CN101577591A - Method and device for detecting transmitting power - Google Patents
Method and device for detecting transmitting power Download PDFInfo
- Publication number
- CN101577591A CN101577591A CNA2008101057849A CN200810105784A CN101577591A CN 101577591 A CN101577591 A CN 101577591A CN A2008101057849 A CNA2008101057849 A CN A2008101057849A CN 200810105784 A CN200810105784 A CN 200810105784A CN 101577591 A CN101577591 A CN 101577591A
- Authority
- CN
- China
- Prior art keywords
- power
- pilot frequency
- base station
- time slot
- sampling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a method and a device for detecting transmitting power. The method comprises the following steps: choosing m subframes as the subframes to be detected, wherein the m is an integer larger than one; performing power sampling of n points in sequence on downlink pilot time slots of the subframes to be detected, wherein the n is a positive integer, and the sampling point of the next downlink pilot time slot has time migration Delta T corresponding to the sampling point of the previous downlink pilot time slot; averaging the power sampling result of the n*m power sampling points to obtain the average power of a downlink pilot signal and confirming the transmitting power by the average power of the downlink pilot signal. The invention also discloses a power detecting device. The application of the technical scheme of the invention can enhance the accuracy of power detection, eliminates the influence on power detection value by different code letters and by time delay of a radio-frequency channel and saves resources.
Description
Technical field
The present invention relates to wireless communication technology field, particularly the present invention relates to the transmitting power detection range.
Background technology
3-G (Generation Three mobile communication system) has extensively adopted CDMA (Code Division MultipleAccess, code division multiple access inserts) be the access way on basis, CDMA compares with traditional narrow band communication has wideer spectral bandwidth, less transmitting power, correspondingly its chip (chip) speed also is higher usually.TD-SCDMA (Time Division-Synchronization CodeDivision Multiple Access, TD SDMA inserts) except possessing the feature of general cdma communication, also has its distinctive time-division characteristic.Each wireless frame length 10ms in the TD-SCDMA physical channel, each radio frames is divided into the subframe of two 5ms, and each subframe is made up of 7 conventional time slots and 3 special time slots of length 675us.3 special time slots are respectively descending pilot frequency time slot, upstream and downstream pilot time slot and protection time slot.Have only descending pilot frequency under various states, all to exist in all descending time slots of TD-SCDMA and power is more stable.There is corresponding relation in total transmitting power of the power of descending pilot frequency and the power of other time slots, base station, therefore, if can accurately detect the power of descending pilot frequency, just can determine the power of other time slots, total transmitting power of base station.
In 3GPP (Third Generation Partnership Project, third generation partner program) the 25.142TD-SCDMA base station uniformity test standard, be to the relevant regulations of base station peak power output:
Generally, the base station peak power output will be within nominal power output PRAT ± 2dB of manufacturer;
Under the extreme case, within nominal power output PRAT ± 2.5dB of base station peak power output straw cord for bundling up rice or wheat stalks manufacturer;
Consider the uncertainty that test macro brings, generally, the base station peak power output is within PRAT ± 2.7dB;
Consider the uncertainty that test macro brings, under the extreme case, the base station peak power output is within PRAT ± 3.2dB;
Normal conditions in the above-mentioned agreement refer to environment as shown in the table:
Extreme case in the above-mentioned agreement can be carried out according to the relevant regulations in the extreme test environment in the 3GPP 25.142 TD-SCDMA base station uniformity test standards.
The transmitting power of base station is owing to the variation of ambient temperature changes in the TD-SCDMA communication system, base station transmitting power is with respect to the reduction or the rising of expection power, transmitting power is lower than the coverage that expection power too much will have influence on the base station, and transmitting power is higher than expection power too much may cause interference to other base stations.Be the excessive influence of fluctuations performance of the transmitting power of avoiding the base station, general base station all can the design power calibration system, and periodic monitor is adjusted the transmitting power of radio system, and the transmitting power that guarantees the base station is within desired extent.Because it is more stable having only descending pilot frequency existence and power, so the calibration of power can only select to detect the power of descending pilot frequency time slot.
Descending pilot frequency time slot is made up of the protection interval of 32chip and Sync_DL (Synchronize Down Link, the down-going synchronous) sign indicating number of 64chip.Have 128 cell scramblings in the TD-SCDMA system and distinguish different sub-districts, per four scramblers are formed one group, corresponding a Sync_DL sign indicating number, totally 32 groups of Sync_DL code words.When setting up the sub-district of different scrambling codes, the Sync_DL that send the base station has 32 kinds of situations.
In the signal emission process, baseband digital signal is through in the Digital IF Processing process, the Sync_DL digital baseband signal is through RRC (Root Raised Cosine, root raised cosine) waveform can change behind the forming filter, fluctuation appears in the waveform of Sync_DL on time domain that causes launching, and the fluctuation pattern of different code words is inequality.
