CN101247159A - Activation code path detecting method for multi-antenna association detecting system - Google Patents

Abstract

The present invention discloses an activation code channel detecting method which is applied on the multiple-antenna combined-detecting system, and the method comprises the following steps: A. executing channel estimating window activating detection according to the multiple-antenna channel estimation after the noise threshold detection; B. executing matched filtering respectively to each antenna according to the activation detecting result of the channel estimating window, summating the symbol of same code channel of multiple-antenna at a same window position according to the result of matched filtering, and executing interference-user non-preferred code channel activation detecting according to the summated symbols; and C. executing combined detection interference eliminating to the summated symbols according to the activation detecting result of the interference-user non-preferred code channel, and executing non-preferred code channel activation detection to the symbol executed with interference elimination. The method according to the invention leads to the reducing of the demodulating threshold at the state of no increasing the band width thereby increasing the system throughout, and at the same time the coverage of the service can be increased.

Description

A kind of activated code channel detection method that is applied to many antennas combined detection system

Technical field

The present invention relates to many antennas associated detection technique of the communications field, be meant a kind of activated code channel detection method that is applied to many antennas combined detection system especially.

Background technology

Multi-antenna technology can effectively be resisted the decline of wireless channel, improves the channel capacity of wireless channel, more and more causes people's attention in communication system.Compare with a single aerial system, utilize multi-antenna technology,, can obtain the multi-antenna diversity gain, reduce power requirement each antenna by the signal that receives on each antenna is merged at receiving terminal.In TD SDMA (TD-SCDMA) system, terminal adopts many antennas joint detection algorithm, for the high speed business of high-speed packet access (HSPA) and so on, can improve business throughput, reduce demodulation threshold, can increase Service coverage simultaneously.Therefore, the multi-antenna diversity reception technique has caused the concern of more and more equipments producer.

General in realization the combining with Space Time Coding and other multiple-input, multiple-output (MIMO) technology of existing multiaerial system carried out the space-time joint detection, can obtain diversity gain and coding gain in the space, but detection algorithm more complicated all.In the TD-SCDMA system, the base station end has used smart antenna, on realizing, system can accomplish diversity reception, but this moment antenna distance smaller (adjacent two antennas are generally 1/2 wavelength), correlation between antenna is more intense, at receiving terminal multi-antenna signal is merged reception, the diversity gain that obtains with multi-antenna diversity fully independently is much smaller, moreover smart antenna array element number is generally all more than or equal to 4, along with increasing of antenna number, complexity is how much magnitudes and increases, and this has increased the difficulty that system realizes undoubtedly.

Summary of the invention

Technical problem to be solved by this invention provides a kind of activated code channel detection method that is applied to many antennas combined detection system, make and under the situation that does not increase bandwidth, reduce demodulation threshold, thereby improve the throughput of system, can increase professional coverage simultaneously.

For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:

A kind of activated code channel detection method that is applied to many antennas combined detection system comprises the steps:

A, estimate to carry out channel estimation window according to the multi-antenna channel after noise gate detects and activate and detect;

B, activate testing result according to channel estimation window each antenna is carried out matched filtering respectively, according to the matched filtering result, symbol to the identical code channel of many antennas the same window position is sued for peace, and carries out the non-first-selected code channel activating of interference user according to the symbol power after the summation and detects;

C, detect according to the non-first-selected code channel activating of interference user and to swash the symbol of result after and carry out the joint-detection interference eliminated, carry out the non-first-selected code channel activating of user to be detected according to the symbol after the interference eliminated and detect summation.

Method of the present invention combines with joint detection algorithm, compare with existing single antenna algorithm, on channel estimation window and code channel activating algorithm, revise a little at many antennas, in conjunction with the matched filtering algorithm in the joint-detection, be easy to just realize that high specific merges when empty, and can obtain higher diversity gain, guarantee seamlessly transitting between technology simultaneously, can be used as the algorithm of device upgrade version.

Description of drawings

Fig. 1 is the handling process schematic diagram that multi-antenna diversity receives in the embodiment of the invention;

Fig. 2 is applied to the flow chart of the activated code channel detection method of many antennas combined detection system for the embodiment of the invention;

Fig. 3 is the 1st a kind of implementation method flow chart of the 1st activation detection-phase in the embodiment of the invention;

Fig. 4 is the 2nd a kind of implementation method flow chart of the 1st activation detection-phase in the embodiment of the invention;

Fig. 5 is the process chart of the 2nd activation detection-phase in the embodiment of the invention;

Fig. 6 is the process chart of the 3rd activation detection-phase in the embodiment of the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.

