with simple operation and strong practicability.
Description
Technical field
The present invention relates to field of mobile communication, particularly a kind of receiving level strength indication computing method and device in the wireless telecommunication system.
Background technology
In field of wireless communication, the base station needs according to the travelling carriage level intensity indication that receives, and the dynamic adjustments base station is in the transmitting power of shared channel transmitting power of this travelling carriage and travelling carriage.In addition, when the base station adopts multi-diversity to receive, judge that whether effectively each road diversity signal also needs to rely on the travelling carriage level intensity that receives to indicate and select, thus this just to require base station receiver to have receiving level strength indication comparatively accurately be the computing capability of RSSI.
In the wireless telecommunication system of reality, fixed-point processor is generally adopted in the realization of Base-Band Processing, because fixed-point processor is handled the limitation of bit wide and disposal ability, the simple method of using traditional computing formula to calculate RSSI is no longer suitable, as seen, realize that a kind of RSSI computational methods of fixed-point processor that are applicable to have necessity.
Application number is that the Chinese patent " a kind of method that is applicable to the dynamic adjustment baseband receiving signals of mobile communication system " of CN200510055355 discloses a kind of RSSI computational methods, its core concept be each symbol IQ data of training sequence bits to received signal do I, Q mould value and, again with each symbol I, Q mould value and addition, add and be energy reference with this, inquiry energy level correspondence table obtains the RSSI level value.Wherein the energy level correspondence table is by the instrument conjunction measuring, and traveled through each level point, the advantage of the method is that computational methods are simple, I, Q mould value and addition can not overflowed, be convenient to the realization of fixed-point processor in the system, but since adopt I, Q mould value and mode measure energy, stability and accuracy that energy calculates are relatively poor, simultaneously there is the unsettled little level reference of energy in the energy level correspondence table, so the low shortcoming of the method RSSI accuracy in computation also clearly.
Summary of the invention
In order to solve the problem that exists in the above-mentioned patent disclosure method, the accuracy of RSSI computational methods in the raising system under the condition of using fixed-point processor, the present invention proposes a kind of receiving level strength indication computing method that is applicable to fixed-point processor, may further comprise the steps:
Step 101: input IQ data are done dynamic shifting processing, displacement figure place M
1
Step 102: according to the energy and the E that from received signal, intercept the input IQ data after being shifted with the stationary window position
0The figure place M that differs with the reference level energy
2, with described energy and E
0Displacement M
2Obtain energy and E
0', wherein the figure place of reference level energy is identical;
Step 103: with described energy and E
0' contrast with reference level respectively, with E
0' differ the corresponding reference level of absolute value minimum as final reference level value;
Step 104: by described M
1, M
2Calculate and dynamically adjust level value;
Step 105: final reference level value is added dynamic adjustment level value calculate required received signal level value.
In the described step 101 dynamically shifting processing keep bit wide and need guarantee in the step 102 signal energy and calculate not exceed the fixed-point processor bit wide and overflow.M when input IQ data exceed dynamic shifting processing and keep bit wide
1For exceeding the bit wide figure place, M when input IQ data do not exceed dynamic shifting processing and keep bit wide
1Be 0.
In the described step 102, the principle of stationary window position intercepting is the comparatively stable signal bits of intercepting received signal.Energy and E
0Figure place during greater than reference level energy figure place, differ figure place M
2For negative, as energy and E
0Figure place during less than reference level energy figure place, differ figure place M
2For just.
In the described step 103, signal energy and displacement M
2, work as M
2Calculating energy and moving to left when negative is worked as M
2Be timing calculating energy and moving to right.Final reference level is and displacement M
2Back energy absolute value differs minimum reference level.
In the described step 104, dynamically adjust level value according to M
1, M
2Calculating obtains.
The present invention also provides a kind of receiving level strength indication to calculate device, comprising:
Dynamically the shifting processing unit is used for input IQ data are dynamic shifting processing M
1
The energy-shift processing unit is connected with dynamic shifting processing unit, is used for intercepting with the stationary window position according to received signal the energy and the E of the input IQ data after being shifted
0The figure place M that differs with the reference level energy
2, with described energy and E
0Shift to right or left obtains energy and E
0', wherein the figure place of reference level energy is identical;
Final reference level computing unit is connected with the energy-shift processing unit, is used for described energy and E
0' contrast with reference level respectively, with E
0' differ the corresponding reference level of absolute value minimum as final reference level value;
Dynamically adjust the level computing unit, be used for described M according to dynamic shifting processing unit and the input of energy-shift processing unit
1, M
2Calculate and dynamically adjust level value;
The received signal level computing unit is used for that final reference level value is added dynamic adjustment level value and calculates required received signal level value.
