CN100425015C - Homology type detecting and decoding method and device - Google Patents
Homology type detecting and decoding method and device Download PDFInfo
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- CN100425015C CN100425015C CNB021202028A CN02120202A CN100425015C CN 100425015 C CN100425015 C CN 100425015C CN B021202028 A CNB021202028 A CN B021202028A CN 02120202 A CN02120202 A CN 02120202A CN 100425015 C CN100425015 C CN 100425015C
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Abstract
The present invention discloses a detecting and decoding method which is applied to a second stage of a cell search of a code division multitask receiving system for detecting secondary synchronous codes of an entering signal from a base station. The detecting and decoding method mainly comprises the following steps that the relevant values of the secondary synchronous codes are calculated in homology, wherein the relevant values are obtained by detecting inner codes and outer codes which are designed by aiming at all the secondary synchronous codes; the maximal relevant value as a secondary synchronous code detected by each time slot is selected on each time slot to form a code word; after the reception of the whole code word or part of the code word is completed, homology weighting type continuous Reid-Solomon codes are used for decoding the code word for obtaining the synchronization of a code group and a code frame of the entering signal. The present invention also discloses a detecting and decoding device which is used for realizing the detecting and decoding method of the present invention.
Description
Technical field
The present invention is used for the communication system decode procedure relevant for a kind of detection and interpretation method and device.More be particularly to a kind of detection and interpretation method and device, be used for third generation cooperative programme (3
RdGeneration Partnership Project, 3GPP) (widebandcode division multiple access is in cell search W-CDMA) (cell search) in the Wideband-CDMA system.This method and apparatus uses detection of phase dry type and relevant weighting type free of discontinuities Reed Solomon code, and (comma-free Reed Solomon code, decoding CFRS) can effectively promote usefulness.
Background technology
The demal multitask of use one direct sequence spread spectrum code division multiple access (direct sequence spread spectrumcode division multiple access) technology accesses sub-district formula system (cellular systems) increases channel capacity significantly.The attention that suction phase is worked as in nearest mobile communcations system research of this system.Generally speaking, because utilization again (frequencyreuse) character of frequency, the bandwidth efficiency of code division multiple access system (bandwidth efficiency) is more superior compared with other multitask access system (accessing and time division multiple access as frequency division multi-task).In addition, plot planning (cell planning) is quite simple at code division multiple access system.Therefore, the demal multitask accesses the main flow that cell system will be future.Particularly third generation cooperative programme (3
RdGenerationPartnership Project, 3GPP) the wide band code division multitask access/Frequency Division Duplexing (FDD) (W-CDMA/FDD) system has been used in one of standard of a kind of IMT-2000 of being used for third generation system.
In the sub-district formula system that a demal multitask accesses, (userequipment UE) is called as " cell search " (cellsearch) as the method system of searching best cell by user's set.Cell search is extremely important fast, in order to reduce this user's set start (initial search time of delay (switched-on delay), initial search), increase standby (standbytime) (idle state search, idle mode search) and at switching (handover) (operate condition search, active mode search) keep the good communication link quality.
Now please refer to Fig. 1, this figure will help to understand third generation cooperative programme (3GPP) wide band code division multitask and access/frame structure (frame structure) of frequency division multi-task system.At first, wide band code division multitask in third generation cooperative programme (3GPP) accesses/the frequency division multi-task system in, generally speaking cell search relies on three phases (three stages) to be finished, this three stage comprises two specially designed synchronizing channel (synchronization channel, SCH) and Common Pilot Channel (common pilot channel, CPICH).In the phase I 110, (primary synchronization channel, PSCH) 111 are used for time slot (slot) synchronously to elementary synchronizing channel.This elementary synchronizing channel 111 includes elementary synchronous code, and (primary synchronizationcode PSC) is defined as ac
p, the diversity that wherein " a " (=± 1) depends on the base station transmits (diversitytransmission) and whether exists and decide.In second stage 120, (secondary synchronization channel, SSCH) 121 are used for frame/code group (frame/codegroup) identification to the secondary synchronization channel.This secondary synchronization channel 121 includes the secondary synchronization sign indicating number, and (secondarysynchronization code SSCs) is defined as ac
s, wherein coefficient a is equal to the coefficient of elementary synchronizing channel.In the phase III 130, this Common Pilot Channel 131 is used for the decision of descending scrambler (downlink scrambling code).As shown in the figure, in 10 milliseconds of (ms) frames (radioframe), comprise 15 time slots, and because used the speed of per second 3.84 1,000,000 chips (Mchips/sec) in this system.Therefore, comprise 38400 chips (chips) in each frame, just comprise 2560 chips in each time slot.In addition, this elementary synchronizing channel and this secondary synchronization channel length comprise 256 chips and only transmit at the beginning of this boundary of time slot.
