CN1933361A - Up inserting detection method - Google Patents

Abstract

A method for detecting uplink access includes carrying out shape filtering-sampling on received data of current sub frame in detection window of all receiving antennas to obtain detection data vector of current sub frame for each receiving antenna, weighting said vector according to estimation of interference power envelope in detection window of each receiving antenna, carrying out correlation operation on weighted vector and detected signature sequence, making multiantenna combination on obtained correlation calculation result of each receiving antenna and carrying out signature sequence identification on combined result.

Description

The method that a kind of up access detects

Technical field

The present invention relates to insert detection technique, particularly TD SDMA inserts the method that a kind of up access in (TD-SCDMA) system detects.

Background technology

The TD-SCDMA system is a synchronous cdma system of time-division, in this system, realizes strict uplink synchronous by software and frame structure design.The frame structure of TD-SCDMA system has four layers: superframe, radio frames, subframe and time slot/sign indicating number.Wherein, the long 720ms of superframe is made up of 72 radio frames, each is wireless frame length 10ms, and comprise the subframe of two 5ms.Concrete subframe structure as shown in Figure 1, the subframe of a 5ms is made up of 3 special time slots and 7 conventional time slots.3 special time slots are respectively the protection interval (GP) of the descending pilot frequency time slot (DwPTS) that continues 96 chips (chip), the uplink pilot time slot (UpPTS) that continues 160chip and lasting 96chip; In 7 conventional time slots, each conventional time slot continues 864chip.

In the design of frame structure, DwPTS is descending pilot frequency and designing synchronously, is used to launch the pilot signal of wireless base station (NodeB), also is the signal of down-going synchronous; UpPTS is ascending pilot frequency and designing synchronously, is used to launch the pilot signal of user terminal (UE), carries out uplink synchronous; GP is the protection interval, is used for avoiding the interference of the down-bound pilot frequency signal of the descending transmission of DwPTS NodeB to the UpPTS of up reception.

In the ideal case, the uplink pilot signal of system's expectation UE transmission is received by NodeB at GP and the common period of forming of UpPTS; And think that the uplink pilot signal that receives does not suffer the interference of self and adjacent NodeB down-bound pilot frequency signal.But in actual conditions, the uplink pilot signal that NodeB receives suffers the interference of self and adjacent NodeB down-bound pilot frequency signal probably.Present up access testing process has been ignored the existence of this interference, therefore causes the access performance of TD-SCDMA system to worsen, and especially when existing than strong jamming, access performance seriously descends.

Fig. 2 is the particular flow sheet of up access detection method in the present TD-SCDMA system.As shown in Figure 2, this method comprises:

Step 201, all reception antennas receive data in detection window, the data that every reception antenna is received, utilize formed filter to carry out filtering to receiving data, and according to spreading rate sampling, 256 complex datas of taking out corresponding GP and UpPTS promptly constitute the detection data vector of this reception antenna.

In the present up access detection algorithm, detection window is defined as the GP+UpPTS period.In this step, comprise the corresponding constantly detection data of each chip in the detection window in the detection data vector that obtains, totally 256.Some chip therein may be subjected to the interference of uplink pilot signal constantly, causes in the corresponding constantly detection data of these chips to comprise the part interference signal component.

Step 202, with the detection data vector of every reception antenna respectively with detected signature sequence, promptly SYNC_UL carries out related calculation.

Step 203, the correlated results that all reception antennas are obtained carries out many antennas merging.

Step 204, the result that many antennas are merged discerns through the signature sequence recognizer, obtains up access testing result.

So far, the flow process of up access detection finishes.