As shown in Figure 1, signal enters the antenna receiving terminal through different wireless channels, and in reception diversity system, the signal of different antennae after automatic gain control (AGC) adjustment unit and the processing of modulus (A/D) converter unit, obtains baseband digital signal respectively; After every roadbed band digital signal detects the reason cell processing through channel estimating unit, interference cancellation unit and noise gate successively, what resultant channel estimating entered many antennas unites the activation testing process, can make full use of the irrelevance that multi-antenna channel is estimated like this, the fading characteristic of wireless channel is played the good restraining effect.

For ease of describing, at first provide the notion of user to be detected and interference user here.

For terminal, user to be detected refers to this user, and interference user is meant the user who removes outdoor this sub-district of this usefulness and neighbor cell; For the base station, user to be detected refer in this sub-district to insert at random finish and distributing radio resource all users, interference user is meant other users of neighbor cell beyond this sub-district.

The activated code channel detection method of introducing below all is suitable for base station end and terminal.

As shown in Figure 2, the activated code channel in many antennas joint detection algorithm detects and comprises following three phases:

The 1st stage (step 201): estimate to carry out channel estimation window according to the multi-antenna channel after detecting through noise gate and activate detection;

The 2nd stage (step 202): activate testing result according to channel estimation window each antenna is carried out matched filtering respectively, according to the matched filtering result, symbol to the identical code channel of many antennas the same window position is sued for peace, and carries out the non-first-selected code channel activating of interference user according to the symbol power after the summation and detects;

The 3rd stage (step 203): detect sharp result according to the non-first-selected code channel activating of interference user the symbol after suing for peace is carried out the joint-detection interference eliminated, carry out the non-first-selected code channel activating of user to be detected according to the symbol after the interference eliminated and detect.

Activate detection-phase the 1st time:

Channel estimating h after noise gate detects ^(ka)(ka=0,1, ..., Ka-1, ka is the antenna sequence number, Ka is the antenna sum), enter the multi-antenna channel estimating window and activate the detecting unit (see figure 1), activating detection for the 1st time is that channel estimation window activates detection, activate to detect after can merging the channel estimating of many antennas and handle, also can be earlier the channel estimating of each antenna be independently detected respectively, and then judge that according to the activation that the activation situation of each antenna provides many antennas it corresponds respectively to following method one and method two.

Method one:

Enter the multi-antenna channel estimating window after channel estimating is handled through noise gate and activate detecting unit, referring to Fig. 3, upward different with the processing of single antenna receiver is, here channel estimation window power will calculate respective channels and estimates that the power after many antennas merge on the window (is called for short many antennas and merges power, the merging method can adopt methods such as high specific merging or equal gain combining), channel estimation window activates testing process and merges power based on many antennas, is described below:

Step 301～302: the many antennas that calculate each channel estimating window respectively merge power, and the most most antenna of therefrom finding out user to be detected merges window power;

The channel estimating of supposing the last many antennas of channel estimation window km is h _{Km, n} ^(ka), wherein:

Ka=0,1 ..., Ka-1, ka are the antenna sequence number, Ka is the antenna sum;

N=0,1..., W-1, n are the channel estimation window tap position, W is a channel estimating window length;

Km=0,1 ..., Kcell-1, km are the channel estimating window position, Kcell is the channel estimation window sum.

On each channel estimation window km, calculate many antennas and merge power:

$P_h^{\left(\mathrm{km}\right)}=\underset{\mathrm{ka}=0}{\overset{\mathrm{Ka}-1}{\mathrm{\Σ}}}\left(\frac{{\mathrm{\α}}_{\mathrm{ka}}\underset{n=0}{\overset{W-1}{\mathrm{\Σ}}}{\left|h_{\mathrm{km},n}^{\left(\mathrm{ka}\right)}\right|}^2}{\sqrt{\underset{\mathrm{ka}=0}{\overset{\mathrm{ka}-1}{\mathrm{\Σ}}}{\left|{\mathrm{\α}}_{\mathrm{ka}}\right|}^2}}\right)---\left(1\right)$

Here α _KaFor the gain factor of antenna ka on window km, merge for high specific ${\mathrm{\α}}_{\mathrm{ka}}=\sqrt{\underset{n=0}{\overset{W-1}{\mathrm{\Σ}}}{\left|h_{\mathrm{km},n}^{\left(\mathrm{ka}\right)}\right|}^2},$ For equal gain combining α _Ka=1.