In recent years, it is revealed to be used for fast cell search (cellsearch) method of the sub-district formula system that the demal multitask accesses.See No. the 6th, 185,244, United States Patent (USP) number awarding to people such as Nystrom, its title for " cell search accesses communication system in the demal multitask " (Cellsearching in a CDMA communications system).See the United States Patent (USP) the 6th of awarding to people such as Kim, 289, No. 007, its title for " one access the method that cell base station is searched in the acquisition of mobile communcations system in asynchronous demal multitask " (Method for Acquiring A Cell SiteStation in Asynchronous CDMA Cellular Communication Systems).And see the United States Patent (USP) the 6th of awarding to people such as Shou, 038, No. 250, its title for " the demal multitask of initialization synchronized method and direct sequence type accesses the receiver of trunk desk asynchronous cell system " (Initial Synchronization Method And Receiver for DS-CDMA InterBase Station Asynchronous Cellular System).Yet because frequency shift (FS) (frequency offset) comes from the frequency instability of the crystal oscillator of user's set, for user's set, promptly this entering signal carrier frequency may have the side-play amount of frequency, therefore causes frequency shift (FS).
In the past, the secondary synchronization checkout gear that is used for the cell search second stage, roughly can be distinguished into two-stage: (1) secondary synchronization sign indicating number matched filter (secondary synchronizationcode matched filter), be used to detect this secondary synchronization sign indicating number and (2) decoder, carry out decode procedure according to the detected code word of secondary synchronization sign indicating number matched filter.Wherein secondary synchronization sign indicating number matched filter adopts incoherent coherent structure (non-coherent structure) to carry out the usefulness decay that causes with contrary frequency skew and multi-path fading channel (multipath fading channel).This technology is found in Y.P.E.Wang and T.Ottosson, " Initial frequencyacquisition in W-CDMA, " IEEE Proc.VTC ' 99, Vol.2, pp.1013-1017, Sept.1999.In addition, partly be broadly divided into soft decision type (Soft Decision) and rigid decision type (Hard Decision) mode at decoder.Yet the decoder of soft decision type (Soft Decision) needs a large amount of computings, thereby has increased the complexity of device.So Chinese rice correlator (Hamming correlator) of the rigid decision type of general normal employing (Hard Decision).This Chinese rice correlator design makes complexity relatively low, but its usefulness is also relatively poor.
Summary of the invention
Main purpose of the present invention provides a kind of detection and interpretation method, the cell search that is used for code division multiple access system, more be used in particular for the second stage of the cell search of Wideband-CDMA system, adopt the decoded mode of phase dry type detection method and relevant weighting type free of discontinuities Reed Solomon code can reduce system's medium frequency deviation effect and multi-path fading channel, finish the purpose of finishing cell search fast whereby the influence of cell search deterioration in characteristics.
Secondary objective of the present invention provides a kind of detection and code translator, the cell search that is used for code division multiple access system, more be used in particular for the second stage of the cell search of Wideband-CDMA system, adopt the decoder of phase dry type detector and relevant weighting type free of discontinuities Reed Solomon code can reduce the influence of system's medium frequency deviation effect and multi-path fading channel the cell search deterioration in characteristics.
