WO2001099321A1

WO2001099321A1 - Pattern identifying method, pattern identifying device, searcher device, and communication terminal

Info

Publication number: WO2001099321A1
Application number: PCT/JP2001/005197
Authority: WO
Inventors: Masayuki Sano; Shintaro Hirose; Tadahisa Kouyama
Original assignee: Sanyo Electric Co., Ltd.
Priority date: 2000-06-23
Filing date: 2001-06-19
Publication date: 2001-12-27
Also published as: AU2001274546A1

Abstract

A pattern identifying method for computing the correlation value between a signal containing any of nkinds of function patterns and the function pattern so as to identify the function pattern contained in the signal, comprising dividing the signal into portion of a predetermined length and correspondingly the function pattern into pieces of a predetermined length, and computing the correlation values sequentially between the signal and the functions patterns of the nkinds, thereby to identify the function pattern on the basis of the computation result. As a result, a speading code can be identified simply by a means of a small size with a high reliability while being hardly influenced by, e.g., fading.

Description

Description Pattern discrimination method, pattern discrimination device, searcher device, and communication terminal

The present invention provides a pattern determination method, a pattern determination device, and a method for calculating a correlation value between a signal including any one of n types of function patterns and a function pattern to identify the function pattern included in the signal. The present invention relates to a searcher device using the same, and a communication terminal. Background art

A searcher device that synchronizes with a base station when initial synchronization is established and that identifies a spreading code (detects a code number) from a code group including a plurality of detected spreading codes is known. This searcher device obtains a correlation value between a received signal containing one of a plurality of (e.g., eight) spread codes and the generated plurality (eight) of spread codes. The spread code included in the received signal is identified based on the correlation value.

FIG. 11 is a block diagram showing an example of a spread code (pattern) discriminator used in a conventional searcher device. The discriminator includes a correlator block 101, and a code number discriminator 102 for judging a code number from a correlation result of the correlator block 101. A spread code generator 103 for generating a code, a correlator 104 for correlating the spread code generated by the spread code generator 103 with a received signal, and an output of the correlator 104 And an averaging processing unit 105 for averaging the values.

FIG. 12 is a diagram illustrating the operation of the above-described determination unit. The spreading code generator 103 generates, for example, one type of spreading code for each frame with respect to a CPICH (Common Pilot Channel) sent from a base station (not shown), performs correlation calculation, and averages them. After repeating this operation sequentially for the eight types of spreading codes, the code number determining section 102 includes, in the received signal, the spreading code for which the largest correlation value was obtained. The code number is determined as the spread code to be used.

FIG. 13 is a block diagram showing another conventional technique, in which, for example, eight correlator blocks 101 shown in FIG. 11 are provided in parallel, and different correlators blocks are simultaneously generated in each correlator block. Correlation operation is performed on eight types of spreading codes and one received signal, for example, one frame, and the code number determination unit 102A outputs the spreading code generated by the correlator block that outputs the largest value. The code determines the code number as the spreading code included in the received signal.

However, in the prior art shown in FIGS. 11 and 12, the spreading codes are generated one by one with respect to the received signal, and the correlation calculation process is completed for each spreading code. For example, as shown in Fig. 14, the received signal level became smaller due to faging and the like during the correlation calculation processing for a certain spreading code (for example, C3, C7). In such a case, if the correlation value of the spreading code becomes small, the spreading code having the truly maximum correlation value cannot be determined, and a highly reliable spreading code cannot be determined.

On the other hand, in the prior art shown in FIG. 13, since all the generated spreading codes are used at once for the correlation operation, they are not easily affected by fading as described above. Although the discrimination process can be performed quickly, it is necessary to provide a number of correlator blocks corresponding to the type of the spreading code, which complicates the configuration and prevents simplicity and small size. Therefore, if the number of spreading code patterns to be determined increases, it cannot be handled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a simple and compact pattern discriminating method capable of discriminating a spread code with high reliability and being hardly affected by fading or the like. The purpose of the present invention is to provide a determination device, a searcher device, and a communication terminal. Disclosure of the invention

The present invention provides a pattern discrimination method in which a correlation value between a signal including any one of n types of function patterns and the function pattern is calculated, and the function pattern included in the signal is identified. Split into lengths and correspondingly The function pattern is divided into predetermined lengths, and a correlation value between the signal and the n types of function patterns is sequentially calculated for each of the divided sections, and the function pattern is determined based on the calculation result. It is characterized by doing so.

According to such a configuration, when calculating a correlation value for a plurality of function patterns, each calculation can be performed in a time-dispersed manner, and the effect of noise or the like that occurs temporarily can be reduced. In a simple configuration without performing parallel processing or the like, the reliability of pattern discrimination against the influence of temporal noise or the like can be improved. The present invention also provides a pattern discriminating apparatus which calculates a correlation value between a signal including any one of n types of function patterns and the function pattern to identify a function pattern included in the signal. a function pattern generator that generates n types of function patterns, a correlator that receives an input signal and a function pattern generated by the function pattern generator, and calculates a correlation value thereof; A controller for switching the n types of function patterns generated by the function pattern generator for each predetermined length of the signal, adjusting a phase, and inputting the phase to the correlator. is there.

According to such a configuration, when calculating a correlation value for a plurality of function patterns, each calculation can be performed in a time-dispersed manner, and the effect of noise or the like that occurs temporarily can be reduced. With a simple configuration without performing parallel processing or the like, it is possible to obtain a pattern discrimination device that can increase the reliability of pattern discrimination against the influence of noise or the like that occurs over time.

In addition, the present invention provides a searcher that synchronizes with a base station when initial synchronization is established, and that identifies the spreading code from a code group including any of the detected n types of spreading codes. An apparatus for calculating a correlation value between a received signal including any of the n types of spreading codes and the n types of spreading codes, and calculating a spreading code included in the signal based on the correlation result. In a searcher device configured to identify the spread code, a spread code generator that generates the n types of spread codes, an input received signal and a spread code generated by the spread code generator are input, and a correlation value of these is input. And the n types of spreading codes generated by the spreading code generator are switched for each predetermined number of symbols of the received signal, and the phase is adjusted and input to the correlator. And a controller for controlling the operation.

According to such a configuration, it is unlikely that the code number is erroneously identified even when the initial synchronization is established due to the influence of fading or the like. Therefore, in a simple configuration without parallel processing or the like, the reliability against fading is improved. And a searcher device that can perform the search.