For terminal, from this subscriber channel estimating window, find maximum many antennas to merge power, for the base station end, from all channel estimation windows of this sub-district, find maximum many antennas to merge power, be designated as P _h ^(Kmax), Kmax is the maximum power window position.

Step 303: calculate the ratio that each many antenna merges the most most antenna merging window power of window power and user to be detected respectively, be designated as:

$r_h^{\left(\mathrm{km}\right)}=\frac{P_h^{\left(\mathrm{km}\right)}}{P_h^{\left(K\max \right)}}---\left(2\right)$

Simultaneously, also can be with this power ratio r _h ^(km)Output to and activate detecting unit for the second time for activating the detection use for the second time.

Step 304: channel estimation window activates to detect to be judged;

The activation detection threshold of setting user to be detected and interference user is respectively Г _{1st, usr}And Г _{1st, int erf}(representative value is respectively

With

), carry out channel estimation window and activate the detection judgement.For user's to be detected channel estimation window, many antennas merge the ratio and the thresholding Г of power _{1st, usr}Relatively, for the channel estimation window of interference user, many antennas merge the ratio and the thresholding Г of power _{1st, int erf}Relatively, judge then that greater than threshold value this window is a state of activation, keep the channel estimation results of the many antennas of this window, otherwise, judge that this window is a unactivated state, abandon the multi-antenna channel estimated result of this window, that is:

Step 305: add up the activated code channel sum CodeActiveNum of user to be detected and interference user, described activated code channel adds up to the code channel number sum in all activated window, thinks that promptly all code channels in the theactivewindow all activate.

Step 306～309: the restriction of activated code channel number.

In joint detection algorithm, the upper limit of activated code channel number is assumed to parameters C odNumLimit, if CodeActiveNum is greater than CodNumLimit, need merge lower-powered channel estimation window to the many antennas of interference user handles, on specific implementation, to the channel estimation window of interference user be sorted according to the size that many antennas merge power, merge power order from small to large according to many antennas successively the channel estimation window of correspondence is set at un-activation, and adjust the activated code channel sum, till adjusted activated code channel sum is less than or equal to CodNumLimit first.

Method two:

At first respectively each antenna is independently activated to detect according to thresholding and judge, the code channel that activates is categorized into different set, be that code channel set 2, the interference user of public activation removed set 2 back activated code channels set 3 in the user's to be detected activated code channel set 1, the many antennas of interference user, on different sets, carry out different processing.Referring to Fig. 4, whole process is divided into following step:

Step 401～402: calculate each channel estimating window power on each antenna respectively, therefrom find out user's to be detected maximized window power;

The channel estimating of supposing the last many antennas of channel estimation window km is h _{Km, n} ^(ka), wherein:

Ka=0,1 ..., Ka-1, ka are the antenna sequence number, Ka is the antenna sum;

N=0,1..., W-1, n are the channel estimation window tap position, W is a channel estimating window length;

Km=0,1 ..., Kcell-1, km are the channel estimating window position, Kcell is the channel estimation window sum.

The power of antenna ka channel estimation window km is:

$P_h^{(\mathrm{km},\mathrm{ka})}=\underset{n=0}{\overset{W-1}{\mathrm{\Σ}}}{\left|h_{\mathrm{km},n}^{\left(\mathrm{ka}\right)}\right|}^2---\left(5\right)$

From P _h ^{(km, ka)}In find the window power P of user's maximum to be detected _h ^{(K max, ka)}, Kmax is the maximum power window position.

