CN101926144A - Apparatus and method for realizing automatic gain control in orthogonal frequency division multiple access system - Google Patents
Apparatus and method for realizing automatic gain control in orthogonal frequency division multiple access system Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3078—Circuits generating control signals for digitally modulated signals
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/001—Digital control of analog signals
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/70—Gain control characterized by the gain control parameter
- H03G2201/706—Gain control characterized by the gain control parameter being quality indicator, e.g. BER,C/I
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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Abstract
An apparatus for realizing automatic gain control in OFDMA system is provided, the apparatus includes: the automatic gain controller, the Analog-Digital Converter and baseband processing module. A method for realizing automatic gain control in OFDMA system is provided, the method uses the following steps: measuring the Carrier to Interference-plus-Noise Ratio and the receiving power on the data burst of each uplink on a frame-by-frame basis; computing the Interference-plus-Noise power of the (n-1)th frame; obtaining the Interference-plus-Noise receiving power and the available signal receiving power of the nth frame; computing the total receiving power of the nth frame; and obtaining the needed digital AGC gain value according to the corresponding relationship between the total receiving power and the AGC gain value of the nth frame. Using the apparatus and method for realizing automatic gain control in OFDMA system, estimating the available receiving power of the current frame with the amounts of the power adjustment from the base station, the total receiving power of the current frame may be more accurately computed, and the automatic gain control can be realized through the corresponding relationship between the total receiving power and the digital AGC gain.
Description
That automatic growth control is realized in orthogonal frequency division multiple access system fills mould and method and technology field
The present invention relates to the apparatus and method that digital resources obtainment device is controlled in wireless communication system, more particularly to a kind of apparatus and method of the automatic growth control in ofdma communication system.Background technology
In the prior art, for digit wireless communication system, generally using analog down, radiofrequency signal is transformed into intermediate-freuqncy signal, analog-digital converter is then generally utilized again（ ADC：Analog-Digital Converter) analog signal of input is sampled and quantification treatment, and it is converted into data signal.Specifically, the transfer process be by analog signal be quantified as ADC digit set in advance data signal.For example, for the ADC of 8, if defining it changes range into 0-5V, then 11111111 can be used to represent analog signal of the voltage magnitude for 5V.But, the power of analog signal received by receiver can be continually changing, if the analog signal power for being input to analog down is excessive or too small, upwardly or downwardly beyond the working range of analog down, signal saturation or signal-to-noise ratio degradation that analog down is exported will be made.Make ADC saturations if the analog signal power for being input to analog-digital converter is excessive, the ADC will be by signal peak clipping（Namely usually said saturation distortion）；If the analog signal power of receiver front end is too low, larger quantization interference noise can be produced again.Therefore, receiver can use automatic gain control equipment that the amplitude of the analog signal received is adjusted into suitable scope in digit wireless communication system, the problems such as to avoid because of analog signal power is excessive or too small and accordingly produces saturation distortion or signal-to-noise ratio degradation.
Particularly with OFDM (OFDMA：Orthogonal Frequency Division Multiple Address) for communication system, it uses multicarrier and performs scheduling frame by frame, the subcarrier for distributing to each user and the number of subcarriers distributed are change from frame to frame, therefore, the changed power between former frame and a later frame can be very big.In Publication No. CN 1741519A Chinese invention patent application, applicant discloses a kind of apparatus and method that automatic growth control is realized in ofdma communication system, it uses the up-link noise J ± (SNR of following equation acquisition EL (n-1) and EL (n), wherein EL (n-1) the (n-1)th frame of expression：Signal Noise Ratio) estimated value, EL (n) represent n-th frame up-link SNR estimated value：Confirm this
In above formula, NburetRepresent the quantity of data pulse string that will be sent from movement station, i.e. the quantity of the uplink data burst string of distribution in the frame； NFFTRepresent the sum of subcarrier； ΝυτRepresent the quantity of the uplink data symbols of each frame；CINR (m) represents the target CINR of than the m-th data train of pulse； NSCH(m) quantity of the subchannel of than the m-th data train of pulse is distributed in expression；And k represents the power of each subchannel distribution.For above-mentioned equation, because the upper data burst to a certain user may be transmitted before many frames, and the noise and interference level of the noise and interference level and present frame before many frames may be widely different.In addition, using target CINR (Carrier to Interference-plus-Noise Ratio in this application text：Carrier-in-interference noise estimates the useful receiving power of present frame than bed, but target CINR is not always consistent with the CINR values measured in real time, so can also reduce degree of accuracy when estimating the useful receiving power of user.The content of the invention
For the above-mentioned technological deficiency that ofdma communication system in the prior art is caused when carrying out automatic growth control, the invention provides a kind of apparatus and method that automatic growth control is realized in ofdma communication system.
