TW522658B - Coherent detecting and decoding method and apparatus - Google Patents

Abstract

The invention discloses a detecting and decoding method, used for two stage of cell search method for the CDMA system, detecting a secondary synchronization code of an incoming signal from the basestation, the detecting and decoding method comprising the steps of: coherently calculating the correlation values of the secondary synchronization code, wherein the correlation values are obtained from inner codes detection and outer codes detection in accordance with the secondary synchronization code; selecting the maximum correlation values in each slot as the secondary synchronization code detected from the slot, and forming a code word; decoding the code word by a coherently weighted comma-free Reed Solomon code to achieve the code group and frame synchronization of the incoming signal, after completing to receive the whole or partial part of code word. The invention also discloses a detecting and decoding apparatus to realize the detecting and decoding method according to the present invention.

Description

522658 V. Description of the invention α) [Field of the invention] The present invention relates to a detection and decoding method and device, which are used in the decoding process of the communication system. More specifically, it relates to a detection and decoding method and device for cell search of a 3rd Generation Partnership Project (3GPP) wideband code division multiple access (W-CDMA) system ( cell search). The method and device use homology detection and homology weighted non-stop Reed-Solomon code (comma-free Reed Solomon code, CFRS) decoding can effectively improve performance. [Previous technology] A direct sequence spread spectrum code division multiple access technology (ce H u 1 arsystems) is used to greatly / add channels capacity. This system has attracted considerable attention in recent research on mobile communication systems. Generally speaking, because of frequency reuse, the bandwidth efficiency of the multiplexed access system is more than that of other multiplexed access systems (such as frequency division multiplexed access and time division). Access) is even more superior. In addition, cell planning (ceH planni ng) is quite simple in the code division multiplexing access system. Therefore, the code division multiple access cell system will be the mainstream in the future. In particular, the 3rd Generation Partnership pr0ject (3GPP) wideband division code multiplexed access / division duplex (W-CDMA / FDD) system has been adopted in a third-party IMT-20 00 Generation system standards. In a one-code multiplexed cellular system, the user device (us er

00477.ptd Page 6 522658 V. Description of the Invention (2) Equipment (UE) As a method of searching for the best cell, it is called "cell search" (ce 1 1 search). A fast cell search system is very important. Reduce the user device's switched-on delay (initial search), increase standby time (idle mode search) and handover (act state search, act i ve mode search) to maintain good communication link quality. Please refer to Figure 1, which will help to understand the codes of a 3rd Generation Cooperative Computing (3GPP) wideband frequency division multiplexing access / frequency division multiplexing system Frame structure. First, in the 3rd Generation Partnership Project (3GPP) broadband frequency division multiplexing access / frequency division multiplexing system, cell search is generally performed through three stages (threestages). Completed, the three phases consist of two specially designed synchronization channels (SCH) and a common pilot channel (CPICH). In the first phase 110, the primary synchronization channel (Primary synchronization channel (PSCH) 1 11 is used for slot synchronization. The primary synchronization channel 111 contains a primary synchronization code (PSC) defined as acp, where "an (二 土 1)) depends on The presence or absence of diversity transmission at the base station is determined. In the second phase 120, a secondary synchronization channel (SSCH) 121 is used for frame / code gr0Up identification. The secondary synchronization channel 121 contains secondary synchronization codes (SSCs) defined as acs, where the coefficient a is

00477.ptd Page 7 522658 V. Explanation of the invention (3) Equivalent to Sun Xu of the primary synchronization channel »^ u, ^ < coefficient. In the third stage 130, the common guiding channel 1 31 is used for the decision of downloading the _minr Η · I compound code (downlink scrambling code). As shown in the figure, 15 time slots are included in a 10 millisecond (ms) code frame, and because the system uses a speed of 3.84 million chips per second (MchiPs / sec). Therefore, each code frame contains 38400 chips, that is, each time slot contains 2560 chips. In addition, the distance between the far primary synchronization channel and the secondary synchronization channel includes 256 chips and is transmitted only at the beginning of the time slot boundary. In recent years, a fast cell search method of a cellular system for code division multiplexing has been disclosed. See U.S. Patent No. 6, 1 825, 2 44 issued to Nystrom and others, whose title is "Cell searching in a CDMA communications system". See U.S. Patent No. 6, 28.9, 2007, issued to Kim et al., Entitled `` A Method for Obtaining Cellular Base Stations in a System of Unsynchronized Coded Multiplexing Access Operations '' (μ eth 〇df 〇r Acquiring A Cell Site Station in Asynchronous CDMA Cellular Communication Systems). See also US Patent No. 6,038,250 issued to Shou et al., entitled "Initialization Synchronization Method and Direct Serial Type `` Code Division Multiplexed Access Receiver for Asynchronous Cell System Receiver '' (Initial Synchronization Method And Receiver for DS-CDMA Inter Base Station