The realization of existing TD-SCDMA calibration of power system is to obtain current power by power detecting system, and after comparing with expection power, the numerical-control attenuator of adjusting in the radio system realizes regulating gain.
The power detection that use usually present base station has following three kinds of schemes:
1, the single-point detection scheme of fast-response
Power detection hardware is shorter to the response time of input signal in this scheme, can guarantee the basic reflected signal variable power of output voltage.By ergodic actual measurement or emulation, in descending pilot frequency time slot, seek a time point, make the time domain waveform of 32 groups of Sync_DL code words all compare the average power of approaching whole descending pilot frequency at this power constantly.During power detection, the power detection result of this fixed time is carried out data acquisition by FPGA (Field Programmable Gate Array, field programmable gate array).The power of the same point by a plurality of subframe duplicate detection descending pilot frequency time slots, obtain the final power detected value after the performance number that these a plurality of subframes are detected averages then, this value promptly is considered to descending pilot frequency time slot power, and the base station uses this value to carry out the calibration of power.
2, the multiple spot detection scheme of fast-response
The difference of this scheme and the 1st scheme just is, FPGA puts a plurality of equally spaced set time of descending pilot frequency in same subframe and carries out power detection result's data acquisition continuously, the power detection value of these a plurality of points obtains the power detection value of this frame after average.The same with the 1st scheme, system is the power by a plurality of these fixing points of subframe duplicate detection equally, then the detection power of a plurality of subframes is averaged and obtain the final power detected value, and the base station uses this value to carry out the calibration of power.
3, the single-point detection scheme of slow-response
Power detection hardware is longer to the response time of input signal in this scheme, and the voltage of output is in a long time average to input signal.Digital quantity at a descending pilot frequency time slot corresponding moment power of FPGA collection in the cycle, the base station power calibration software converts and obtains performance number, power by a plurality of subframe duplicate detection descending pilot frequency time slot same points, obtain the final power detected value after the performance number that these a plurality of subframes are detected averages then, the base station uses this value to carry out the calibration of power.
There is following shortcoming in technique scheme:
The some fixing point that such scheme 1 can search out descending pilot frequency by emulation or experiment test in theory makes 32 Sync_DL code words all relatively approach the average power of descending pilot frequency at the power of this point as the power detection point.But, find that by emulation actual can only finding makes 32 Sync_DL code words all satisfy detection power to be in point in descending pilot frequency power ± 2.0dB scope, and more the point of high accuracy scope can not find, the experiment test result is similar to simulation result.Therefore this peak power accuracy of detection that has just limited this scheme can not surpass ± 2.0dB.And the delay requirement of 1 pair of transmission channel of scheme is relatively stricter, if the time delay of real base station transmission channel and simulated conditions are variant, the result who obtains so will be poorer.
Such scheme 2 considers that the time domain waveform existence of descending pilot frequency time slot fluctuates, so choosing a plurality of sampled points continuously averages and obtains sampled result one time, promptly the power detection value of a frame is taked to carry out the calibration of power as the average power of whole descending pilot frequency time slot after the multiple averaging.But owing to be subjected to the restriction of FPGA data processing time delay, this detection is counted usually all seldom, and 4 to 5 test points generally can only be arranged.Therefore this multiple spot detection scheme still can not obtain enough power detection precision, and if these points all be taken at just the power higher point or than low spot also might cause the power detection result than mistake.Same this scheme is very strict to the delay requirement of transmission channel, if the time delay of different base station transmission channel is variant slightly, just may there be very big-difference in testing result.
Such scheme 3 needs to adjust response time to one desired value of power detection hardware to signal, make its output level section can the reflected signal average power sometime, power detects in this time period then, and this method need be carried out debugging single board to hardware and be found the suitable response time.This scheme can be brought than mistake because of the device inconsistency, nor the descending pilot frequency time slot that can eliminate different Sync_DL code words above-mentioned fully fluctuate acutely bring than mistake.
Summary of the invention
The present invention proposes a kind of detection method and device of transmitting power, and purpose is intended to one of solve the aforementioned problems in the prior at least.
In order to arrive above-mentioned purpose, the invention discloses a kind of detection method of transmitting power, descending pilot frequency time slot is carried out multi-point sampling, the mean value of feasible each the sampled point power that is obtained approaches the average power of whole descending pilot frequency time slot.This method may further comprise the steps: select m subframe as subframe to be detected, described m is the integer greater than 1; Descending pilot frequency time slot to described subframe to be detected carries out n point power samples successively, and described n is a positive integer, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points; The power samples result that said n * m power samples point obtained averages, and obtains the average power of down-bound pilot frequency signal, determines transmitting power by the average power of described down-bound pilot frequency signal.