According to one aspect of the present invention there is provided a kind of automatic gain control equipment for being used to control automatic gain in ofdma communication system, it includes：
Automatic gain controller, for receiving the analog signal from radio-frequency head and carrying out Gain tuning to the analog signal；
Analog-digital converter, for the signal of the output end of the automatic gain controller to be converted into data signal；And
Baseband processing module, it includes：
Carrier-in-interference noise is than measuring unit, for receiving the data signal through Digital Down Convert and measuring the carrier-in-interference noise ratio on the data burst of each up-link frame by frame；
Receiving power measuring unit, for receiving the data signal through Digital Down Convert and measuring the receiving power on the data burst of each up-link frame by frame；
The receiving power estimation block of present frame, the receiving power for estimating present frame according to the carrier-in-interference noise ratio and the receiving power.
Wherein, the baseband processing module also includes wireless resource allocation unit, for producing power control information
And send it to the receiving power estimation block of the present frame.
Wherein, the baseband processing module can also include AGC gain calculators, and AGC gain value is obtained for the corresponding relation between the receiving power and AGC gain value of the present frame according to the estimation.
According to it is still another aspect of the present invention to provide a kind of auto gain control method for being used to control automatic gain in ofdma communication system, it comprises the steps：
The carrier-in-interference noise ratio on the data burst of each up-link is measured frame by frame；
The receiving power on the data burst of each up-link is measured frame by frame；
Calculate the interference noise power on the data burst for the data burst serial number m (i) that (n-1) frame distributes to i-th of user；
Obtain the interference noise receiving power and useful signal receiving power of n-th frame；
The interference noise receiving power is added with the useful signal receiving power, the total received power of the n-th frame is drawn；And
According to the corresponding relation between the total received power of the n-th frame and AGC gain value, the digital AGC gain value needed for obtaining.
Wherein, using the wireless resource allocation unit in baseband processing module, produce power control information and send it to the receiving power estimation block of the present frame.
Wherein, using the AGC gain calculators in baseband processing module, corresponding relation between receiving power and AGC gain value based on present frame obtains AGC gain value.
Wherein, the corresponding relation between the receiving power of the present frame and AGC gain value can show as formula form, or form ' or experimental data homologous thread etc..
According to an additional aspect of the present invention, there is provided the baseband processing module in a kind of automatic gain control equipment for ofdma communication system, it is characterized in that, the baseband processing module has the receiving power estimation block of present frame, and the estimation block calculates the receiving power of present frame using following equation：
Ρ,ο, (")
Wherein, NFFTIt is FFT points； NsymbIt is the symbolic number of sub-frame of uplink； NburetIt is the data burst number of ascending wireless resource； Nm(i) be allocated to i-th of user data burst serial number m (i) the subcarrier that is included of data burst and the number of symbol； Ps,m(i) represent distribute to i-th of user data burst serial number m (i) data burst on useful signal receiving power； Pl+N,m(i) represent distribute to i-th user data burst serial number m (i) data burst on interference and noise power；And Pt。t(n) total received power of n-th frame is represented.
