CN1905713A - Method and system for estimating and regulating mobile terminal frequency deviation - Google Patents

Abstract

The invention discloses a method and system for estimating and adjusting the frequency offset of the mobile terminal, which is applicable for TD-SCDMA mobile communication network with the same frequency. The detecting procedure obtains the available areas with the same frequency according to the power and threshold of the received telephone number. The calculating procedure calculates estimated frequency offset values about all the described areas. The combine procedure combines all the offset values to give the final value about the mobile terminals.

Description

The method and system that portable terminal frequency offset estimating and frequency deviation are adjusted

Technical field

The present invention relates in the TD SDMA TD-SCDMA mobile communication system, particularly TD-SCDMA mobile communication system method and the device adjusted with terminal frequency offset estimating and frequency deviation under the situation of frequently arranging net.

Background technology

Along with the development and 3G (3G (Third Generation) Moblie) rise in the world of mobile communication technology, the more and more anxiety that Radio Resource becomes as a kind of Limited resources.

For the TD-SCDMA system of one of 3G mainstream standard, its Radio Resource that is assigned with also is very limited.In order to improve the availability of frequency spectrum of TD-SCDMA system, identical networking becomes a kind of the most effectively solution.

In mobile communication system, when user terminal is started shooting, there is the certain frequency deviation between carrier frequency and the local crystal oscillator, have only and estimate this frequency departure fast and effectively, just can carry out frequency compensation, reach the frequency departure that receiver can be accepted, thereby carry out next step flow of task.And under the condition of identical networking,, therefore disturb relatively largely because co-frequency cell is adjacent, will produce bigger influence to some the frequency offset estimating algorithms under the inter-frequency networking condition.So in mobile communication system terminal, under the identical networking condition, how can estimate this frequency departure fast and effectively, fast and accurately frequency deviation is adjusted then, be the key component that is directly connected to communication speed and quality in the moving communicating field.

Application number is used for the situation of inter-frequency networking for 200410078003 patent application provides a kind of frequency deviation estimation device and method, and wherein this frequency deviation estimation device comprises:

One effective diameter choice device according to the frame data and the local signal that receive, is selected to be less than or equal to the effective diameter of predetermined number, and is calculated the positional information of these effective diameters;

One effective diameter data pick-up device according to the positional information of a plurality of effective diameters of effective diameter choice device output, comes out each synchronous code data pick-up that comprises selected effective diameter from the data that receive respectively;

At least one single footpath frequency offset estimator, the synchronous code data and the local signal of each effective diameter that extracts according to effective diameter data pick-up device carry out frequency offset estimating according to each effective diameter independently; With

Effective diameter frequency deviation consolidator after it receives the estimation frequency deviation of effective diameter of all selections of this frame, merges the estimation frequency deviations in all footpaths and calculate the frequency deviation of this frame.

Yet, above-mentioned apparatus and method also are not suitable for same frequency in the TD-SCDMA system arrange net portable terminal frequency offset estimating and frequency deviation adjustment under the situation, therefore are necessary to propose a kind of method and system of adjusting with co-frequency cell frequency offset estimating in the TD-SCDMA system frequently and frequency deviation.

Summary of the invention

The method and system that the object of the present invention is to provide a kind of portable terminal frequency offset estimating and frequency deviation to adjust, the same frequency of realizing the TD-SCDMA system arrange net portable terminal frequency offset estimating and frequency deviation adjustment under the situation.

To achieve these goals, the invention provides a kind of portable terminal frequency deviation estimating method, be used for the TD-SCDMA mobile communication system, comprising with the situation of frequently arranging net:

Effectively co-frequency cell detects step, according to obtaining effective co-frequency cell with the received signal code power of each sub-district of frequency and the detection threshold of setting;

Effective co-frequency cell frequency offset calculation step is calculated the frequency offset estimating value of all effective co-frequency cells; With

The frequency deviation combining step obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells merged.