As the embodiment of said method, first descending pilot frequency time slot of described subframe to be detected is carried out the power samples that the n point equates at interval.
In the above-described embodiments, described m, n and Δ T satisfy following relationship: n * (m * Δ T)≤shared time of descending pilot frequency time slot.
As the embodiment of said method, described time migration Δ T depends on the device parameters of base station digital intermediate frequency forming filter.
As the embodiment of said method, determine that described time migration Δ T may further comprise the steps: the interpolation multiple of determining base station digital intermediate frequency RRC forming filter; Determine required power detection precision, the sampling interval is determined in emulation by experiment, make the average power of each sampled point of under the described sampling interval, obtaining, undistorted with respect to actual power through the described down-bound pilot frequency signal of described base station digital intermediate frequency RRC forming filter filtering; With described time migration Δ T value is the described sampling interval.
In the above-described embodiments, the interpolation multiple of described base station digital intermediate frequency RRC forming filter is 60.
In the above-described embodiments, described required power detection precision is not more than 0.015dB for detecting error.
In the above-described embodiments, the described sampling interval is 1/8chip or 1/4chip.
As the embodiment of said method, described n depends on the response time of sampling processor deal with data in the base station.
As the embodiment of said method, described n point sampling may further comprise the steps: the response time of determining sampling processor deal with data in the base station; Determine the effective detection time in the descending pilot frequency time slot; Carry out the n point sampling in effective detection time in a described descending pilot frequency time slot, the sampling interval is not less than the response time of sampling processor deal with data in the described base station.
In the above-described embodiments, a described descending pilot frequency time slot does not comprise 4 chip when descending pilot frequency time slot begins and finishes preceding back 4 chip interior effective detection time.
The invention also discloses a kind of base station self adaptation and adjust the method for transmitting power, may further comprise the steps: select m subframe as subframe to be detected, described m is the integer greater than 1; N point power samples is carried out to the descending pilot frequency time slot of described subframe to be detected successively in the base station, and described n is a positive integer, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points; Described base station averages the power samples result of described n * m power samples point, obtains the average power of down-bound pilot frequency signal, determines the transmitting power of described base station by the average power of described down-bound pilot frequency signal; Described base station is carried out the self adaptation adjustment according to the average power of the described down-bound pilot frequency signal that obtains to the transmitting power of described base station.
The invention also discloses a kind of emission power detecting, comprise being provided with and preserve module, sampling module and computing module: the described preservation module that is provided with, the power samples that is used to preserve number m as subframe to be detected, each descending pilot frequency time slot is counted n, the initial moment of sampling and embody the time migration Δ T of power detection precision, wherein, described m is the integer greater than 1, and described n is a positive integer; Described sampling module is used for successively the descending pilot frequency time slot of described subframe to be detected is carried out n point power samples, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points; Described computing module, the power samples result who is used for described sampling module is obtained described n * m sampled point averages, and obtains the average power of described down-bound pilot frequency signal, determines the transmitting power of described base station by the average power of described down-bound pilot frequency signal.
Embodiment as said apparatus, also comprise emulation module, described time migration Δ T obtains by emulation module emulation, described emulation module is according to the interpolation multiple of base station digital intermediate frequency RRC forming filter and required power detection precision, the sampling interval is determined in emulation by experiment, make the average power of each sampled point of under the described sampling interval, obtaining, undistorted with respect to actual power through the described down-bound pilot frequency signal of described base station digital intermediate frequency RRC forming filter filtering.
As the embodiment of said apparatus, the described setting is provided with the number that the time of carrying out power detection is specially power samples point sum or detects descending pilot frequency time slot in the preservation module.
As the embodiment of said apparatus, described sampling module is FPGA, and described n was determined by the response time of described FPGA deal with data.
The advantage that technical scheme of the present invention possesses is:
(1) precision height
Utilize technical scheme of the present invention, by the repeatedly experiment at many stylobates station, the actual power worst error that base station power detected value after the calibration of power and frequency spectrograph measure is less than 0.5dB.
(2) eliminated of the influence of different Sync_DL code words to the power detection value
Experiment test shows that the power detection error of 32 different Sync_DL code words is in 0.38dB.
(3) eliminated of the influence of the time delay of radio-frequency channel to the power detection value
Experiment test shows, for same Sync_DL codewords among cells, the measured rate of different radio frequency channel time delay is set detects error in 0.39dB.
(4) save resource
Though technical scheme of the present invention is carried out the multiple spot power detection of high sampling precision, but by emulation experiment obtain suitable power samples at interval after, can be sufficiently high in advance down in the guaranteed output accuracy of detection, save storage to greatest extent and handle resource.