Asynchronous Cellular System). However, since the frequency offset is the frequency of the crystal oscillator of the user device is unstable, for the user device, the carrier frequency of the incoming signal may be

00477.ptd Page 8 522658 V. Description of the Invention (4) There will be a frequency offset ’which will cause a frequency offset. In the past, the secondary synchronization detection device used in the second stage of cell search can be roughly divided into two stages: (1) a secondary synchronization code matched filter for detecting the secondary synchronization code And (2) the decoder performs a decoding process according to the secondary synchronization code matching filter and the wave is the detected codeword. Among them, the secondary synchronization code matches the wave filter and uses a non-homogeneous structure (η ο η-c 〇herentstructure) to combat the frequency offset and performance degradation caused by the multipath fading channel (jjj u 11 ipath fading channel). . This technology can be found in γ. P. E. Wang and T. Ottosson, " Initial frequency acquisition in W-CDMA, n IEEE Proc · VTC, 99, Vol. 2, PP · 1013-1017, Sep · 1 99 9 . In addition, the decoder part can be roughly divided into Soft Decision type and Hard Decision type. However, the soft-decision (sof1: Decision) decoder requires a large number of operations, which increases the complexity of the device. Therefore, Hamming corre 1 a tor is usually used. The design of the Hammer correlator makes the complexity relatively low, but its efficiency is also poor. [Summary of the invention] The main purpose of the present invention is to provide a detection and decoding method for cell search of a code division multiplexing access system, and more particularly a second stage of cell search for a wideband code division multiplexing access system. Using the homology detection method and the homology weighted non-stop Reed-Solomon code decoding method can reduce the frequency offset effect in the system and the multi-path fading channel for cell search characteristics

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Deteriorated shirt ring, thereby completing the purpose of quickly completing the cell search. The secondary purpose of the invention is to provide a detection and decoding device for cell search in a multiplexed access system, and more specifically for the second stage of cell search in a wideband multiplexed multiplexed system, using homology detection Decoder and the same m-type non-stop Reed, Solomon code decoder can reduce the frequency offset effect in the system and the degradation of the cell search characteristics of the multipath fading channel to achieve the above-mentioned main purpose. The present invention provides a detection and decoding method for application In the second stage of the cell search of the code division multiplexing access system, the = and the decoding side M must include the following step: Calculate the correlation value of the secondary same V code in a coherent manner, where the correlation value of the secondary synchronization code (CQrreiati〇n two lues 〇f the secondary synchr〇nizati〇nc〇des) from M homophonic secondary synchronization code predicator; the largest correlation value is selected on a time slot as the secondary detected in this time slot Synchronize the code and form a dove character; and after completing the reception of all or part of the code word, the coherent weighted non-stop Reed-Solomon code decodes the code word to obtain the code group of the number and Frame synchronization. ° In order to achieve the above-mentioned secondary purpose, the present invention provides a detection and decoding device for cell search of a code division multiplexing access system, and more particularly a second cell search using a frequency division code multiplexing access system. The toilet code device includes:-co-modulation secondary co-op ...: detection and solution of the M-step detection fast for the entry-codeword selection of the secondary synchronization code; and co-adjustment of the weighted core of the entry signal Code group and code frame synchronization. T j V. Description of the invention (6) (1) The present invention has the following advantages: () The method of the present invention can effectively reduce the step ^ synchronous detection method, and adopts the homology detection method to find the degraded characteristics ^ ^ offset and multiple paths The effect of the fading channel on the cell search time = month =% 'The effect is better than the non-homogeneous effect. The Reed-Solomon code group-level synchronization detection method uses a homology-weighted type without interruption for a better match. The decoding method can be taken between system efficiency and complexity. (3) In practical applications, the method can be implemented. The secondary synchronization detection device of ^ θ Ming can be implemented in a hardware-specific / systematic manner. This—the design will Special Κ :: Κ = ί will be made clearer from the detailed description below, and the scope of the 曱 May patent attached to r 疋. [Detailed description of the invention] Generally speaking, 'cell search needs to go through three synchronization stages in sequence, respectively, (the first stage: slot synchronization (slot synchrónizati) the second stage: frame synchronization / code group determination ( frame