For reaching above-mentioned main purpose, the invention provides a kind of detection and interpretation method, be applied to the second stage of the cell search of code division multiple access system, this detection and interpretation method mainly comprise the following step: coherently calculate a correlation of this secondary synchronization sign indicating number, wherein this secondary synchronization sign indicating number correlation (correlation values of the secondary synchronization codes) comes from this phase dry type secondary synchronization sign indicating number detector; On each time slot, select maximum correlation value as the detected secondary synchronization sign indicating number of this time slot, and form a code word; And after finishing the code word that receives whole or part, this code word is deciphered in a relevant weighting type free of discontinuities Reed Solomon code, with code group and the frame synchronization that obtains this entering signal.
For reaching above-mentioned secondary objective, the invention provides a kind of detection and code translator, the cell search that is used for code division multiple access system, more be used in particular for the second stage of the cell search of Wideband-CDMA system, this detection comprises with code translator: a dry type secondary synchronization detector mutually, and the code word that is used for a level synchronous code of this entering signal is selected; And a relevant weighting type free of discontinuities Read-Solomon code decoder, be used to carry out code group and the frame synchronization of decoding to obtain this entering signal of this entering signal.
The present invention has following advantage:
(1) secondary synchronization detection method of the present invention adopts phase dry type detection method, can effectively reduce the influence to the cell search deterioration in characteristics of frequency shift (FS) and multi-path fading channel effect, and the more incoherent phase dry type of its effect effect is better.
(2) secondary synchronization detection method of the present invention adopts relevant weighting type free of discontinuities Reed Solomon code decoded mode, can obtain preferable collocation between system effectiveness and complexity.
(3) in practical application, secondary synchronization checkout gear of the present invention can realize that particularly the mode with chip realizes with hardware mode, and this design will be particularly conducive to the exploitation of System on Chip/SoC (SoC).
Description of drawings
Fig. 1 shows that a wide band code division multitask that is used for third generation cooperative programme (3GPP) accesses/frame assumption diagram of frequency division multi-task system.
Fig. 2 shows the flow chart according to a kind of detection according to the present invention and interpretation method.
Fig. 3 a is an embodiment of the square frame 10 of Fig. 2.
Fig. 3 b is an embodiment of the square frame 20 of Fig. 2.
Fig. 3 c is an embodiment of the square frame 30 of Fig. 2.
Fig. 4 shows the structure chart according to a kind of detection according to the present invention and code translator.
Fig. 5 a is an embodiment of this phase dry type secondary synchronization code detectors among Fig. 4.
Fig. 5 b is an embodiment of the weighting type free of discontinuities Read-Solomon code decoder that should be concerned with among Fig. 4.
Label declaration:
111 elementary synchronizing channel 121 secondary synchronization channels
131 Common Pilot Channel
510 phase dry type secondary synchronization detectors, 511 ISN matched filters
512 outer yard matched filter 513 buffer units
514 code word selected cells
520 relevant weighting type free of discontinuities Read-Solomon code detectors
521a, 521b Delay Element 522a, many computing units of 522b
523 unit 524 selected cells that add up
Embodiment
In general, cell search needs to be respectively (1) phase I: slot synchronization (slot synchronization) (2) second stage in regular turn through three synchronous phases: frame synchronization/code group is judged (frame synchronization/code group identification) (3) phase III: disturbing code is judged (scrambling code identification).Now please refer to Fig. 2, this figure shows the flow chart according to a kind of detection according to the present invention and interpretation method, can be used for effectively promoting the usefulness of cell search.This method can be used for the second stage of the cell search of code division multiple access system, i.e. the detection of secondary synchronization sign indicating number is judged to obtain frame synchronization/code group with decoding, but is not limited to this kind application.In step 10, coherently calculate each correlation of this secondary synchronization sign indicating number, wherein this correlation by the ISN (inner code) at the design of all secondary synchronization sign indicating numbers detect with outer sign indicating number (an outer code) detect it.In step 20, on each time slot, select maximum correlation value as the detected secondary synchronization sign indicating number of this time slot, and form a code word.In step 30, finish the code word that receives whole or part after, with a relevant weighting type free of discontinuities Reed Solomon code this code word is deciphered, with code group and the frame synchronization that obtains this entering signal.
