CN101136653B - Random access channel multi-path searching device and method of CDMA system - Google Patents
Random access channel multi-path searching device and method of CDMA system Download PDFInfo
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- CN101136653B CN101136653B CN200710079202XA CN200710079202A CN101136653B CN 101136653 B CN101136653 B CN 101136653B CN 200710079202X A CN200710079202X A CN 200710079202XA CN 200710079202 A CN200710079202 A CN 200710079202A CN 101136653 B CN101136653 B CN 101136653B
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Abstract
This invention discloses a multi-path search device and a method for random accessed channels in WCDMA access system, which first of all carries out precursor test and correlated and non-correlated integral and takes multiple paths P exceeding the first threshold value as the pre-selected paths, then to plug 1/4 code into the front and back of each of the multi-path in equal distance to get 3p multiple paths and then compares the non-correlated accumulated value of the control part DPCCH of random accessed channel information with a set second threshold to eliminate fake paths reported by theprecursor test ( multi-path smaller than the second threshold) and keep the multi-path exceeding the second threshold value then to select an information demodulation multi-path.
Description
Technical field
The present invention relates to the channel access technology of CDMA access system in the wireless communication technology field, relate in particular to the device and method of random access channel multi-path searching in Wideband Code Division Multiple Access (WCDMA) access (WCDMA, Wideband Code Division MultipleAccess) system.
Background technology
In the WCDMA system, when operations such as UE (User Equipment, subscriber equipment) need register, position renewal, calling, will initiate random access procedure.Random Access Channel is made up of leading and message two parts.
Leading by the signature and scrambler form.It is the signature sequence of 16 bits that 16 kinds of length are arranged, and signature sequence repeats 256 times, then, form by scrambling leading, leading long 4096chips (chip).
Message is usually at its immediate leading τ
P-mEmission after time, agreement 3GPP TS25.211 stipulates τ
P-m=15360chips or 20480chips, the time of being converted into is approximately 4 milliseconds (ms) or is 5.33 milliseconds (ms).In addition, the length of random accessing message is 10ms or 20ms.The message of 10ms is made of a frame, and the message of 20ms is made of two frames, 15 time slots of every frame, and each time slot has 2560chips.Each time slot is made of two parts, data division DPDCH (DedicatedPhysical Data Channel, Dedicated Physical Data Channel) and control section DPCCH (DPCCHDedicated Physical Control Channel, Dedicated Physical Control Channel), and data division DPDCH and control section DPCCH send simultaneously.
UE sends random access guiding at the access slot of certain distribution, Node B (B node) carries out leading search at each available access slot, signature sequence for leading permission inserts carries out Multipath searching again, and the demodulation multipath of configuration messages carries out message demodulation.
Random Access Channel is come the demodulation multipath of assignment messages part according to the multi-path location of precursor reported, because random message happens suddenly, only carry out Multipath searching and assigning process in the demodulating process of whole message, after distributing to certain signature sequence demodulation multipath, the multipath of separating timing no longer upgrades.In the real wireless environment, multipath is a stable existence, but Random Access Channel can not be as dedicated channel, multipath phase place IIR (Infinite-duration Impulse Response by each time, infinite impulse response) filtering guarantees the stability of Multipath searching, improves the multipath detection probability, reduces false footpath simultaneously, and false footpath more not only can take demodulating unit, also can influence systematic function.
Summary of the invention
Technical problem to be solved by this invention is, a kind of device and method of code division multiple access system random access channel multi-path searching is provided, realize the Multipath searching of Random Access Channel in the broadband CDMA system, in order to solve Random Access Channel when carrying out multi-path demodulation, Multipath searching poor stability, the more problem in false footpath.