S 5ynChr〇nization / code gr〇up identificati〇n) (3) The third C # .j ^ (scrambling code identification) 〇 Please refer to FIG. 2, which shows a method for decoding a detection disc according to the present invention. Flow chart '彳 is used to effectively improve the efficiency of cell search. This method can be used in the second stage of cell search of the code division multiplexing access system, that is, the detection and decoding of secondary synchronization codes to obtain code frame synchronization / code group determination, but it is not limited to this application. In step 10, the correlation values of the secondary synchronization code are calculated in the same manner ... The correlation value is designed for all secondary synchronization stone horses.

522658 Fifth, the description of the invention (7) inner code detection and outer stone i ^ In step 20, in each time slot, select | (: ^ :: code) to detect it. The detected secondary synchronization code is shaped, and the: ^ correlation value is used as the time slot after receiving all or part of the codeword f. In step 30, the end-Solomon code decodes the codeword, weighted non-stop Reed and frame synchronization. The code group that waits for the incoming signal. Figure 3 (a) is one of the steps in Figure 2. It includes the following steps: In step U, it will :: 2. Second step step change Integer basin? w has 256 _ chips ′ which is a suitable force, counting a small section of which is called the inner code. In Niu Fai 19 *, it is necessary to detect the corresponding internal code of 16 secondary synchronization codes: code ': For the column, if it is divided into 4 sections, each section has 6 horses. Test, Λ: In step 13, the lines in the w section ... are matched, and the output of the secret code detection of the outer code detection is output. In step ", multiply the silk complex number of the secondary isochronous value in each by-to multiply the value; its-region π is orthogonal to the synchronization code of the helium level. In step 15, each level = The multiplying value takes a correlation value after the real part accumulation, that is, the phase; 2 = the axis segment accumulation. In step 16, the step ㈣ synchronization period 'is in each time slot for all secondary \ The correlation value is used as the basis for the judgment of the codeword. The second line is the embodiment of step 20 in Figure 2. When the second secondary synchronization code is completely received, the following step 20 includes the following step 522658 V. Description of the invention (8 ) Step: In step 21, select all obtained in step 丨 6 on each time slot

The maximum value of the correlation value of the secondary synchronization code is stored and a total of P correlation values are obtained (p is an integer between 3 and 15). In step 22, a set of complete or partial codewords is obtained according to the detected secondary synchronization codes, that is, P correlation values. Brother 3 (c) The picture system includes the following steps, corresponding to the relative value of the symbol, after receiving the stored correlation value, a corresponding negative number corresponding to each symbol is formed into another design, and can be decoded with homology. In step 32, In step 33 of the obtained weighted value, the figure 4 of the code group of the selected signal is shown. An example of a secondary cell retrieval system for cell detection " Lüjiu ', the test, is an embodiment of step 30 of Figure 2. Wherein step 3 〇 more: in step 31, the codeword has ρ symbols, respectively representing the secondary synchronization code and its size (after all secondary synchronization codes to be received in this phase, in step 2 2 Center), the P symbols are compared with the uninterrupted Reed-Solomon code; where the comparison is correct, the symbol value of the code word is multiplied by a positive number to form a weighted value, otherwise it is multiplied by Weighted. So on and so forth. It should be noted that the change of the positive and negative numbers is customized by the designer. According to the method described in the present invention, the weighting value is the result obtained in step 3 丨> After accumulating the P symbols and comparing them with 960 possible characters, the results are compared until For 9600 comparisons, 9600 comparison results are selected and the results are synchronized with the code frame. The larger value is used as the structure of the detection and decoding device π "," ", and is applied to the fine synchronization code detection of the code division multiplexing access system. Ρσ 丨 τ ^ # 晟 夕 Μ is more particularly Used for the second phase of the broadband multi-band multiplexer, check)… device 50 0 contains:-homophonic secondary synchronization code