Further, in the searcher apparatus according to the present invention, the spread code generator is configured by a feedback shift register, and the controller resets an initial value of the feedback shift register, thereby setting the spread code. Switching is performed for each predetermined number of symbols and the phase is adjusted. According to such a configuration, switching of the spreading code for each section length of the received signal can be performed extremely easily. it can.

Further, in the search device according to the present invention, the spread code generator is constituted by a feed-pack shift register, and the controller stops the shift of the feedback shift register over a predetermined number of bits. Thus, the spread code is switched and the phase is adjusted. Even with such a configuration, the spread code can be switched very easily.

The present invention is also a communication terminal including a baseband unit, an RF unit, and an antenna, wherein the baseband unit includes a transmission unit and a reception unit, and the reception unit includes a base station when initial synchronization is established. A searcher device that synchronizes with a station and identifies the spreading code from a code group that includes any of the detected n types of spreading codes, and a received signal that includes any of the n types of spreading codes. A search device that calculates a correlation value with the n types of spreading codes and identifies a spreading code included in the signal based on the correlation result; and the searcher device includes the n types of spreading codes. A spread code generator for generating a spread code, a correlator for receiving the input received signal and the spread code generated by the spread code generator, and calculating a correlation value between them; A controller for switching the n kinds of spread codes generated by the spread code generator for each predetermined number of symbols of the received signal, adjusting a phase, and inputting the phase to the correlator. Things.

According to such a configuration, even when the initial synchronization is established, Thus, it is possible to obtain a communication terminal capable of performing initial synchronization establishment with high reliability against fading in a simple configuration without performing parallel processing or the like, with few errors in code number identification.

Further, in the communication terminal according to the present invention, the communication terminal is a portable terminal, and is excellent in reliability of establishment of initial synchronization and capable of achieving compactness and simplicity essential for carrying. Terminal can be obtained.

Further, the present invention provides a pattern discriminating method for calculating a correlation value between a signal including any one of n types of function patterns and the function pattern to identify a function pattern included in the signal. When a signal including any one of the n types of function patterns and another predetermined signal that occurs periodically are mixed, the signal including any one of the n types of function patterns is used as the other predetermined signal. While periodically removing the period in which the signals are mixed, the signal is divided into predetermined lengths, and the function pattern is correspondingly divided into predetermined lengths, and for each of the divided sections, A correlation value between the signal and the n types of function patterns is sequentially calculated, and the function pattern is determined based on the calculation result.

According to such a configuration, when calculating a correlation value for a plurality of function patterns, each of the calculations can be performed in a time-dispersed manner, and noise such as temporarily generated noise and periodically generated noise can be obtained. The influence can be reduced, and thus the reliability of pattern discrimination against the influence of noise or the like occurring temporally can be increased in a simple configuration without performing parallel processing or the like.

Further, the present invention provides a pattern discriminating apparatus which calculates a correlation value between a signal including any one of n types of function patterns and the function pattern to identify a function pattern included in the signal. A function pattern generator that generates the n types of function patterns, a correlator that receives the input signal and the function pattern generated by the function pattern generator, and calculates a correlation value between them. When another predetermined signal that occurs periodically is mixed with a signal that includes any of the n types of function patterns, the signal that includes any of the n types of function patterns is used as the other predetermined signal. While periodically deleting a period in which signals are mixed, a signal including any one of the n types of function patterns is switched at predetermined intervals and input to the correlator, and the function pattern is And a controller for switching n types of function patterns generated by the generator for each predetermined length of the signal, adjusting a phase, and inputting the phase to the correlator. According to such a configuration, when calculating a correlation value for a plurality of function patterns, each of the calculations can be performed in a time-dispersed manner, and noise such as temporarily generated noise and periodically generated noise can be obtained. Thus, it is possible to obtain a pattern discriminating apparatus which can mitigate the influence and thus can increase the reliability of pattern discrimination against the influence of temporal noise or the like in a simple configuration without performing parallel processing or the like.

Further, the present invention is a searcher apparatus that synchronizes with a base station when initial synchronization is established, and that identifies the spreading code from a code group including any of the detected n types of spreading codes. A calculation unit that calculates a correlation value between a received signal including any of the n types of spreading codes and the n types of spreading codes, and identifies a spreading code included in the signal based on the correlation result. A spreading code generator for generating the n kinds of spreading codes; an input received signal and a spreading code generated by the spreading code generator; And a correlator that calculates any one of the n types of spreading codes, and a signal including any one of the n types of spreading codes, if the other predetermined signal that occurs periodically is mixed, From the signal While periodically deleting a period in which other predetermined signals are mixed, a signal including any one of the n types of spreading codes is switched every predetermined number of symbols and input to the correlator, and the spreading is performed. A controller for switching the n kinds of spread codes generated by the code generator for each predetermined number of symbols of the received signal, adjusting a phase, and inputting the phase to the correlator. .

According to such a configuration, fading at the time of initial synchronization establishment is less likely to cause erroneous identification of a code number even if it is affected by noise or the like due to other channel signals transmitted periodically. With a simple and simple configuration, it is possible to obtain a searcher device that can increase the reliability against fading.

Further, in the searcher device according to the present invention, the spread code generator is configured by a feedback shift register, and the controller resets an initial value of the feedback shift register, thereby setting the spread code to a predetermined value. Switching is performed for each symbol number and the phase is adjusted. According to this configuration, switching of the spreading code for each section length of the received signal can be performed very easily.

Further, in the searcher apparatus according to the present invention, the spread code generator is constituted by a feedback shift register, and the controller shifts an initial setting spread code number of the feedback shift register over a predetermined number of bits. Here, the spread code is switched and the phase is adjusted, and the spread code can be switched very easily even with such a configuration.

In addition, the present invention is a communication terminal including a baseband unit, an RF unit, and an antenna, wherein the baseband unit includes a transmission unit and a reception unit, and the reception unit is a base station when initial synchronization is established. And a searcher device for identifying the spreading code from a code group including any of the detected n types of spreading codes, wherein the received signal includes any of the n types of spreading codes. And a correlation value between the n types of spreading codes and a searcher device configured to identify a diffusion code included in the signal based on a result of the correlation. A spread code generator that generates a spread code of the following, a correlator that receives the input received signal and the spread code generated by the spread code generator, and calculates a correlation value between them; When another predetermined signal that occurs periodically is mixed with a signal that includes any of the n types of spreading codes, the other predetermined signal is converted from the signal that includes any of the n types of spreading codes. While periodically deleting mixed periods, a signal including any of the n types of spread codes is switched every predetermined number of symbols and input to the correlator, and generated by the spread code generator. And a controller for switching the n types of spreading codes for each predetermined number of symbols of the received signal, adjusting the phase, and inputting the adjusted code to the correlator.