The invention provides a kind of method of code division multiple access system random access channel multi-path searching, comprise the steps:
(1) carry out detection of preamble, be correlated with and irrelevant integration to leading, for every antenna, energy surpasses selection p bar preliminary election multipath the multipath of first threshold behind integration;
(2) first frame of each Transmission Time Interval TTI equally spaced respectively inserts a multipath before and after time of delay of each preliminary election multipath, and on the 3p bar multipath that obtains the Dedicated Physical Control Channel in the demodulation message;
(3) according to the Dedicated Physical Control Channel demodulation result, each the bar multipath in the described 3p bar multipath is correlated with and irrelevant integration, obtain the irrelevant accumulated value of each bar multipath in the described 3p bar multipath;
(4) from 3p irrelevant accumulated value, find maximum irrelevant accumulated value, the multipath phase place of its corresponding multipath is kept in the phase place tabulation, with each irrelevant accumulated value of remainder and second threshold ratio, keep the multipath of irrelevant accumulated value above second threshold value;
(5) from the multipath to be selected that keeps, select the multipath of an irrelevant accumulated value maximum successively, the phase value of preserving in its phase place and the phase place tabulation is compared, phase distance to each other is saved in the phase place tabulation from the multipath phase place greater than predetermined value, and to the last number of phases reaches till p in multipath or the phase place tabulation.
Described method further comprises:
(6) copy the multipath phase place of preserving in the phase place tabulation to antenna, as the message demodulation multipath.
Further, step (1) further can be divided into:
Carry out detection of preamble, for every antenna, utilize first correlation and the first irrelevant value to carry out relevant and irrelevant integration to leading, wherein, first correlation is 4096 chips, and the first irrelevant value is 1;
Made an uproar in the end * 13 product determines that as the first threshold that is used for the preliminary election multipath wherein, making an uproar in the described end is the average of removing peak value leading irrelevant integrated value afterwards;
Energy is above selecting p bar multipath as the preliminary election multipath the multipath of first threshold behind relevant and irrelevant integration.
Further, step (1) further comprises: surpass when selecting the preliminary election multipath the multipath of first threshold from energy, be less than or equal to p if energy surpasses the multipath number of first threshold, then p value is defined as the multipath number of all energy above first threshold; Otherwise p determines according to performance simulation in the step (1), wherein, and p=4.
Further, step (2) further can be divided into:
First frame of each Transmission Time Interval TTI will deduct time of delay of each preliminary election multipath a time interval, to insert a preliminary election multipath before this preliminary election multipath;
First frame of each Transmission Time Interval TTI will add time of delay of each preliminary election multipath a time interval, to insert a preliminary election multipath behind this preliminary election multipath;
On the 3p that obtains after the insertion preliminary election multipath, the Dedicated Physical Control Channel in the demodulation message;
Wherein, the described time interval is the fixed value of one 1/4 chip.
Further, step (3) further can be divided into:
According to the Dedicated Physical Control Channel demodulation result, each the bar multipath in the described 3p bar multipath is correlated with and irrelevant integration, wherein,
In the correlation intergal, correlation intergal length is 1 symbol,
In the irrelevant integration, on every multipath, for every antenna, utilize preceding 14 time slots of Dedicated Physical Control Channel demodulation result, amount to 14 * 10 symbols, carry out irrelevant integration, preceding 14 time slots that utilize the Dedicated Physical Control Channel demodulation result on each multipath, the absolute value that amounts to the demodulation result of 14 * 10 symbols adds up and obtains accumulated value, obtains p * 3 an irrelevant accumulated value altogether.
Further, second threshold value is fixed value 1.85E+5 described in the step (4); Predetermined value is 1/2 chip described in the step (5).