According to another aspect of the invention, there is provided a kind of receiver in ofdma communication system.The receiver includes the above-mentioned baseband processing module being used in automatic gain control equipment, and the baseband processing module has the receiving power estimation block of present frame, and the estimation block calculates the receiving power of present frame using following equation：
Ρ'。' (") = N I N (") x PS O (") + N N ¾ 《 (" - " x p', (" -1) realize the apparatus and method of automatic growth control in ofdma communication system using the present invention; the useful receiving power of present frame is estimated by the power adjustment from base station; can more accurately calculate the total received power of present frame, and automatic growth control is realized by the corresponding relation between total received power and digital AGC gain.Brief description of the drawings
Reader after the embodiment of the present invention has been read referring to the drawings, it will more clearly understand various aspects of the invention.Wherein,
Fig. 1 shows the block diagram of the digital AGC that wireless communication system is used in the prior art；Fig. 2 shows to control the schematic flow sheet of digital AGC gain in ofdma communication system as shown in Figure 1；Fig. 3 is shown according to the block diagram for the digital AGC that the present invention is used in wireless communication system；And
Fig. 4 shows to control the schematic flow sheet of digital AGC gain in ofdma communication system as shown in Figure 3.Embodiment
With reference to the accompanying drawings, the embodiment to the present invention is described in further detail.
Fig. 1 shows the block diagram of the digital AGC used in the prior art in wireless communication system.As illustrated, the digital AGC includes automatic gain controller 101, significant bit detector 102, power checker 103, gain calculator 104 and SNR estimators 105.Reference picture 1, power checker 103 measures the power for receiving signal frame by frame, and SNR estimators 105 are by using MAP information (or channel allocation information）The SNR numerical value of next frame is estimated with the CINR of next frame.In more detail, gain calculator 104 calculates the yield value of automatic gain controller 101 using the receiving power measured value received from power checker 103 and from the SNR estimated values of the reception of SNR estimators 105.Then, the yield value is applied on reception signal by the automatic gain controller 101 has expected amplitude to export.Significant bit detector
102 remove unnecessary LSBs from the data flow received by automatic gain controller 101 and the data signal formed are output to channel plug-in unit, for channel demodulation.Wherein, SNR estimators 105 can be implemented separately or configure in gain calculator 104, the gain calculator 104 is by using from slow media access control (LMAC:Low Media Access Control) the data MAP information that receives of digital signal processor DSP, to estimate the SNR numerical value of next frame, and calculates the gain of automatic gain controller 101 by using the SNR estimated values and receiving power measured value.
Fig. 2 shows the schematic flow sheet that digital AGC gain is controlled in ofdma communication system as shown in Figure 1.Reference picture 2, the schematic flow sheet comprises the following steps：
Step 200：Base station uses following equalities（1)（N-2) estimation the in the uplink time period of frame（N-1) the up-link SNR value of frame, wherein, in equation（1) N inburstRepresent the quantity of data pulse string that will be sent from movement station, i.e. the quantity of the uplink data burst string of distribution in the frame； NFFTRepresent the sum of subcarrier； ΝυτRepresent the quantity of the uplink data symbols of each frame；CINR (m) represents the target CINR of than the m-th data train of pulse； NseH(m) quantity of the subchannel of than the m-th data train of pulse is distributed in expression；And k represents the power of each subchannel distribution.
Step 202：Base station is（N-1 the up-link of n-th frame) is calculated in the uplink time period of frame
SNR estimated value EL (n)；
Step 204：Base station measurement（N-1) the extended receiver power P M (n-1) of frame, following equalities are based in the uplink time period of n-th frame and the uplink noise power EN (n) of n-th frame are estimated using EL (n-1) and PM (n-1)；
EL(n - \) = S(n - \)/ N(n - \) . Ar,-PM n -)
PM{n - 1) = S(n - 1) + N(n - 1) EL(n - l) + l
In ofdma communication system, the noise power of up-link is substantially constant over, then the uplink noise power EN (n) of n-th frame can be shown as：
Ε Ν, (,=PM (n -) ≡ Ν (η-, 1) 1)-
EL (n 1)+1
Step 206：Base station calculates the gain of digital AGC using the uplink noise power estimated value EN (n) or extended receiver power-estimation value EP (n) of n-th frame.