According to such a configuration, it is unlikely that the code number is erroneously identified even if it is affected by fusing at the time of initial synchronization and other channel signals that are transmitted periodically. With a simple and simple configuration, it is possible to obtain a communication terminal capable of establishing initial synchronization with improved reliability for faging. Further, in the communication terminal according to the present invention, the communication terminal is a mobile terminal. It is a feature of the present invention, and it is possible to obtain a portable terminal which is excellent in reliability of establishment of initial synchronization and which can achieve small simplicity essential for carrying.

Note that, in the communication terminal according to the present invention, the other predetermined signal periodically generated is a synchronization channel signal at the time of transmission diversity, and is not affected by the synchronization channel signal. For example, it is possible to obtain a mobile terminal used in a DS-CDMA (Direct Spread Code Division Multiple Access) cellular communication system that can establish initial synchronization with high reliability. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a portable terminal according to an embodiment of the present invention. FIG. 2 is a block diagram showing a baseband unit of the mobile terminal.

FIG. 3 is a block diagram showing a configuration of a receiving unit.

FIG. 4 is a block diagram showing a searcher.

FIG. 5 is a diagram showing a received signal.

FIG. 6 is a diagram showing a frame format of CPICH.

FIG. 7 is a block diagram showing a configuration of a code number detection unit.

FIG. 8 is a block diagram showing a register of the spread code generation unit.

FIG. 9 is an explanatory diagram showing a code number detecting operation according to the first embodiment. FIG. 10 is an explanatory diagram showing a code number detecting operation according to the second embodiment. FIG. 11 is a block diagram showing a code number detecting section according to the prior art. FIG. 12 is a diagram showing the operation of the conventional technique.

FIG. 13 is a block diagram showing an example of another conventional technique.

FIG. 14 is a diagram showing the problems of the conventional technology.

FIG. 15 is a diagram showing a configuration of a physical channel in the 3GPP specification. FIG. 16 is a diagram illustrating the operation of transmission diversity.

FIG. 17 is an explanatory diagram showing an example of a received signal (3GPP specification) at the time of transmission diversity.

FIG. 18 is an explanatory diagram showing another example of a received signal at the time of transmission diversity. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described using a portable terminal used in a DS-C DMA cellular system as an example.

Embodiment 1

FIG. 1 is a block diagram showing the overall configuration of the mobile terminal. This mobile terminal is connected to a transmission / reception antenna 1 and a transmission / reception antenna 1, and mixes a transmission baseband signal with a carrier wave and performs quadrature modulation to transmit the signal from the antenna 1. An RF section 2 for obtaining a band signal, and connected to the RF section 2 to spread-modulate the baseband signal and deliver it to the RF section 2 as a transmission baseband signal, or a received baseband signal passed from the RF section 2 The baseband unit 3 that performs despread demodulation and performs error correction processing to obtain a speech codeword, the control unit (CPU) 4 that is connected to the baseband unit 3 and performs various controls, and the baseband unit 3 The audio signal input from the connected microphone is encoded and delivered to the baseband unit 3, or the audio codeword delivered from the baseband unit 3 is converted into an analog audio signal and sent to the speaker. And a speech codec 5 for force.

FIG. 2 is a block diagram showing the baseband unit shown in FIG. 1 in detail. The baseband unit 3 includes a C-DMA modem 30 for performing modulation / demodulation (spreading / despreading), a channel codec 31 for performing error correction and the like, and a DP-RAM (Dual Port RAM) 3 2, 3 3, D / A converter 3 4 that converts digital signals from C DMA modem 30 to analog signals and outputs them to RF section 2, and analog signals from RF section 2 And an AZD converter 35 which converts the digital signal into a digital signal and inputs the digital signal to the C DMA modem 30.

The C-DMA modem 30 receives as input the frame-coded sound code data from the output side of the channel codec 31 via the DP-RAM 32, and uses the data as a transmission baseband signal, as a D / A converter 3 A transmission unit 301 that outputs a transmission signal via a transmission line 4 and a reception baseband signal are input via an AZD converter 35, which despreads the signal and demodulates it into a baseband signal, which is converted to a DP—RAM 3 3 is connected to the channel codec 3 1 via the And a timing generator 304 for forming timing pulses.

FIG. 3 is a detailed block diagram of the receiving unit 302 shown in FIG. 2. The receiving unit 302 includes an AGC 3021 that performs automatic gain control so as to obtain a constant gain, AFC 30 that performs automatic frequency control based on the carrier frequency from the base station

22, a RAKE unit 3023 for demodulating and combining various received signals to obtain received signals, a cell search process for establishing initial synchronization, slot synchronization and frame synchronization, and a spreading code (Searcher device of the present invention) 3024 for detecting a code group of (scramble code) and further detecting a code number from the code group (identifying a spread code), the above-described sequence controller 303 and timing generator 304 And

The RAKE unit 3023 includes a plurality of finger units that perform despreading according to each path.

30231, a RAKE combiner 30232 that combines the baseband signals obtained in the respective finger units, and a radio frame processing circuit 30233 that performs frame processing based on the output of the RAKE combiner.

FIG. 4 is a block diagram showing a searcher in detail, FIG. 5 is a time chart showing slots (Primary-SCH, SecondarySCH) detected by the searcher, and FIG. 6 is used for detecting a spreading code. FIG. 3 is a diagram showing a frame format indicating a CP I CH (common pilot channel). In Fig. 5, (a) shows PCCPCH (Primary Common Control Physical Channel), () shows Primary-SCH (Synchronization Channel), and (c) shows

This shows Secondary-SCH. PCCPCH (BCH) shown in (a) transmits BCH at a fixed rate of 15 ksps (= 30 kbps). The first one symbol (256 ch 0 ps) of each slot is off transmission, and during that period, the Primary-SCH and Secondary-SCH shown in (b) and (c), which are handled by the searcher, are transmitted. .