The present invention also provides a kind of device of code division multiple access system random access channel multi-path searching, comprise: the descrambling and de-spreading module, characteristics are, this device also comprises: detection of preamble module, preliminary election multidiameter delay processing module, multipath are selected module, described descrambling and de-spreading module selects module to be connected alternately with multipath, and be connected to the detection of preamble module through preliminary election multidiameter delay processing module, wherein
The detection of preamble module is used to carry out detection of preamble, is correlated with and irrelevant integration to leading, and energy surpasses selection p bar preliminary election multipath the multipath of first threshold behind integration, delivers to preliminary election multidiameter delay processing module;
Preliminary election multidiameter delay processing module is used for first frame at each Transmission Time Interval TTI, equally spaced respectively inserts a multipath before and after the time of delay of each preliminary election multipath, obtains 3p bar multipath;
Described descrambling and de-spreading module, the Dedicated Physical Control Channel that is used for demodulation message on described 3p bar multipath, the Dedicated Physical Control Channel demodulation result is sent to multipath select module, and be used for Dedicated Physical Data Channel being carried out demodulation in the selected back of multipath;
Multipath is selected module, be used for according to the Dedicated Physical Control Channel demodulation result, each bar multipath in the described 3p bar multipath is correlated with and irrelevant integration, obtain corresponding irrelevant accumulated value, and the multipath phase place of the irrelevant accumulated value correspondence of maximum is kept in the phase place tabulation, with each irrelevant accumulated value of remainder and second threshold ratio, keep the multipath that irrelevant accumulated value surpasses second threshold value, from the multipath to be selected that keeps, select the multipath of an irrelevant accumulated value maximum successively, the phase value of having deposited in its phase place and the phase place tabulation is compared, phase distance to each other is saved in the phase place tabulation from the multipath phase place greater than predetermined value, number of phases reaches till p in multipath or the phase place tabulation to the last, and the multipath that will select is at last indicated to the descrambling and de-spreading module and selected on the multipath the Dedicated Physical Data Channel demodulation.
Described detection of preamble module is being carried out detection of preamble when determining the preliminary election multipath, is to utilize first correlation and the first irrelevant value to carry out relevant and irrelevant integration to leading, and wherein, first correlation is 4096 chips, and the first irrelevant value is 1; Described first threshold is to make an uproar at the end * 13 product, and wherein, making an uproar in the described end is the average of removing the leading irrelevant integrated value after the peak value.Second threshold value is fixed value 1.85E+5 described in the described multipath selection module; Described phase distance to each other from predetermined value be 1/2 chip.
Second threshold ratio that the present invention utilizes the irrelevant accumulated value of control section DPCCH of Random Access Channel message and setting, reject leading multipath and detect the false footpath that reports, simultaneously, because this second threshold value has the false footpath function of rejecting precursor reported, so can suitably reduce the threshold value that the leading part multipath detects, raising improves systematic function to the detection probability in weak footpath.
Description of drawings
Fig. 1 is that Random Access Channel receiving terminal Multipath searching is realized schematic diagram in the embodiment of the invention;
Fig. 2 is Random Access Channel receiving terminal Multipath searching realization flow figure in the embodiment of the invention;
Fig. 3 is the structured flowchart of random access channel multi-path searching device in the embodiment of the invention.
Embodiment
Be described in further detail below in conjunction with the enforcement of drawings and the specific embodiments technical scheme of the present invention.
Main purpose of the present invention is to realize the Multipath searching of Random Access Channel in the broadband CDMA system, reduces false footpath, improves the stability of random access channel multi-path searching.For realizing purpose of the present invention, adopt the basic procedure structure of " following the tracks of late detection of preamble+morning+DPCCH empty footpath detection " in the present embodiment.
As shown in Figure 1, be the schematic diagram of realizing Random Access Channel receiving terminal Multipath searching in the present embodiment.Referring to Fig. 1, the thinking of present embodiment is specific as follows:
Leading (Preamble) detects some multipaths, to these multipaths be correlated with and irrelevant integration after, integral result and first threshold are compared, from greater than determining some preliminary election multipaths the multipath of first threshold, with the τ of the leading output of every preliminary election multipath
PreDistinguish forward and the value τ of a time interval 1/4chip of equally spaced backward skew with the time of delay of multipath
Pre-1/4chip, τ
Pre+ 1/4chip imports as demodulation, again with τ
Pre,τ
Pre-1/4chip, τ
Pre+ 1/4chip sends into demodulation module the DPCCH channel of message (Message) is carried out demodulation, after the demodulation DPCCH symbol of three kinds of delays is correlated with and irrelevant integration, the second threshold value G2 of the accumulated value of irrelevant integral result and setting relatively, delete the multipath that irrelevant accumulated value does not surpass the second threshold value G2, keep the multipath that surpasses the second threshold value G2, carry out multipath then and select, select message demodulation multipath τ i.