Fig. 3 a is an embodiment of the step 10 of Fig. 2.Wherein step 10 also comprises the following step: in step 11,256 chips of this secondary synchronization sign indicating number are divided into W section, every section has 256/W chip, and wherein W is a suitable positive integer, and wherein each away minor segment is referred to as ISN.In step 12, detect its pairing ISN at W section and 16 secondary synchronization sign indicating numbers, promptly ISN detects.For instance, if be divided into 4 sections, every section has 64 chips, and then this ISN detects 4 output valves.In step 13, this W section is carried out outer sign indicating number detect, mate at W section and 16 secondary synchronization sign indicating numbers, there is the output that corresponding ISN detects in the W section that its China and foreign countries' sign indicating number detects.In step 14, the output valve that each outer sign indicating number is detected and its time conjugate complex number of going up the output valve of corresponding one elementary synchronous code detection (in the phase I) multiply each other the value that multiplies each other; Wherein this secondary synchronization sign indicating number and this elementary synchronous code quadrature.In step 15, with this value of multiplying each other in each section get add up behind its real part a correlation, meaning promptly, each secondary synchronization sign indicating number is divided into the W section and adds up.In step 16, be the cycle with the frame with the correlation of step 15, on each time slot respectively at all secondary synchronization sign indicating numbers foundation that the correlation of gained judges as this code word that adds up.
Fig. 3 b is an embodiment of the step 20 of Fig. 2.When the required secondary synchronization sign indicating number of complete reception second stage, follow-up the following step that in step 20, also comprises: in step 21, on each time slot, be chosen in the maximum of this correlation of all secondary synchronization sign indicating numbers of step 16 gained, and store, obtain P correlation (P is the integer between 3 to 15) altogether.In step 22, according to collecting detected secondary synchronization sign indicating number, promptly P correlation obtains one group of complete or code word partly.
Fig. 3 c is an embodiment of the step 30 of Fig. 2.Wherein step 30 also comprises the following step: in step 31, this code word has P symbol, respectively to secondary synchronization sign indicating number that should the symbol representative with and the correlation size (this correlation be receive the secondary synchronization sign indicating number that all desires receive after, stored correlation in step 22), each symbol of this P symbol and this free of discontinuities Reed Solomon code is compared; Wherein compare correct person, the pairing correlation of the symbol of this code word is multiplied by a positive number and forms a weighted value, forms another weighted value otherwise then be multiplied by a negative.The rest may be inferred.Must notice that the design of this positive negative can change to some extent, order certainly by the designer.The phase dry type interpretation method that is disclosed in according to the present invention, its weighted value are the resulting result of step 31.In step 32, this P symbol that adds up may code word be compared the result of the weighted value of back gained as comparison with 960 kinds respectively, finishes up to 960 comparisons.In step 33, select the maximum in 960 comparison results, with code group and frame synchronization as this entering signal.
Fig. 4 shows the structure chart according to a kind of detection according to the present invention and code translator.A kind of detection and code translator, the secondary synchronization sign indicating number that is applied to the cell search of code division multiple access system detects, more be used in particular for the second stage of the cell search of Wideband-CDMA system, detect the secondary synchronization sign indicating number of second stage from an entering signal of base station, this detection comprises with code translator 500: a dry type secondary synchronization code detectors 510 mutually, the code word that is used for a level synchronous code of this entering signal is selected, and a relevant weighting type free of discontinuities Read-Solomon code decoder 520, be used to carry out code group and the frame synchronization of decoding to obtain this entering signal of this entering signal.