Step 403: calculate the ratio of the maximized window power of each channel estimating window power and user to be detected on each antenna respectively, be designated as:

$r_h^{(\mathrm{km},\mathrm{ka})}=\frac{P_h^{(\mathrm{km},\mathrm{ka})}}{P_h^{(K\max ,\mathrm{ka})}}---\left(6\right)$

Step 404: on each antenna, carry out channel estimation window respectively and activate the detection judgement;

The activation detection threshold of supposing last user to be detected of antenna ka and interference user is respectively Г _{1st, usr}And Γ _{1st, int erf}, for the purpose of the justice, Г on different antennas _{1st, usr}Identical, Γ _{1st, int erf}Also identical.

To user's to be detected channel estimation window, the ratio of channel estimation window power and thresholding Г _{1st, usr}Relatively, for the channel estimation window of interference user, the ratio of channel estimation window power and thresholding Г _{1st, int erf}Compare, judge then that greater than threshold value this window is a state of activation, keep the channel estimation results of this this antenna of window respectively, otherwise, judge that this window is a unactivated state, abandon this antenna channel estimated result of this window, that is:

Step 405: activate testing result according to channel estimation window, the activated code channel of all activated window is divided into 3 set:

Set 1: user's to be detected activated code channel set, the code channel number of remembering this set is CodUsr;

Set 2: the code channel set of interference user public activation on Ka antenna, the code channel number of remembering this set is CodActAll;

Set 3: interference user is removed the activated code channel set of the various activation situation correspondences beyond the set 2 on Ka antenna, the code channel number of remembering this set is CodActPart.

Step 406: statistics set 1 and the total CodNum of the code channel of set 2;

CodNum＝CodUsr+CodActAll (9)

Step 407～412: the restriction of activated code channel number.

In joint detection algorithm, the upper limit of activated code channel number is assumed to parameters C odNumLimit, next, whether greater than CodNumLimit, is divided into following two branches according to CodNum:

Branch one): CodNum is greater than CodNumLimit, code channel in the set 3 is set at un-activation, the channel estimation window of the code channel correspondence in the pair set 2 sorts according to the size that many antennas merge power, merge power order from small to large according to many antennas successively the channel estimation window of correspondence is set at un-activation, and adjust CodNum (be CodNum deduct be set at the code channel number that unactivated channel estimation window comprises), till adjusted CodNum is less than or equal to CodNumLimit first;

Branch two) CodNum is less than CodNumLimit, the channel estimation window of the code channel correspondence in the pair set 3 sorts according to the size that many antennas merge power, merging power order from big to small according to many antennas successively elects the channel estimation window of correspondence, and adjust CodNum (being that CodNum adds the code channel number that the channel estimation window that is selected into comprises), till adjusted CodNum is less than or equal to CodNumLimit for the last time, at this moment, the code channel of gathering the channel estimation window correspondence of not electing in 3 is set at un-activation.

With reference to Fig. 1, after the 1st activation detects and finishes, the channel estimating h on the activated code channel ^{' (ka)}(ka=0,1, ..., Ka-1, ka is the antenna sequence number, Ka is the antenna sum) output to the antenna match filter unit, entering many antennas then activates detecting unit for the second time and (activates testing result according to channel estimation window each antenna is carried out matched filtering respectively, then with the filtered result's summation of each antenna match, the high specific of promptly having realized signal when empty merges, in order to reduce the computation complexity of joint-detection interference eliminated, non-first-selected code channel for interference user will carry out the 2nd activation detection, accordingly, the result after the symbol after many antennas high specific merges and the channel estimating of activated code channel will detect according to the 2nd activation outputs to many antennas joint-detection MAI/ISI (multiple access interference/intersymbol interference) and eliminates the unit).

Activate detection-phase the 2nd time:

Filtered symbol summation carries out activating for the 2nd time detection (activation of the non-first-selected code channel of interference user detects) for many antenna match, code channel power in the detection will calculate all symbol s power after many antenna match filtering summation on the corresponding code channel, calculate the ratio of non-first-selected code channel and first-selected code channel summation symbol power then, carry out activating for the 2nd time and judge, referring to Fig. 5, may further comprise the steps:

Step 501: the first-selected code channel of interference user is set at state of activation remains,, following detection step is arranged to non-first-selected code channel:

Step 502: the interference user window is made a window earlier activate the detection judgement, method is to activate for the first time to detect the window power ratio r that has calculated _h ^(km)In find out interference user window correspondence many antennas merge power P _h ^(km)Maximum P with the many antennas merging of user to be detected power _h ^(Kmax)Ratio $r_h^{\left(\mathrm{km}\right)}=\frac{P_h^{\left(\mathrm{km}\right)}}{P_h^{\left(K\max \right)}};$