With a concrete example, come the idiographic flow of random access channel multi-path searching in the present embodiment is described below.
Among the agreement 3GPP25.141A.7 in the access procedure used witness mark channel as shown in table 1.
Table 1: insert the witness mark channel at random
| Number of diversity antennas (diversity antenna number) | 2 |
| CRC (cyclic redundancy check (CRC) code) | 16bits |
| Channel coding (chnnel coding) | Rate1/2convolutional encoding1/2 speed convolutional encoding |
| The Power ratio of preamble andmessage power ratio of message (leading with) | 0dB |
| Transport block size in bits (the bit size of transmission block) | 168(SF＝128) |
| Power ratio of control and datachannel (power ratio of control and data channel) | -2.69dB |
| Spreading factor (spreading factor) | 128 |
| Message length (message-length) | 20ms |
| Rate Matching (rate-matched) | Repetition |
| Eb/No (bit signal to noise ratio) | Total?transmitted?energy?per?user?bitd?ivided?by?noise?variance. |
| Propagation condition (propagation conditions) | Static, Multi-path Case3 static state, multipath situation 3 |
As shown in Figure 2, shown Multipath searching flow chart in this instantiation, specifically may further comprise the steps:
Step 201: carry out detection of preamble, the leading of described Random Access Channel is correlated with and irrelevant integration.
When integration, for every antenna, the first selected correlation is 4096chips, the first selected irrelevant value is 1, to carry out correlation intergal and length that length is 4096chips be 1 irrelevant integration to leading, irrelevant integrated value with all antennas adds up afterwards, is double antenna in the present embodiment, so be adding up of two irrelevant integrated values of antenna.
Step 202: set suitable multipath and detect first threshold G1, two irrelevant accumulated values of antenna surpass the multipath of selecting some in some multipaths of first threshold G1 from step 201, such as the p bar, as preliminary election multipath τ
Pre
When setting, can be made an uproar in the end * 13 (13, the parameter of determining by emulation and actual measurement according to agreement 3GPP25.141) are as the first threshold G1 of detection of preamble, wherein, can make an uproar the end of as with the average of removing the leading irrelevant integrated value after the peak value.When the multipath negligible amounts that surpasses first threshold G1, when for example being less than the p bar, then with all multipaths that surpass first threshold G1 as the preliminary election multipath, this moment, p value then was set at all multipath number above first threshold G1.
Preferably, we set 4 preliminary election multipaths of multiselect, and promptly the p value is supposed p=4 here for being less than or equal to 4.For determining of p value, can set by emulation, make number when multipath can guaranteed performance as the value of p.Multipath is many more, needs the data volume of processing big more, can consume more hardware resource, therefore, needs suitable definite p value, and can not be excessive.
Step 203: first frame of each TTI (Transmission Time Interval), respectively insert a multipath to before and after the delay of preliminary election multipath with uniformly-spaced (for example being spaced apart 1/4chip), obtaining altogether (is the bar preliminary election multipath of p * 3=12).If double antenna then can obtain p * 3 * 2 a preliminary election multipath (promptly 24) altogether, the DPCCH on these multipaths in the demodulation message; For the situation of other many antennas, then be to obtain number of antennas * p * 3 a preliminary election multipath;
Step 204: do the relevant and irrelevant integration (can regard correlation intergal length as is 1 DPCCH symbol) of DPCCH on all multipaths that in step 203, obtain, obtain p * 3 an irrelevant integral result; Wherein, utilize preceding 14 time slots of DPCCH demodulation result, reserve 10 slot times and do other processing, amount to 14 * 10 symbols, do irrelevant integration to hardware:
Wherein, S
Dpcch(a, p n) are the DPCCH demodulation result, and p (p=1,2,3,4) is the multipath sequence number of determining through detection of preamble in step 202, and a (a=1,2) is the antenna sequence number, adopts the double antenna demodulation here, n (n=1,2 ..., 140) be DPCCH symbol sequence number, r
Dpcch(p) be the irrelevant integrated value accumulation result of the multipath p that arrives of detection of preamble, altogether p * 3 (being 12 herein) irrelevant accumulated values at most; For the situation of many antennas, then be that all antennas are added up.