Above-mentioned portable terminal frequency deviation estimating method wherein, in the described frequency deviation combining step, adopts high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

Above-mentioned portable terminal frequency deviation estimating method, wherein, the received signal code power of described co-frequency cell calculates according to the intermediate code among descending synchronous code or the time slot #0.

Above-mentioned portable terminal frequency deviation estimating method, wherein, the following operation of the concrete execution of described effective co-frequency cell frequency offset calculation step:

In maximum channel profile window, detect the multipath information of effective co-frequency cell, then each effective diameter is carried out frequency offset estimating after, obtain the corresponding effectively frequency offset estimating value of co-frequency cell after the frequency offset estimating of each effective diameter merged.

In order better to realize that above-mentioned purpose, the present invention also provide a kind of portable terminal frequency offset estimating system, be used for the TD-SCDMA mobile communication system with the situation of frequently arranging net, comprise co-frequency cell frequency offset calculation module, also comprise:

Effectively the co-frequency cell detection module is used for according to obtaining effective co-frequency cell with the received signal code power and the detection threshold of each sub-district of frequency;

Frequency deviation merges module, is used for obtaining after frequency offset estimating value with all effective co-frequency cells merges the final frequency offset estimating value of portable terminal;

Described co-frequency cell frequency offset calculation module is used to calculate the frequency offset estimating value of all effective co-frequency cells.

Above-mentioned portable terminal frequency offset estimating system, wherein, described frequency deviation merges module, specifically is used to utilize high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

In order better to realize above-mentioned purpose, the present invention also provides a kind of portable terminal frequency offset regulation method, is used for the TD-SCDMA mobile communication system with the situation of frequently arranging net, and comprising:

Effectively co-frequency cell detects step, obtains effective co-frequency cell according to the received signal code power and the detection threshold of co-frequency cell;

Effective co-frequency cell frequency offset calculation step is calculated the frequency offset estimating value of all effective co-frequency cells;

The frequency deviation combining step obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells merged;

Frequency deviation adjusted value determining step is calculated frequency deviation adjusted value-sign (Δ f _n) * Δ S _n, wherein sign is a sign function, Δ f _nThe frequency offset estimating value that obtains for the frequency deviation combining step or the mean value of a plurality of frequency offset estimating values, Δ S _nFor frequency deviation is adjusted the factor;

The FREQUENCY CONTROL step according to frequency deviation adjustment calculation local carrier frequency, and utilizes local carrier frequency to control the local carrier frequency of voltage controlled oscillator.

Above-mentioned portable terminal frequency offset regulation method wherein, in the described frequency deviation combining step, adopts high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

Above-mentioned portable terminal frequency offset regulation method, wherein, the received signal code power of described co-frequency cell calculates according to the intermediate code among descending synchronous code or the time slot #0.

Above-mentioned portable terminal frequency offset regulation method, wherein, the following operation of the concrete execution of described effective co-frequency cell frequency offset calculation step:

In maximum channel profile window, detect the multipath information of effective co-frequency cell, then each effective diameter is carried out frequency offset estimating after, obtain the corresponding effectively frequency offset estimating value of co-frequency cell after the frequency offset estimating of each effective diameter merged.

Above-mentioned portable terminal frequency offset regulation method, wherein, frequency deviation is adjusted the factor along with the descending variation of increase of adjusting number of times.

Above-mentioned portable terminal frequency offset regulation method, wherein, frequency deviation is adjusted the factor and is determined according to following formula:

$\mathrm{\&Delta;}{S}_n=\left\{\begin{array}{cc}\mathrm{\&Delta;}{S}_{n-1}*k& \mathrm{\&Delta;}{f}_n*\mathrm{\&Delta;}{f}_{n-1}>0\\ \mathrm{\&Delta;}{S}_{n-1}/k& \mathrm{\&Delta;}{f}_n*\mathrm{\&Delta;}{f}_{n-1}<0\end{array}\right.$

Wherein, Δ S _N-1For the frequency deviation of last time is adjusted the factor, Δ f _N-1With Δ f _nBe respectively last time and the final frequency offset estimating value of this portable terminal or the mean value of a plurality of final frequency offset estimating values, k is that frequency deviation is adjusted the factor variations step-length.