If what activate that detection-phase adopts for the 1st time is method two, then needs to calculate the many antennas of interference user window in this step and merge power $P_h^{\left(\mathrm{km}\right)}=\underset{\mathrm{ka}=0}{\overset{\mathrm{Ka}-1}{\mathrm{\Σ}}}\left(\frac{{\mathrm{\α}}_{\mathrm{ka}}\underset{n=0}{\overset{W-1}{\mathrm{\Σ}}}{\left|h_{\mathrm{km},n}^{\left(\mathrm{ka}\right)}\right|}^2}{\sqrt{\underset{\mathrm{ka}=0}{\overset{\mathrm{Ka}-1}{\mathrm{\Σ}}}{\left|{\mathrm{\α}}_{\mathrm{ka}}\right|}^2}}\right)$ Maximum P with the many antennas merging of user to be detected power _h ^(Kmax)Ratio $r_h^{\left(\mathrm{km}\right)}=\frac{P_h^{\left(\mathrm{km}\right)}}{P_h^{\left(K\max \right)}}$ (window power is the add up power of a plurality of antennas at same window here).

Step 503: judge window power ratio r _h ^(km)Whether activate detection threshold Г greater than the window of setting _WinIf,, enter step 504, otherwise, the non-first-selected code channel of this interference user channel estimating window is set at un-activation; Step 504: at the symbol that obtains after many antenna match filtering summation

(being called for short many antenna match filtering summation symbol), calculate respectively at the first-selected code channel of respective channels estimating window and the power of the summation of the many antenna match filtering on non-first-selected code channel symbol:

$P_s^{\left(\mathrm{Kr}{u}_0\right)}=\underset{n=0}{\overset{\mathrm{Ks}-1}{\mathrm{\Σ}}}{\left|\underset{\mathrm{ka}=0}{\overset{\mathrm{Ka}-1}{\mathrm{\Σ}}}{S}_{\mathrm{kr}{u}_0,n}^{\left(\mathrm{ka}\right)}\right|}^2---\left(10\right)$

$P_s^{\left(\mathrm{Kr}{u}_i\right)}=\underset{n=0}{\overset{\mathrm{Ks}-1}{\mathrm{\Σ}}}{\left|\underset{\mathrm{ka}=0}{\overset{\mathrm{Ka}-1}{\mathrm{\Σ}}}{S}_{\mathrm{kr}{u}_i,n}^{\left(\mathrm{ka}\right)}\right|}^2---\left(11\right)$

The K here _Ru0With K _Rui(i=1,2 ..., I, I represent the non-first-selected code channel sum of this channel estimation window) the first-selected code channel and the non-first-selected code channel of the corresponding channel estimating window of expression respectively, Ks is the symbolic number on each code channel.

Step 505: the ratio of many antenna match filtering summation symbol power on i non-first-selected code channel that calculating above-mentioned steps 504 obtains and the first-selected code channel:

$r_s^{\left(\mathrm{Kr}{u}_i\right)}=\frac{P_s^{\left(\mathrm{Kr}{u}_i\right)}}{P_s^{\left(\mathrm{Kr}{u}_0\right)}}---\left(12\right)$

Step 506～508: judge above-mentioned many antenna match filtering summation symbol power ratio r _s ^(Krui)Whether activate detection threshold Г greater than the 2nd time _2ndIf,, then the non-first-selected code channel with this interference user channel estimating window is set at activation, otherwise the non-first-selected code channel of this interference user channel estimating window is set at un-activation:

${h^{\′\′}}_{\mathrm{km},n}^{\left(\mathrm{ka}\right)}\left\{\begin{array}{cc}{h^{\′}}_{\mathrm{km},n}^{\left(\mathrm{ka}\right)}& r_s^{\left(\mathrm{Kr}{u}_i\right)}>{\mathrm{\Γ}}_{2\mathrm{nd}}\\ 0& r_s^{\left(\mathrm{Kr}{u}_i\right)}\≤{\mathrm{\Γ}}_{2\mathrm{nd}}\end{array}\right.---\left(13\right)$

The Г here _WinWith Г _2ndCan be optimized according to actual conditions, typical value is 1/8.