By above-mentioned flow process as can be seen, in present up access detection algorithm, detection data vector through obtaining after molding filtration and the sampling in the step 201 directly is used for carrying out related operation and follow-up many antennas merging and signature sequence identification with signature sequence.Under this flow process, when the GP+UpPTS period of system, quilt was than strong jamming, also be that some interior chip of detection window is subjected to constantly than strong jamming, then also just comprised stronger interference signal composition in the detection data vector that obtains after molding filtration and the sampling with in the constantly corresponding detection data of these chips that are interfered, utilize such detection data vector to carry out follow-up related operation, the up access testing result that obtains after many antennas merging and the signature sequence identification has also just been introduced stronger interference, make up access detect degradation, have a strong impact on the access performance of system.

Summary of the invention

In view of this, the invention provides the method that a kind of up access detects, can realize resisting the up access detection that down-bound pilot frequency signal is disturbed, the up access that improves system detects performance.

For achieving the above object, the present invention adopts following technical scheme:

The method that a kind of up access detects comprises:

A, the reception data of the current subframe that is positioned at detection window of all reception antennas are carried out molding filtration and sampling, obtain the detection data vector of the current subframe of each reception antenna;

B, according to the estimation of interference power envelope in the detection window on each reception antenna, the detection data vector of the current subframe of each reception antenna is weighted;

C, detection data vector after the weighting of corresponding each reception antenna and detected signature sequence are carried out related calculation; And the related operation result of all reception antennas that will obtain carries out many antennas and merges, and is combined the result and carries out signature sequence identification.

Preferably, detection window described in the step a can be the random time section that possible receive uplink pilot signal.

Preferably; the described random time section that may receive uplink pilot signal can for: by protection at interval and time period of constituting of uplink pilot time slot; perhaps, by protecting interval and uplink pilot time slot and following the time period that uplink pilot time slot first conventional time slot afterwards constitutes closely.

Preferably, the envelope of interference power described in the step b is estimated and can be estimated or the interference power envelope of the last subframe of current subframe is estimated for, the interference power envelope of current subframe.

Preferably, when described interference power envelope was estimated as the interference power envelope estimation of current subframe, described basis can be carried out behind step a the estimation of interference power envelope in the detection window on the reception antenna.

Preferably, when the interference power envelope that is estimated as the last subframe of current subframe when described interference power envelope was estimated, described basis can be carried out before step a the estimation of interference power envelope in the detection window on the reception antenna.

Preferably, may further include among the step b: estimate the interference power envelope of current subframe in the detection window, and estimated result is stored, be used for the estimation of the interference power envelope of next subframe in the detection window.

Preferably, described in the step b to the estimation of interference power envelope in the detection window on each reception antenna can for:

$P_{N\×1}^k\left(t\right)=y^{*}\left(t\right).\×y\left(t\right)$

P ^k(t)＝βP ^k(t)+(1-β) P ^k(t-1)

Wherein, t carries out the subframe numbers that the interference power envelope is estimated in the detection window, k is the reception antenna index, Pk (t) is that the interior interference power envelope of the t subframe detection window of k root reception antenna is estimated, y (t) is the detection data vector of t subframe, (. *) expression is multiplied each other the element correspondence of vector and is obtained new vector, and * represents conjugate operation; β be one smaller or equal to 1 arithmetic number.

Preferably, predetermined threshold, described in the step b to the detection data vector of the current subframe of each reception antenna be weighted can for:

Each chip interference power estimated value and predefined thresholding constantly in the detection window compared, if certain chip interference power estimated value constantly is greater than predefined thresholding, then will detect the weighted value of the detection data of this chip moment correspondence in the data vector and put 0, if certain chip interference power estimated value constantly is less than or equal to predefined thresholding, then carry out the non-zero weighting to detecting the detection data that this chip is corresponding constantly in the data vector.

Preferably, described to detect this chip is corresponding constantly in the data vector detection data carry out the non-zero weighting can for: $w^k\left(n\right)={\left({\stackrel{\‾}{P}}_t^k\right)}^{-\frac{1}{2}},$ Wherein, t is the subframe numbers that the interference power envelope is estimated in the detection window, and n is a chip index value constantly, w ^k(n) for detecting in the data vector weight coefficient of the detection data corresponding, P with n chip moment in the detection window _t ^k(n) be with detection window in the constantly corresponding interference power estimated value of n chip.