The Primary-SCH shown in (b) is a channel for initial synchronization (slot synchronization), has 256 chips, and has a code common to all cells. (C) The Secondary-SCH shown in is a channel for group identification, which is a spreading code (scrambling code). Like the Primary-SCH, it has 2 5 6 chips Z slots, but there are 16 types of codes. Yes, this is changed appropriately for each slot, and the combination corresponds to the scramble code group.

The frame shown in FIG. 6 has a fixed length of 10 msec and is divided into 15 slots. In the W—C DMA system, since the signals are spread at a rate of 3.84 Mchip / sec, the number is 384 O chip per frame (256 O chip per slot). In addition, for convenience, CPICH is expressed in units of one symbol with 256 chips, so that ten symbols are stored per slot.

The searcher shown in FIG. 4 has a matched filter section 302 to which a received signal is inputted, a path search section 302 connected to the matched filter section, and a code filter to which the received signal is inputted. It is configured to include a loop detecting section 302 4 3 and a code number detecting section 302 4 4 connected to the code loop detecting section. Both the path information detected by the path search unit and the code number detected by the code number detection unit are input to the sequence controller 303 and used for communication control after the initial synchronization is established. In the above configuration, the searcher first detects the slot timing indicated in the Primary-SCH to establish the initial synchronization. This slot evening is detected by averaging the pulse positions obtained by the matched filter by a path search. When the slot timing is detected, the code group detection unit identifies each pattern (16 types) of each slot (S 1 to S 15) in the Secondary-SCH, and based on the arrangement of these patterns, In addition to synchronizing the frame (detecting the beginning of the frame), it also detects the code (scramble code) group. One code group contains eight types of spreading codes, and when a code group is detected, the code number detector is included in CPICH from among the eight types of spreading codes. Identify code and detect code number.

In the present invention, the identification (determination) of the code number (spreading code) is performed by dividing the signal including the spreading code into a predetermined length and, correspondingly, dividing the spreading code (function pattern) into a predetermined length. And for each of the divided sections, the signal and the eight types Are sequentially calculated, and the spread code is determined based on the calculation result. FIG. 7 is a block diagram showing a configuration of a code number detecting unit according to the present embodiment. In the present embodiment, the code number is detected from the maximum value by performing averaging processing over a period of two frames while sequentially switching the code number (spreading code) every two symbol periods in the slot constituting the CPICH. .

The scramble code number detector shown in FIG. 7 includes a spread code generator 71 that generates a different spread code for every two symbols, and a correlator 72 that calculates a correlation value between the received signal and the spread code. An averaging section 74 for averaging the output of the correlator 72, a switch section 73 for switching the averaging section 74 for every two symbols and connecting to the output of the correlator 72, A code number specifying unit 75 for comparing the correlation level from the output of the averaging unit 74 and specifying a code number based on the output of the averaging unit 74 that outputs the largest value, and a spreading code generating unit 7 1 And a control unit 76 for performing switch control of the switch unit 73 and the like.

FIG. 8 shows a feedback shift register used in the spreading code generation unit 71, and FIG. 9 is an explanatory diagram showing the operation of the code number detection unit. The shift register is composed of two stages, upper and lower, and the values from the predetermined number of elements in the upper and lower shift registers are exclusive-ORed and fed back, and the values from the predetermined number of elements are exclusive logical as appropriate. The sums are taken and output as the Q component spread code.

Hereinafter, the code number detecting operation will be described with reference to FIG. First, processing is started by inputting a code number detection start signal to the control section 76 at the beginning of the frame, and the initial value corresponding to the spreading code number C 1 is set at the beginning of the frame at the spreading code generating section 7. Loaded to 1 and spreading code generation is started. During the period of 2 symbols, the spread code (S (1)) corresponding to the spread code number C1 is continuously generated, and the result of the correlation operation between the generated code and the received signal is the first stage of the averaging circuit 74. Is input to and added Z is accumulated. After the elapse of two symbol periods, the initial value corresponding to the next code number (C 2) is loaded into the spreading code generator at the beginning of the third symbol, and the averaging processing unit 74 is switched to 2 by the switch unit 73. Switch to the stage and perform the correlation Add the calculation result and accumulate Z. Here, the initial value loaded at the beginning of the third symbol is the state of the shift register when two symbols (512 chips) have elapsed from the beginning of the frame of the spreading code sequence corresponding to the code number C2.

Hereinafter, the averaging process is repeated while sequentially switching the code numbers in the same procedure. In the example of FIG. 9, the ninth symbol and the tenth symbol of each slot are not processed. This is because the number of symbols to be detected is eight for the number of symbols per slot, so that the time is adjusted so that the whole detection process can be finished after two well-coordinated frames. It was just because we did it. Note that the code number switching cycle is 2 symbols and the total averaging time is 2 frames. However, it is needless to say that this is merely an example. In this way, by performing processing while switching code numbers in a short cycle, when the entire detection processing is viewed, processing can be performed in a state similar to the parallel processing shown in Fig. 13 and code number detection is performed. Can be.

Here, when the code number is switched, the initial value to be loaded into the spread code generator may be calculated and stored in advance for each code and for each switching timing. Calculating the value and storing it in memory makes the computational effort and the size of the storage circuit not negligible.

For this reason, the embodiment of the present invention employs the following method. In the spreading code system defined by the W—C DMA method, when the spreading code (Primary Scrambling Code) with the code number i = 0 is generated, the spreading code generator is used at the beginning (initial value) of the frame. The shift register pattern is set as follows.

Upper: 000000000000000001

Lower: 1 111 1111 1 11 1 111 1 1 1

When i = 1, the initial value is a state in which only the upper shift register has performed the shift operation 16 times (for 16 chips) from the above state. In other words, it can be considered that the spreading codes corresponding to the code numbers i = 0 to 511 have the phase of the upper shift register shifted by 16 chips. The code numbers included in a certain code group are consecutive numbers such as 0 to 7, 8 to 15,. Therefore, at the code switching timing shown in FIG. 9, it is possible to automatically calculate the initial value for the next code number by performing a shift operation for 16 chips at a time for the upper shift register. Become. In the case of Fig. 9, the detection process is stopped during the ninth and tenth symbol, so when returning from code number C8 to C1, at the appropriate timing during the tenth symbol in the second slot. Only by stopping the shift operation for 16X7 = 112 chips (upper row only), the pattern of C1 is automatically generated. Here, the state after the 16-chip shift can be uniquely calculated for the upper-stage shift register. The calculation method is as follows. Here, assuming that each value (0 or 1) of the upper shift register is a17, a16, a15, -a0, the value after 16-chip shift (bl7, b16, b15, -b 0) can be expressed by the following equation. (+ Is addition of modulo 2)