Transformational relation between wherein EP (n) and EN (n) can be expressed as
EP(n) = S(n) + N(n)
= N(n) x EL(n) + N(n)
= EN(n) x [EL(n) + \]
= PM("-x Gang+ 1]
EL(n - l) + l
Wherein, using EN (n) and EP (n) come control gain value can using linear calibration as
Or
Gain(n) = \P'hreshM
EP(n)
Further, when using EN (n) linear calibration, presetting expected noise power-value N^es/)。wAnd based on NthresCarry out control gain value with EN (n) ratio；When using EP (n) linear calibration, presetting expected signal power value ^^./£/And based on PthresCarry out control gain value with EP (n) ratio.
Fig. 3 shows the block diagram of the digital AGC used according to the present invention in wireless communication system.Reference picture 3, the digital AGC mainly includes low-noise amplifier, automatic gain controller 300, analog down 302, the analog-digital converter 304, (DDC of Digital Down Convert 306:Digital Down Conversion) and baseband processing module 308.More specifically, the baseband processing module 308 has the receiving power estimation block 3085 of CINR measuring units 3081, receiving power measuring unit 3082, AGC gain calculator 3083, wireless resource allocation unit 3084 and present frame.
Above-mentioned Fig. 3 operation principle is discussed in detail in the angle flowed to from signal.First, antenna receives analog signal and is amplified by low-noise amplifier, and the analog signal after amplification is entered into automatic gain controller 300, radiofrequency signal is transformed into intermediate-freuqncy signal using analog down 302 and entered in analog-digital converter 304；Data signal after being handled through analog-digital converter 304 after output quantization；Digital Down Convert 306 receives the quantization data signal and is passed in baseband processing module 308.For the digital AGC of the present invention, the receiving power estimation block 3085 of present frame is key component.Utilize CINR measuring units 3081 and receiving power measuring unit 3082, in the baseband processing module 308, receiving power measurement is carried out to the data burst for distributing to each user per frame and CINR is measured, and the receiving power measured and CINR numerical value are transported in the receiving power estimation block 3085 of present frame；At the same time, wireless resource allocation unit 3084 produces power control
Information processed and the receiving power estimation block 3085 for being given present frame.Receiving power and CINR numerical value and power control information of the receiving power estimation block 3085 of the present frame according to measured by reception, estimate the receiving power of present frame.Finally, using the corresponding relation between the receiving power and AGC gain value of present frame, AGC gain value is calculated by AGC gain calculator 3083.As shown in figure 3, the AGC gain value is fed back in the automatic gain controller 300 of the input of analog-digital converter 304, the automatic gain control in automatic gain control equipment to realize the present invention.
Fig. 4 shows the schematic flow sheet that digital AGC gain is controlled in ofdma communication system as shown in Figure 3.The Cheng Qian excessively of automatic growth control is realized in the automatic gain control equipment that the present invention is discussed in detail, following physical parameter is pre-defined, Pm (i) represents the total received power on the data burst for the data burst serial number m (i) for distributing to i-th of user；CINRm (i) represents the Signal Interference and Noise Ratio on the data burst for the data burst serial number m (i) for distributing to i-th of user； Ps,mAnd Pl+N,m(i) respectively represent distribute to i-th of user data burst serial number m (i) data burst on useful signal power and the power of interference and noise.
Step 400：Measure the total received power p on the data burst for the data burst serial number m (i) for distributing to i-th of userm(i) with the signal interference-to-noise ratio CINRm (i) on the data burst for the data burst serial number m (i) for distributing to i-th of user;
Step 402：Calculate the interference on the data burst for the data burst serial number m (i) that the (n-1)th frame distributes to i-th of user and the power P of noisel+N,m(i)；
=corpse,《,) (" - 1) =
CINRm{i) = PSMi) /PI+NMi)- '+C precipicesmW(" _l) + l
Equally, if presetting n-th frame is assigned with the user of data burst, useful receiving power previously is PS(), the previous total received power of user that n-th frame is assigned with data burst is, and it is C/Ni that n-th frame, which is assigned with the previous Signal Interference and Noise Ratio of user of data burst,^), then the useful receiving power ^^) with Signal Interference and Noise Ratio C/NBetween relation can be drawn using following equation：
ppre - ppreOne ppre rMpp e
ΓΙ+ΝΜ ^^(Ο― —— ^ ppre = JJVAm(Q χ p pre
' S,m(i) ^J JO pre i m(
7ΚΪΏ ΡΓβ ― PPre I p re ^ KM (i) step 404：Calculate interference and the noise Rx power P of n-th framel+N(n)；
First, the interference of the (n-1)th frame and noise Rx power Pl+N(n-1) it can be obtained using following formula： ρΙ+Ν (" - = N N ∑N("-" x P'+NM ("-consider in ofdma communication system, the interference of n-th frame and noise Rx power are relative to the (n-1)th frame
Interference and noise Rx power variation very little, then
P N (") = M T ∑Nm{i) (n-l)x PI+N M{I) (n - 1)
I\FFT X J\ SYMB
Wherein, NFFTIt is FFT (FFTs）Points； NsymbIt is the symbolic number of sub-frame of uplink； NburetIt is the data burst number of ascending wireless resource, useless subcarrier is also considered as virtual data burst； Nm(i) be allocated to i-th of user data burst serial number m (i) the subcarrier that is included of data burst and the number g of symbol.
Step 406：Calculate the useful signal receiving power P of n-th frames(n).As previously described ' Ps,m(i) represent distribute to i-th of user data burst serial number m (i) data burst on useful signal receiving power.Then useful signal receiving power Ps(n) it can be tried to achieve with following equation：
1
Ps(^ = N χ Ν ∑Nm(l){n),PSMl)N) wherein, if being defined as adjustment parameter of the base station to the power of i-th of user,
υ") = 0 (ι+Δ;)
Step 408：Calculate the total received power P of η framest。t(n).It will be understood by those of skill in the art that the total received power of n-th frame can be expressed as interference and the noise Rx power sum of the useful signal receiving power and n-th frame of n-th frame, i.e.
Ptot(n) = Ps{n) + PI+N{n)
As it was previously stated, having obtained interference and noise Rx power and of n-th frame respectively in step 402 and step 404nThe useful signal receiving power of frame, then the total received power of n-th frame can use following equation to represent：
Pl0, (") = Λ. 1 M ∑Nm0) (n) x PSMl) (") + ∑Nm( ("— 1) x P1+NMi)(n 1) step 410：According to the corresponding relation between the total received power of present frame and AGC gain value, the AGC gain value in the automatic gain control equipment of the present invention is drawn out., can also be using all uplink noise powers based on present frame as described in above-mentioned Fig. 2 or linear calibration's mode of receiving power it is pointed out that the corresponding relation can be formula or test data.If determining AGC gain using look-up table, the structure of similar following table can be used：
Above, the embodiment of the present invention is described with reference to the accompanying drawings.But, those skilled in the art to the embodiment of the present invention it is understood that without departing from the spirit and scope of the present invention, can also make various changes and replacement.These changes and replacement all fall in claims of the present invention limited range.
Claims (1)
- ClaimA kind of automatic gain control equipments for being used to control automatic gain in ofdma communication system of 1, it is characterised in that the automatic gain control equipment includes：Automatic gain controller, for receiving the analog signal from radio-frequency head and carrying out Gain tuning to the analog signal；Analog-digital converter, for the signal of the output end of the automatic gain controller to be converted into data signal；AndBaseband processing module, it includes：Carrier-in-interference noise is than measuring unit, for receiving the data signal through Digital Down Convert and measuring the carrier-in-interference noise ratio on the data burst of each up-link frame by frame；Receiving power measuring unit, for receiving the data signal through Digital Down Convert and measuring the receiving power on the data burst of each up-link frame by frame；The receiving power estimation block of present frame, the receiving power for estimating present frame according to the carrier-in-interference noise ratio and the receiving power.2. automatic gain control equipment as claimed in claim 1, it is characterised in that the baseband processing module also includes wireless resource allocation unit, for producing power control information and sending it to the receiving power estimation block of the present frame.3. automatic gain control equipment as claimed in claim 1, it is characterized in that, the baseband processing module can also include AGC gain calculator, and AGC gain value is obtained for the corresponding relation between the receiving power and AGC gain value of the present frame according to the estimation.4. automatic gain control equipment as claimed in claim 3, it is characterised in that acquired AGC gain value feeds back to the automatic gain controller.5. a kind of auto gain control method for being used to control automatic gain in ofdma communication system, it is characterised in that the auto gain control method uses following step：The carrier-in-interference noise ratio on the data burst of each up-link is measured frame by frame；The receiving power on the data burst of each up-link is measured frame by frame；Calculate the interference noise power on the data burst for the data