Description of drawings
Fig. 1 detects the implementation schematic diagram for base station power of the present invention;
Fig. 2 carries out the power detection embodiment schematic diagram of two point samplings for each subframe of the present invention;
Fig. 3 is the present invention power detection simulation result figure in different sampling intervals;
Fig. 4 is power detection error simulation result figure under the different sampling intervals of the present invention;
Fig. 5 carries out the power detection embodiment schematic diagram of four point samplings for each subframe of the present invention;
Fig. 6 is the actual test of a present invention schematic diagram;
Fig. 7 is an emission power detecting schematic diagram of the present invention.
Embodiment
The present invention mainly proposes a kind of detection method and device of transmitting power, descending pilot frequency time slot to m subframe carries out the n point sampling successively, and the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points; So just the mean value of feasible n * m the power samples point performance number that is obtained is in close proximity to the average power content of whole descending pilot frequency time slot, thereby can more accurately detect transmitting power.The present invention can be used for the transmitting power of base station is detected, and obtains more accurate testing result, makes the base station more effective to the adjustment of self transmitting power.Certainly the detection method of the present invention's proposition not only can be used for the detection to the base station; also may be used on the detection of other wireless device transmitting powers, therefore any to special use of the present invention or change and all should be protection range of the present invention and contain based on those skilled in the art's knowledge.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail: as shown in Figure 1, the base station power that adopts for the present invention detects the implementation schematic diagram, wherein, send into power detector after power coupler coupling transmitter module transmits, power detector is the wave detector of RMS (root-mean-square, root mean square) detection mode, input rf signal output analog voltage, power is corresponding according to certain relation with voltage.The voltage of power detector output is changed to digital quantity by AD, by sampling processor, as equipment such as MCU or FPGA, at a time or some constantly the numeric results of power detection is gathered, and send to the corresponding software module and do subsequent treatment.
The detection implementation method that the present invention proposes may further comprise the steps: select m subframe as subframe to be detected, described m is the integer greater than 1; Descending pilot frequency time slot to described subframe to be detected carries out n point power samples successively, and described n is a positive integer, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points; The power samples result that said n * m power samples point obtained averages, and obtains the average power of down-bound pilot frequency signal, determines transmitting power by the average power of described down-bound pilot frequency signal.
As embodiments of the invention, apply the present invention in the detection of TD-SCDMA base station transmitting power.By explanation, so that intension of the present invention is further elaborated to specific embodiment.
The descending pilot frequency time slot that the TD-SCDMA base station issues is made of 64 chip.Obviously, the descending pilot frequency time slot among the present invention can be whole descending pilot frequency time slot, also can be the part-time section of descending pilot frequency time slot.Power when considering the descending pilot frequency starting and ending may be stablized inadequately, preferably, in the present embodiment, power detection point only is included in descending pilot frequency in the descending pilot frequency time slot and begins behind 4 chip time span between 4 chip before finish, 56chip altogether.
Method having thus described the invention, n * m power samples point is at the power samples point that the transmitting power of base station is carried out once required collection in the complete test.Obviously, total number of sample points n * m and sampling interval, just sampling precision has embodied different power detection requirements.
Based on those skilled in the art's general knowledge, can make various adjustment to the value of m, n, the variation of above-mentioned various parameters all should be protection range of the present invention and contains.Below by embodiment the implication of described parameter is further elaborated.
As shown in Figure 2, as embodiments of the invention, for the every subframe of the present invention detects 2 power detection embodiment schematic diagram.In Fig. 2, demonstration be the time domain waveform of the descending pilot frequency of a subframe, for the signal purpose, each sampled point is illustrated among the figure.Between the detection starting point and detection terminating point of first descending pilot frequency time slot, carry out power samples a1, b1 twice, sampling instant for the first time is the moment that begins effective detection time, after 1/2nd effective detection times, carries out the sampling second time.Described two sampled points are effective detection time of the five equilibrium in first descending pilot frequency time slot, and the descending pilot frequency time slot of subframe to be detected is carried out point-to-point transmission every the power samples that equates.Wherein, a2, b2 are illustrated as 2 sampled points in the next subframe, and in like manner, am, bm are illustrated as 2 sampled points in m the subframe.In the present embodiment, the sampled point of a back descending pilot frequency time slot has time migration Δ T with respect to first descending pilot frequency time slot corresponding sampling points; The size of time migration Δ T can be set according to the requirement of sampling precision, only needs the time between assurance n * (m * Δ T)≤detection starting point and the detection terminating point.In the present embodiment, the n value is 2.Obviously, determining under the condition of total number of sample points and every subframe sampling number that promptly under the situation that m, n have determined, sampling precision is more little, the scope of the descending pilot frequency time slot that is detected is also more little.Obviously, based on those skilled in the art's general knowledge, the sampling of the effective detection time in the described descending pilot frequency time slot is not limited to five equilibrium uniform sampling form, can makes various adjustment to sample mode, described variation should be protection range of the present invention and contains.