As seen from the above technical solution, in the up access detection method of the present invention,, utilize the estimation of interference power envelope in the detection window to be weighted, to suppress to detect the interference that exists in the data vector to through molding filtration and the detection data vector that sampling obtains; Utilize detection data vector after the weighting to carry out follow-up related operation again, many antennas merge and signature sequence identification, thereby obtain up access testing result.Owing to suppressed interference through in the detection data vector of weighting, therefore in the testing result of carrying out after related operation, many antennas merge signature sequence identification, also just suppressed the influence of disturbing, improve up access greatly and detected performance, and then improved the detection performance of whole system.

Description of drawings

Fig. 1 is the subframe structure of TD-SCDMA system.

Fig. 2 is the particular flow sheet that up access detects in the present TD-SCDMA system.

Fig. 3 is the overview flow chart of up access detection method among the present invention.

Fig. 4 is the particular flow sheet of up access detection method in the embodiment of the invention.

Fig. 5 utilizes Fig. 4 and method shown in Figure 2 to carry out the access performance comparison diagram that up access detects.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the specific embodiment of the present invention is described below in conjunction with the accompanying drawing embodiment that develops simultaneously.

Basic thought of the present invention is: to through molding filtration and the detection data that sampling obtains, carry out the estimation of interference power envelope, utilize the estimation of interference power envelope in the detection window to be weighted, to suppress to detect the interference that exists in the data vector; Utilize detection data vector after the weighting to carry out follow-up related operation again, many antennas merge and signature sequence identification, thereby obtain up access testing result.

Fig. 3 is the overview flow chart of up access detection method among the present invention.As shown in Figure 3, this method comprises:

Step 301 is carried out molding filtration and sampling to the current subframe reception data that are positioned at detection window of all reception antennas, obtains the detection data vector of the current subframe of each reception antenna;

Step 302 according to the estimation to interference power envelope in the detection window on the reception antenna, is weighted the detection data vector of current subframe;

Step 303 carries out related calculation detection data vector after the weighting of corresponding each reception antenna and detected signature sequence; And the related operation result of all reception antennas that will obtain carries out many antennas and merges, and is combined the result and carries out signature sequence identification.

Above-mentioned is overview to up access detection method among the present invention.Below in conjunction with embodiment the present invention is described in further detail.

In embodiments of the present invention, the definition of up access detection window can be not limited to the period of 256 chips of GP+UpPTS, can expand to the random time section that NodeB may receive uplink pilot signal, as the GP+UpPTS+TS1 period, wherein, the TS1 time slot is a conventional time slot that follows the UpPTS time slot in the subframe structure closely.

In the described step 302 of above-mentioned Fig. 3, to detecting the estimation of the interference power envelope that utilizes when data vector is weighted, can be that the current interference power envelope that carries out the subframe that up access detects is estimated, also can be that the current interference power envelope that carries out the last subframe of the subframe that up access detects is estimated.The following examples are promptly to estimate to carry out to the interference power envelope of current subframe.

Up access detects and is one and inserts testing process at random, carries out once every several subframes, wherein, for certain up access testing process, is used to carry out the subframe that up access detects and is called current subframe.

Fig. 4 is the particular flow sheet of up access detection method in the embodiment of the invention.As shown in Figure 4, this method comprises:

Step 401, every reception antenna receives the data of current subframe in detection window, utilize formed filter to carry out filtering to receiving data, and according to the spreading rate sampling, take out and detect data vector.