In order better to realize above-mentioned purpose, the present invention also provides a kind of portable terminal frequency deviation Adjustment System, is used for the TD-SCDMA mobile communication system with the situation of frequently arranging net, and comprising:

Effectively the co-frequency cell detection module is used for obtaining effective co-frequency cell according to the received signal code power and the detection threshold of co-frequency cell;

Effective co-frequency cell frequency offset calculation module is used to calculate the frequency offset estimating value of all effective co-frequency cells;

Frequency deviation merges module, is used for obtaining after frequency offset estimating value with all effective co-frequency cells merges the final frequency offset estimating value of portable terminal;

Frequency deviation adjusted value determination module is used to calculate frequency deviation adjusted value-sign (Δ f _n) * Δ S _n, wherein sign is a sign function, Δ f _nThe frequency offset estimating value that obtains for the frequency deviation combining step or the mean value of a plurality of frequency offset estimating values, Δ S _nFor frequency deviation is adjusted the factor;

The frequency sum filter is used for according to frequency deviation adjustment calculation local carrier frequency, and utilizes the local carrier frequency of local carrier frequency control voltage controlled oscillator.

Above-mentioned portable terminal frequency deviation Adjustment System, wherein, described frequency deviation merges module, specifically is used to utilize high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

After merging by the frequency offset estimating value with all effective co-frequency cells, the method and system of portable terminal frequency offset estimating of the present invention and frequency deviation adjustment obtains the final frequency offset estimating value of portable terminal, frequency offset estimating and frequency deviation adjustment under the simple and effective identical networking situation that has realized TD-SCDMA.

Description of drawings

Fig. 1 is the schematic flow sheet of portable terminal frequency deviation estimating method of the present invention;

Fig. 2 is the schematic flow sheet of portable terminal frequency offset regulation method of the present invention.

Embodiment

As shown in Figure 1, portable terminal frequency deviation estimating method of the present invention comprises the steps:

Effectively co-frequency cell detects step, utilize the intermediate code (midamble) among descending synchronous code SYNC-DL or the time slot #0 to calculate together RSCP (the Received Signal Code Power of each sub-district correspondence frequently by effective co-frequency cell detection module, received signal code power), and according to the RSCP of co-frequency cell and the detection threshold of setting obtain effective co-frequency cell;

Effective co-frequency cell frequency offset calculation step, it according to application number the frequency deviation estimation device/method of 200410078003 patent application, by effective co-frequency cell frequency offset calculation module based on channel profile window, in maximum channel profile window, detect the multipath information of effective co-frequency cell, after then each effective diameter being carried out frequency offset estimating, obtain the corresponding effectively frequency offset estimating value of co-frequency cell after the frequency offset estimating of each effective diameter merged;

The frequency deviation combining step merge to merge that module carries out with the frequency offset estimating value of all effective co-frequency cells that high specific merges or constant power obtains the final frequency offset estimating value of portable terminal after merging by frequency deviation.

Below effective co-frequency cell is detected the calculating that utilizes SYNC-DL to carry out RSCP in the step and be described in detail, specifically comprise the steps:

Step S1 is according to the DwPTS sample sequence and the local related power value of obtaining DwPTS sample sequence correspondence with reference to the DwPTS sequence of Primary Location;

Respectively there is a zero energy district at the two ends of DwPTS time slot; be the hangover protection of TS0 time slot, protection zone and the up protection of DwPTS self; and the every frame of DwPTS all sends with firm power; like this; power features according to the DwPTS time slot just can tentatively be determined its position, determines SYNC-DL sign indicating number and its accurate position that use the sub-district according to matched filtering again.

Step S1 is by with DwPTS sample sequence and local with reference to the DwPTS sequence correlation computations that is shifted, and estimates to obtain the related power value by power.