Time migration Δ T reflects sampling precision; general knowledge based on those skilled in the art; can make various adjustment to the value of time migration Δ T; for example; time migration Δ T can be offset forward or skew backward with respect to reference point; the size of side-play amount also can be done suitable adjustment, only needs each sampled point of assurance to drop within effective detection time and gets final product, and described variation should be protection range of the present invention and contains.Provide the preferred implementation of a kind of definite time migration Δ T below by specific embodiment, the implication to m, n also is further elaborated simultaneously.
In the present embodiment, the digital intermediate frequency RRC forming filter interpolation multiple of tested base station is 60.The interpolation multiple that the digital intermediate frequency RRC forming filter of tested base station adopts is 60 times, and just a chip has become 60 symbols.Therefore the average power of each the sampled point RMS power that obtains with the 1/60chip sampling precision can be considered as the average power of whole descending pilot frequency.Though can satisfy the requirement of power detection precision fully with the sampling interval of 1/60chip, but the sampling interval with 1/60chip samples, in effective detection time of a descending pilot frequency time slot, for example, power detection point only is included in descending pilot frequency in the descending pilot frequency time slot and begins behind 4 chip time span between 4 chip before finish, 56chip altogether, then a descending pilot frequency time slot sampled point is 60 * 56, if desired m descending pilot frequency time slot detected, total sampled point is 60 * 56 * m, no matter it is the testing time, storage still is the data processing resource, consumes all very huge.
Preferably, present embodiment solves the contradiction of above-mentioned sampled point and sampling precision in the following manner: emulation by experiment, various sampling precisions are compared, and therefrom select the suitable sampling interval, satisfying under the condition of sampling precision, reduce sampling number.
As shown in Figure 3, be the present invention power detection simulation result figure in different sampling intervals; As shown in Figure 4, be power detection error simulation result figure under the different sampling intervals of the present invention.Descending pilot frequency time slot to 32 Sync_DL code words in the TD-SCDMA system carries out power detection emulation, can obtain the result by emulation experiment is, 1/8chip and 1/4chip sampling precision result are all very approaching with the sampling precision result of 1/60chip, and the above two and the latter's error is all less than 0.015dB; The sampling precision result of 1/2chip sampling precision result and 1/60chip has apparent in view error, and error is near 0.1dB; And the sampling precision resultant error of 1chip sampling precision result and 1/60chip is very big, and error is near 1dB.
Preferably, in the present embodiment, desired power detection precision is not more than 0.015dB for the power detection error, according to above-mentioned experiment simulation analysis, sampling precision is preferably 1/4chip.Therefore, in the effective detection time in a descending pilot frequency time slot, just in a descending pilot frequency time slot time span of the initial back of descending pilot frequency 4chip 4chip before finish, altogether in the 56chip, the sampling number that needs is 56 * 4=224.
As a specific embodiment of the present invention, the sampling processor of inside of base station is FPGA.In the present embodiment, the FPGA of inside of base station can not be lower than 8.5us to the data processing response time, promptly FPGA handle the interval of two secondary data can not be less than 8.5us.Each chip is 0.78125us and whole sampling length is 56 * 0.78125=43.75us, therefore obviously can not finish in a subframe 56 * 4 sampling.Because the different subframes of descending pilot frequency waveform in the one-period calibration cycle are highly stable, therefore can consider to realize in the following ways: in a subframe, carry out the sampling of n=4 point, the time interval of these 4 points is 10.9375us, detects the performance number of these 4 points; Next frame by FPGA with these 4 test points all backward translation 1/4chip detect again, by that analogy, up to finishing needed power detection at 56 * 4.By above-mentioned 56 * 4 power samples, with the performance number of above-mentioned 56 * 4 sampled points average after, promptly can be as the average power of whole descending pilot frequency.
As shown in Figure 5, detect 4 power detection embodiment schematic diagram for the every subframe of the present invention.As a specific embodiment of the present invention, continuous m descending pilot frequency time slot selecting the down-bound pilot frequency signal that the base station issues carries out power detection, promptly a continuous m descending sub frame detected every frame sampling n point, m=56 wherein, n=4.Obviously, also can select discrete a plurality of subframe to detect.In Fig. 5, what show is the time domain waveform of the descending pilot frequency of a subframe, a1, b1, c1, d1 are illustrated as 4 sampled points of the interval 10.9375us in first subframe, a2, b2, c2, d2 are illustrated as 4 sampled points of second interval 10.9375us in the subframe, in like manner, am, bm, cm, dm are illustrated as 4 sampled points of m the interval 10.9375us in the subframe.