b l 7 = al 5 + a l l + a4 b l 6 == a l 4 + a l 0 + a3

b 15 = a 13 + a 9 + a3 b l 4 = a l 2 + a8 + a l

b l 3 = a l l + a 7 + a0 b l 2 = a l 7 + a l 0

b l l = a l 6 + a 9 b l 0 = a l 5 + a 8

b 9 = a l4 + a7 b8 = a l 3 + a6

b7 = a l 2 + a 5 b6 = a l l + a4

b 5 = a l 0 + a3 b4 = a 9 + a 2

b3 = a8 + a l b 2 = a 7 + a 0

bb 1l == aa 1177 b 0 = a 16

Therefore, the input of each stage of the upper shift register may be forcibly changed and set in accordance with the above equation at the moment when the code number is switched. However, when actually configuring the circuit, shift once from the state of the code number switching timing (the last chip timing of the even symbol in Fig. 9) (shift to the first chip timing of the next symbol) +16 shifts It is more appropriate to calculate the state after shifting 17 times in total. The state after 17 shifts can be similarly calculated as follows.

b l 7 = a l 6 + a l 2 + a 5 b l 6 = a l 5 + a l l + a4

b l 5 = a l 4 + a l 0 + a4 b 14 = a 13 + a 9 + a 2

b 13 = a 12 + a 8 + a 1 bl 2 = all + a 7 + a0 bll = al 7 + al 0 bl 0 = al 6 + a 9

b9 = a l 5 + a 8 b8 = a l 4 + a7

b 7 = a l 3 + a 6 b6 = a l 2 + a 5

b 5 = a 11 + a 4 b4 = a l 0 + a 3

b 3 = a 9 + a 2 b2 = a8 + a l

b l = a 7 + a 0 b 0 = a 17

Therefore, for example, the input value of each stage of the upper shift register may be switched in accordance with the above equation at the moment when the state of the last chip of the even symbol is shifted to the beginning timing of the next symbol. Should be provided).

As described above, in the first embodiment, the correlation value between the signal including any one of the n types of function patterns and the function pattern is calculated, and when identifying the function pattern included in the signal, the signal is determined by a predetermined value. In addition to dividing the function pattern into lengths, the function pattern is divided into predetermined lengths, and for each of the divided sections, the correlation value between the signal and the n types of function patterns is sequentially calculated. Since the function pattern is determined based on the calculation result, a pattern determination method that is simple and small, is not easily affected by fogging or the like, and can determine a spread code with high reliability. It is possible to provide a pattern discriminating device, a searching device, and a communication terminal. Embodiment 2.

In the first embodiment described above, the received signal is divided into predetermined lengths, the spreading code is correspondingly divided into predetermined lengths, and the received signal is divided into a plurality of types of spread codes for each of the divided sections. The correlation value with the code is sequentially calculated, and the spread code is determined based on the calculation result.

In the second embodiment, when a signal including any one of n types of function patterns in a received signal and another predetermined signal that occurs periodically are mixed, a period in which the other predetermined signal is mixed Is periodically deleted, thereby enabling the spread code to be determined with high reliability even in transmission diversity. Hereafter, before describing the second embodiment, the implementation in transmission diversity will be described. The advantage of the second embodiment will be described.

FIG. 15 is a diagram for explaining the configuration of a physical channel, and is a diagram showing the configuration of a physical channel in the 3GPP (3rd Generatio nPartition Prtne r sipipProject) specification. (1a) shows the signal of the scramble code (Scramb1ngCord) in the CPICH, and (1b) shows the signal of the channelization code (ChannelzionCode) in the CPICH. (1c) shows a signal of a scrambling code in PCCPCH (Primary Common Control Phy sic a lCalChanne 1), and (Id) shows a signal of a channelization code in PCCPCH.

(1e) shows the signal of the channelization code in CH (Synchr on iz ati on Chanel). A normal channel is multiplied by a scramble code and a channelization code, but since SCH has no scramble code, a correlation value can be obtained only by the channelization code.

Next, physical channels in transmission diversity of the 3GPP specification will be described. Transmit diversity is a method of transmitting different signals from different antennas of the same base station (cell). FIG. 16 is a diagram showing the operation of transmission diversity. On the mobile terminal side, since the signals from ANT1 and ΑΝΤ2 are received in a multiplexed form, the signal for each antenna is separated from the received signal and only the necessary signals are extracted. When transmission diversity is used, an antenna-diversity effect can be obtained even with a single mobile terminal antenna. That is, there is a merit that the configuration of the mobile terminal can be simplified.

FIG. 17 is an explanatory diagram showing a received signal (3GPP specification) at the time of transmission diversity. (2a) shows the ANT1 CPICH, (2b) shows the ANT2 CPICH, (2c) shows the ANT1 PCCPCH, (2d) shows the ANT2 PCCPCH, 2e) shows the SCH of ANT1, and (2f) shows the SCH of ANT2. Normal P.CCPCH transmits a pattern with different encoding for each antenna. The SCH switches the transmitting antenna for each slot. In the transmission diversity shown in Fig. 17, special coding (such as bit replacement) is performed in units of two symbols on the transmitting side, and decoding is performed in units of two symbols on the receiving side. Processing is required, and signals transmitted for each antenna are combined, but the first symbol containing SCH transmitted from a different antenna for each slot becomes noise when demodulating CPICH. At this time, if the reception status from each antenna is different, the reception conditions for the scramble code detection using the first symbol and the unused scramble code detection will be different, making it difficult to detect the correct scramble code. . FIG. 18 is an explanatory diagram showing another example of a received signal at the time of transmission diversity. When no signal arrives from ANT 2 as shown in Fig. 18, only the first symbol of the slot receives a different channel than other symbols, and the same first symbol differs for each slot. The first symbol in the slot is noise when viewed from the CPI CH.

Therefore, in the second embodiment, the correlation calculation is performed while excluding the first symbol in each slot, and the second symbol is also excluded during transmission diversity in order to perform decoding processing in units of two symbols. It is like that.

In Embodiment 2, the configurations in FIGS. 1 to 8 described in Embodiment 1 are the same. Hereinafter, the operation of the second embodiment different from that of the first embodiment will be mainly described with reference to FIG.