Step S2, obtain the channel profile window (window that comprises all power) of DwPTS sample sequence correspondence according to the related power value of DwPTS sample sequence correspondence, and from the channel profile window of correspondence, select two groups of performance numbers (number of performance number is variable) respectively from big to small successively, and record position; The variable-length of this channel profile window, relevant with the maximum delay of estimated channel;

Step S3 selects the efficiently sampling sequence according to two groups of performance numbers selecting successively from big to small from the channel profile window of DwPTS sample sequence correspondence;

Step S4 detects effective diameter in the channel profile window and calculating noise power according to a plurality of performance numbers, the decision threshold of the efficiently sampling sequence correspondence of the related power value of efficiently sampling sequence, selection;

Step S5 carries out the RSCP measurement according to effective diameter and noise power.

Step S1 specifically may further comprise the steps:

The sequence number of the SYNC sign indicating number that step S11, reference signal generator search for as required produces corresponding local with reference to the DwPTS sequence;

Step S12, correlator is to DwPTS sample sequence S ₁And S ₂With this locality with reference to the DwPTS sequence correlation computations that is shifted, and the multiple correlation result of output displacement correlation computations (describe for convenient, the length of supposing the multiple correlation result is N); At this, sample sequence can be the single-time sampling sequence, also can be the double sampling sequence;

Step S13, power calculator asks mould square (mould) computing to obtain the related power value of sample sequence correspondence respectively to the multiple correlation result of correlator output, and the size of this value reflects the power of each footpath intensity.

Step S2 specifically may further comprise the steps:

Step S21, the related power value of sample sequence correspondence is a real number value at this, (describe with related power by channel profile window detector for convenient, suppose that length is W) in the related power value scope of two groups of sample sequence correspondences, move, obtain M (the individual window of M=(N-W)/S+1), wherein S is a moving step length, and N is multiple correlation result's a length;

Step S22, channel profile window detector related power in M the window is added up and maximum window as channel profile window;

Step S23, power packages select module from the channel profile window of DwPTS sample sequence correspondence respectively from big to small correspondence choose two groups of performance numbers and (describe for convenient, be assumed to be K at this), and the maximum in K the performance number of two groups of DwPTS sample sequence correspondences outputed to the efficiently sampling sequence selection module.K performance number supposing one group of DwPTS sample sequence correspondence is respectively a1, a2...aK, wherein aK is the maximum among a1, the a2...aK, K performance number of other one group of DwPTS sample sequence correspondence is respectively b1, b2...bK, wherein bK is the maximum among b1, the b2...bK, then aK and bK is sent to the efficiently sampling sequence selection module.

Among the step S3, the efficiently sampling sequence selection module selects maximum is bigger in two groups of performance numbers sequence as the efficiently sampling sequence.

Certainly, also can send to the efficiently sampling sequence selection module, select the maximum of the two, and select the bigger sample sequence of maximum as the efficiently sampling sequence by the efficiently sampling sequence selection module by two groups of performance numbers that channel profile window detector will be chosen.

Step S4 specifically may further comprise the steps:

Step S41, noise power calculation and effective diameter select the related power value of the efficiently sampling sequence of module reception related power calculated value module output, and received power value is selected K performance number of the efficiently sampling sequence of module output;

Step S42, noise power calculation and effective diameter select related power value, K performance number of efficiently sampling sequence, the decision parameter calculating noise power of module according to the efficiently sampling sequence;

Step S43, noise power calculation and effective diameter select module to calculate the power of effective diameter according to noise power and decision threshold.

Certainly, as previously mentioned, also can select module to select the related power value of efficiently sampling sequence correspondence, a plurality of performance numbers and the position thereof of efficiently sampling sequence correspondence by noise power calculation and effective diameter among the step S41 by related power value computing module and performance number screening module with a plurality of performance numbers of the correspondence of the related power value of all sample sequences, all sample sequences and the position all sends to noise power calculation and effective diameter is selected module according to the selection result of efficiently sampling sequence selection module.