Can calculate and finish one time the required time of power detection.For example, carry out taking turns sampling in the descending pilot frequency time slot if base station power detects with each frame 10ms, then 224 power detection times are 10 * 224/4=560ms.Usually the period regulation time of TD-SCDMA base station generally all is to carry out once tens of at least seconds.Therefore, this detection speed can satisfy the requirement of base station period regulation fully.
As shown in Figure 6, be the actual test of the present invention schematic diagram.
As a specific embodiment of the present invention, use the little base station of rated power in the test as 2W, set up the full power sub-district, the power of descending pilot frequency, the power of the power of PCCPCH channel and TS4, TS5, TS6 downlink business time slot all is configured to 33dBm, through behind the period regulation repeatedly, use frequency spectrograph to measure the RMS power of TS4 time slot at the antenna for base station mouth.
Following table is the power detection data of two kinds of different detection schemes to the TS4 time slot, and power unit is dBm.Wherein existing scheme is the multiple spot detection scheme of the fast-response introduced in the background technology, is specially the fast-response detection scheme that adopts 4 detections.
Testing result is compared, can obtain to draw a conclusion, the testing result of existing scheme show the maximum positive negative sense error of power output be 1.701dB and-0.982dB, detect with technical scheme of the present invention, the maximum positive negative sense error of power output be 0.083dB and-0.261dB.Obviously, the power control precision of technical scheme of the present invention obviously is better than existing scheme.
The invention allows for a kind of base station self adaptation and adjust the method for transmitting power, may further comprise the steps: step 1, a base station selected m subframe is as subframe to be detected, and wherein m is at least 2; Step 2, base station are carried out n point power samples to the descending pilot frequency time slot of subframe to be detected successively, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points; Step 3, the base station averages the power samples result of n * m power samples point, obtains the average power of down-bound pilot frequency signal, determines the transmitting power of base station by the average power of down-bound pilot frequency signal; Step 4, the base station is carried out the self adaptation adjustment according to the average power of the down-bound pilot frequency signal that obtains to the transmitting power of base station self.
As embodiments of the invention, apply the present invention to the TD-SCDMA base station.The TD-SCDMA base station is more stable owing to having only descending pilot frequency existence and power, therefore in the calibration of power, utilize the present invention, can detect the power of descending pilot frequency time slot accurately, can calculate the transmitting power of base station from the average power of pilot signal, and, guarantee that transmitting power meets the requirement of rated power with this adjustment of making transmitting power.
As shown in Figure 7, be emission power detecting schematic diagram of the present invention, this emission power detecting comprises being provided with preserves module 11, sampling module 12 and computing module 13: be provided with and preserve power samples that module 11 is used to preserve number m as subframe to be detected, each descending pilot frequency time slot and count n, the initial moment of sampling and embody the time migration Δ T of power detection precision; Sampling module 12 is used for successively the descending pilot frequency time slot of subframe to be detected is carried out n point power samples, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points; The performance number that computing module 13 is used for sampled point that sampling module is obtained averages, and obtains the average power of down-bound pilot frequency signal thus.
An embodiment as said apparatus, wherein also comprise emulation module 14, time migration Δ T obtains by emulation module emulation, emulation module is according to the interpolation multiple of base station digital intermediate frequency RRC forming filter and required power detection precision, the sampling interval is determined in emulation by experiment, make that the average power of each sampled point of obtaining under the sampling interval is undistorted with respect to the actual power of described down-bound pilot frequency signal, wherein, time migration Δ T value is the sampling interval.
As an embodiment of said apparatus, be provided with the number that the time of carrying out power detection is specially power samples point sum or detects descending pilot frequency time slot is set in the preservation module 11.For example, be provided with and preserve detection m the pilot signal time slot of setting in the module, with this understanding, sampling module will carry out power detection to m descending pilot frequency time slot, each descending pilot frequency time slot carries out the power samples that n is ordered, time migration Δ T between the corresponding sampled point in each sampled point in the n point power samples of a wherein back descending pilot frequency time slot and the n point power samples of previous descending pilot frequency time slot is provided by emulation module, makes that the average power of each sampled point of obtaining is undistorted with respect to the actual power of described down-bound pilot frequency signal.
As an embodiment of said apparatus, sampling module 12 is FPGA, and the power samples of each descending pilot frequency time slot n that counts was determined by response time of FPGA deal with data.Obviously, sampling module 12 also can be other sample devicess such as MCU.