V. Description of the invention (9) Detector 510, used for the access selection, and a code weight selection of 1-tone weighted discontinuity \ first-order synchronization code, for performing the decoding of the incoming signal. De-Solomon Code Decoder 52 0, frame synchronization. The code group and codes transmitted to the incoming signal. Fig. 5 (a) shows the embodiment in Fig. 4. Among them, the isomorphic secondary D. One of the secondary synchronization detectors 5 1 0 513 and a code word selection unit 514 is provided with a filtering benefit 512; a temporary storage unit 511 is used for the secondary. As shown in the figure *, the 25 6 chips of the inner code matching filter code are divided into w sections, and the inner code is detected. The secondary synchronization is performed in which W is a proper positive integer, and the mother_segment has 256 / W chips. The inner code matching filter 5 is called an inner code. match. For example, if it is divided into 4 bars;! 16, the secondary synchronization code is 512 respectively for the secondary synchronization code value. The outer code matches the wave filter, and the waver 512 is also targeted for 16 times, where the outer code matches the wave filter, and the gate phase is stored in the "quote" section for matching. Correspondence of material code matching-primary synchronization code multiplication: 1 ::: = The smoke outer code matching filter in its skin 5 1 2 After multiplying the value of J in each section and accumulating it, A correlation value 'IgeP' output from an outer code matched filter 5 1 2 is obtained, and each secondary synchronization code is divided into w sections and accumulated. Through the above steps, the correlation value of real numbers can be obtained in the outer code matched filter.

00477.ptd ΪΗ page 14 5. Invention Description (10) 512. . The temporary storage unit 513 'matches the output phase of the outer code matching filter 512. . The threshold takes the code frame as a cycle and is accumulated at each time slot. . Store in the temporary storage unit 5 1 3 until you pick up the maximum value of ",,,, ', and" from two: two: the phase with a secondary synchronization code is an integer between 3 and 15) ^ ^; τ new correlation values are real values. Report ~, After receiving all secondary synchronization codes to be received, the codeword selection list yt 514 'new P or a new correlation value or part (when 2 < P < 15) codewords, ,,,,,,,,, and (5) (5) (b) Figure 5 is an example of the same outline in Figure 4. ★ Code decoder 520. Xi; Mouth 51 No The discontinuous Reed-Solomon gate code detection benefit 5 20 also includes a plurality of delay elements 52U "Solo 52lb, ...; a plurality of calculation units". A '523 and -selection unit 524. The homology, two = plus The f-ary gate code detector 5 20 operates a code word, fish 1 ", and the discontinuous Reed-Solo and De-Solomon codes are compared, in which there are a number of possible combinations of uninterrupted detectors 5 1 0 obtain. ,,, And children are synchronized by this isomorphic secondary

For example, the codeword has p symbols, which correspond to the sub-horse represented by the symbol & choose early element 514, choose the small one, among which the selected secondary synchronization code is, the J code, and its correlation value are large. Basis, and the correlation value is used as the weight; 960 kinds of possible comparisons of the characters are entered into the complex ==: 5 productions 2] the basis of the birth ... the character P enters the first delay element 5 a: 521b,, and, the first delay element 521b, and so on. The second and second symbols enter the P symbols of the second ° Hima character and are respectively 522658. 5. Description of the invention (π) ^ 『 ：： German: each symbol of the ^ door brown is compared-after η. If the right symbol is compared correctly, then two =: two positive values r if the second symbol is incorrectly compared, Then the pay το is represented by a negative copy in this very early element 522b., 咅 外 t 乂 士 & So on and so forth. Note that w, the positive and negative values of the edge are multiplied by the relevant values in the designer's own parts. After the calculation has been completed, the delay is equal to the existence of a positive or negative value, which becomes the cumulative value. 'Every time you accumulate, you can get 960 comparison results. In order, the accumulative unit 523 will go through this 9960 comparisons. Qfirwm chooses early 524, connected to the accumulation unit, and selects 960 comparison results η · a to I 卩 1 break Φ π β 1 the largest value, which corresponds to = ί: ϊSolomon code is our judgment And the corresponding code frame are synchronized. The choice of the maximum value-\ 了 中, Chiang, the interpretation method is as follows, the brother once compared, set the value (this value is determined by the designer ^ and Guangxuan Zao 疋 pre-set in 524 to match $ Mana ^ Shi t, 弋) compare the size, and store the larger value of the eight corresponding code to the input signal of the selected Shijin. All the input signals are stored in Mingwu 5 24. After that, the mother once new ^, # η ^ ^ Γ is stored in The signal in the unit 524 is compared when comparing Shi Zhiyan-the value of moxibustion. By analogy, until 960 times, Yu, Yu, and Shu Shu Shou can hunt the data group stored in the selection unit 524 to send the group to synchronize with the code frame. In the application, the function of h in the present invention is clear. This means that the remaining and decoding devices are implemented on the cell search circuit due to the " of each block. a

522 () 35

Due to the multiple code division method, multiple paths can be used in accordance with the on-frequency performance. Although wireless and wireless are fixed within the scope of this issue, according to the present invention, the rate can be shifted in the split path. The number of individuals in the present invention is clear, and when the present invention is appended, it can be used in the code multiplexing channel. The code division and multi-level based assistants have been familiar with the above-mentioned various patent application systems based on the foregoing, and the successful effect and method of fast multiplexing access system path fading channel clear and pda system. The preferred embodiment reveals that the artist does not change or modify the range defined by the system's detection and decoding to effectively reduce the frequency offset and reach the cell search quickly. The detection and decoding device can effectively enhance the system under the effect. However, it is not intended to limit the scope of the present invention and the scope of protection of the present invention.

00477.ptd Page 17 522658 Simple description of the diagram [Simplified description of the diagram] Figure 1 shows a code box for a 3rd Generation Cooperative Computing (3GPP) broadband frequency division multiplexing access / frequency division multiplexing system. Structure diagram. Fig. 2 is a flowchart showing a detection and decoding method according to the present invention. Figure 3 (a) is an embodiment of block 10 of Figure 2. Figure 3 (b) is an embodiment of block 20 of Figure 2. Figure 3 (c) is an embodiment of the second block 30. Fig. 4 is a block diagram showing a detection and decoding device according to the present invention. Fig. 5 (a) is an embodiment of the coherent secondary synchronization code detector in Fig. 4. Fig. 5 (b) is an embodiment of the coherent weighted non-stop Reed-Solomon code decoder in Fig. 4. [] [Simplified description of the chart] 111 primary synchronization channel 121 secondary synchronization channel 131 common guidance channel 5 1 0 homophonic secondary synchronization detector 5 11 internal code matching filter 5 1 2 external code matching filter 5 1 3 temporary storage Unit 5 1 4 codeword selection unit 520 Coherent weighted non-stop Reed-Solomon code detector 521a, 521b Delay elements 522a, 522b Multiple calculation units 523 Accumulation unit 524 Selection unit

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Claims (1)