Below step S42 and S43 are carried out further detailed description.

At first calculate the summation of the pairing related power value of efficiently sampling sequence, wherein expression formula is as follows:

$P_{\mathrm{all}}=\underset{n=0}{\overset{N-1}{\mathrm{\&Sigma;}}}{P}_n,$ n＝0，1，...，N-1

Wherein, because the length of correlated results is identical with the length of the related power value of ordered sequence, therefore represent the length of the related power value of efficiently sampling sequence with N at this;

Secondly from K performance number of efficiently sampling sequence selection, find out P signal path (P by certain decision rule _{S_1}, P _{S_2}..., P _{S_P}), alternative condition is as follows:

P _{S_1}＝max(P ₁，P ₂，...P _K)

P _{S_2}＞P _{S_1}×path ₂

P _{S_3}＞(P _{S_1}+P _{S_2})×path ₃



$P_{S\_P}>\underset{k=1}{\overset{P-1}{\mathrm{\&Sigma;}}}{P}_{S\_k}{\&times;\mathrm{path}}_P$

Wherein, Path ₂, Path ₃..., Path _PFor the predefined decision parameter of system, be used to find out effective signal path;

According to signal path that finds and the gross power P that calculates _AllObtain noise power P _Noise:

$P_{\mathrm{noise}}=P_{\mathrm{all}}-\underset{n=1}{\overset{P}{\mathrm{\&Sigma;}}}{P}_{S\_n},$

Obtain decision threshold (noise gate is given by system, is example with noise gate 12dB) at last here, all performance numbers less than this decision threshold all are changed to zero in the channel window of input, and wherein concrete processing method is as follows:

n＝1，...，W

Here coefficient 16 is the performance numbers that converted by Noise gate limit value 12dB.

At last, among the step S5, the common frequency measurement module is carried out corresponding computing according to noise power and effective diameter, obtains the RSCP value of expectation, and concrete computing formula is as follows:

$P_{\mathrm{RSCP}}=P_s-S\&times;\frac{P_{\mathrm{noise}}}{(N-K)}$

Wherein, P _sExpression through the power of non-zero power behind the de-noising processor and, S represents the path number through non-zero power behind the de-noising processor.

Obtaining entering the frequency deviation combining step after the frequency offset estimating value of all effective co-frequency cells, in the frequency deviation combining step, the frequency offset estimating value of all effective co-frequency cells can be carried out the final frequency offset estimating value that portable terminal is obtained in equal gain combining, the direct addition of frequency offset estimating value that is about to all effective co-frequency cells obtains the final frequency offset estimating value of portable terminal, also the frequency offset estimating value of all effective co-frequency cells can be carried out high specific and merge the final frequency offset estimating value of obtaining portable terminal, obtain the final frequency offset estimating value of portable terminal after soon the frequency offset estimating value of all effective co-frequency cells merges according to effective co-frequency cell power information separately.

Certainly, can also adopt selectivity to merge the final frequency offset estimating value that obtains portable terminal after mode merges the frequency offset estimating value of all effective co-frequency cells.

Portable terminal frequency offset regulation method of the present invention specifically comprises the steps: as shown in Figure 2

The frequency offset estimating step, after obtaining effective co-frequency cell according to the RSCP of co-frequency cell and detection threshold, calculate the frequency offset estimating value of each effective co-frequency cell respectively, and obtain the final frequency offset estimating value of portable terminal after the frequency offset estimating value merging with each effective co-frequency cell;

Frequency deviation adjusted value determining step, being calculated as-sign (Δ f of frequency deviation adjusted value _n) * Δ S _n, wherein sign is a sign function, Δ f _nBe the mean value of m frequency offset estimating value, Δ S _nBe to adjust the factor according to the frequency deviation that default principle is determined;

FREQUENCY CONTROL step, frequency sum filter be according to frequency deviation adjustment calculation local carrier frequency, and utilize the local carrier frequency of local carrier frequency control voltage controlled oscillator, makes it to converge on the carrier frequency of received signal.