In the described dynamic shifting processing unit, dynamically shifting processing reservation bit wide should guarantee described signal energy and E
0Do not exceed the fixed-point processor bit wide and overflow, wherein dynamically shifting processing keeps bit wide and is determined by the fixed-point processor bit wide.When input IQ data exceed dynamic shifting processing and keep bit wide, M
1Exceed the bit wide figure place for what input IQ data exceeded that dynamic shifting processing keeps bit wide, when input IQ data do not exceed dynamic shifting processing and keep bit wide, M
1Be 0.
Are comparatively stable parts of received signal of intercepting with the input IQ data after the intercepting displacement of stationary window position in the described energy-shift processing unit, described energy and computing formula be I
2+ Q
2Wherein, choosing of reference level should meet the following conditions:
The figure place of the reference energy that calculates according to reference level should be identical.Wherein, reference energy draws according to the IQ data computation of input after dynamic shifting processing of reference level correspondence, and this figure place that dynamically is shifted is that reference level is adjusted figure place.
As energy and E
0Figure place during greater than reference level energy figure place, differ figure place M
2For negative, as energy and E
0Figure place during less than reference level energy figure place, differ figure place M
2For just.
In the described dynamic adjustment level computing unit, dynamically adjust level value according to M
1, M
2And the calculating of reference level adjustment figure place obtains.
Method of the present invention compared with prior art has following beneficial effect:
(1) the present invention has utilized the level point with stable energy characteristic to be benchmark, and calculate each RSSI level value by formula, avoided effectively in the existing look-up method, with the mould value and mode measure the poor stability that energy causes, reaching and adopting the unsettled little level point of energy is the influence that benchmark causes computational accuracy to descend, and has promoted the accuracy in computation of system RSSI;
(2) the computational methods computational complexity of the present invention's proposition is low, and stronger system's practical application is arranged.
Description of drawings
Fig. 1 is that receiving level strength indication of the present invention is calculated the apparatus structure block diagram;
Fig. 2 is the receiving level strength indication computing method flow chart of the specific embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the receiving level strength indication computing method and the device of the specific embodiment of the invention is described in detail.The present invention is a benchmark with the level with stable energy characteristic, calculates the level intensity of received signal by formula.
Fig. 1 is that receiving level strength indication of the present invention is calculated the apparatus structure block diagram, comprises dynamic shifting processing unit among the figure, the energy-shift processing unit, and final reference level computing unit is dynamically adjusted the level computing unit, the received signal level computing unit.Wherein,
Dynamically the shifting processing unit is used for input IQ data are done dynamic shifting processing, and preserves displacement figure place M
1Wherein, dynamically shifting processing reservation bit wide should guarantee described signal energy and E
0Do not exceed the fixed-point processor bit wide and overflow, wherein dynamically shifting processing keeps bit wide and is determined by the fixed-point processor bit wide.When input IQ data exceed dynamic shifting processing and keep bit wide, M
1Exceed the bit wide figure place for what input IQ data exceeded that dynamic shifting processing keeps bit wide, when input IQ data do not exceed dynamic shifting processing and keep bit wide, M
1Be 0.
The energy-shift processing unit is connected with dynamic shifting processing unit, receives the data after being shifted, and according to the energy and the E that intercept the input IQ data after being shifted in the received signal with the stationary window position
0The figure place M that differs with the reference level energy
2, M
2For with energy and E
0Reach the reference level Energy Conversion and become the poor of binary system figure place afterwards, with described energy and E
0Shift to right or left obtains energy and E
0', wherein the figure place of reference level energy is identical.With the input IQ data after the intercepting displacement of stationary window position are comparatively stable training sequence part of received signal of intercepting, described energy and E
0Computing formula be I
2+ Q
2
Wherein, choosing of reference level should meet the following conditions:
The figure place of the reference energy that calculates according to reference level should be identical.Wherein, reference energy draws according to the IQ data computation of input after dynamic shifting processing of reference level correspondence, and this figure place that dynamically is shifted is that reference level is adjusted figure place.