FIG. 10 illustrates a code number detecting operation according to the second embodiment. First, the process is started by inputting a code number detection start signal to the control unit 76 at the beginning of the frame. Here, the correlation calculation processing is not performed on the first symbol and the second symbol of each slot. Next, an initial value corresponding to the spreading code C 1 is loaded into the spreading code generation unit 71 in accordance with the third symbol, and generation of the spreading code is started. During the period of 2 symbols, the spread code S (1) corresponding to the code number C1 continues to be generated, and the result of the correlation operation between the generated code and the received signal is input to the first stage of the averaging unit 74. Added / accumulated. After the elapse of the period of 2 symbols, the initial value corresponding to the next code number C 2 at the beginning of the 5th symbol is sent to the diffusion code generation unit 71 and averaged by the switch units 7 and 3. The processing unit 74 is switched to the second stage to add / accumulate the correlation calculation result. Here, the initial value loaded at the beginning of the fifth symbol is the shift register value at the time when the spreading code sequence corresponding to the code number C2 has passed for four symbols (10 24 chiρ) from the beginning of the frame. State. Hereinafter, the averaging process is repeated while sequentially switching the code numbers in the same procedure. However, since these operations are the same as those described in the first embodiment, description thereof will be omitted.

As described in detail above, in the second embodiment, when a signal including any one of the n types of function patterns and another predetermined signal that occurs periodically coexist, the n types of functions While periodically removing the period in which the other predetermined signal is mixed from the signal including any of the patterns, the signal is divided into predetermined lengths, and the function pattern is correspondingly divided into predetermined lengths. In each of the divided sections, the correlation value between the signal and the n types of function patterns is sequentially calculated, and the function pattern is determined based on the calculation result. In addition, even when other predetermined signals that occur periodically are mixed, the spread code can be determined with high reliability even when other predetermined signals that occur periodically are mixed. The effect of improving effect becomes higher when the cormorants.

Although the embodiment of the present invention has been described using a mobile terminal of the CDMA communication system as an example, the present invention can be applied to a mobile terminal or a communication system using another system. It goes without saying that the present invention can also be applied to general pattern discrimination under a state where noise is generated with a bias in time. In the second embodiment, the case where the initial value for the spreading code C1 is loaded in accordance with the third symbol is described, but another method may be used. For example, the code corresponding to the one before the spreading code C1 (for example, CO) is loaded as the initial value at the beginning of the frame, and the correlation calculation is not performed during the first to third symbol periods, but the spreading code is not executed. By continuing the shift operation of the generating unit as usual, a spread code sequence similar to that described in the present embodiment can be realized at the start of the third symbol. Industrial applicability

It is possible to provide a pattern discriminating method, a pattern discriminating apparatus, a searcher device, and a communication terminal which are simple and compact, and are not easily affected by fading or the like, and which can discriminate a diffusion code with high reliability. it can.

Claims

The scope of the claims

1. A pattern discriminating method for calculating a correlation value between a signal including any one of n types of function patterns and the function pattern and identifying a function pattern included in the signal.

The signal is divided into predetermined lengths, the function pattern is correspondingly divided into predetermined lengths, and the correlation value between the signal and the n types of function patterns is calculated for each of the divided sections. A pattern discriminating method characterized by sequentially calculating and discriminating the function pattern based on the calculation result.

2.In a pattern discriminating apparatus which calculates a correlation value between a signal including any one of the n types of function patterns and the function pattern, and identifies a function pattern included in the signal.

A function pattern generator that generates the n types of function patterns;

A correlator to which an input signal and a function pattern generated by the function pattern generator are input, and a correlator for calculating a correlation value between them;

A controller for switching the n types of function patterns generated by the function pattern generator for each predetermined length of the signal, adjusting a phase, and inputting the phase to the correlator. Pattern discriminator.

3. A searcher device that synchronizes with a base station when initial synchronization is established and identifies the spreading code from a code group including any of the detected n types of spreading codes, wherein the n types A searcher apparatus that calculates a correlation value between a received signal including any one of the above spreading codes and the n kinds of spreading codes, and identifies a spreading code included in the signal based on the correlation result. ,

A spreading code generator for generating the n kinds of spreading codes;

A correlator that receives the input received signal and the spread code generated by the spread code generator and calculates a correlation value between them;

A controller for switching the n types of spreading codes generated by the spreading code generator for each predetermined number of symbols of the received signal, adjusting a phase, and inputting the phase to the correlator. A featured searcher device.

4. In the searcher device according to claim 3,

The spread code generator includes a feed-pack shift register, and the controller resets an initial value of the feedback shift register to switch the spread code for each predetermined symbol number and adjust a phase. A searcher device characterized in that:

5. The searcher device according to claim 3,

The spreading code generator is configured by a feedback shift register, and the controller stops the shifting of the feedback shift register over a predetermined number of bits, thereby performing switching of the spreading code and phase adjustment. A searcher device characterized by

6. A communication terminal including a baseband unit, an RF unit, and an antenna, wherein the baseband unit includes a transmission unit and a reception unit,

The receiver is a searcher device that synchronizes with a base station when initial synchronization is established, and that identifies the spreading code from a code group including any of the detected n types of spreading codes, wherein the n types A searcher device that calculates a correlation value between a received signal including any one of the spread codes and the n types of spread codes, and identifies a spread code included in the signal based on a result of the correlation.

A spread code generator configured to generate the n types of spread codes;

A correlator to which an input received signal and a spread code generated by the spread code generator are input, and a correlator for calculating a correlation value between them;

A control unit for switching the n types of spreading codes generated by the spreading code generator for each predetermined number of symbols of the received signal, adjusting a phase, and inputting the phase to the correlator. A communication terminal characterized by the above-mentioned.

7. In the communication terminal according to claim 6,

The communication terminal, wherein the communication terminal is a mobile terminal.

8. A pattern discriminating method for calculating a correlation value between a signal including any one of the n types of function patterns and the function pattern and identifying the function pattern included in the signal. When a signal including any of the n types of function patterns and another predetermined signal that occurs periodically are mixed, the signal including any of the n types of function patterns is used as the other predetermined signal. While periodically deleting the period in which the signals are mixed, the signal is divided into predetermined lengths, and the function pattern is correspondingly divided into predetermined lengths. A correlation value between the function pattern and the n types of function patterns is sequentially calculated, and the function pattern is determined based on the calculation result.