After the 2nd activation detects and finish, will activate the channel estimating h of non-first-selected code channel ^{" (ka)}And many antenna match filtering summation symbol $S=\underset{\mathrm{ka}=0}{\overset{\mathrm{Ka}-1}{\mathrm{\Σ}}}{S}_{\mathrm{kr}{u}_i,n}^{\left(\mathrm{ka}\right)}$ Output to many antennas joint-detection MAI/ISI and eliminate the unit, carry out interference eliminated.

Activate detection-phase the 3rd time:

After joint-detection was eliminated MAI, ISI and disturbed, for the situation of user's to be detected corresponding a plurality of code channels of theactivewindow, the symbol d that need obtain according to joint-detection the non-first-selected code channel of theactivewindow carried out activating for the 3rd time and detects, and as shown in Figure 6, specifically comprises:

Step 601: user's to be detected first-selected code channel is set at state of activation remains,, following detection step is arranged to non-first-selected code channel:

Step 602: calculate joint detection of users to be detected and eliminate all symbol power on first-selected code channel after MAI, ISI disturb and the non-first-selected code channel:

$P_d^{\left(\mathrm{Kr}{u}_0\right)}={\left|\underset{n=0}{\overset{\mathrm{Kd}-1}{\mathrm{\Σ}}}{d}_{\mathrm{kr}{u}_0,n}\right|}^2---\left(14\right)$

$P_d^{\left(\mathrm{Kr}{u}_i\right)}={\left|\underset{n=0}{\overset{\mathrm{Kd}-1}{\mathrm{\Σ}}}{d}_{\mathrm{kr}{u}_i,n}\right|}^2---\left(15\right)$

The Kru here ₀With Kru _i(i=1,2 ..., I, I represent the non-first-selected code channel sum of this channel estimation window) the first-selected code channel and the non-first-selected code channel of the corresponding channel estimating window of expression respectively, Kd is the symbolic number on each code channel.

Step 603: the power ratio of all symbols on i non-first-selected code channel that calculating above-mentioned steps 602 obtains and the first-selected code channel:

$r_d^{\left(\mathrm{Kr}{u}_i\right)}=\frac{P_d^{\left(\mathrm{Kr}{u}_i\right)}}{P_d^{\left(\mathrm{Kr}{u}_0\right)}}---\left(16\right)$

Step 604～606: judge power ratio r _d ^(Krui)Whether activate detection threshold Г greater than the 3rd time _3rdIf,, think that then this non-first-selected code channel activates, the symbol of exporting on this non-first-selected code channel is given demodulating unit, otherwise, think this non-first-selected code channel un-activation to abandon the symbol on this non-first-selected code channel.

The Г here _3rdCan be optimized according to actual conditions, typical value is 1/2.

Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (10)

1. an activated code channel detection method that is applied to many antennas combined detection system is characterized in that, comprises the steps:

A, estimate to carry out channel estimation window according to the multi-antenna channel after noise gate detects and activate and detect;

B, activate testing result according to channel estimation window each antenna is carried out matched filtering respectively, according to the matched filtering result, symbol to the identical code channel of many antennas the same window position is sued for peace, and carries out the non-first-selected code channel activating of interference user according to the symbol power after the summation and detects;

C, detect according to the non-first-selected code channel activating of interference user and to swash the symbol of result after and carry out the joint-detection interference eliminated, carry out the non-first-selected code channel activating of user to be detected according to the symbol after the interference eliminated and detect summation.

2. the method for claim 1 is characterized in that, steps A specifically comprises:

A11, the many antennas that calculate each channel estimating window respectively merge power, and the most most antenna of therefrom finding out user to be detected merges window power;

A12, calculate the ratio that each many antenna merges window power and the most most antenna merging window power of user to be detected respectively, with the ratio of each window correspondence with activate detection threshold for the first time and compare, if described ratio is greater than activating for the first time detection threshold, judge that then this channel estimation window is a state of activation, the channel estimation results that keeps the many antennas of this window, otherwise, judge that this channel estimation window is a unactivated state, abandons the channel estimation results of the many antennas of this window.

3. method as claimed in claim 2 is characterized in that:

In the steps A 11, it is that high specific merges power or equal gain combining power that described many antennas merge power.