Step 205: select the multipath phase place of maximum irrelevant accumulated value correspondence, be kept in the phase place tabulation.Find maximum irrelevant accumulated value r in 12 irrelevant accumulated values that from step 204, obtain
Dpcch(p), the multipath phase place with its correspondence is saved in the phase place tabulation;
Step 206: judge whether have only a preliminary election multipath, judge promptly whether p is 1,, forward step 213 to the end Multipath searching, otherwise forward step 207 to if having only a preliminary election multipath;
Step 207: the remaining irrelevant accumulated value of each multipath and the second threshold value G2 compares after will picking out the multipath of energy maximum, keeps the multipath that surpasses the second threshold value G2, and deletion does not have to surpass the multipath of the second threshold value G2.
Particularly, be irrelevant accumulated value r with other multipath of remainder
Dpcch(p) and the second threshold value G2 (its value can be determined by emulation and actual measurement for 1.85E+5) relatively, remove the multipath that not have above the second threshold value G2; In the present embodiment; the second threshold value G2 has adopted fixed value 1.85E+5; because formula (1) adopts different number of antennas; as single antenna, double antenna, four antennas; adopt the relevant and irrelevant integration of different length; for example can adopt the irrelevant again integration of first correlation intergal (correlation intergal length is 1 DPCCH symbol); perhaps only use irrelevant integration; perhaps adopt certain adaptive algorithm to calculate the second threshold value G2; carry out multipath by the second threshold value G2 again and handle, also belong to protection scope of the present invention.
Step 208: judge whether to surpass the multipath of the second threshold value G2,, forward step 213 to the end Multipath searching if there is not to surpass the multipath of the second threshold value G2, otherwise, forward step 209 to;
Step 209: select the multipath of next energy maximum, promptly from surpass the multipath of the second threshold value G2, select time maximum r
Dpcch(p) Dui Ying phase place;
Step 210: the phase value of preserving in the multipath phase place that chooses in the step 209 and the tabulation is compared, whether phase distance in judging it and tabulating is greater than or equal to from a fixed value d chip, 1/2chip for example, if distance is then returned step 209 less than d chip, continue to select next maximum, otherwise forward step 211 to; Wherein, the numerical value of described d can determine by emulation, can be for example 1/4, numerical value such as chip or 1chip.
Step 211: preserve this phase place in tabulation;
Step 212: judge that this phase place is in the phase place of the multipath correspondence to be selected in last step 209 or the phase place tabulation p multipath phase place to have been arranged, whether promptly judge all phase places all travel through or tabulate in the existing individual phase place of 4 (p=4), at this moment obtain phase place p
s, words that no are returned step 209, select otherwise proceed multipath, forward step 213 to;
Step 213: Multipath searching finishes, and multipath is selected to finish, and copies the multipath phase place in the phase place tabulation to antenna, if two antennas, then double antenna is chosen 8 finger (branch refers to) p at most altogether
SaFor the double antenna demodulation.
For example, if relatively select 12 multipaths altogether with first threshold G1, sequence number is respectively:
1、2、3、4、5、6、7、8、9、10、11、12；
If 2 antennas also have 12 multipaths on the other antenna, sequence number is respectively:
13、14、15、16、17、18、19、20、21、22、23、24；
The double antenna correspondence carries out just having had only 12 multipaths after irrelevant the adding up, and sequence number is:
1、2、3、4、5、6、7、8、9、10、11、12；
After determining finally that according to the second threshold value G2 multipath is selected again, suppose that 4 multipath sequence numbers choosing are
1,5,8,11, this also is the p in the step 212
s
The demodulation branch that is assigned to two antennas like this refers to that (finger) is exactly
First antenna: 1,5,8,11;
Second antenna: 13,17,20,23.
p
SaJust be meant 1,5,8,11,13,17,20,23.