Fig. 5 a is an embodiment of this phase dry type secondary synchronization detector 510 among Fig. 4.Wherein this phase dry type secondary synchronization detector 510 more comprises: an ISN matched filter 511; One outer yard matched filter 512; One buffer unit 513 and a code word selected cell 514.As shown in the figure, this ISN matched filter 511, the ISN that is used for this secondary synchronization sign indicating number detects.256 chips of this secondary synchronization sign indicating number are divided into W section, and every section has 256/W chip, and wherein W is a suitable positive integer, and wherein each away minor segment is referred to as ISN.This ISN matched filter 511 mates respectively at W section and 16 secondary synchronization sign indicating numbers respectively.For instance, if be divided into 4 sections, every section has 64 chips, and then this ISN matched filter has 4 output valves.Be somebody's turn to do outer sign indicating number matched filter 512, the outer sign indicating number that is used for this secondary synchronization sign indicating number detects, and wherein is somebody's turn to do an outer sign indicating number matched filter 512 and also mates respectively at W section and 16 secondary synchronization sign indicating numbers.The output valve that has corresponding this ISN matched filter 511 in should the W section of outer sign indicating number matched filter 512, with the output valve of this outer sign indicating number matched filter 512 and its time upward the conjugate complex number of the output valve of corresponding one elementary synchronous code matched filter (in the phase I) multiply each other the value that multiplies each other; Wherein this secondary synchronization sign indicating number and this elementary synchronous code quadrature.Should outer sign indicating number matched filter 512 this value of multiplying each other in each section be got the correlation that the back of adding up behind its real part obtains outer yard matched filter 512 outputs, anticipate promptly, each secondary synchronization sign indicating number is divided into the W section and adds up.Rely on above-mentioned steps, can obtain the output of correlation sign indicating number matched filter 512 outside this of real number.。This buffer unit 513, with the correlation of these outer sign indicating number matched filter 512 outputs is the cycle with the frame, on each time slot, add up and be stored in this buffer unit 513, behind the secondary synchronization sign indicating number of receiving all desires receptions, on each time slot, select the maximum of this correlation of all secondary synchronization sign indicating numbers of gained, and store, obtain P new correlation (P is the integer between 3 to 15) altogether, wherein this P new correlation is real number value.When finish receive the secondary synchronization sign indicating number that all desires receive after, this code word selected cell 514 obtains the code word of a group complete (working as P=15) or part (when 2＜P＜15) in the individual new correlation of P (being an integer).
Fig. 5 b is an embodiment of the weighting type free of discontinuities Read-Solomon code decoder 520 that should be concerned with among Fig. 4.Should more comprise by relevant weighting type free of discontinuities Read-Solomon code detectors 520: a plurality of Delay Element 521a, 521b...; A plurality of computing unit 522a, 522b...; One add up a unit 523 and a selected cell 524.Should operate a code word by relevant weighting type free of discontinuities Read-Solomon code detectors 520, and compare with the 960 kinds of free of discontinuities Reed Solomon codes that may make up, wherein this code word is obtained by this phase dry type secondary synchronization detector 510.
For instance, this code word has P symbol, select by code word selected cell 514, respectively to secondary synchronization sign indicating number that should the symbol representative with and the correlation size, wherein selected secondary synchronization sign indicating number conduct and the foundation of the comparison of 960 kinds of possibility code words, the foundation that this correlation then produces as weights.The P of this a code word symbol enter respectively a plurality of Delay Element 521a, 521b,, among, first symbol enters first Delay Element 521a, second symbol enters second Delay Element 521b, the rest may be inferred.The P of this a code word symbol is also compared with each symbol from this free of discontinuities Reed Solomon code respectively.After comparison, if first symbol is if comparison is correct, then this symbol in this computing unit 522a with one on the occasion of representative; If second symbol comparison mistake, then this symbol is represented with a negative value in this computing unit 522b.The rest may be inferred.Must note, should be on the occasion of ordering certainly by the designer with negative value system.To be stored at last correlation in the Delay Element be multiplied by respectively this correspondence of this computing unit 522a, 522b etc. on the occasion of or negative value, promptly become an input signal of the unit 523 that adds up.This unit 523 that adds up adds up all input signals, and adding up can obtain an accumulated value as comparison result at every turn, and this unit 523 that adds up produced 960 comparison results altogether before decoding was finished, and inputed to selected cell 524 in regular turn.
After these 960 times comparisons, this selected cell 524 is connected in this unit 523 that adds up, and selects the greatest measure in 960 comparison results, and the free of discontinuities Reed Solomon code that this numerical value corresponded to is code group and the corresponding frame synchronization that we judge.This peaked system of selection is as follows, for the first time in the comparison, with the size relatively of predefined numerical value (this numerical value is determined by the designer) in the output of the first stroke of the unit 524 that adds up and the selected cell 524, the code word that numerical value that will be bigger is corresponding with it is stored in this selected cell 524, after this, the input signal that newly advances each time all compares with the signal that is stored in this selected cell 524, and the higher value after storing relatively.The rest may be inferred, can rely on the data that are stored in the selected cell 524 to judge code group and frame synchronization when 960 comparisons finish.