^ 22658 6. Scope of patent application1. A kind of detection and decoding method, applied to the second stage of the search, to check the cell step code from the ^ land ^ two-work access system, which is used to detect the ancient soil. The secondary code method for the secondary signal of the access signal includes the following steps: (a) Calculate the secondary synchronization value coherently for all secondary synchronization codes ^, where the correlation value is (b ) In each time slot: ° and σ inner code detection and outer code detection; the secondary synchronization code, and form an I, phase · off value as the time slot detected (c) complete the reception The whole or part of the 1 sub-segment and the broken Reed-Solomon code synchronize the code word into the sub-^^ to synchronize the weighted invariant code group and frame.仃 Decode to obtain the incoming signal 2. According to the first item of the scope of the patent application, the following steps are included: a double / "decoding method, wherein step (a) (a-1) has the secondary synchronization code 256 having 25 6 / W chips, where the fixed chip is divided into W sections, each section is called an inner code; 'appropriate positive integers, where each small (a-2) is directed to 〖6 secondary Synchronization (a-3) Check the W code for the outer code ", and test its corresponding inner code; match, where the w code for the outer code detection is output for 16 secondary synchronization codes; There is a corresponding inner code detection (a-4) for each outer code detection of the input-level synchronization code detection (in the first stage, a value corresponding to a primary corresponding to its time is multiplied; where the secondary is the same , The conjugate complex number of the output value is multiplied, the primary synchronization code is orthogonal; 00477.ptd 19th 522658 Sixth, the scope of patent application (a-5) takes the multiplied value in each section as a basing value, that is, each secondary synchronization _ ^ P f accumulates a correlation and accumulates for all secondary synchronization codes separately. ：: 2: The basis for the judgment of the slot word in the mother. 'The relevant value served is the third hit of the code: I The method of detection and decoding of item 1 of the patent scope, No. 1 in Niu Sui also includes the following steps: Step (b) # ", ί # ^ # ^ ^ ^ ^ ^ ^ i Γ two levels of human values two maximums' and stored them, a total of p correlation values eight are integers between 3 and 15; and 2) and detected by the Secondary synch, that is? Correlation values, multiple j, and integer or partial codewords. • Wide .... /: 夂-The detection and decoding method of the first item in the range, the steps of which further include the following steps: (: two :: two have p symbols, the p symbols and the uninterrupted De-: ,, 隹 :: Mother of horses compares a symbol, where the comparison is correct, the corresponding value of the code = several is multiplied by a positive number to form a weighted value, otherwise it is multiplied by a negative number Form another weighting value; f adds the p symbols and 96. The extreme value obtained after the comparison of the possible codewords is used as the result of the comparison, until the end of the 96th comparison. And 96 is selected. The maximum value in the result is synchronized with the code frame as the code group of the signal. 00477.ptd Noodle Page 20 6. The patent application scope 5 and ::: 2! The detection and decoding method of item 4 of the scope of benefit, where the positive number and number system can be equal or unequal. 6 · Detecting the blood full of dreams ^ Searching for smears — 'Applies to the cell code of the multi-code multiplexed access system, 仏 ^ ^' and 'detects the secondary homo-homology of the incoming signal from one of the base stations :! The testing and decoding device includes: a selection; and a human, and a synchronization detector, which is used to select a codeword of the incoming signal, and the right is a non-stop Reed ~ Solomon code decoder for decoding the ^ To obtain the code group and code frame synchronization of the incoming signal. The detection and decoding device of the sixth item of interest range, wherein the coherent ^ human-level synchronization detector further includes: # a stepping out of the matching filter is used to detect the inner code of the secondary synchronization code; to a phase, matching Filter 'is used for the detection of the outer code of the secondary synchronization code, and the multiplication value of j and a correlation value are obtained;: deposit certificate 70, which is used to encode the correlation value output by the outer code matching filter in code, period, It is accumulated and stored in each time slot. After receiving all the secondary synchronization codes to be received, the maximum value of the correlation value of all the secondary synchronization codes is selected in each time slot and stored to obtain a total of P correlation values. (P is an integer between 3 and 15); and a codeword selection unit for obtaining a complete (when P = 15) or part (when 2 < p < 15) the code word. 00477.ptd $ 21 pages 522658 VI. Application for patent scope 8 · Detection force according to item 6 of the scope of patent application: Right-type non-stop Reed-Solomon code decoder is more H, and the coherent complex delay elements are used for glands The two symbols of the Xichen A to-Solo π code are compared with each of the symbols of the non-discontinuous dimensional Solomon code; a plurality of calculation units connected to the plurality of: and a negative value, where the code If the symbol's symbols are compared; a positive value, otherwise a negative value; the housing unit is a positive and one accumulation unit, connected to a plurality of calculation units, and the number 'each accumulation can get an accumulation value as a ratio = The input signal is stored in the delay element =, where the corresponding positive or negative value of the input unit, etc .; multiply the value by the value in the calculation-selection list it, and connect to the accumulation unit , Select the value to be the largest of the 5 π results of the code group synchronized with the code frame of the incoming signal. According to the detection and solution of the 7th item in the scope of the patent application ① West: 7, Fen, and Shimeng receive support ". ^ i 5 is divided into w positive integers, ... Synchronous code of 25 6 codes in which the internal code ί ί has 256 / W〃 chips, where w is an appropriate section, each section is called the internal code each small 10. According to the scope of patent application No. 7 The detection and decoding of the item is matched to the 6 types of 2_ when detecting the inner code, among which the internal and 'synchronous maps are matched 11. The detection and decoding device according to item 7 of the scope of patent application, where I and the outside 00477.ptd Page 22 522658 VI. When applying for patent range matching filter and outer code detection, it matches 16 secondary synchronization codes respectively. 1 2. The detection and decoding device according to item 7 of the scope of patent application, of which The multiplied value output by the outer code matched filter is a common complex number of the output value of the outer code matched filter and its time corresponding to one of the primary synchronization code matched filters (in the first stage). Multiplying; wherein the secondary synchronization code is orthogonal to the primary synchronization code. 1 3. The detection and decoding device according to item 7 of the scope of patent application, wherein the correlation value output by the outer code matching filter is in the In the outer code matching filter, The multiplied value in each sector is accumulated after taking the real part, that is, each secondary synchronization code is divided into W sectors and accumulated. 1, 4. According to the detection and decoding device of the eighth patent application scope, The positive and negative values may be equal or unequal. 00477.ptd Page 23