Number of antennas is to the not influence of top base band signal process flow process, just in leading relevant and irrelevant integrated value, control channel size relevant and irrelevant value changes to some extent, and the multipath after multipath is selected is to be assigned to every antenna, and is consistent with above-described double antenna multipath allocation flow.If double antenna then needs last Search Results is assigned on two antennas, if four antennas then need to be assigned on 4 antennas, handling process is the same.
Method based on above-mentioned code division multiple access system random access channel multi-path searching, when realizing, can adopt the device of code division multiple access system random access channel multi-path searching as shown in Figure 3, comprise: descrambling and de-spreading module, detection of preamble module, preliminary election multidiameter delay processing module, multipath are selected module, described descrambling and de-spreading module selects module to be connected alternately with multipath, and is connected to the detection of preamble module through preliminary election multidiameter delay processing module.Wherein,
The detection of preamble module is used to carry out detection of preamble, for every antenna, is correlated with and irrelevant integration to leading, and energy surpasses selection p bar preliminary election multipath the multipath of first threshold behind integration, delivers to preliminary election multidiameter delay processing module; During integration, the first selected correlation is 4096chips, and the first selected irrelevant value is 1, and to carry out correlation intergal and length that length is 4096chips be 1 irrelevant integration to leading, and the irrelevant integrated value with all antennas adds up afterwards; Made an uproar in the end * 13 first threshold G1 as detection of preamble, wherein, can make an uproar the end of as with the average of removing peak value leading irrelevant integrated value afterwards, the irrelevant accumulated value of all antennas is surpassed the multipath of selecting some in some multipaths of first threshold G1, such as the p bar, as preliminary election multipath τ
Pre
Preliminary election multidiameter delay processing module is used for first frame at each Transmission Time Interval TTI, equally spaced respectively inserts a multipath before and after the time of delay of each preliminary election multipath, obtains 3p bar multipath; To preliminary election multipath τ
PreDelay before and after respectively insert a multipath with uniformly-spaced (for example being spaced apart 1/4chip), obtaining altogether (is the bar preliminary election multipath of p * 3=12).If double antenna then can obtain p * 3 * 2 a preliminary election multipath (promptly 24) altogether, the DPCCH on these multipaths in the demodulation message; For the situation of other many antennas, then be to obtain number of antennas * p * 3 a preliminary election multipath.
Described descrambling and de-spreading module, the Dedicated Physical Control Channel that is used for demodulation message on described 3p bar multipath, the Dedicated Physical Control Channel demodulation result is sent to multipath select module, and be used for Dedicated Physical Data Channel being carried out demodulation in the selected back of multipath;
Multipath is selected module, be used for according to the Dedicated Physical Control Channel demodulation result, each bar multipath in the described 3p bar multipath is correlated with and irrelevant integration, obtain corresponding irrelevant accumulated value, and the multipath phase place of the irrelevant accumulated value correspondence of maximum is kept in the phase place tabulation, with each irrelevant accumulated value of remainder and second threshold ratio, the second threshold value G2 has adopted fixed value 1.85E+5, keep the multipath that irrelevant accumulated value surpasses second threshold value, from the multipath to be selected that keeps, select the multipath of an irrelevant accumulated value maximum successively, the phase value of having deposited in its phase place and the phase place tabulation is compared, phase distance to each other is saved in the phase place tabulation from the multipath phase place greater than predetermined value, number of phases reaches till p in multipath or the phase place tabulation to the last, and the multipath that will select is at last indicated to the descrambling and de-spreading module and selected on the multipath the Dedicated Physical Data Channel demodulation.