The application of technical scheme of the present invention has one of following at least advantage.At first, power detection precision height shows that by the experiment at many stylobates station repeatedly the actual power worst error that base station power detected value after the calibration of power and frequency spectrograph measure is less than 0.5dB.Simultaneously, technical scheme of the present invention has been eliminated the influence of different Sync_DL code words to the pilot signal power detected value, and experiment test shows that the power detection error of 32 different Sync_DL code words is in 0.38dB.And technical scheme of the present invention has been eliminated the influence of the time delay of radio-frequency channel to the power detection value, and experiment test shows, for same Sync_DL codewords among cells, the measured power detection error of different radio frequency channel time delay is set in 0.39dB.At last, technical scheme of the present invention can make full use of existing resource when improving accuracy of detection, by emulation obtain suitable power samples at interval after, under the sufficiently high prerequisite of guaranteed output accuracy of detection, save storage to greatest extent and handle resource.
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 make some improvements and modifications to the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1, a kind of detection method of transmitting power is characterized in that, may further comprise the steps:
Select m subframe as subframe to be detected, described m is the integer greater than 1;
Descending pilot frequency time slot to described subframe to be detected carries out n point power samples successively, and described n is a positive integer, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points;
The power samples result that said n * m power samples point obtained averages, and obtains the average power of down-bound pilot frequency signal, determines transmitting power by the average power of described down-bound pilot frequency signal.
2, the detection method of transmitting power as claimed in claim 1 is characterized in that, first descending pilot frequency time slot of described subframe to be detected is carried out the power samples that the n point equates at interval.
3, the detection method of transmitting power as claimed in claim 2 is characterized in that, described m, n and Δ T satisfy following relationship: n * (m * Δ T)≤shared time of descending pilot frequency time slot.
4, the detection method of transmitting power as claimed in claim 1 or 2 is characterized in that, described time migration Δ T depends on the device parameters of base station digital intermediate frequency forming filter.
5, the detection method of transmitting power as claimed in claim 1 or 2 is characterized in that, determines that described time migration Δ T may further comprise the steps:
Determine the interpolation multiple of base station digital intermediate frequency root raised cosine RRC forming filter;
Determine required power detection precision, the sampling interval is determined in emulation by experiment, make the average power of each sampled point of under the described sampling interval, obtaining, undistorted with respect to actual power through the described down-bound pilot frequency signal of described base station digital intermediate frequency RRC forming filter filtering;
With described time migration Δ T value is the described sampling interval.
6, the detection method of transmitting power as claimed in claim 5 is characterized in that, the interpolation multiple of described base station digital intermediate frequency RRC forming filter is 60.
7, the detection method of transmitting power as claimed in claim 6 is characterized in that, described required power detection precision is not more than 0.015dB for detecting error.
8, the detection method of transmitting power as claimed in claim 7 is characterized in that, the described sampling interval is 1/8 chip chip or 1/4chip.
9, the detection implementation method of base station transmitting power as claimed in claim 1 is characterized in that, described n depends on the response time of sampling processor deal with data in the base station.
10, the detection method of transmitting power as claimed in claim 1 is characterized in that, described n point sampling may further comprise the steps:
Determine the response time of sampling processor deal with data in the base station;
Determine the effective detection time in the descending pilot frequency time slot;
Carry out the n point sampling in effective detection time in a described descending pilot frequency time slot, the sampling interval is not less than the response time of sampling processor deal with data in the described base station.
11, the detection method of transmitting power as claimed in claim 10 is characterized in that, does not comprise 4 chip when descending pilot frequency time slot begins the effective detection time in the described descending pilot frequency time slot and finishes preceding back 4 chip.
12, a kind of method of base station self adaptation adjustment transmitting power is characterized in that, may further comprise the steps:
Select m subframe as subframe to be detected, described m is the integer greater than 1;
N point power samples is carried out to the descending pilot frequency time slot of described subframe to be detected successively in the base station, and described n is a positive integer, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points;
Described base station averages the power samples result of described n * m power samples point, obtains the average power of down-bound pilot frequency signal, determines the transmitting power of described base station by the average power of described down-bound pilot frequency signal;
Described base station is carried out the self adaptation adjustment according to the average power of the described down-bound pilot frequency signal that obtains to the transmitting power of described base station.
13, a kind of emission power detecting is characterized in that, comprises being provided with preserving module, sampling module and computing module:
The described preservation module that is provided with, the power samples that is used to preserve number m as subframe to be detected, each descending pilot frequency time slot is counted n, the initial moment of sampling and embody the time migration Δ T of power detection precision, wherein, described m is the integer greater than 1, and described n is a positive integer;
Described sampling module is used for successively the descending pilot frequency time slot of described subframe to be detected is carried out n point power samples, and wherein, the sampled point of back one descending pilot time slot has time migration Δ T with respect to last descending pilot frequency time slot corresponding sampling points;
Described computing module, the power samples result who is used for described sampling module is obtained described n * m sampled point averages, and obtains the average power of described down-bound pilot frequency signal, determines the transmitting power of described base station by the average power of described down-bound pilot frequency signal.