Below to the frequency deviation of portable terminal frequency offset regulation method of the present invention adjust the factor determine be described in detail.

The present invention adopts dual mode to determine the frequency deviation adjustment factor, is described respectively below.

＜the first kind of mode 〉

The setting that frequency deviation is adjusted the factor is a principle of following descending variation along with the increase of adjusting number of times.As:

$\mathrm{\&Delta;}{S}_n=\left\{\begin{array}{c}1/2;n=\mathrm{1,2}...,5;\\ 1/4;n=\mathrm{6,7}...,10;\\ 1/8;n=\mathrm{11,12}....\end{array}\right.$

This is because when initial the adjustment, frequency deviation may be very big, adopting big frequency deviation adjustment to adjust the factor can accelerate to regulate the speed, and behind certain adjustment frame number, frequency deviation restrains gradually, to cause occurring big frequency deviation jitter error if still adopt bigger frequency deviation to adjust the factor, and adopt this moment little frequency deviation to adjust the factor, jitter error will reduce.

＜the second way 〉

Determine the frequency deviation adjustment factor according to the final frequency offset estimating value of portable terminal, it specifically comprises the steps:

At first, obtain repeatedly to be averaged after the final frequency offset estimating value of portable terminal and obtain mean value, can reduce the variance of frequency offset estimating like this, increase accuracy of frequency offset estimation; At this, be convenient and describe, the mean value of the final frequency offset estimating value of portable terminal is designated as Δ f;

Then, the mean value Δ f according to portable terminal frequency offset estimating value determines the frequency deviation adjustment factor;

In this step, an initial frequency deviation at first is set and adjusts factor S ₁, beginning most, in the FREQUENCY CONTROL step, frequency deviation is adjusted according to the initial frequency deviation adjusted value;

After the scheduled time, the mean value that obtains second portable terminal frequency offset estimating value is designated as Δ f ₂, at this moment, redefine frequency deviation according to the mean value of two portable terminal frequency offset estimating values and adjust factor S ₂, as:

${\mathrm{\&Delta;S}}_2=\left\{\begin{array}{cc}\mathrm{\&Delta;}{S}_1*k& \mathrm{\&Delta;}{f}_2*\mathrm{\&Delta;}{f}_1>0\\ \mathrm{\&Delta;}{S}_1/k& \mathrm{\&Delta;}{f}_2*\mathrm{\&Delta;}{f}_1<0\end{array}\right.$

Here k is that frequency deviation is adjusted the factor variations step-length, and as k=2, the FREQUENCY CONTROL step is utilized Δ S then ₂Carry out the frequency deviation adjustment, after the scheduled time, the mean value that obtains the 3rd portable terminal frequency offset estimating value is designated as Δ f ₃, at this moment, redefine frequency deviation according to the mean value of two portable terminal frequency offset estimating values and adjust factor S ₃, as:

$\mathrm{\&Delta;}{S}_3=\left\{\begin{array}{cc}\mathrm{\&Delta;}{S}_2*k& \mathrm{\&Delta;}{f}_3*\mathrm{\&Delta;}{f}_2>0\\ \mathrm{\&Delta;}{S}_2/k& {\mathrm{\&Delta;f}}_3*{\mathrm{\&Delta;f}}_2<0\end{array}\right.$

By that analogy, can obtain:

$\mathrm{\&Delta;}{S}_n=\left\{\begin{array}{cc}\mathrm{\&Delta;}{S}_{n-1}*k& \mathrm{\&Delta;}{f}_n*{\mathrm{\&Delta;f}}_{n-1}>0\\ \mathrm{\&Delta;}{S}_{n-1}/k& \mathrm{\&Delta;}{f}_n*{\mathrm{\&Delta;f}}_{n-1}<0\end{array}\right.$

At this, can set the scope that a frequency deviation is adjusted the factor, as 2 ⁿ＜Δ S _n≤ 1 (n=-5) needs to set initial value simultaneously, as Δ S ₁=1, at this moment, adjusting frequency deviation that the computing formula of the factor obtains according to frequency deviation adjusts the factor and might exceed its setting range, if adjust the maximum of the scope of the factor greater than frequency deviation, then frequency deviation is adjusted the factor and is set to the maximum that frequency deviation is adjusted the scope of the factor, if adjust the minimum value of the scope of the factor less than frequency deviation, then frequency deviation is adjusted the factor and is set to the minimum value that frequency deviation is adjusted the scope of the factor.