In practical application, detection of the present invention and code translator, because therefore the definite functions of each square can cooperate hardware mode to realize with software, particularly the mode with chip realizes, to be embedded on the cell search circuit.
Therefore, be used for the detection and the interpretation method of code division multiple access system according to the present invention, can be in code division multiple access system, reduce the effect that frequency shift (FS) and multi-path fading channel caused effectively and reach cell search fast.
The detection and the code translator that are used for code division multiple access system according to the present invention, can be under frequency shift (FS) and multi-path fading channel effect effective elevator system usefulness.The method according to this invention and device can be used for mobile device and radio individual digitlization assistant (PDA) system.
Though the present invention discloses with aforementioned preferred embodiment; right its is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention defines and is as the criterion when looking claims.
Claims (8)
1. one kind is detected and interpretation method, is applied to the second stage of the cell search of code division multiple access system, and this second stage detects the secondary synchronization sign indicating number from an entering signal of base station, and it is characterized in that: this detection and interpretation method comprise the following step:
(a) coherently calculate the correlation of this secondary synchronization sign indicating number, wherein this correlation by the ISN at all secondary synchronization sign indicating numbers designs detect with outer sign indicating number detect it;
(b) on each time slot, select maximum correlation value as the detected secondary synchronization sign indicating number of this time slot, and form a code word;
(c) finish the code word that receives this whole or part by a phase dry type secondary synchronization detector after, with a relevant weighting type free of discontinuities Reed Solomon code this code word is deciphered, with code group and the frame synchronization that obtains this entering signal.
2. detection as claimed in claim 1 and interpretation method is characterized in that: wherein step (a) also comprises the following step:
(a-1) 256 chips with this secondary synchronization sign indicating number are divided into W section, and every section has 256/W chip, and wherein W is a suitable positive integer, and wherein each away minor segment is referred to as ISN;
(a-2) detect its pairing ISN at 16 secondary synchronization sign indicating numbers respectively;
(a-3) this W section is carried out outer sign indicating number and detect, mate with 16 secondary synchronization sign indicating numbers, have the output of corresponding ISN detection in W section of its China and foreign countries' sign indicating number detection at the outer sign indicating number testing result of W section;
(a-4) output valve that each outer sign indicating number is detected and its time conjugate complex number of going up the output valve of corresponding one elementary synchronous code detection in the phase I multiply each other the value that multiplies each other; Wherein this secondary synchronization sign indicating number and this elementary synchronous code quadrature;
(a-5) this value of multiplying each other in each section is got add up behind its real part a correlation, meaning promptly, each secondary synchronization sign indicating number is divided into W section and adds up;
(a-6) this correlation with step (a-5) is the cycle with the frame, adds up the foundation that the correlation of gained is judged as this code word slot synchronization on each time slot respectively at all secondary synchronization sign indicating numbers.
3. detection as claimed in claim 2 and interpretation method is characterized in that: wherein step (b) also comprises the following step:
(b-1) be chosen in the maximum of this correlation of all secondary synchronization sign indicating numbers of gained of step (a-6) on each time slot, and store, obtain P new correlation altogether, wherein P is the integer between 3 to 15;
(b-2) collect detected secondary synchronization sign indicating number thus, promptly P correlation obtains one group of complete or code word partly.
4. detection as claimed in claim 1 and interpretation method is characterized in that: wherein step (c) also comprises the following step:
(c-1) this code word has P symbol, each symbol of this P symbol and this free of discontinuities Reed Solomon code is compared, wherein compare correct person, the pairing correlation of the symbol of this code word is multiplied by a positive number and forms a weighted value, forms another weighted value otherwise then be multiplied by a negative;
(c-2) add up this P symbol respectively with 960 kinds may code words the weighted value of comparison back gained as the result of comparison, finish up to 960 comparisons;
(c-3) select maximum in 960 comparison results, with Rule of judgment as the code group and the frame synchronization of this entering signal.