14, emission power detecting as claimed in claim 13, it is characterized in that, also comprise emulation module, described time migration Δ T obtains by emulation module emulation, described emulation module is according to the interpolation multiple of base station digital intermediate frequency RRC forming filter and required power detection precision, the sampling interval is determined in emulation by experiment, make the average power of each sampled point of under the described sampling interval, obtaining, undistorted with respect to actual power through the described down-bound pilot frequency signal of described base station digital intermediate frequency RRC forming filter filtering.
15, emission power detecting as claimed in claim 13 is characterized in that, the described setting is provided with the number that the time of carrying out power detection is specially power samples point sum or detects descending pilot frequency time slot in the preservation module.
16, emission power detecting as claimed in claim 13 is characterized in that, described sampling module is an on-site programmable gate array FPGA, and described n was determined by the response time of described FPGA deal with data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810105784A CN101577591B (en) | 2008-05-05 | 2008-05-05 | Method and device for detecting transmitting power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810105784A CN101577591B (en) | 2008-05-05 | 2008-05-05 | Method and device for detecting transmitting power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101577591A true CN101577591A (en) | 2009-11-11 |
| CN101577591B CN101577591B (en) | 2012-09-05 |
Family
ID=41272393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810105784A Active CN101577591B (en) | 2008-05-05 | 2008-05-05 | Method and device for detecting transmitting power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101577591B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391140A (en) * | 2013-07-19 | 2013-11-13 | 京信通信系统（中国）有限公司 | Method and system for detecting power of CDMA (code-division multiple access) 2,000 and EVDO (evolution-data optimized) mixed signals |
| CN116744424A (en) * | 2023-08-11 | 2023-09-12 | 深圳国人无线通信有限公司 | Base station power threshold alarming method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933781A (en) * | 1997-01-31 | 1999-08-03 | Qualcomm Incorporated | Pilot based, reversed channel power control |
-
2008
- 2008-05-05 CN CN200810105784A patent/CN101577591B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391140A (en) * | 2013-07-19 | 2013-11-13 | 京信通信系统（中国）有限公司 | Method and system for detecting power of CDMA (code-division multiple access) 2,000 and EVDO (evolution-data optimized) mixed signals |
| CN103391140B (en) * | 2013-07-19 | 2015-10-14 | 京信通信系统（中国）有限公司 | The power detecting method of CDMA2000 and EVDO mixed signal and system |
| CN116744424A (en) * | 2023-08-11 | 2023-09-12 | 深圳国人无线通信有限公司 | Base station power threshold alarming method and device |
| CN116744424B (en) * | 2023-08-11 | 2023-11-10 | 深圳国人无线通信有限公司 | Base station power threshold alarming method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101577591B (en) | 2012-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5861301B2 (en) | Wireless communication terminal and automatic gain control method | |
| CN100474799C (en) | Outer loop transmit power control using channel-adaptive processing | |
| CN102065531B (en) | Power calibrating method and device | |
| CN104184527A (en) | Transmission power measuring device and transmission power measuring method | |
| CN105992330B (en) | A kind of gain adjusting method and device | |
| CN110266421A (en) | Multichannel synchronousing collection phase alignment system and method | |
| US9485040B2 (en) | Method for testing sensitivity of a data packet signal transceiver | |
| CN105307248B (en) | A kind of method and system of mobile terminal radio frequency transmission power adjustment | |
| CN104618042A (en) | System and method for realizing multi-channel signal analysis synchronization and time delay adjustment | |
| CN108988979A (en) | A kind of full frequency band frequency sweeping method, device and small base station | |
| CN103841597B (en) | Frequency point scanning method and device for TD-SCDMA system | |
| CN102027674A (en) | Technique for controlling a gain of a receiver | |
| CN100499870C (en) | Accurate access method in the case of the initial search at the cell in TD-SCDMA system | |
| CN2669492Y (en) | User device using low-power interference signal code power measurement | |
| CN105025503B (en) | A kind of standing-wave ratio detecting method and system of TD-LTE RRU | |
| CN101577591B (en) | Method and device for detecting transmitting power | |
| JP2012034369A (en) | Wireless communication terminal and automatic gain control method | |
| CN101123595B (en) | A method and system for gain calibration of digital receiver channel | |
| CN101079664B (en) | A detection method and device of base station power of TD-SCDMA system | |
| CN101170332B (en) | Marking method and device for carrier power of multi-carrier radio communication system | |
| CN104969562A (en) | Measurement apparatus and measurement method for determining an active channel | |
| CN101425854B (en) | Link calibration method and device | |
| CN102257857B (en) | Method and device for compensating power according to frequency | |
| CN101572907B (en) | Time switch template test method for TD-SCDMA terminal | |
| CN105785206A (en) | System and method for testing pass-bands of multichannel frequency converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |