CN101102121A - Full frequency band frequency point scanning method of time-division-synchronization code multi-address division system - Google Patents
Full frequency band frequency point scanning method of time-division-synchronization code multi-address division system Download PDFInfo
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Abstract
The invention is concerned with the point frequency scanning method of mobile terminal frequency segment to perform under interference environment of all sorts. It applies the low connection filtering method to eliminate the disturbance of the signal incept power volume by noise and the channel fading, directs the adjustment of the point frequency AGC and the frequency power measurement with different reference guide line separately, and conducts fitting and smoothing treatment to all the frequency section measuring volume data, and finally, generates the candidate frequency list by applying the method of power section peak value selection.
Description
Technical field
The present invention relates to realize in the mobile communication system scan method of full frequency band frequency point, realize the scan method of full frequency band frequency point in particularly a kind of Time Division-Synchronous Code Division Multiple Access wireless communication system (abbreviating the TD-SCDMA system as).Adopt full frequency band scan method of the present invention, can in low signal-to-noise ratio, strong interference environment, realize the purpose of terminal searching serving BS working frequency points in the TD-SCDMA system quickly and accurately.
Background technology
The frequency point scanning of mobile communication system terminal (abbreviating UE as) is meant that UE is after start or when losing the network coverage, UE attempts the process of the effective base station in service sector working frequency points of search in it receives band limits not having serving BS sub-district prior information or search to prestore under the situation of sub-district failure.
According to the frequency spectrum suggestion of the 3-G (Generation Three mobile communication system) of third generation collaborative project (abbreviating 3GPP as) planning, China has distributed to " time division duplex (abbreviating TDD as) " pattern with 1880～1920MHz, 2010～2025MHz and three sections asymmetric frequency spectrum resources of 2300～2400MHz.
The TD-SCDMA system is the low chip rate systems of tdd mode in 3GPP the 3rd mobile communication system, simultaneously also is the system of tool application prospect in the tdd mode.The spreading rate of this system is 1.28Mcps; each wireless sub-frame length is 5ms; i.e. 6400 chips (abbreviating chip as); wherein; each subframe can be divided into 7 conventional time slot TS0～TS6 again, and descending pilot frequency time slot (abbreviating DwPTS as), uplink pilot time slot (abbreviating UpPTS as) and a main protection (are protected and abbreviated GP at interval as) at interval.The TS0 time slot of this system is always distributed to down link, is used for bearing system broadcast channel and other possible down channel; TS1～TS6 time slot then is used to carry the uplink and downlink Traffic Channel.It is synchronous that UpPTS and DwPTS are used for setting up initial uplink and downlink respectively.The descending synchronous code (abbreviating SYNC_DL as) that comprises a 64chip in the burst structure of DwPTS, its effect are that cell ID and initial synchronisation are set up.The length of time slot TS0～TS6 is 864chip, wherein comprise the data symbol of two segment lengths for 352chip, and a middle segment length is the midamble training sequence of 144chip.This training sequence is significant in the TD-SCDMA system, and effect comprises cell ID, channel estimating and synchronous (comprising Frequency Synchronization) etc.
Clearly stipulate the channel spacing 1.6MHz of TD-SCDMA system among the standard 3GPP TR 25.945, but can adjust under special circumstances, to obtain optimal performance.The step-length of channel adjustment is 200kHz, this means that carrier frequency is necessary for the integral multiple of 200kHz.
The scan method of prior art full frequency band frequency point is one by one frequency possible in the Serving cell working frequency range scope to be carried out the measurement of received power, according to power measurement values full frequency band frequency point is carried out descending, then, carry out initial cell search (abbreviating ICS as) process at each frequency in order.Obviously, this method needs one by one all possible frequency to be carried out measurements and calculations, and workload is big, and search time is long, and frequency point scanning efficient is low and power consumption is big, very easily stays abominable use impression to the user.
For overcoming above-mentioned deficiency, the scan method of " scanning of two steps " has appearred again, and this method is earlier with 2
n* 200kHz (integer that the common value of n is 1～3) carries out power measurement for sweep spacing to all candidate's frequencies, i.e. so-called " coarse scan "; Then, in the coarse scan result, filter out the bigger frequency of power measurement values of predetermined number, to the frequency that filters out and nearest with it respectively 2
nIndividual frequency carries out power measurement once more, i.e. so-called " carefully sweeping "; At last, the power measurement values of carefully sweeping is carried out descending, carry out the ICS process at each frequency in order again.
Obviously, no matter adopt which kind of method, following several key technologies have important effect in the full frequency band frequency point scanning process:
1, the accurate measurement of frequency available signal power;
2, the automatic gain of each frequency received signal control (abbreviating AGC as) is adjusted;
3, the ordering of candidate's frequency.
Yet the prior art full frequency band frequency point scanning method is the following problem of ubiquity on above key technology:
1, the frequency power measurement values is inaccurate
Usually use following three kinds of modes to calculate the power measurement values of frequency in the prior art: 1. with chip power maximum in the data that receive continuously in a period of time as power measurement values; 2. to single frames deblocking that receives and the power measurement values of calculating each piece, with the mean value of piece maximum power in the multiframe data as power measurement values; Average power signal in one frame data that 3. will receive is as power measurement values.In fact, no matter use above which kind of mode, the intensity that all can not reflect useful signal on the frequency (signal in the system) effectively, when channel circumstance is abominable, because very noisy and strongly disturbing influence, often cause the power measurement values at correct frequency place lower, can not in measurement result, come forward position, significant prolongation the time of UE login service sub-district.
2, the adjustment mode of AGC is unreasonable
The mode that the adjustment of AGC of the prior art generally adopts each frequency independently to adjust, this mode needs a large amount of processing times at each frequency place for obtaining rational AGC yield value, and, introduced measure error during the frequency ordering because each frequency uses different AGC values.Therefore, occurred the method that each frequency adopts unified AGC value again, guaranteed all the time that by unified AGC yield value each frequency place receiver amplifier works in the linear work district.It is that the power measurement values that aforementioned manner obtains instructs the adjustment of AGC and frequency to sort as the reference index that the deficiency of this method is still to adopt.In fact, for preventing the saturation of receiver, the reference index that instructs AGC to adjust should be received signal intensity indication (abbreviating RSSI as); And the reference index that instructs frequency ordering should be an available signal power measured value accurately.
3, the ordering of candidate's frequency is unreasonable
Owing to there be inaccurate that power measurement values and AGC adjust, it obviously is irrational only the power measurement values result being carried out candidate's frequency tabulation that simple descending obtains.
Summary of the invention
For overcoming the deficiencies in the prior art, the present invention proposes a kind of under low signal-to-noise ratio, strong interference environment condition, realizes the scan method of portable terminal full frequency band frequency point quickly and accurately.The present invention adopts the mode of low-pass filtering to eliminate the interference to each frequency received signal power value of noise and channel fading, use different reference indexs to instruct adjustment and the frequency power measurement of frequency AGC respectively, and full frequency band measured value data are carried out match and smoothing processing, at last, the mode that adopts the power region peak value to select generates the tabulation of candidate's frequency.The present invention can realize realizing fast and accurately the purpose of serving BS search of working frequency points when channel circumstance is extremely abominable.
The inventive method is carried out power measurement according to predetermined frequency interval and measurement frame number to employed frequency range, obtain frequency power measurement array, and determine whether frequency power measurement array is carried out interpolation processing according to preset frequency value at interval, the frequency power data that the frequency power data match that utilization measures is measured, obtain the full frequency band power distribution curve, the full frequency band power distribution curve is carried out smoothing processing, the mode of selecting with power region peak value frequency generates the tabulation of candidate's frequency and by the descending of power measurement values size, at last, according to putting in order of candidate's frequency tabulation, enter the ICS processing procedure successively.
The inventive method is carried out power measurement according to predetermined frequency interval and measurement frame number to employed frequency range, and the step that obtains frequency power measurement array comprises:
A1, initialization AGC gain is for making receiver at all undersaturated arbitrary value of each frequency;
A2, initialization data piece rssi measurement array RSSI, piece power measurement array power, frequency power measurement array p_freq are complete 0 array; Maximum frequency RSSI value RSSI_max=0;
A3, according to the power measurement frequency in the predetermined employed frequency range of frequency interval selective sequential, wherein, preset frequency is spaced apart 2
n* 200kHz, n is the integer of span 0～2, it is the 2nd in the full frequency band frequency point that frequency is measured starting point
nIndividual;
A4, order receive frame data in candidate's power measurement frequency, it is divided into the N piece, monolithic data length L, and wherein, N, L are predetermined number, the L span is the integer of aliquot 6400 in 160～432, N=6400/L;
A5, calculate the average chip power of every blocks of data respectively, and its contraposition is superimposed among the piece rssi measurement array RSSI (being initially complete 0 array of long N);
A6, calculate each chip power of each blocks of data and the block code sheet power data of long L carried out low-pass filtering respectively, the average chip power of each blocks of data after the calculation of filtered again, and it is superimposed on piece power measurement array power (being initially complete 0 array of long N), wherein, pass band cut-off angular frequency scope is 0.05～0.2 π;
A7, repeating step A4～A6 are up to finishing predetermined fn-1 frame, and wherein, fn is 2～5 integer;
RSSI is every divided by fn for A8, piece rssi measurement array, wherein maximum of search, and the size of itself and RSSI_max relatively, and the greater composed to RSSI_max; Power is every divided by fn for piece power measurement array, search maximum wherein, and in frequency power measurement array p_freq, wherein, the length of frequency power measurement array p_freq is 2 of the interior effectively frequency sum of employed frequency range with its order assignment
-n
A9, INIT block rssi measurement array RSSI, piece power measurement array power are complete 0 array;
A10, order enter next frequency, and repeating step A4～A9 is until all frequencies of completing steps A3 selection;
A11, the reference index that adopts the maximum RSSI_max of the piecemeal rssi measurement mean value of each frequency predetermined frame to adjust as AGC, the AGC that implements unified AGC value adjusts, and repeating step A2～A10 adjusts the satisfied condition of finishing until AGC.
The inventive method uses the maximum of the piecemeal chip power mean value of piecemeal chip power value after low-pass filtering of each frequency predetermined frame as each frequency power measurement values.
The pass band cut-off angular frequency scope that the inventive method is used is 0.05～0.2 π.
The reference index that the inventive method adopts the maximum RSSI_max of the piecemeal rssi measurement mean value of each frequency predetermined frame to adjust as AGC, the AGC that implements unified AGC value adjusts.
If the inventive method is preset frequency interval expression formula 2
n* the n value among the 200kHz is 0, then frequency power measurement array is not carried out interpolation processing, otherwise, can adopt polynomial interopolation methods such as linear interpolation, closest approach interpolation or cubic spline interpolation, also can adopt interpolating method that frequency power measurement array is carried out interpolation processing based on FFT.
The frequency power data match that the frequency power data match that the inventive method utilization measures is measured obtains the full frequency band power distribution curve.
The inventive method comprises the process that the full frequency band power distribution curve carries out smoothing processing:
C1, count Num, generate long L according to full frequency band frequency point
HFrequency domain band limit array H, L
HPower series for the minimum 2 that is not less than Num;
Band limit array H=[A B A], wherein, A is long L
AComplete 1 array, B is long L
BComplete 0 array, L
H, L
A, L
BBetween relation as follows:
In the formula, symbol
Expression rounds up to real number, and k is the band limit factor, span 3～6L
B=L
H-2L
A
C2, power_f is carried out L
HPoint FFT conversion obtains its frequency spectrum F_powe_f
C3, frequency spectrum F_power_f is carried out smoothing processing obtain powe_f_smooth, this step further comprises:
C3-1, establish: F_temp=Re (ifft (F_power_f.*H))
In the formula, real part is got in Re () expression, and ifft () represents anti-fast fourier transform, and .* represents the vector dot product;
The preceding Num point of C3-2, intercepting f_temp, the full frequency band power distribution curve power_f_smooth after acquisition is level and smooth.
The inventive method comprises with the process of the mode descending candidate frequency tabulation that power region peak value frequency is selected:
D1, in powe_f_smooth search power region peak value, form regional peak value frequency array area_peak, way of search is as follows:
Judge power_f_smooth
I-1＜=power_f_smooth
i﹠amp; ﹠amp; Power_f_smooth
i＞=power_f_smooth
I+1I=2,3 ..., Num-1
And will satisfy the pairing i value of following formula condition and deposit apea_peak in;
The bigger N of corresponding power among D2, the search area_peak
1Individual frequency is respectively with this N
1Frequency and apart from its nearest N
2Individual frequency is N altogether
1* (N
2+ 1) individual frequency and corresponding power thereof are added into the tabulation of candidate's frequency, wherein, and N
1, N
2Be predetermined value, N
1Span 2～5, N
2Span 2,4,6, repeat frequency if exist in the candidate's frequency tabulation, then merge and repeat frequency, simplify tabulation;
D3, each frequency in the candidate's frequency tabulation is pressed the power descending.
Description of drawings
Fig. 1: China is about the frequency spectrum planning schematic diagram of 3-G (Generation Three mobile communication system);
Fig. 2: the frame structure schematic diagram of TD-SCDMA system;
The burst structure schematic diagram of Fig. 3: DwPTS;
Fig. 4: the structural representation of conventional time slot;
Fig. 5: the inventive method is carried out the process chart of full frequency band frequency point scanning;
Fig. 6: the inventive method embodiment adopts the impulse response of 32 rank low pass filters and the curve chart of amplitude-frequency response, and Fig. 6 (a) is the pulse respond figure of low pass filter; Fig. 6 (b) is the amplitude-frequency response figure of low pass filter;
Fig. 7: correct frequency single frames receives the power contrast schematic diagram of each chip of data power low-pass filtering front and back among the inventive method embodiment, and wherein, last figure is the power before the filtering of single frames deblocking, and figure below is filtered power;
Fig. 8: the curve chart that scans the frequency power measurement array p_freq that obtains among the inventive method embodiment at interval;
Fig. 9: the full frequency band power distribution curve power_f schematic diagram that obtains after the data fitting among the inventive method embodiment;
Figure 10: the full frequency band power distribution curve power_f_smooth schematic diagram among the inventive method embodiment after the smoothing processing.
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the frequency spectrum planning schematic diagram of China about 3-G (Generation Three mobile communication system).As seen from the figure, the TDD correspondence is three sections asymmetric frequency spectrums such as 1880～1920MHz, 2010～2025MHz and 2300～2400MHz.
Fig. 2 is the frame structure schematic diagram of TD-SCDMA system.As seen from the figure; the spreading rate of TD-SCDMA system is 1.28Mcps; each wireless sub-frame length is 5ms; i.e. 6400 chips (abbreviating chip as); wherein; each subframe can be divided into 7 conventional time slot TS0～TS6 again, and descending pilot frequency time slot (abbreviating DwPTS as), uplink pilot time slot (abbreviating UpPTS as) and a main protection (are protected and abbreviated GP at interval as) at interval.The TS0 time slot of this system is always distributed to down link, is used for bearing system broadcast channel and other possible down channel; TS1～TS6 time slot then is used to carry the uplink and downlink Traffic Channel.It is synchronous that UpPTS and DwPTS are used for setting up initial uplink and downlink respectively.
Fig. 3 is the burst structure schematic diagram of DwPTS.As seen from the figure, comprise the descending synchronous code (abbreviating SYNC_DL as) of a 64chip in the burst structure of DwPTS, its effect is that cell ID and initial synchronisation are set up.
Fig. 4 is the structural representation of conventional time slot.As seen from the figure, the length of conventional time slot TS0～TS6 is 864chip, wherein comprise the data symbol of two segment lengths for 352chip, and a middle segment length is the midamble training sequence of 144chip.This training sequence is significant in the TD-SCDMA system, and effect comprises cell ID, channel estimating and synchronous (comprising Frequency Synchronization) etc.
Fig. 5 is the process chart that the inventive method is carried out full frequency band frequency point scanning.As seen from the figure, the inventive method handling process of carrying out full frequency band frequency point scanning may further comprise the steps:
A, according to predetermined frequency interval with measure frame number employed frequency range is carried out power measurement, obtain frequency power measurement array, and determine whether frequency power measurement array is carried out interpolation processing according to preset frequency value at interval;
The frequency power data that the frequency power data that B, utilization measure utilizes the interpolation method match to measure obtains the full frequency band power distribution curve;
C, the full frequency band power distribution curve is carried out smoothing processing;
D, the mode descending candidate frequency tabulation of selecting with power region peak value frequency;
E, according to the putting in order of candidate's frequency tabulation, enter the ICS processing procedure successively.