As energy and E
0Figure place during greater than reference level energy figure place, differ figure place M
2For negative, as energy and E
0Figure place during less than reference level energy figure place, differ figure place M
2For just.
Final reference level computing unit is connected with the energy-shift processing unit, is used for described energy and E
0' contrast with reference energy respectively, with E
0' differ the corresponding reference level of absolute value minimum as final reference level value;
Dynamically adjust the level computing unit, be used for described M according to dynamic shifting processing unit and the input of energy-shift processing unit
1, M
2Calculate and dynamically adjust level value; The computing formula of dynamically adjusting level value is (M
1-reference level is adjusted figure place) * 10log4dBm+M
2* 10log2dBm.
The received signal level computing unit is used for that final reference level value is added dynamic adjustment level value and obtains required received signal level value.
Fig. 2 is the receiving level strength indication computing method flow chart of the specific embodiment of the invention.Present embodiment is realized in the gsm wireless communication system, adopts TI6416 fixed DSP (Digital SignalProcessing, digital signal processor) processor, mainly may further comprise the steps:
Because present embodiment adopted fixed DSP processor bit wide, dynamically shifting processing keeps bit wide by the decision of fixed-point processor bit wide, and dynamically shifting processing keeps bit wide and need guarantee signal energy and do not exceed the fixed-point processor bit wide and overflow.When input IQ data exceed dynamic shifting processing and keep bit wide, M
1Exceed the bit wide figure place for what input IQ data exceeded that dynamic shifting processing keeps bit wide, when input IQ data do not exceed dynamic shifting processing and keep bit wide, M
1Be 0.
In the present embodiment, dynamically shifting processing keeps bit wide and is set to 15, and promptly 15 with the interior shifting processing of not doing, and surpasses 15 and is shifted into 15 and preserve displacement figure place M
1Dynamically the shifting processing unit at first receives a GSM time slot signal, and intensity is-60dBm that its energy is 22, so the figure place M that is shifted
1=22-15=7.
Step 102: from received signal,, calculate the energy and the E of the IQ data after the described displacement with the input IQ data after the stationary window intercepting displacement
0The figure place M that the reference level energy identical with figure place differs
2, with described energy and E
0Shift to right or left M
2Obtain energy and E
0';
Wherein, stationary window is used for the length of intercept signal and required signal location.The length of stationary window is different in different communication systems, depends on the characteristics of signals in the system.
As energy and E
0Figure place during greater than reference level energy figure place, differ figure place M
2For negative, energy and E
0Move to left, as energy and E
0Figure place during less than reference level energy figure place, differ figure place M
2For just, energy and E
0Move to right.
Wherein, choosing of reference level should meet the following conditions:
The figure place of the reference energy that calculates according to reference level should be identical.Wherein, reference energy draws according to the IQ data computation of input after dynamic shifting processing of reference level correspondence, and this figure place that dynamically is shifted is that reference level is adjusted figure place.
In the present embodiment, the signal location of stationary window intercepting is from the training sequence start bit of GSM time slot signal, and length is 23.Energy and computational methods as follows:
E
0＝I
2+Q
2
Present embodiment is chosen 3 reference levels, is respectively-80dBm-81dBm ,-82dBm.Adopt GSM comprehensive tester CMU300 to calculation element input GSM time slot signal of the present invention.Below with-80dBm is an example, reference level energy calculation process is done to describe:
1, at first to the GSM signal of GSM comprehensive tester CMU300 input-80dBm;
2, the GSM signal through A/D (analog/digital) sampling back to energy-shift processing unit incoming level size is-the IQ data of 80dBm signal;
3, input IQ data are done dynamic shifting processing, obtain-signal of 80dBm exceeds dynamic shifting processing and keep 4 of bit wides, promptly in the present embodiment reference level to adjust figure place be 4;
4, with the IQ data after the dynamic shifting processing of 23 of stationary window interceptings;
5, utilize formula E
0=I
2+ Q
2Calculate by stationary window intercepting-energy of 80dBm signal and be 2014281.