The just frequency deviation of foregoing description is adjusted the determining of numerical value of the factor, being calculated as-sign (Δ f of frequency deviation adjusted value _n) * Δ S _n, wherein sign is a sign function.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (15)

1. a portable terminal frequency deviation estimating method is used for the TD-SCDMA mobile communication system with the situation of frequently arranging net, and it is characterized in that, comprising:

Effectively co-frequency cell detects step, according to obtaining effective co-frequency cell with the received signal code power of each sub-district of frequency and the detection threshold of setting;

Effective co-frequency cell frequency offset calculation step is calculated the frequency offset estimating value of all effective co-frequency cells; With

The frequency deviation combining step obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells merged.

2. portable terminal frequency deviation estimating method according to claim 1, it is characterized in that, in the described frequency deviation combining step, adopt high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

3. portable terminal frequency deviation estimating method according to claim 1 and 2 is characterized in that, the received signal code power of described co-frequency cell calculates according to the intermediate code among descending synchronous code or the time slot #0.

4. portable terminal frequency deviation estimating method according to claim 1 and 2 is characterized in that, the following operation of the concrete execution of described effective co-frequency cell frequency offset calculation step:

In maximum channel profile window, detect the multipath information of effective co-frequency cell, then each effective diameter is carried out frequency offset estimating after, obtain the corresponding effectively frequency offset estimating value of co-frequency cell after the frequency offset estimating of each effective diameter merged.

5. a portable terminal frequency offset estimating system is used for the TD-SCDMA mobile communication system with the situation of frequently arranging net, and comprises co-frequency cell frequency offset calculation module, it is characterized in that, also comprises:

Effectively the co-frequency cell detection module is used for according to obtaining effective co-frequency cell with the received signal code power and the detection threshold of each sub-district of frequency;

Frequency deviation merges module, is used for obtaining after frequency offset estimating value with all effective co-frequency cells merges the final frequency offset estimating value of portable terminal;

Described co-frequency cell frequency offset calculation module is used to calculate the frequency offset estimating value of all effective co-frequency cells.

6. portable terminal frequency offset estimating according to claim 5 system, it is characterized in that, described frequency deviation merges module, specifically is used to utilize high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

7. a portable terminal frequency offset regulation method is used for the TD-SCDMA mobile communication system with the situation of frequently arranging net, and it is characterized in that, comprising:

Effectively co-frequency cell detects step, obtains effective co-frequency cell according to the received signal code power and the detection threshold of co-frequency cell;

Effective co-frequency cell frequency offset calculation step is calculated the frequency offset estimating value of all effective co-frequency cells;

The frequency deviation combining step obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells merged;

Frequency deviation adjusted value determining step is calculated frequency deviation adjusted value-sign (Δ f _n) * Δ S _n, wherein sign is a sign function, Δ f _nThe frequency offset estimating value that obtains for the frequency deviation combining step or the mean value of a plurality of frequency offset estimating values, Δ S _nFor frequency deviation is adjusted the factor;

The FREQUENCY CONTROL step according to frequency deviation adjustment calculation local carrier frequency, and utilizes local carrier frequency to control the local carrier frequency of voltage controlled oscillator.

8. portable terminal frequency offset regulation method according to claim 7, it is characterized in that, in the described frequency deviation combining step, adopt high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

9. according to claim 7 or 8 described portable terminal frequency offset regulation methods, it is characterized in that the received signal code power of described co-frequency cell calculates according to the intermediate code among descending synchronous code or the time slot #0.