Specific embodiment:
In the present embodiment, frequency departure is 6kHz between UE and place cell base station, and channel circumstance is the Case3 channel of standard 3GPPTS 25.102 regulations, signal to noise ratio-2dB.Place base station in service sector working frequency points is 2012.2MHz, and except that TS0 time slot and DwPTS, all the other time slots all do not have information in this base station one subframe signal.Other has two interference of adjacent base station signals, working frequency points is respectively 2018.6MHz and 2022.4MHz, and this two base station signal has carried out wave beam forming in UE place direction, and for UE, the business time-slot power that interfered cell carries out figuration significantly is better than the broadcast channel power of UE place cell base station.
The concrete steps of present embodiment comprise:
A, according to predetermined frequency interval with measure frame number employed frequency range is carried out power measurement, obtain frequency power measurement array, this step further comprises:
A1, initialization AGC gain is for making it at all undersaturated arbitrary value of each frequency receiver;
A2, initialization data piece rssi measurement array RSSI, piece power measurement array power, frequency power measurement array p_freq are complete 0 array; Maximum frequency RSSI value RSSI_max=0;
A3, be 2010～2025MHz in the employed frequency range of present embodiment, according to predetermined frequency interval 2
n* the power measurement frequency in the employed frequency range of 200kHz (n=1 in the present embodiment) selective sequential, the frequency starting point is the 2nd in the effective frequency of full frequency band
nIndividual (being 2010.2MHz);
A4, order receive frame data in candidate's power measurement frequency, it is divided into N piece (N=25 in the present embodiment), monolithic data length L (L=256 in the present embodiment);
A5, calculate the average chip power of every blocks of data respectively, and its contraposition is superimposed among the piece rssi measurement array RSSI (being initially complete 0 array of long N);
A6, calculate each chip power of each blocks of data and the block code sheet power data of long L carried out low-pass filtering respectively, the average chip power of each blocks of data after the calculation of filtered again, and it is superimposed on piece power measurement array power (being initially complete 0 array of long N), wherein, the low pass filter that uses in the present embodiment is 32 rank low pass filters, and its passband cut-off angular frequency scope is 0.05～0.2 π;
Fig. 6 is that the inventive method embodiment adopts the impulse response of 32 rank low pass filters and the curve chart of amplitude-frequency response.Wherein, Fig. 6 (a) is the pulse respond figure of low pass filter, abscissa indicating impulse response each point among the figure, and ordinate is represented the impulse response of each point correspondence; Fig. 6 (b) is the amplitude-frequency response figure of low pass filter, and abscissa is represented normalized radian frequency among the figure, and ordinate is represented each normalized radian frequency respective frequencies response.Because the ideal waveform of available signal power is a square wave, the frequency spectrum of square wave is positioned at low-frequency range.The block data power that receives is carried out low-pass filtering, can effectively leach the interference of HFS, recover ideal square wave.
Fig. 7 is the power contrast schematic diagram that correct frequency single frames receives each chip of data power low-pass filtering front and back among the inventive method embodiment, and wherein, last figure is the power before the filtering of single frames deblocking, and figure below is filtered power.The corresponding single frames data of abscissa chip among the figure, the power of corresponding each chip of ordinate.As seen from the figure, significantly, the square-wave signal of the TS0 time slot of useful signal and DwPTS part power correspondence has obtained recovery after the filtering, and noise jamming has been subjected to effective inhibition.
A7, repeating step A4～A6 are up to finishing predetermined fn-1 (fn=2 in the present embodiment) frame;
A8, piece rssi measurement array RSSI are every divided by fn (fn=2 in the present embodiment), wherein maximum of search, and the size of itself and RSSI_max relatively, and the greater composed to RSSI_max; Piece power measurement array power is every divided by fn (fn=2 in the present embodiment), search maximum wherein, in frequency power measurement array p_freq, wherein, the length of frequency power measurement array p_freq is 2 of the interior effectively frequency number of employed frequency range with its order assignment
-nBe in the employed frequency range half of effective frequency number among the inventive method embodiment, effectively the frequency number is 76 in 2010～2025MHz frequency range, and then p_freq length is 38, correspondence 38 frequencies 2010.2,2010.6 to be measured ..., 2025MHz;
A9, INIT block rssi measurement array RSSI, piece power measurement array power are complete 0 array;
A10, order enter next frequency, and repeating step A4～A9 is until all frequencies of completing steps A3 selection;
A11, the reference index that adopts the maximum RSSI_max of the piecemeal rssi measurement mean value of each frequency predetermined frame to adjust as AGC, the AGC that implements unified AGC value adjusts, and repeating step A2～A10 adjusts the satisfied condition of finishing until AGC.
Fig. 8 is the curve chart of the frequency power measurement values array p_freq that obtains of interval scan, among the figure, and the corresponding p_freq each point of abscissa, i.e. power measurement frequency, corresponding each the frequency power measurement values of p_freq of ordinate.
The frequency power data that the frequency power data match that B, utilization measure is measured obtains the full frequency band power distribution curve
In the present embodiment, adopt the interpolation method of one-dimensional linear interpolation that frequency power measurement array p_freq is carried out interpolation processing, processing mode is as follows:
The frequency power data that the frequency power data match that utilization measures is measured obtains full frequency band power distribution curve power_f.
Because the power of full frequency band power distribution curve adjacent frequency is to be mutually related, it is rational therefore using the mode of data fitting to approach the power of not measuring frequency.Simultaneously, the mode of interval scan match full frequency band power distribution curve has been saved processing time of full frequency band power measurement effectively.
Fig. 9 is the schematic diagram of the full frequency band power distribution curve power_f that obtains after the data fitting, among the figure, and the corresponding power_f each point of abscissa, i.e. each frequency of full frequency band, the corresponding power_f each point of ordinate performance number.As seen from the figure, there is tangible curve burr in the full frequency band power distribution curve that match obtains owing to be subjected to the influence of noise and channel fading.
C, the full frequency band power distribution curve is carried out smoothing processing
Because the power of full frequency band power distribution curve adjacent frequency should be slowly to change, therefore need carry out smoothing processing to the distribution curve that match obtains, eliminate the curve burr.This step comprises:
In C1, the present embodiment, effective frequency is counted Num=76 among frequency range 2010～2025MHz, therefore, is not less than the power series L of the minimum 2 of Num
H=2
7=128;
Band-limited function H=[A B A], wherein A is long L
AComplete 1 array, B is long L
BComplete 0 array,
L
B＝L
H-2L
A
In the formula, symbol
Expression rounds up to real number, so, L
A=13, L
B=102;
C2, power_f is carried out L
HPoint FFT conversion obtains its frequency spectrum F_power_f
C3, frequency spectrum F_power_f is carried out smoothing processing obtain power_f_smooth, this step further comprises:
C3-1, establish: F_temp=Re (ifft (F_power_f.*H))
In the formula, real part is got in Re () expression, and ifft () represents anti-fast fourier transform, and .* represents the vector dot product;
The preceding Num point of C3-2, intercepting F_temp, the full frequency band power distribution curve power_f_smooth after acquisition is level and smooth.
Figure 10 is the full frequency band power distribution curve power_f_smooth schematic diagram after the smoothing processing, among the figure, and the corresponding power_f_smooth each point of abscissa, i.e. each frequency of full frequency band, the corresponding power_f_smooth each point of ordinate performance number.Comparison diagram 9,10 as can be known, the smooth effect of smoothing processing is obvious, has effectively eliminated the power distribution curve burr.
D, with the mode descending candidate frequency tabulation that power region peak value frequency is selected, this step comprises:
D1, in power_f_smooth search power region peak value, form regional peak value frequency array area_peak, way of search is as follows:
Judge power_f_smooth
I-1＜=power_f_smooth
i﹠amp; ﹠amp; Power_f_smooth
i＞=power_f_smooth
I+1I=2,3 ..., Num-1
And will satisfy the pairing i value of following formula condition and deposit area_peak in, in the present embodiment, obtain regional peak value frequency array area_peak=[1 2,24,44,63,75];
The bigger N of corresponding power among D2, the search area_peak
1Individual frequency is respectively with this N
1Frequency and apart from its nearest N
2Individual frequency is N altogether
1* (N
2+ 1) individual frequency and corresponding power thereof are added into the tabulation of candidate's frequency, in the present embodiment, and N
1=3, N
2=2, it is 9 that final frequency candidate list intermediate frequency is counted;
D3, with each frequency in the candidate's frequency tabulation by the performance number descending, in the present embodiment, the final candidate's frequency tabulation that obtains is [44,43,45,63,62,64,12,11,13], be converted to the frequency points corresponding tabulation for [2018.6,2018.4,2018.8,2022.4,2022.2,2022.6,2012.2,2012.0,2012.4].
E, according to the putting in order of candidate's frequency tabulation, enter the ICS processing procedure successively.
In the present embodiment, correct frequency is 2012.2MHz, and the strong jamming frequency is respectively 2018.6MHz and 2022.4MHz.Obviously, when forming the tabulation of candidate's frequency, because correct frequency place power measurement values is not outstanding, carry out the descending of frequency power in the usual way, correct frequency is difficult to enter the limited candidate's frequency tabulation of frequency number.Strict counting, the routine ordering cis-position of correct frequency is the 18th, promptly UE need carry out the ICS processing procedure respectively and can successfully login the sub-district at least 18 frequencies, has prolonged the time of UE login sub-district greatly.Adopt the power region peak value frequency selection mode of the inventive method, correct frequency cis-position effectively is advanced to the 7th, has obviously shortened the time of ICS processing procedure on the invalid frequency, has improved the efficient of UE login sub-district.
The present invention compares with the method for scanning frequency points that scans thought based on two steps, owing to avoided carefully sweeping step, amount of calculation is more or less the same under the prerequisite of using the same scan interval.Through preferred embodiment as can be known, the present invention has significant advantage than existing methods on the frequency point scanning performance, is handling not obviously increase on the complexity simultaneously.
The present invention is specially adapted to portable terminal and carries out frequency point scanning in low Signal to Interference plus Noise Ratio environment.General, base station and terminal room channel circumstance are abominable more, disturb by force more system in, and the present invention has algorithm relatively now, can improve the performance that full frequency band frequency point scans more.
Simultaneously, the present invention can be applicable to other multiple mobile communication system equally through reasonably changing.
The inventive method also can have other various embodiments; without departing from the spirit and substance of the case in the method for the present invention; those skilled in the art work as can make various corresponding changes or distortion according to the inventive method, but these corresponding changes or distortion all belong to claim protection range of the present invention.
Claims (9)
1, realize the scan method of full frequency band frequency point in a kind of Time Division-Synchronous Code Division Multiple Access wireless communication system (abbreviating the TD-SCDMA system as), according to predetermined frequency interval and measurement frame number employed frequency range is carried out power measurement, it is characterized in that: after obtaining frequency power measurement array, determine whether frequency power measurement array is carried out interpolation processing according to preset frequency value at interval, the frequency power data that the frequency power data match that utilization measures is measured, obtain the full frequency band power distribution curve, the full frequency band power distribution curve is carried out smoothing processing, the mode of selecting with power region peak value frequency generate the tabulation of candidate's frequency and by and by the descending of power measurement values size, at last, according to putting in order of candidate's frequency tabulation, enter the ICS processing procedure successively.
2, according to the described scan method of claim 1, it is characterized in that: the step of obtaining frequency power measurement array comprises:
A1, initialization AGC gain is for making receiver at all undersaturated arbitrary value in each frequency place;
A2, initialization data piece rssi measurement array RSSI, piece power measurement array power, frequency power measurement array p_freq are complete 0 array; Maximum frequency RSSI value RSSI_max=0;
A3, according to the power measurement frequency in the predetermined employed frequency range of frequency interval selective sequential, wherein, preset frequency is spaced apart 2
n* 200kHz, n is the integer of span 0～2, the frequency starting point is the 2nd in the full frequency band frequency point
nIndividual;
A4, order receive frame data in candidate's power measurement frequency, it is divided into the N piece, monolithic data length L, and wherein, N, L are predetermined number, the L span is the integer of aliquot 6400 in 160～432, N=6400/L;
A5, calculate the average chip power of every blocks of data respectively, and its contraposition is superimposed among the piece rssi measurement array RSSI (being initially complete 0 array of long N);
A6, calculate each chip power of each blocks of data and the block code sheet power data of long L carried out low-pass filtering respectively, the average chip power of each blocks of data after the calculation of filtered again, and it is superimposed on piece power measurement array power (being initially complete 0 array of long N), wherein, pass band cut-off angular frequency scope is 0.05～0.2 π;
A7, repeating step A4～A6 are up to finishing predetermined fn-1 frame, and wherein, fn is 2～5 integer;
RSSI is every divided by fn for A8, piece rssi measurement array, wherein maximum of search, and the size of this maximum and RSSI_max relatively, and the greater composed to RSSI_max; Power is every divided by fn for piece power measurement array, search maximum wherein, and in frequency power measurement array p_freq, wherein, the length of frequency power measurement array p_freq is 2 of the interior effectively frequency number of employed frequency range with its order assignment
-n
A9, INIT block rssi measurement array RSSI, piece power measurement array power are complete 0 array;
A10, order enter next frequency, and repeating step A4～A9 is until all frequencies of completing steps A3 selection;
A11, the reference index that adopts the maximum RSSI_max of the piecemeal rssi measurement mean value of each frequency predetermined frame to adjust as AGC, the AGC that implements unified AGC value adjusts, and repeating step A2～A10 adjusts the satisfied condition of finishing until AGC.
3, according to the described scan method of claim 1, it is characterized in that: the maximum of the piecemeal chip power mean value of piecemeal chip power value after low-pass filtering of using each frequency predetermined frame is as each frequency power measurement values.
4, according to the described scan method of claim 1, it is characterized in that: pass band cut-off angular frequency scope is 0.05～0.2 π.
5, according to the described scan method of claim 1, it is characterized in that: the reference index that adopts the maximum RSSI_max of the piecemeal rssi measurement mean value of each frequency predetermined frame to adjust as AGC, implement the AGC adjustment of unified AGC value.
6, according to the described scan method of claim 1, it is characterized in that: if preset frequency interval expression formula 2
n* the n value among the 200kHz is 0, then frequency power measurement array is not carried out interpolation processing, otherwise, can adopt polynomial interopolation methods such as linear interpolation, closest approach interpolation or cubic spline interpolation, also can adopt interpolating method that frequency power measurement array is carried out interpolation processing based on FFT.
7, according to the described scan method of claim 1, it is characterized in that: the frequency power data that the frequency power data that utilization measures is measured by the interpolation method match obtains the full frequency band power distribution curve.
8, according to the described scan method of claim 1, it is characterized in that: the process of the full frequency band power distribution curve being carried out smoothing processing comprises:
C1, count Num, generate long L according to full frequency band frequency point
HFrequency domain band limit array H, L
HBe the power series of the minimum 2 that is not less than Num,
Band-limited function H=[A B A], wherein, A is long L
AComplete 1 array, B is long L
BComplete 0 array, L
H, L
A, L
BBetween relation as follows:
In the formula, symbol
Expression rounds up to real number, and k is the band limit factor, span 3～6
L
B＝L
H-2L
A；
C2, power_f is carried out L
HPoint FFT conversion obtains its frequency spectrum F_power_f
C3, frequency spectrum F_power_f is carried out smoothing processing obtain powe_f_smooth, this step further comprises:
C3-1, establish: F_temp=Re (ifft (F_power_f.*H))
In the formula, real part is got in Re () expression, and ifft () represents anti-fast fourier transform, and .* represents the vector dot product;
The preceding Num point of C3-2, intercepting F_temp, the full frequency band power distribution curve power_f_smooth after acquisition is level and smooth.
9, according to the described scan method of claim 1, it is characterized in that: the process of tabulating with the mode descending candidate frequency of power region peak value frequency selection comprises:
D1, in powe_f_smooth search power region peak value, form regional peak value frequency array area_peak, way of search is as follows:
Judge power_f_smooth
I-1＜=power_f_smooth
i﹠amp; ﹠amp; Power_f_smooth
i〉=power_f_smooth
I+1I=2,3 ..., Num-1
And will satisfy the pairing i value of following formula condition and deposit area_peak in;
The bigger N of corresponding power among D2, the search area_peak
1Individual frequency is respectively with this N
1Frequency and apart from its nearest N
2Individual frequency is N altogether
1* (N
2+ 1) individual frequency and corresponding power thereof are added into the tabulation of candidate's frequency, wherein, and N
1, N
2Be predetermined value, N
1Span 2～5, N
2Span 2,4,6, repeat frequency if exist in the candidate's frequency tabulation, then merge and repeat frequency, simplify tabulation;
D3, with each frequency in the candidate's frequency tabulation by the performance number descending.
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