-81dBm, the computational process of-82dBm is identical, is respectively 1600000,1270951 by the energy of the signal of stationary window intercepting.
Therefore ,-80dBm ,-81dBm, the reference energy of-82dBm correspondence is respectively 2014281,1600000,1270951.
Displacement back IQ data energy and be 3201301 is compared displacement figure place M with the reference energy position
2=1, M
2For with energy and 3201301 and reference energy all be converted into the poor of figure place after the binary system.
ENERGY E after the displacement
0' be 1600650.
Step 103: with described energy and E
0' contrast with reference energy respectively, with E
0' differ the corresponding reference level of absolute value minimum as final reference level value;
ENERGY E after the displacement
0' 1600650 are nearest to distance with reference energy 1600000, therefore, get-the final reference level of 81dBm conduct.
Step 104: by described M
1, M
2Calculate and dynamically adjust level value;
The principle of dynamically adjusting the level value computing formula is as follows:
Based on rating formula 1dBm=10log (P/0.001w), P
1, P
2Be respectively the performance number that signal moves front and back, because P
1, P
2Between have following relation: P
1=2P
2, therefore:
10log(P
1/0.001w)-10log(P
2/0.001w)＝10log(P
1/P
2)＝10log(2)＝3.0103dBm
So when the signal energy of calculating gained is made shifting processing, power of every displacement will have the magnitude of 10log2dBm to change.
When signal energy moved the n position, the power before and after moving had following relation:
P
1＝2
nP
2
Therefore, being changed to of mobile n position power:
10log(P
1/0.001w)-10log(P
2/0.001w)＝10log(2
nP
2/P
2)＝n10log(2)dBm＝n3.0103dBm
So when mobile n position, power will have the change of n10log2dBm.
Certainly except that needs energy is carried out the shifting function in the actual operation, for avoiding that overflow problem just takes place when the signal calculated ENERGY E, shifting function to the IQ data also is necessary, so whenever move the influence to the performance number conversion when the operation of IQ data shift takes place following analysis can be arranged:
Work as I
1=2I
2, Q
1=2Q
2The time characteristic arranged:
I
1 2+Q
1 2＝(2I
2)
2+(2Q
2)
2＝4(I
2 2+Q
2 2)
Get P
1=4P
2, therefore obtain:
10log(P
1/P
2)＝10log(4)dBm＝6.0206dBm
Can learn that thus when whenever mobile one of IQ data, power has the change of 10log4dBm.
When mobile n position, I is arranged
1=2
nI
2, Q
1=2
nQ
2,
Therefore,
So, 10log (P
1/ P
2)=10log (4
n)=n10log (4)=n6.0206dBm
When the mobile respectively n of I, the Q of signal position, power will have the change of n10log4dBm.
According to the described formula characteristic of principle, as IQ data shift M
1, signal energy displacement M
2The time, signal power will have (M
1-reference level is adjusted figure place) * 10log4dBm+M
2The variation of * 10log2dBm, therefore, with (M
1-reference level is adjusted figure place) * 10log4dBm+M
2* 10log2dBm is as dynamically adjusting level value.
Dynamically adjust * 6+ (1) * 3 of level value=(7-4)
Step 105: final reference level value is added dynamic adjustment level value calculate required received signal level value.
The received signal level value=-81+ (7-4) * 6+ (1) * 3=-60
Provide the received signal that calculates with the method for prior art according to the present invention below and optimize the table of comparisons of front and back:
Computational methods of the present invention have as can be seen from the table improved the accuracy in computation of received signal
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a receiving level strength indication computing method is used for fixed-point processor, it is characterized in that, comprises the following steps:
Step 101: input IQ data are done dynamic shifting processing, displacement figure place M
1
Step 102: from received signal,, calculate the energy and the E of the IQ data after the described displacement with the input IQ data after the stationary window intercepting displacement
0The figure place M that the reference level energy identical with figure place differs
2, with described energy and E
0Displacement M
2Obtain energy and E
0';
Step 103: with described energy and E
0' contrast with the reference level energy respectively, with E
0' differ the corresponding reference level of absolute value minimum as final reference level value;
Step 104: calculate dynamically adjustment level value by described M1, M2, wherein, described dynamic adjustment level value is (the M1-reference level is adjusted figure place) * 10log4dBm+M2 * 10log2dBm;
Step 105: final reference level value is added dynamic adjustment level value calculate the received signal level value.