10. according to claim 7 or 8 described portable terminal frequency offset regulation methods, it is characterized in that the following operation of the concrete execution of described effective co-frequency cell frequency offset calculation step:

In maximum channel profile window, detect the multipath information of effective co-frequency cell, then each effective diameter is carried out frequency offset estimating after, obtain the corresponding effectively frequency offset estimating value of co-frequency cell after the frequency offset estimating of each effective diameter merged.

11., it is characterized in that in the frequency deviation adjusted value determining step, frequency deviation is adjusted the factor along with the descending variation of increase of adjusting number of times according to claim 7 or 8 described portable terminal frequency offset regulation methods.

12., it is characterized in that frequency deviation is adjusted the factor and determined according to following formula according to claim 7 or 8 described portable terminal frequency offset regulation methods:

${\mathrm{\&Delta;S}}_n=\left\{\begin{array}{cc}{\mathrm{\&Delta;S}}_{n-1}*k& {\mathrm{\&Delta;f}}_n*{\mathrm{\&Delta;f}}_{n-1}>0\\ {\mathrm{\&Delta;S}}_{n-1}/k& {\mathrm{\&Delta;f}}_n*{\mathrm{\&Delta;f}}_{n-1}<0\end{array}\right.$

Wherein, Δ S _N-1For the frequency deviation of last time is adjusted the factor, Δ f _N-1With Δ f _nBe respectively last time and the final frequency offset estimating value of this portable terminal or the mean value of a plurality of final frequency offset estimating values, k is that frequency deviation is adjusted the factor variations step-length.

13. a portable terminal frequency deviation Adjustment System is used for the TD-SCDMA mobile communication system with the situation of frequently arranging net, and it is characterized in that, comprising:

Effectively the co-frequency cell detection module is used for obtaining effective co-frequency cell according to the received signal code power and the detection threshold of co-frequency cell;

Effective co-frequency cell frequency offset calculation module is used to calculate the frequency offset estimating value of all effective co-frequency cells;

Frequency deviation merges module, is used for obtaining after frequency offset estimating value with all effective co-frequency cells merges the final frequency offset estimating value of portable terminal;

Frequency deviation adjusted value determination module is used to calculate frequency deviation adjusted value-sign (Δ f _n) * Δ S _n, wherein sign is a sign function, Δ f _nThe frequency offset estimating value that obtains for the frequency deviation combining step or the mean value of a plurality of frequency offset estimating values, Δ S _nFor frequency deviation is adjusted the factor;

The frequency sum filter is used for according to frequency deviation adjustment calculation local carrier frequency, and utilizes the local carrier frequency of local carrier frequency control voltage controlled oscillator.

14. portable terminal frequency deviation Adjustment System according to claim 13, it is characterized in that, described frequency deviation merges module, specifically is used to utilize high specific to merge or equal gain combining obtains the final frequency offset estimating value of portable terminal after the frequency offset estimating value of all effective co-frequency cells is merged.

15., it is characterized in that frequency deviation is adjusted the factor and determined according to following formula according to claim 13 or 14 described portable terminal frequency deviation Adjustment System:

${\mathrm{\&Delta;S}}_n=\left\{\begin{array}{cc}{\mathrm{\&Delta;S}}_{n-1}*k& {\mathrm{\&Delta;f}}_n*{\mathrm{\&Delta;f}}_{n-1}>0\\ {\mathrm{\&Delta;S}}_{n-1}/k& {\mathrm{\&Delta;f}}_n*{\mathrm{\&Delta;f}}_{n-1}<0\end{array}\right.$

Wherein, Δ S _N-1For the frequency deviation of last time is adjusted the factor, Δ f _N-1With Δ f _nBe respectively last time and the final frequency offset estimating value of this portable terminal or the mean value of a plurality of final frequency offset estimating values, k is that frequency deviation is adjusted the factor variations step-length.

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