5. one kind is detected and code translator, is applied to the second stage of the cell search of code division multiple access system, and described second stage detects the secondary synchronization sign indicating number from an entering signal of base station, and it is characterized in that: this detection and code translator comprise:
One phase dry type secondary synchronization detector carries out outer sign indicating number and detects being divided into W section in this secondary synchronization sign indicating number, mates at outer yard testing result and 16 secondary synchronization sign indicating numbers of W section, is used to select the code word of this entering signal;
One relevant weighting type free of discontinuities Read-Solomon code decoder, connect this phase dry type secondary synchronization detector after, be used to carry out the decoding of this entering signal, with code group and the frame synchronization that obtains this entering signal.
6. detection as claimed in claim 5 and code translator, it is characterized in that: 256 chips of this secondary synchronization sign indicating number are divided into W section, every section has 256/W chip, wherein W is a suitable integer, each away minor segment is referred to as ISN, detects pairing ISN at 16 secondary synchronization sign indicating numbers, is referred to as ISN and detects, this W section is carried out outer sign indicating number detect, mate at outer yard testing result and 16 secondary synchronization sign indicating numbers of W section.
7. detection as claimed in claim 6 and code translator is characterized in that: wherein this phase dry type secondary synchronization detector also comprises:
One ISN matched filter, the ISN that is used for this secondary synchronization sign indicating number detects;
One outer yard matched filter, the outer sign indicating number that is used for this secondary synchronization sign indicating number detects, and obtaining multiply each other a value and a correlation, this value of multiplying each other multiplies each other from the conjugate complex number of the output valve of corresponding one elementary synchronous code matched filter in the phase I on the output valve of this outer sign indicating number matched filter and its time and obtains; This correlation outside this in sign indicating number matched filter, is got this value of multiplying each other in each section to add up behind its real part and is obtained, and that is to say that each secondary synchronization sign indicating number is divided into W section and adds up; Wherein this secondary synchronization sign indicating number and this elementary synchronous code quadrature;
One buffer unit, the correlation of sign indicating number matched filter output is the cycle with the frame outside being used for being somebody's turn to do, on each time slot, add up and store, behind the secondary synchronization sign indicating number of receiving all desires receptions, on each time slot, select the maximum of this correlation of all secondary synchronization sign indicating numbers, and store and obtain the new correlation of P altogether, P is the integer between 3 to 15;
One code word selected cell is used for when P=15 obtaining one group of complete code word at P new correlation, o'clock obtains the part code word in P new correlation in 2＜P＜15.
8. detection as claimed in claim 5 and code translator is characterized in that: wherein should also comprise by relevant weighting type free of discontinuities Read-Solomon code decoder:
A plurality of Delay Elements are used for P symbol of this code word and each symbol of this free of discontinuities Reed Solomon code are compared;
A plurality of computing units are connected in this a plurality of Delay Elements, be used for producing on the occasion of with negative value, wherein the symbol of this code word is if comparison is correct, then produce one on the occasion of, otherwise then be a negative value;
One unit that adds up, be connected in a plurality of computing units, be used to the input signal that adds up, adding up can obtain an accumulated value as comparison result at every turn, wherein this input signal by be stored in correlation in the Delay Element be multiplied by respectively this correspondence of this computing unit on the occasion of or negative value;
One selected cell is connected in this unit that adds up, and selects the maximum in the comparison result, and the pairing free of discontinuities Reed Solomon code of this maximum is as the code group of judging this entering signal and the basis for estimation of pairing frame synchronization.
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| CN1303179A (en) * | 1999-12-15 | 2001-07-11 | 三星电子株式会社 | Equipment for catching asychronous wideband DS/CDMA signal |
| CN1307415A (en) * | 2000-01-11 | 2001-08-08 | 三星电子株式会社 | Device for searching mesh and method for obtaining per-mesh uniquely code |
| WO2002037725A1 (en) * | 2000-10-30 | 2002-05-10 | Mitsubishi Denki Kabushiki Kaisha | Cell search controller and cell search control method |
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|---|---|
| CN1459945A (en) | 2003-12-03 |
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