2. receiving level strength indication computing method as claimed in claim 1 is characterized in that, the intercepting of described stationary window be stabilization signal part in the received signal.
3. receiving level strength indication computing method as claimed in claim 1 is characterized in that, described displacement M
2For with energy and E
0And the reference level Energy Conversion becomes the poor of binary system figure place afterwards, energy and E
0Figure place during greater than reference level energy figure place, M
2For just, calculating energy and E
0Move to right, as energy and E
0Figure place during less than reference level energy figure place, M
2For negative, calculating energy and E
0Move to left.
4. as claim 1 or 2 or 3 described receiving level strength indication computing methods, it is characterized in that the reservation bit wide of described dynamic shifting processing should guarantee described signal energy and E
0Do not exceed the fixed-point processor bit wide, wherein dynamically shifting processing reservation bit wide is determined by the fixed-point processor bit wide.
5. receiving level strength indication computing method as claimed in claim 4 is characterized in that, when input IQ data exceed dynamic shifting processing and keep bit wide, and M
1For input IQ data exceed the figure place that dynamic shifting processing keeps bit wide, when input IQ data do not exceed dynamic shifting processing and keep bit wide, M
1Be 0.
6. as claim 1 or 2 or 3 described receiving level strength indication computing methods, it is characterized in that, choosing of reference level should meet the following conditions: the figure place of the reference energy that calculates according to reference level should be identical, wherein, reference energy draws according to the input IQ data computation after dynamic shifting processing of reference level correspondence, and this figure place that dynamically is shifted is that reference level is adjusted figure place.
7. a receiving level strength indication is calculated device, it is characterized in that, comprising:
Dynamically the shifting processing unit is used for input IQ data are done dynamic shifting processing displacement figure place M
1
The energy-shift processing unit is connected with dynamic shifting processing unit, is used for intercepting with the stationary window position according to received signal the energy and the E of the input IQ data after being shifted
0The figure place M that differs with the reference level energy
2, with described energy and E
0Shift to right or left obtains energy and E
0', wherein the figure place of reference level energy is identical;
Final reference level computing unit is connected with the energy-shift processing unit, is used for described energy and E
0' contrast with the reference level energy respectively, with E
0' differ the corresponding reference level of absolute value minimum as final reference level value;
Dynamically adjust the level computing unit, be used for M according to described dynamic shifting processing unit and the input of energy-shift processing unit
1, M
2And the dynamic level value of adjusting of reference level adjustment figure place calculating, wherein, described dynamic adjustment level value is (the M1-reference level is adjusted figure place) * 10log4dBm+M2 * 10log2dBm;
The received signal level computing unit is used for that final reference level value is added dynamic adjustment level value and obtains required received signal level value.
8. receiving level strength indication as claimed in claim 7 is calculated device, it is characterized in that, in the described dynamic shifting processing unit, dynamically shifting processing reservation bit wide should guarantee described signal energy and E
0Do not exceed the fixed-point processor bit wide and overflow, wherein dynamically shifting processing keeps bit wide and is determined by the fixed-point processor bit wide.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1472904A (en) * | 2003-03-27 | 2004-02-04 | 东方通信科技发展有限公司 | CDMA receiver system with digital AGC |
| CN1731714A (en) * | 2005-09-02 | 2006-02-08 | 中兴通讯股份有限公司 | System and method for testing RF module upstream channel gain and isolation degree |
| CN1835487A (en) * | 2005-03-18 | 2006-09-20 | 中兴通讯股份有限公司 | Melthod of dynamic regulating baseband receiving signals adapting to mobile communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1472904A (en) * | 2003-03-27 | 2004-02-04 | 东方通信科技发展有限公司 | CDMA receiver system with digital AGC |
| CN1835487A (en) * | 2005-03-18 | 2006-09-20 | 中兴通讯股份有限公司 | Melthod of dynamic regulating baseband receiving signals adapting to mobile communication system |
| CN1731714A (en) * | 2005-09-02 | 2006-02-08 | 中兴通讯股份有限公司 | System and method for testing RF module upstream channel gain and isolation degree |
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