4. method as claimed in claim 2 is characterized in that:

In the steps A 12, described ratio with each window correspondence with activate for the first time detection threshold and compare and be meant, compare activating detection threshold the ratio of user window correspondence to be detected and the user's to be detected first time, compare activating detection threshold the first time of the ratio of interference user window correspondence and interference user.

5. method as claimed in claim 2 is characterized in that, also comprises after the steps A 12:

At the activated code channel sum of all activated window during greater than the code channel number thresholding of joint-detection, channel estimation window to interference user sorts according to the size that many antennas merge power, merge power order from small to large according to many antennas successively the channel estimation window of correspondence is set at un-activation, and adjust the activated code channel sum, be less than or equal to first up to adjusted activated code channel sum till the code channel number thresholding of joint-detection.

6. the method for claim 1 is characterized in that, steps A specifically comprises:

A21, calculate each channel estimating window power on each antenna respectively, therefrom find out user's to be detected maximized window power;

A22, calculate the ratio of the maximized window power of each channel estimating window power and user to be detected on each antenna respectively, with the ratio of each window correspondence with activate detection threshold for the first time and compare, if described ratio is greater than activating for the first time detection threshold, judge that then this channel estimation window is a state of activation, the channel estimation results that keeps this window, otherwise, judge that this channel estimation window is a unactivated state, abandons the channel estimation results of this window.

7. method as claimed in claim 6 is characterized in that:

In the steps A 22, described ratio with each window correspondence with activate for the first time detection threshold and compare and be meant, compare activating detection threshold the ratio of user window correspondence to be detected and the user's to be detected first time, compare activating detection threshold the first time of the ratio of interference user window correspondence and interference user.

8. method as claimed in claim 6 is characterized in that, also comprises after the steps A 22:

The activated code channel of all activated window is divided into 3 set: code channel set 2, the interference user of public activation are removed the activated code channel set 3 after the set 2 on user's to be detected activated code channel set 1, the many antennas of interference user;

In set 1 with the set 2 code channel sums that comprise during greater than the code channel number thresholding of joint-detection, code channel in the set 3 is set at un-activation, the channel estimation window of the code channel correspondence in the pair set 2 sorts according to the size that many antennas merge power, merge power order from small to large according to many antennas successively the channel estimation window of correspondence is set at un-activation, and adjust the activated code channel sum, be less than or equal to first up to adjusted activated code channel sum till the code channel number thresholding of joint-detection;

In set 1 with the set 2 code channel sums that comprise during less than the code channel number thresholding of joint-detection, the channel estimation window of the code channel correspondence in the pair set 3 sorts according to the size that many antennas merge power, merging power order from big to small according to many antennas successively elects the channel estimation window of correspondence, and adjustment activated code channel sum, be less than or equal to for the last time up to adjusted activated code channel sum till the code channel number thresholding of joint-detection, at this moment, the code channel of gathering the channel estimation window correspondence of not electing in 3 is set at un-activation.

9. the method for claim 1 is characterized in that, among the step B, describedly carries out the non-first-selected code channel activating of interference user according to the symbol power after the summation and detects and specifically comprise:

The many antennas that calculate interference user channel estimating window merge the ratio of the most most antenna merging window power of power and user to be detected, this window power ratio and window activation detection threshold are compared, if being less than or equal to window, described window power ratio activates detection threshold, then the non-first-selected code channel with this interference user channel estimating window is set at un-activation, otherwise, calculate the ratio of the symbol power after the summation corresponding of symbol power after the summation of the non-first-selected code channel correspondence in this channel estimation window with first-selected code channel, compare this symbol power ratio and the second time activating detection threshold, for the second time activate detection threshold if described symbol power ratio is less than or equal to, then should be set at un-activation by non-first-selected code channel.

10. the method for claim 1 is characterized in that, among the step C, describedly carries out the non-first-selected code channel activating of user to be detected according to the symbol after the interference eliminated and detects and specifically comprise:

Calculate subscriber channel to be detected and estimate the symbol power on the non-first-selected code channel of window and the ratio of the symbol power on the first-selected code channel, with this ratio with activate detection threshold for the third time and compare, if described ratio is less than or equal to and activates detection threshold for the third time, then should be set at un-activation by non-first-selected code channel.

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