9. A pattern discriminating apparatus which calculates a correlation value between a signal including any one of the n types of function patterns and the function pattern, and identifies a function pattern included in the signal.

A function pattern generator that generates the n types of function patterns;

A correlator that receives an input signal and a function pattern generated by the function pattern generator, and calculates a correlation value between these signals;

When another predetermined signal that occurs periodically is mixed with a signal that includes any of the n types of function patterns, the other predetermined signal is generated from the signal that includes any of the n types of function patterns. While periodically removing a period in which signals are mixed, a signal including any of the n types of function patterns is switched at predetermined intervals and input to the correlator, and is generated by the function pattern generator. A controller for switching between n types of function patterns for each predetermined length of the signal, and adjusting the phase to input to the correlator.

10. A searcher device that synchronizes with a base station at the time of initial synchronization establishment and identifies the spreading code from a code group including any of the detected n types of spreading codes, A searcher that calculates a correlation value between a received signal containing any of n kinds of spreading codes and the n kinds of spreading codes, and identifies the spreading code included in the signal based on the correlation result. In the device,

A spreading code generator for generating the n kinds of spreading codes;

A correlator for receiving the input received signal and the spread code generated by the spread code generator, and calculating a correlation value between them;

Other signals periodically generated for signals containing any of the n types of spreading codes When the predetermined signals are mixed, the period including the other predetermined signals is periodically deleted from the signal including any of the n types of spreading codes, while the n types of spreading codes are A signal including any of them is switched every predetermined number of symbols and input to the correlator, and n types of spread codes generated by the spread code generator are switched every predetermined number of symbols of the received signal, and A controller for adjusting a phase and inputting the input to the correlator.

1 1 In the searcher device according to claim 10,

The spreading code generator is constituted by a feedback shift register, and the controller resets an initial value of the feedback shift register, thereby switching the spreading code for each predetermined symbol number, and A searcher device characterized by adjusting the phase.

1 2. In the searcher device according to claim 10,

The spreading code generator is constituted by a feedback shift register. The controller shifts an initial setting spreading code number of the feedback shift register over a predetermined number of bits, thereby switching a spreading code, and a phase. A searcher device that performs adjustment.

1 3. A communication terminal including a baseband unit, an RF unit, and an antenna, wherein the base span unit includes a transmission unit and a reception unit,

The receiver is a search device that synchronizes with a base station when initial synchronization is established and identifies the spread code from a code group including any of the detected n types of spread codes, A correlation value between a received signal including any of the n types of spreading codes and the n types of spreading codes is calculated, and a spreading code included in the signal is identified based on the correlation result. Equipped searcher device,

The searcher device, a spread code generator that generates the n kinds of spread codes,

A correlator for receiving the input received signal and the spread code generated by the spread code generator, and calculating a correlation value between the received signal and the spread code;

When a signal containing any of the n types of spreading codes is mixed with another predetermined signal that is generated periodically, a signal containing any of the n types of spreading codes is used. While periodically deleting the period in which the other predetermined signal is mixed, a signal including any of the n types of spreading codes is switched for each predetermined number of symbols and input to the correlator, and the spreading is performed. A controller for switching the n kinds of spread codes generated by the code generator for each predetermined number of symbols of the received signal, adjusting the phase, and inputting the adjusted code to the correlator. Terminal.

1 4. In the communication terminal described in claim 13,

1 5. In the communication terminal according to claim 13,

The communication terminal according to claim 1, wherein the other predetermined signal periodically generated is a synchronization channel signal at the time of transmission diversity.

Claims of amendment

[January 14, 2001 (14.1.101)] Accepted by the International Bureau: Claims 1, 2, 3, and 6 originally filed have been amended; new claims Ί 6 has been added; other claims remain unchanged. (Page 5)]

1. (After Correction) In a pattern discrimination method in which a correlation value between a signal including any of n types of function patterns and the function pattern is calculated to identify a function pattern included in the signal,

The signal is divided into predetermined lengths, the function pattern is correspondingly divided into predetermined lengths, and the correlation value between the signal and the n types of function patterns is calculated for each of the divided sections. Repeating the step of sequentially calculating and inputting the calculated value to the averaging processing section a predetermined number of times, and determining the function pattern based on the calculation result in the averaging processing section. How to determine.

2. (After correction) In a pattern discriminating apparatus which calculates a correlation value between a signal including any one of n kinds of function patterns and the function pattern to identify a function pattern included in the signal,

A function pattern generator that generates the n types of function patterns;

Means for switching the n kinds of function patterns generated by the function pattern generator for each predetermined length of the signal, adjusting a phase, and inputting the phase to the correlator; A controller that controls so as to repeat the operation of sequentially switching the patterns one by one a predetermined number of times, and an averaging processing unit that receives the correlation value calculated by the correlator and performs averaging processing for each function pattern A pass-through discriminating device comprising:

3. (After Correction) A searcher device which synchronizes with a base station when initial synchronization is established and identifies the spreading code from a code group including any of the detected n types of spreading codes, A searcher that calculates a correlation value between a received signal including any of the n types of spreading codes and the n types of spreading codes, and identifies a spreading code included in the signal based on the correlation result. In the device,

A spreading code generator for generating the n kinds of spreading codes;

The input received signal and the spread code generated by the spread code generator are input.

twenty four

Amended paper (Article 19 of the Convention) A correlator for calculating these correlation values,

Means for switching the n kinds of spreading codes generated by the spreading code generator for each predetermined symbol number of the received signal, adjusting a phase, and inputting the phase to the correlator, wherein the n kinds of spreading codes are provided. A controller that controls an operation of sequentially switching codes one by one a predetermined number of times, and an averaging processing unit that receives a correlation value calculated by the correlator and performs an averaging process for each spread code. A searcher device comprising:

4. In the searcher device according to claim 3,

The spreading code generator includes a feedback shift register. The controller resets an initial value of the feedback shift register to switch the spreading code for each predetermined number of symbols, and A searcher device characterized by adjusting the following.

5. The searcher device according to claim 3,

The spread code generator is configured by a feedback shift register, and the controller stops the shift of the feedback shift register over a predetermined number of bits, thereby performing switching of a spread code and phase adjustment. A searcher device characterized by performing.

6. (After correction) A communication terminal having a baseband unit, an RF unit, and an antenna,

The baseband unit includes a transmission unit and a reception unit,

4. A communication terminal comprising the searcher device according to claim 3 as the search device.

7. In the communication terminal according to claim 6,

twenty five

Corrected form (Article 19 of the Convention)

8. A pattern discriminating method for calculating a correlation value between a signal including any one of n types of function patterns and the function pattern and identifying a function pattern included in the signal.