In sum, the present invention utilizes the irrelevant accumulated value of control section DPCCH of message in the Random Access Channel and second threshold value of setting to compare, reject leading multipath and detect the false footpath that reports, simultaneously, because this second threshold value has the false footpath function of rejecting precursor reported, so can suitably reduce the first threshold that the leading part multipath detects, improve detection probability to weak footpath, improve systematic function.
Claims (10)
1. the method for a code division multiple access system random access channel multi-path searching is characterized in that, comprises the steps:
(1) carry out detection of preamble, be correlated with and irrelevant integration to leading, for every antenna, energy surpasses selection p bar preliminary election multipath the multipath of first threshold behind integration;
(2) first frame of each Transmission Time Interval TTI equally spaced respectively inserts a multipath before and after time of delay of each preliminary election multipath, and on the 3p bar multipath that obtains the Dedicated Physical Control Channel in the demodulation message;
(3) according to the Dedicated Physical Control Channel demodulation result, each the bar multipath in the described 3p bar multipath is correlated with and irrelevant integration, obtain the irrelevant accumulated value of each bar multipath in the described 3p bar multipath;
(4) from 3p irrelevant accumulated value, find maximum irrelevant accumulated value, the multipath phase place of its corresponding multipath is kept in the phase place tabulation, with each irrelevant accumulated value of remainder and second threshold ratio, keep the multipath of irrelevant accumulated value above second threshold value;
(5) from the multipath to be selected that keeps, select the multipath of an irrelevant accumulated value maximum successively, the phase value of preserving in its phase place and the phase place tabulation is compared, phase distance to each other is saved in the phase place tabulation from the multipath phase place greater than predetermined value, and to the last number of phases reaches till p in multipath or the phase place tabulation.
2. the method for claim 1 is characterized in that, described method further comprises:
(6) copy the multipath phase place of preserving in the phase place tabulation to antenna, as the message demodulation multipath.
3. the method for claim 1 is characterized in that, step (1) further can be divided into:
Carry out detection of preamble, for every antenna, utilize first correlation and the first irrelevant value to carry out relevant and irrelevant integration to leading, wherein, first correlation is 4096 chips, and the first irrelevant value is 1;
Made an uproar in the end * 13 product determines that as the first threshold that is used for the preliminary election multipath wherein, making an uproar in the described end is the average of removing peak value leading irrelevant integrated value afterwards;
Energy is above selecting p bar multipath as the preliminary election multipath the multipath of first threshold behind relevant and irrelevant integration.
4. method as claimed in claim 3, it is characterized in that, step (1) further comprises: surpass when selecting the preliminary election multipath the multipath of first threshold from energy, if energy surpasses the multipath number of first threshold and is less than or equal to p, then the p value is defined as the multipath number that all energy surpass first threshold; Otherwise p determines according to performance simulation in the step (1), wherein, and p=4.
5. the method for claim 1 is characterized in that, step (2) further can be divided into:
First frame of each Transmission Time Interval TTI will deduct time of delay of each preliminary election multipath a time interval, to insert a preliminary election multipath before this preliminary election multipath;
First frame of each Transmission Time Interval TTI will add time of delay of each preliminary election multipath a time interval, to insert a preliminary election multipath behind this preliminary election multipath;
On the 3p that obtains after the insertion preliminary election multipath, the Dedicated Physical Control Channel in the demodulation message;
Wherein, the described time interval is the fixed value of one 1/4 chip.
6. the method for claim 1 is characterized in that, step (3) further can be divided into:
According to the Dedicated Physical Control Channel demodulation result, each the bar multipath in the described 3p bar multipath is correlated with and irrelevant integration, wherein,
In the correlation intergal, correlation intergal length is 1 symbol,
In the irrelevant integration, on every multipath, for every antenna, utilize preceding 14 time slots of Dedicated Physical Control Channel demodulation result, amount to 14 * 10 symbols, carry out irrelevant integration, preceding 14 time slots that utilize the Dedicated Physical Control Channel demodulation result on each multipath, the absolute value that amounts to the demodulation result of 14 * 10 symbols adds up and obtains accumulated value, obtains p * 3 an irrelevant accumulated value altogether.