burst serial number m (i) that (n-1) frame distributes to i-th user；Obtain the interference noise receiving power and useful signal receiving power of n-th frame； The interference noise receiving power is added with the useful signal receiving power, the total received power of the n-th frame is drawn；AndAccording to the corresponding relation between the total received power of the n-th frame and AGC gain value, the digital AGC gain value needed for obtaining.6. control method as claimed in claim 5, it is characterised in that using the wireless resource allocation unit in baseband processing module, produces power control information and sends it to the receiving power estimation block of the present frame.7. control method as claimed in claim 5, it is characterised in that using the AGC gain calculators in baseband processing module, corresponding relation between receiving power and AGC gain value based on present frame obtains AGC yield values.8. control method as claimed in claim 7 is characterized in that the corresponding relation between the receiving power of the present frame and AGC yield values can show as formula form, either form or experimental data homologous thread etc..9. control method as claimed in claim 5, the total received power for obtaining the n-th frame is realized by the receiving power estimation block of present frame.10. the baseband processing module in a kind of automatic gain control equipment for ofdma communication system, it is characterized in that, the baseband processing module has the receiving power estimation block of present frame, and the estimation block calculates the receiving power of present frame using following equation：1 1P,。, (") = τ; ~~ 7—∑ Nm 0 (") x PS i) {n) + - ~~ --∑ Nm(l) (" - 1) x P1+NMl) (" - 1)I FFr x i symb m( )=1 j FFT x j symb m(i)=1Wherein, NFFTIt is FFT points； NsymbIt is the symbolic number of sub-frame of uplink； Nbl StIt is the data burst number of ascending wireless resource； Nm(i) be allocated to i-th of user data burst serial number m (i) the subcarrier that is included of data burst and the number of symbol； Ps,m(i) represent distribute to i-th of user data burst serial number m (i) data burst on useful signal receiving power； Pl+N,m(i) represent distribute to i-th user data burst serial number m (i) data burst on interference and noise power；And Pt。t(n) total received power of n-th frame is represented.11. baseband processing module as claimed in claim 10, it is characterised in that the receiving power P of the useful signal on the data burst of the data burst serial number m (i) for distributing to i-th of users,m(i) obtained using following equatioies：^ ") = (,) x (l + A, )Wherein, P o are that the n-th frame is assigned with the useful receiving power of the user of data burst previously；Δ is base The adjustment parameter stood to the power of i-th of user.12. a kind of receiver in ofdma communication system, it has baseband processing module as claimed in claim 10.
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| PCT/CN2008/000145 WO2009092177A1 (en) | 2008-01-21 | 2008-01-21 | An apparatus and method for realizing automatic gain control in orthogonal frequency division multiple access system |
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| KR100715912B1 (en) * | 2004-08-10 | 2007-05-08 | 삼성전자주식회사 | Apparatus and method for controlling digital agc in ofdma communication system |
| KR101002872B1 (en) * | 2005-02-07 | 2010-12-21 | 삼성전자주식회사 | Apparatus and method of automatic gain control in an orthogonal frequency division multiple access system |
| CN100521672C (en) * | 2005-05-25 | 2009-07-29 | 北京北方烽火科技有限公司 | Automatic gain control device in use for multicarrier receiver |
| US7701371B2 (en) * | 2006-04-04 | 2010-04-20 | Qualcomm Incorporated | Digital gain computation for automatic gain control |
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|---|---|---|---|---|
| WO2019179412A1 (en) * | 2018-03-19 | 2019-09-26 | 电信科学技术研究院有限公司 | Noise power acquisition method and terminal |
| US11115940B2 (en) | 2018-03-19 | 2021-09-07 | Datang Mobile Communications Equipment Co., Ltd. | Method for obtaining noise power and terminal |
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| WO2009092177A1 (en) | 2009-07-30 |
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