When a signal including any of the n types of function patterns and another predetermined signal that occurs periodically are mixed, the signal including any of the n types of function patterns is used as the other predetermined signal. While periodically deleting the period in which the signals are mixed, the signal is divided into predetermined lengths, and the function pattern is correspondingly divided into predetermined lengths. A correlation value between the function pattern and the n types of function patterns is sequentially calculated, and the function pattern is determined based on the calculation result.

9.A pattern discriminating apparatus which calculates a correlation value between a signal including any one of the n types of function patterns and the function pattern and identifies the function pattern included in the signal.

A function pattern generator that generates the n types of function patterns;

10. A searcher device that synchronizes with a base station when initial synchronization is established and identifies the spreading code from a code group including any of the detected n types of spreading codes, wherein the n types A searcher device that calculates a correlation value between a received signal including any one of the above spreading codes and the n types of spreading codes, and identifies a spreading code included in the signal based on the correlation result.

A spreading code generator for generating the n kinds of spreading codes;

26

Amended paper (Article 19 of the Convention) A correlator for receiving the input received signal and the spread code generated by the spread code generator, and calculating a correlation value between the received signal and the spread code;

When another predetermined signal periodically generated is mixed with a signal including any of the n types of spreading codes, the other predetermined signal is converted from the signal including any of the n types of spreading codes. While periodically deleting a period in which signals are mixed, a signal including any of the n types of spreading codes is switched every predetermined number of symbols and input to the correlator, and generated by the spreading code generator. A searcher, comprising: a controller that switches n types of spread codes for each predetermined number of symbols of the received signal, adjusts a phase, and inputs the adjusted code to the correlator.

1 1 In the searcher device according to claim 10,

The spread code generator includes a feedback shift register, and the controller resets an initial value of the feedback shift register to switch the spread code for each predetermined symbol number, and to change a phase. A searcher device characterized by adjustment.

12. The searcher device according to claim 10, wherein

The spreading code generator is constituted by a feedback shift register. The controller shifts an initial setting spreading code number of the feed pack shift register over a predetermined number of bits, thereby switching a spreading code, and A searcher device for performing phase adjustment.

13. A communication terminal including a baseband unit, an RF unit, and an antenna, wherein the baseband unit includes a transmission unit and a reception unit,

The receiver is a searcher device that synchronizes with the base station when initial synchronization is established and identifies the spreading code from a code group including any of the detected n types of spreading codes. And calculating a correlation value between the received signal including any of the n types of spreading codes and the n types of spreading codes, and identifying the spreading code included in the signal based on the correlation result. Equipped with one device,

The searcher device, a spread code generator for generating the n kinds of spread codes,

When another predetermined signal periodically generated is mixed with a signal including any of the n types of spreading codes, the other predetermined signal is converted from the signal including any of the n types of spreading codes. While periodically deleting a period in which signals are mixed, a signal including any of the n types of spreading codes is switched every predetermined number of symbols and input to the correlator, and generated by the spreading code generator. A communication terminal, comprising: a controller that switches n types of spreading codes for each predetermined symbol number of the received signal, adjusts a phase, and inputs the adjusted signal to the correlator.

1 4. In the communication terminal described in claim 13,

15. In the communication terminal according to claim 13,

16. (Addition) In the searcher device described in claim 4,

The controller, as means for resetting the initial value of the feedback shift register constituting the spreading code generator, includes a shift operation when a predetermined number of K clocks are applied to the feedback shift register. A searcher apparatus comprising: means for obtaining an initial value using a feedback shift register configured to realize an operation by one clock application, and resetting the initial value.

, '8

Amended paper (Article 19 of the Convention) Description based on Article 19 of the Convention The amendment of claim 1 is a controller that repeats the operation of sequentially switching n types of patterns one by one a predetermined number of times, and a correlation value calculated by a correlator is input. Clarified that the system has an averaging unit that averages function patterns.

In Japanese Patent Application Laid-Open No. H10-2004 / 47 (hereinafter referred to as Reference 1), in discriminating n types of long codes (function patterns), a spread code sequence is divided into intercepts and sequentially input to a multi-pass filter. A method is disclosed in which the correlation between a signal and a function pattern is obtained by changing the relationship between the two. The method disclosed in Japanese Patent Application Laid-Open No. H11-2016 (hereinafter referred to as Reference 2) is limited to matched filters. Instead, as in Reference 1, a method is proposed in which the signal is divided into predetermined intercepts, the long code is sequentially changed, the correlation is obtained, and the long code is determined from the correlation output. In Bow 1 Example 2, the averaging process is further taken into account. In either method, the code pattern is sequentially changed to determine the long code when the correlation value exceeds the threshold value.Therefore, the correlation calculation period of the corresponding long code and the fading due to fading are used. If the period during which the received signal level decreases coincides with the threshold, the threshold value may not be exceeded and discrimination may not be possible. In the invention described in claim 1, such a problem can be solved because the repetitive processing is performed.

In the correction according to claim 2, the n kinds of function patterns generated by the function pattern generator are switched for each predetermined length of the signal, and the phase is adjusted and input to the calculator. A controller for controlling the operation of sequentially switching the n types of patterns one by one by a predetermined number of times; and a correlation value calculated by the correlator being input, and averaging processing for each function pattern. It is clarified that an averaging processing unit for performing this is provided.

As a result, similarly to the case of claim 1, the difference from the bow W row becomes clear. The correction according to claim 3, wherein the n kinds of spread codes generated by the spread code generator are switched for each predetermined number of symbols of the received signal, and the phase is adjusted and input to the correlator. And sequentially switch the n kinds of diffusion codes one by one It is evident that the control device includes a controller for controlling the operation to repeat the predetermined operation a predetermined number of times, and an averaging processing unit that receives the correlation value calculated by the correlator and performs averaging processing for each spreading code. Again, as in claim 1, the bow (the difference from the example is clear).

The amendment set forth in claim 6 clarifies that the searcher device provided here is the same as the searcher device set forth in claim 3. As in paragraph 1, the differences from the references are clarified.

The amendment in claim 16 is a claim related to addition, and in addition to the configuration in claim 3, a field constituting a spreading code generator is included.

Means for resetting the initial value of.