7. the method for claim 1 is characterized in that, second threshold value is fixed value 1.85E+5 described in the step (4); Predetermined value is 1/2 chip described in the step (5).
8. the device of a code division multiple access system random access channel multi-path searching, comprise the descrambling and de-spreading module, it is characterized in that, this device also comprises: detection of preamble module, preliminary election multidiameter delay processing module, multipath are selected module, described descrambling and de-spreading module selects module to be connected alternately with multipath, and be connected to the detection of preamble module through preliminary election multidiameter delay processing module, wherein
The detection of preamble module is used to carry out detection of preamble, is correlated with and irrelevant integration to leading, and energy surpasses selection p bar preliminary election multipath the multipath of first threshold behind integration, delivers to preliminary election multidiameter delay processing module;
Preliminary election multidiameter delay processing module is used for first frame at each Transmission Time Interval TTI, equally spaced respectively inserts a multipath before and after the time of delay of each preliminary election multipath, obtains 3p bar multipath;
Described descrambling and de-spreading module, the Dedicated Physical Control Channel that is used for demodulation message on described 3p bar multipath, the Dedicated Physical Control Channel demodulation result is sent to multipath select module, and be used for Dedicated Physical Data Channel being carried out demodulation in the selected back of multipath;
Multipath is selected module, be used for according to the Dedicated Physical Control Channel demodulation result, each bar multipath in the described 3p bar multipath is correlated with and irrelevant integration, obtain corresponding irrelevant accumulated value, and the multipath phase place of the irrelevant accumulated value correspondence of maximum is kept in the phase place tabulation, with each irrelevant accumulated value of remainder and second threshold ratio, keep the multipath that irrelevant accumulated value surpasses second threshold value, from the multipath to be selected that keeps, select the multipath of an irrelevant accumulated value maximum successively, the phase value of having deposited in its phase place and the phase place tabulation is compared, phase distance to each other is saved in the phase place tabulation from the multipath phase place greater than predetermined value, number of phases reaches till p in multipath or the phase place tabulation to the last, and the multipath that will select is at last indicated to the descrambling and de-spreading module and selected on the multipath the Dedicated Physical Data Channel demodulation.
9. device as claimed in claim 8, it is characterized in that, described detection of preamble module is being carried out detection of preamble when determining the preliminary election multipath, be to utilize first correlation and the first irrelevant value to carry out relevant and irrelevant integration to leading, wherein, first correlation is 4096 chips, and the first irrelevant value is 1; Described first threshold is to make an uproar at the end * 13 product, and wherein, making an uproar in the described end is the average of removing the leading irrelevant integrated value after the peak value.
10. device as claimed in claim 8 is characterized in that, second threshold value is fixed value 1.85E+5 described in the described multipath selection module; Described phase distance to each other from predetermined value be 1/2 chip.
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| CN101931963B (en) * | 2009-06-18 | 2014-12-31 | 新邮通信设备有限公司 | Multi-user ranging detection and collision processing method and device |
| CN101667848B (en) * | 2009-09-30 | 2012-09-05 | 中兴通讯股份有限公司 | Method and device for multi-path searching in CDMA (code-division multiple access) system |
| CN102045084B (en) * | 2009-10-26 | 2013-12-04 | 中兴通讯股份有限公司 | Multi-path searching method and device |
| CN101931433B (en) * | 2010-08-06 | 2014-06-11 | 中兴通讯股份有限公司 | Multipath searching method and multipath searcher |
| CN102315859B (en) * | 2011-09-23 | 2014-01-22 | 华为技术有限公司 | Multi-path search method and device |
| GB2515801A (en) * | 2013-07-04 | 2015-01-07 | Sony Corp | Transmitter and receiver and methods of transmitting and receiving |
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