It is identical with existing up access detection method shown in Figure 2 to extract the method that detects data vector in this step.Suppose that carrying out up access in the t subframe detects, then the t subframe is current subframe, the following expression of detection data vector that obtains:

$y_{N\×1}^k\left(t\right)={\left[\begin{array}{cccc}{y}_t^k\left(1\right)& y_t^k\left(2\right)& ...& y_t^k\left(N\right)\end{array}\right]}^T---\left(1\right)$

Wherein, k is the reception antenna index, y _{N * 1} ^k(t) be the detection data vector on the k root reception antenna in the t subframe, y _t ^k(n) be interior k the chip of detection window detection data constantly on the k root reception antenna, N is the length of detection window.

Step 402 according to the detection data vector on the every reception antenna, is estimated the interference power envelope of current subframe in the detection window on this antenna.

Corresponding k root antenna, according to detect data carry out mode that the interference power envelope estimates can for:

$P_{N\×1}^k\left(t\right)={\left[\begin{array}{cccc}{p}_t^k\left(1\right)& p_t^k\left(2\right)& ...& p_t^k\left(N\right)\end{array}\right]}^T$

${=y}^{*}\left(t\right).\×y\left(t\right)$

${\stackrel{\‾}{P}}^k\left(t\right)={\left[\begin{array}{cccc}{\stackrel{\‾}{p}}_t^k\left(1\right)& {\stackrel{\‾}{p}}_t^k\left(2\right)& ...& {\stackrel{\‾}{p}}_t^k\left(N\right)\end{array}\right]}^T$

$=\mathrm{\β}{P}^k\left(t\right)+(1-\mathrm{\β}){\stackrel{\‾}{P}}^k(t-1)---\left(2\right)$

Wherein, P ^k(t) be the interference power envelope estimation of k root reception antenna, p _t ^k(n) be n interference power envelope estimated value that chip is corresponding constantly in the detection window, (. *) represented that the element correspondence with vector multiplies each other and obtains new vector, and * represents conjugate operation; β is one and is known as forgetting factor smaller or equal to 1 arithmetic number, and when it was illustrated in the t subframe and carries out up access and detect, the interference power envelope of its last subframe was estimated this subframe interference power envelope estimation effect degree.When t=1, when promptly for the first time certain user terminal being carried out up access and detects, P ^k(1)=β P ^k(1).

By formula (2) as can be seen, for the t subframe, its interference power envelope estimates to estimate it is relevant with the interference power envelope of this subframe other subframe before.Therefore, in the present embodiment,, the interference power envelope of this subframe is estimated still will carry out for not carrying out the subframe that up access detects.When receiving a subframe at every turn, no matter whether carrying out up access in this subframe detects, all to estimate, promptly interference power envelope estimated result once be upgraded, and write down the estimation that this estimated result is used for next interference power envelope the interference power envelope of this subframe.

Step 403 according to the interference power envelope estimated result of the every reception antenna that obtains in the step 402, is weighted the detection data vector of every reception antenna, disturbs suppressing.

In the present embodiment, the mode that all reception antennas are weighted is all identical, is that example illustrates concrete weighting scheme with k root reception antenna.

For the detection data vector that obtains in the step 401, when its some chip was subjected to strong jamming constantly, these chips are the estimated value p of corresponding interference power envelope constantly _t ^k(n) can be more outstanding.In interference power envelope estimated result, can distinguish the estimated value of this type of interference power envelope, and find its corresponding chip constantly, so just can the detection data that this chip is corresponding constantly shield, avoid it to participate in follow-up operations such as related operation, to suppress the interference constantly of these chips.

Concrete distinguish the chip mode constantly that is interfered can for: preestablish a thresholding, each chip interference power values and predefined thresholding constantly in the detection window compared, when certain chip interference power values constantly during greater than predefined thresholding, show that then this chip has been subjected to strong jamming constantly, need be with this corresponding detection data dump of chip moment in detecting data vector, so will to should chip constantly detection data zero setting, to eliminate the influence of disturbing; When certain chip interference power values constantly is less than or equal to predefined thresholding, show that then this chip constantly is not subjected to strong jamming, can keep this chip detection data value constantly constant or carry out the non-zero weighting to detecting data according to this chip interference power values constantly.

In the present embodiment, adopt the interference power values and the predefined thresholding in each chip moment of current t subframe in the detection window to compare, thereby the detection data vector of t subframe is weighted.More specifically, can utilize following formula be weighted into:

$w^k\left(n\right)=\left\{\begin{array}{c}0,{\stackrel{\‾}{P}}_t^k\left(n\right)>\mathrm{thre}\\ w_{N\×1}^k={\left({\stackrel{\‾}{P}}_t^k\left(n\right)\right)}^{-\frac{1}{2}},{\stackrel{\‾}{P}}_t^k\left(n\right)\≤\mathrm{thre}\end{array}---\left(3\right)\right.$

${\tilde{y}}_{N\×1}^k=w_{N\×1}^k.\×y_{N\×1}^k$

Wherein, thre is predefined threshold value, w ^k(n) be n chip weighted value constantly in the interior current t subframe of detection window, $w_{N\×1}^k={\left[\begin{array}{cccc}{w}^k\left(1\right)& w^k\left(2\right)& ......& w^k\left(N\right)\end{array}\right]}^T$ Be the weight vectors of k root reception antenna, P _t ^k(n) be n chip interference power values constantly in the interior current t subframe of detection window,

It is the detection data vector after the weighting on the k root reception antenna.Under this weighting scheme, certain chip interference power values P constantly of t subframe in detection window _t ^kDuring (n) greater than predefined thresholding thre, show that this chip has been subjected to strong jamming constantly, need be with this corresponding detection data dump of chip moment in detecting data vector, then put 0, and then make in the detection data vector after the weighting to should chip detection data constantly being 0 by weight coefficient that this chip is corresponding constantly; As certain chip interference power values P constantly _t ^kDuring (n) smaller or equal to predefined thresholding thre, show that then this chip constantly is not subjected to strong jamming, utilize the coefficient shown in the formula (3) that this chip detection data constantly are weighted.

After using above-mentioned method of weighting, just can from detect data vector, shield detecting the detection data that are subjected to strongly disturbing chip moment correspondence in the data vector, can suppress the interference in the up testing process, the detection data that are eliminated after disturbing are proceeded subsequent operation.

Step 404, with detection data after the weighting and detected signature sequence, promptly SYNC_UL carries out related calculation.

Step 405, the correlated results that all reception antennas are obtained carries out many antennas merging.

Step 406, the result that many antennas are merged discerns through the signature sequence recognizer, obtains up access testing result.

So far, the flow process that up access detects in the present embodiment finishes.

In the above-described embodiment, carry out according to sequencing to the interference power envelope estimation of current subframe in the detection window with to the operation that the detection vector is weighted.Particularly, when in step 403, the detection data vector of current subframe being weighted, utilizing that the interference power envelope estimated result of current subframe carries out in the detection window, also be the result that the execution of step 403 has used step 402, so step 402 and 403 is that order is carried out.

Compare with the execution mode in the foregoing description, this moment the interference power envelope of current subframe in the detection window is estimated and can also be with other order or executed in parallel detecting the operation that vector is weighted.Owing to carry out the interference power envelope when estimating, be to adopt recursive mode to converge to a certain power gradually, when therefore the detection data vector of current subframe being weighted, also can utilize the interference power envelope estimated result of the last subframe of current subframe to carry out.

When the interference power envelope that utilizes the last subframe of current subframe estimates that detection data vector to current subframe is weighted, different with embodiment shown in Figure 4 is, when the t subframe is carried out up access and is detected, the execution of step 403 is exactly the last subframe according to storage, be that the interference power envelope result of (t-1) subframe carries out in the detection window, rather than the result of step 402, therefore the execution of step 403 needn't be subject to step 402, and step 402 and 403 can executed in parallel or carried out with reverse order.

Particularly, in this embodiment, need take a step forward in step 401 and comprise: to the last subframe of current t subframe, promptly the interference power envelope of (t-1) subframe is estimated, its estimation procedure can utilize the method in the step 402 of above-mentioned Fig. 4 to carry out, and this estimated result stored, be used for the detection data vector of current t subframe is weighted.

The formula that in step 403, the detection data vector of current t subframe is weighted can for,

$w^k\left(n\right)=\left\{\begin{array}{c}0,{\stackrel{\‾}{P}}_t^k\left(n\right)>\mathrm{thre}\\ w_{N\×1}^k={\left({\stackrel{\‾}{P}}_t^k\left(n\right)\right)}^{-\frac{1}{2}},{\stackrel{\‾}{P}}_t^k\left(n\right)\≤\mathrm{thre}\end{array}\right.$

${\tilde{y}}_{N\×1}^k=w_{N\×1}^k.\×y_{N\×1}^k$

Wherein, thre is predefined threshold value, w ^k(n) be n the chip weighted value constantly of current t subframe in the detection window, $w_{N\×1}^k={\left[\begin{array}{cccc}{w}^k\left(1\right)& w^k\left(2\right)& ......& w^k\left(N\right)\end{array}\right]}^T$ Be the weight vectors of k root reception antenna,

Be the detection data vector after the weighting on the k root reception antenna, P _T-1 ^k(n) be n the chip interference power values constantly of (t-1) subframe in the detection window.Wherein, (t-1) the interference power envelope of subframe is estimated P ^k(t-1), carry out obtaining and storing when the interference power envelope is estimated in (t-1) subframe.

Carry out in the step 402 remaining when the interference power envelope is estimated current t subframe is carried out, and the interference power envelope estimated result that it obtains is stored, the interference power envelope that is used for next subframe is estimated.

By above-mentioned flow process as seen, the specific embodiment of the present invention is when having kept existing up access detection method framework flow process substantially, utilization is weighted detecting data to the estimation of interference power envelope with based on this estimation, realized the interference eliminated in the up access testing process, effectively the raising system inserts the antijamming capability that detects, and has improved the detection performance of system.

Below by with the emulation comparative illustration embodiment of the invention of prior art in the effect of up access detection method.In the TD-SCDMA system of one eight transmit antennas, a reception antenna, application drawing 4 and method shown in Figure 2 are carried out up access detection respectively, setting detection window is the GP+UpPTS period, is y through the detection data vector that obtains after molding filtration and the sampling then _{256 * 1}(t)=[y _t(1) y _t(2) ... y _t(256)] ^T

In Fig. 5, the curve 501 expression GP+UpPTS periods are not subjected to the DwPTS period when disturbing, the signal to noise ratio of system and the graph of a relation of detection probability; Curve 502 and 503 represents that respectively the GP+UpPTS period is subjected to the DwPTS period when disturbing, the signal to noise ratio of system and the graph of a relation of detection probability when utilizing Fig. 4 and method shown in Figure 2 to carry out up access to detect.

When utilizing method shown in Figure 4 to carry out up access to detect, to detecting data vector y _{256 * 1}(t) carry out the interference power envelope and estimate, specifically utilize formula (2) to obtain interference power envelope estimated result P _{256 * 1} ^k(t); Utilize the strong jamming chip weight coefficient constantly that exceeds threshold value is put 0, all the other chips weight coefficient constantly puts 1, is weighted detecting data vector; Utilize detection data vector after the weighting to carry out related operation at last, many antennas merge and signature sequence identification, and then obtain the result shown in the curve 502 among Fig. 5.

When utilizing method shown in Figure 2 to carry out up access to detect, be directly to utilize to detect data vector y _{256 * 1}(t) carry out related operation, the merging of many antennas and signature sequence identification, and then obtain the result shown in the curve 503 among Fig. 5.

As seen from Figure 5, when segment signal disturbs when the GP+UpPTS period is subjected to DwPTS, utilize the method for the embodiment of the invention can obtain higher detection probability, and along with the reinforcement of disturbing, be the reduction of signal to noise ratio, the embodiment of the invention improves big more with respect to the performance of method shown in Figure 2.

Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1, a kind of method of up access detection is characterized in that this method comprises:

A, the reception data of the current subframe that is positioned at detection window of all reception antennas are carried out molding filtration and sampling, obtain the detection data vector of the current subframe of each reception antenna;

B, according to the estimation of interference power envelope in the detection window on each reception antenna, the detection data vector of the current subframe of each reception antenna is weighted;

C, detection data vector after the weighting of corresponding each reception antenna and detected signature sequence are carried out related calculation; And the related operation result of all reception antennas that will obtain carries out many antennas and merges, and is combined the result and carries out signature sequence identification.

2, method according to claim 1 is characterized in that, detection window described in the step a is: the random time section that may receive uplink pilot signal.

3, method according to claim 2; it is characterized in that; the described random time section that may receive uplink pilot signal is: by the time period of protecting at interval and uplink pilot time slot constitutes; perhaps, by protecting interval and uplink pilot time slot and following the time period that uplink pilot time slot first conventional time slot afterwards constitutes closely.

4, method according to claim 1 is characterized in that, the envelope of interference power described in the step b is estimated as, and the interference power envelope of current subframe is estimated or the last subframe interference power envelope of current subframe is estimated.

5, method according to claim 4 is characterized in that, when described interference power envelope was estimated as the interference power envelope estimation of current subframe, described basis was carried out behind step a the estimation of interference power envelope in the detection window on the reception antenna.

6, method according to claim 4, it is characterized in that, when the interference power envelope that is estimated as the last subframe of current subframe when described interference power envelope was estimated, described basis was carried out before step a the estimation of interference power envelope in the detection window on the reception antenna.

7, method according to claim 6 is characterized in that, further comprises among the step b: estimate the interference power envelope of current subframe in the detection window, and estimated result is stored, be used for the estimation of the interference power envelope of next subframe in the detection window.

8, according to any described method in the claim 5 to 7, it is characterized in that described being estimated as to interference power envelope in the detection window on each reception antenna:

$P_{N\×1}^k\left(t\right)=y^{*}\left(t\right).\×y\left(t\right)$

P ^k(t)＝βP ^k(t)+(1-β) P ^k(t-1)

Wherein, t carries out the subframe numbers that the interference power envelope is estimated in the detection window, k is the reception antenna index, Pk (t) is that the interior interference power envelope of the t subframe detection window of k root reception antenna is estimated, y (t) is the detection data vector of t subframe, (. *) expression is multiplied each other the element correspondence of vector and is obtained new vector, and * represents conjugate operation; β be one smaller or equal to 1 arithmetic number.

9, method according to claim 1 is characterized in that, predetermined threshold, described in the step b to the detection data vector of the current subframe of each reception antenna be weighted into:

Each chip interference power estimated value and predefined thresholding constantly in the detection window compared, if certain chip interference power estimated value constantly is greater than predefined thresholding, then will detect the weighted value of the detection data of this chip moment correspondence in the data vector and put 0, if certain chip interference power estimated value constantly is less than or equal to predefined thresholding, then carry out the non-zero weighting to detecting the detection data that this chip is corresponding constantly in the data vector.

10, method according to claim 9 is characterized in that, describedly carries out non-zero and is weighted to detecting this chip is corresponding constantly in the data vector detection data: $w^k\left(n\right)={\left({\stackrel{\‾}{P}}_t^k\left(n\right)\right)}^{-\frac{1}{2}},$ Wherein, t is the subframe numbers that the interference power envelope is estimated in the detection window, and n is a chip index value constantly, w ^k(n) for detecting in the data vector weight coefficient of the detection data corresponding, P with n chip moment in the detection window _t ^k(n) be with detection window in the constantly corresponding interference power estimated value of n chip.

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